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  Subjects -> COMPUTER SCIENCE (Total: 1969 journals)
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COMPUTER SCIENCE (1147 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 872 Journals sorted alphabetically
3D Printing and Additive Manufacturing     Full-text available via subscription   (Followers: 11)
Abakós     Open Access   (Followers: 3)
Academy of Information and Management Sciences Journal     Full-text available via subscription   (Followers: 67)
ACM Computing Surveys     Hybrid Journal   (Followers: 23)
ACM Journal on Computing and Cultural Heritage     Hybrid Journal   (Followers: 8)
ACM Journal on Emerging Technologies in Computing Systems     Hybrid Journal   (Followers: 13)
ACM Transactions on Accessible Computing (TACCESS)     Hybrid Journal   (Followers: 4)
ACM Transactions on Algorithms (TALG)     Hybrid Journal   (Followers: 16)
ACM Transactions on Applied Perception (TAP)     Hybrid Journal   (Followers: 6)
ACM Transactions on Architecture and Code Optimization (TACO)     Hybrid Journal   (Followers: 9)
ACM Transactions on Autonomous and Adaptive Systems (TAAS)     Hybrid Journal   (Followers: 7)
ACM Transactions on Computation Theory (TOCT)     Hybrid Journal   (Followers: 11)
ACM Transactions on Computational Logic (TOCL)     Hybrid Journal   (Followers: 4)
ACM Transactions on Computer Systems (TOCS)     Hybrid Journal   (Followers: 18)
ACM Transactions on Computer-Human Interaction     Hybrid Journal   (Followers: 12)
ACM Transactions on Computing Education (TOCE)     Hybrid Journal   (Followers: 3)
ACM Transactions on Design Automation of Electronic Systems (TODAES)     Hybrid Journal   (Followers: 1)
ACM Transactions on Economics and Computation     Hybrid Journal  
ACM Transactions on Embedded Computing Systems (TECS)     Hybrid Journal   (Followers: 4)
ACM Transactions on Information Systems (TOIS)     Hybrid Journal   (Followers: 19)
ACM Transactions on Intelligent Systems and Technology (TIST)     Hybrid Journal   (Followers: 9)
ACM Transactions on Interactive Intelligent Systems (TiiS)     Hybrid Journal   (Followers: 4)
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)     Hybrid Journal   (Followers: 10)
ACM Transactions on Reconfigurable Technology and Systems (TRETS)     Hybrid Journal   (Followers: 7)
ACM Transactions on Sensor Networks (TOSN)     Hybrid Journal   (Followers: 8)
ACM Transactions on Speech and Language Processing (TSLP)     Hybrid Journal   (Followers: 10)
ACM Transactions on Storage     Hybrid Journal  
ACS Applied Materials & Interfaces     Full-text available via subscription   (Followers: 21)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Ad Hoc Networks     Hybrid Journal   (Followers: 11)
Adaptive Behavior     Hybrid Journal   (Followers: 10)
Advanced Engineering Materials     Hybrid Journal   (Followers: 24)
Advanced Science Letters     Full-text available via subscription   (Followers: 5)
Advances in Adaptive Data Analysis     Hybrid Journal   (Followers: 8)
Advances in Artificial Intelligence     Open Access   (Followers: 14)
Advances in Artificial Neural Systems     Open Access   (Followers: 4)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 15)
Advances in Computer Science : an International Journal     Open Access   (Followers: 13)
Advances in Computing     Open Access   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 53)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 9)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Human-Computer Interaction     Open Access   (Followers: 19)
Advances in Materials Sciences     Open Access   (Followers: 16)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 35)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Advances in Technology Innovation     Open Access  
AEU - International Journal of Electronics and Communications     Hybrid Journal   (Followers: 8)
African Journal of Information and Communication     Open Access   (Followers: 6)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 4)
Air, Soil & Water Research     Open Access   (Followers: 7)
AIS Transactions on Human-Computer Interaction     Open Access   (Followers: 6)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1)
Algorithms     Open Access   (Followers: 9)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 3)
American Journal of Computational Mathematics     Open Access   (Followers: 4)
American Journal of Information Systems     Open Access   (Followers: 6)
American Journal of Sensor Technology     Open Access   (Followers: 2)
Anais da Academia Brasileira de Ciências     Open Access   (Followers: 2)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 5)
Analysis in Theory and Applications     Hybrid Journal  
Animation Practice, Process & Production     Hybrid Journal   (Followers: 5)
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Data Science     Hybrid Journal   (Followers: 8)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 6)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Software Engineering     Hybrid Journal   (Followers: 12)
Annual Reviews in Control     Hybrid Journal   (Followers: 6)
Anuario Americanista Europeo     Open Access  
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applied and Computational Harmonic Analysis     Full-text available via subscription   (Followers: 2)
Applied Artificial Intelligence: An International Journal     Hybrid Journal   (Followers: 13)
Applied Categorical Structures     Hybrid Journal   (Followers: 2)
Applied Clinical Informatics     Hybrid Journal   (Followers: 1)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Computer Systems     Open Access   (Followers: 1)
Applied Informatics     Open Access  
Applied Mathematics and Computation     Hybrid Journal   (Followers: 31)
Applied Medical Informatics     Open Access   (Followers: 9)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Soft Computing     Hybrid Journal   (Followers: 16)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Architectural Theory Review     Hybrid Journal   (Followers: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 4)
Archive of Numerical Software     Open Access  
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Artifact     Hybrid Journal   (Followers: 2)
Artificial Life     Hybrid Journal   (Followers: 5)
Asia Pacific Journal on Computational Engineering     Open Access  
Asia-Pacific Journal of Information Technology and Multimedia     Open Access   (Followers: 1)
Asian Journal of Computer Science and Information Technology     Open Access  
Asian Journal of Control     Hybrid Journal  
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
Australian Educational Computing     Open Access  
Automatic Control and Computer Sciences     Hybrid Journal   (Followers: 3)
Automatic Documentation and Mathematical Linguistics     Hybrid Journal   (Followers: 5)
Automatica     Hybrid Journal   (Followers: 8)
Automation in Construction     Hybrid Journal   (Followers: 6)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 7)
Basin Research     Hybrid Journal   (Followers: 3)
Behaviour & Information Technology     Hybrid Journal   (Followers: 52)
Bioinformatics     Hybrid Journal   (Followers: 231)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
Briefings in Bioinformatics     Hybrid Journal   (Followers: 45)
British Journal of Educational Technology     Hybrid Journal   (Followers: 117)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
c't Magazin fuer Computertechnik     Full-text available via subscription   (Followers: 1)
CALCOLO     Hybrid Journal  
Calphad     Hybrid Journal  
Canadian Journal of Electrical and Computer Engineering     Full-text available via subscription   (Followers: 12)
Catalysis in Industry     Hybrid Journal   (Followers: 1)
CEAS Space Journal     Hybrid Journal  
Cell Communication and Signaling     Open Access   (Followers: 1)
Central European Journal of Computer Science     Hybrid Journal   (Followers: 5)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
ChemSusChem     Hybrid Journal   (Followers: 7)
China Communications     Full-text available via subscription   (Followers: 7)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
CIN Computers Informatics Nursing     Full-text available via subscription   (Followers: 12)
Circuits and Systems     Open Access   (Followers: 13)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
CLEI Electronic Journal     Open Access  
Clin-Alert     Hybrid Journal   (Followers: 1)
Cluster Computing     Hybrid Journal   (Followers: 1)
Cognitive Computation     Hybrid Journal   (Followers: 4)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Communication Methods and Measures     Hybrid Journal   (Followers: 11)
Communication Theory     Hybrid Journal   (Followers: 18)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Algebra     Hybrid Journal   (Followers: 3)
Communications in Partial Differential Equations     Hybrid Journal   (Followers: 3)
Communications of the ACM     Full-text available via subscription   (Followers: 47)
Communications of the Association for Information Systems     Open Access   (Followers: 18)
COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering     Hybrid Journal   (Followers: 3)
Complex & Intelligent Systems     Open Access  
Complex Adaptive Systems Modeling     Open Access  
Complex Analysis and Operator Theory     Hybrid Journal   (Followers: 2)
Complexity     Hybrid Journal   (Followers: 6)
Complexus     Full-text available via subscription  
Composite Materials Series     Full-text available via subscription   (Followers: 9)
Computación y Sistemas     Open Access  
Computation     Open Access  
Computational and Applied Mathematics     Hybrid Journal   (Followers: 2)
Computational and Mathematical Methods in Medicine     Open Access   (Followers: 2)
Computational and Mathematical Organization Theory     Hybrid Journal   (Followers: 2)
Computational and Structural Biotechnology Journal     Open Access   (Followers: 2)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Astrophysics and Cosmology     Open Access  
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computational Cognitive Science     Open Access   (Followers: 1)
Computational Complexity     Hybrid Journal   (Followers: 4)
Computational Condensed Matter     Open Access  
Computational Ecology and Software     Open Access   (Followers: 8)
Computational Economics     Hybrid Journal   (Followers: 9)
Computational Geosciences     Hybrid Journal   (Followers: 12)
Computational Linguistics     Open Access   (Followers: 23)
Computational Management Science     Hybrid Journal  
Computational Mathematics and Modeling     Hybrid Journal   (Followers: 8)
Computational Mechanics     Hybrid Journal   (Followers: 4)
Computational Methods and Function Theory     Hybrid Journal  
Computational Molecular Bioscience     Open Access   (Followers: 2)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Particle Mechanics     Hybrid Journal   (Followers: 1)
Computational Research     Open Access   (Followers: 1)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computational Science and Techniques     Open Access  
Computational Statistics     Hybrid Journal   (Followers: 13)
Computational Statistics & Data Analysis     Hybrid Journal   (Followers: 27)
Computer     Full-text available via subscription   (Followers: 78)
Computer Aided Surgery     Hybrid Journal   (Followers: 3)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Communications     Hybrid Journal   (Followers: 10)
Computer Engineering and Applications Journal     Open Access   (Followers: 5)
Computer Journal     Hybrid Journal   (Followers: 8)
Computer Methods in Applied Mechanics and Engineering     Hybrid Journal   (Followers: 22)
Computer Methods in Biomechanics and Biomedical Engineering     Hybrid Journal   (Followers: 10)
Computer Methods in the Geosciences     Full-text available via subscription   (Followers: 1)
Computer Music Journal     Hybrid Journal   (Followers: 13)
Computer Physics Communications     Hybrid Journal   (Followers: 6)
Computer Science - Research and Development     Hybrid Journal   (Followers: 7)
Computer Science and Engineering     Open Access   (Followers: 17)
Computer Science and Information Technology     Open Access   (Followers: 10)
Computer Science Education     Hybrid Journal   (Followers: 12)
Computer Science Journal     Open Access   (Followers: 20)
Computer Science Master Research     Open Access   (Followers: 9)
Computer Science Review     Hybrid Journal   (Followers: 10)

        1 2 3 4 5 6 | Last

Journal Cover Assembly Automation
  [SJR: 0.657]   [H-I: 26]   [2 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0144-5154
   Published by Emerald Homepage  [335 journals]
  • Editorial for Special Section on Functionally Graded Rapid Prototyping, 4D
           Printing & Self-Assemblies
    • First page: 145
      Abstract: Assembly Automation, Volume 37, Issue 2, April 2017.

      Citation: Assembly Automation
      PubDate: 2017-02-22T12:11:30Z
      DOI: 10.1108/AA-02-2017-016
       
  • A Study of 4D Printing and Functionally Graded Additive Manufacturing
    • First page: 147
      Abstract: Assembly Automation, Volume 37, Issue 2, April 2017.
      Purpose The purpose of this paper is to extend existing knowledge of 4D printing, in line with Khoo et al. (2015) who defined the production of 4D printing with single material; and 4D printing of multiple materials. We propose that 4D printing can be achieved through the use of Functionally Graded Materials, where materials are gradationally mixed and produced using an AM technique to achieve a single component. Design/methodology/approach We extensively reviewed the latest state of art literature review, covering aspects of materials, processes, CAD, applications and made recommendations for future work. Findings This paper clarifies that Functionally Graded Additive Manufacturing (FGAM) is defined as a single additive manufacturing process that includes the gradational mixing of materials to fabricate freeform geometries with variable-properties within one component. The paper also covers aspects of materials, processes, CAD, applications and made recommendations for future work. Research limitations/implications This paper has examined the relationship between FGAM and 4D printing and defines Functionally Graded Additive Manufacturing (FGAM) as a single AM process that includes the gradationally mixing of materials to fabricate freeform geometries with variable-property within one component. FGAM requires better computational tools for modelling, simulation and fabrication as current CAD systems are incapable of supporting the FGAM workflow. Practical implications We also identified that other factors such as strength, type of materials, etc. must be taken into account when selecting an appropriate process for FGAM. More research needs to be conducted on improving the performance of FGAM processes through extensive characterization of functionally graded materials (FGMs) to generate a comprehensive database and to develop a predictive model for proper process control. It is expected that future work will focus on both material characterization as well as seamless FGAM control processes. Originality/value This paper has examined the relationship between FGAM and 4D printing and defines Functionally Graded Additive Manufacturing (FGAM) as a single AM process that includes the gradationally mixing of materials to fabricate freeform geometries with variable-property within one component.
      Citation: Assembly Automation
      PubDate: 2017-02-22T12:11:09Z
      DOI: 10.1108/AA-01-2017-012
       
  • Investigating the friction coefficient in functionally graded rapid
           prototyping of Al-Al2O3 composite prepared by fused deposition modelling
    • First page: 154
      Abstract: Assembly Automation, Volume 37, Issue 2, April 2017.
      Purpose The present research work is aimed to study the friction coefficient in functionally graded rapid prototyping of Al-Al2O3 composite prepared via fused deposition modelling (FDM) assisted investment casting (IC) process. The optimized settings of the process parameters (namely: filament proportion, volume of FDM pattern, density of FDM pattern, barrel finishing time, barrel finishing media weight and number of IC slurry layers) suggested in the present research work will help to fabricate parts possessing higher frictional coefficient. Design/methodology/approach Initially, melt flow index (MFI) of two different proportions of Nylon6-Al-Al2O3 (to be used as an alternative FDM filament material) were tested on melt flow indexer and matched with MFI of commercially used Acrylonitrile-Butadiene-Styrene (ABS) filament. After this the selected proportions of Nylon6-Al-Al2O3 were prepared in form of FDM filament by using a single screw extruder. Further, this FDM filament has been used for developing sacrificial IC patterns in the existing FDM system which was barely finished to improve their surface finish. Castings developed were tested for their wear resistance properties on pin-on-disc type tribo-tester under dry condition at sliding conditions in order to check their suitability as frictional device for industrial applications. In the methodology part, Taguchi L18 orthogonal array (OA) was used to study the effect of selected process variables on coefficient of friction (µ). Findings It has been found that filament proportion, volume of FDM pattern and density of FDM pattern has significantly affected the µ-values. Further density of FDM pattern found to have 91.62% contribution in obtaining µ-values. Scanning electron micrographs highlighted uniform distribution of Al2O3 particles in the Al - matrix at suggested optimized settings. Practical implications The present methodology illustrates the development of a functional graded material, consisted of surface reinforcement with Al2O3 particles, which could have applications for manufacturing friction surfaces such as: clutch plates, brake drum, etc. Originality/value This paper describes the effect of process parameters on wear properties of Al-Al2O3 composite developed as a functionally graded material by the FDM based pattern in IC process.
      Citation: Assembly Automation
      PubDate: 2017-02-22T12:11:16Z
      DOI: 10.1108/AA-06-2016-055
       
  • Method for characterization and enhancement of 3D printing by binder
           jetting applied to the textures quality
    • First page: 162
      Abstract: Assembly Automation, Volume 37, Issue 2, April 2017.
      Purpose This paper aims to present a technical approach to evaluate the quality of textures got by inkjet during the binder jetting in 3D printing on powder bed through contours detection in order to improve the quality of surface printed according to the result of the assembly between inkjet and granular product. Design/methodology/approach The manufacturing process is based on use of Computer Aided Design and a 3D Printer by binder jetting. Image processing measures the edge deviation of texture on granular surface with the possibility to implement a correction in active assembly through a Design For Manufacturing approach. Example application is presented through first tests. Findings This approach observes a shape alteration of the printed image on 3D printed product, the work used the image processing method to improve the model according to the Design For Manufacturing approach. Originality/value The paper introduces a solution to improve the texture quality on the 3D printed product realized by binder jetting. The Design For Manufacturing approach proposes an active assembly by compensating the print errors in upstream of product life cycle.
      Citation: Assembly Automation
      PubDate: 2017-02-22T12:10:59Z
      DOI: 10.1108/AA-01-2016-007
       
  • Intelligent Materials: A Review of Applications in 4D Printing
    • First page: 170
      Abstract: Assembly Automation, Volume 37, Issue 2, April 2017.
      Purpose The paper aims to promote the development of intelligent materials and the 4D printing technology by introducing the recent advances and applications of ALM technology of intelligent materials and the development of the 4D Printing technology. Also, an arm type ALM technology of shape memory polymer with thermosetting polyurethane is briefly introduced. Design/methodology/approach This paper begins with an overview of the development and applications of intelligent materials around the world as well as the 4D printing technology. Then, the authors provide a brief outline of their research on arm type ALM technology of shape memory polymer with thermosetting polyurethane. Findings The paper provides the recent development and applications of intelligent materials and 4D printing technology. Then, it is suggested that intelligent materials mixed with different functional materials will be developed, and these sorts of materials will be more suitable for 4D printing. Originality/value This paper overviews the current development and applications of intelligent materials and its use in 4D printing technology, and briefly states the authors' research on arm type ALM technology of shape memory polymer with thermosetting polyurethane.
      Citation: Assembly Automation
      PubDate: 2017-02-22T12:11:12Z
      DOI: 10.1108/AA-11-2015-093
       
  • How to achieve precise operation of a robotic manipulator on a macro to
           micro/nano scale
    • First page: 186
      Abstract: Assembly Automation, Volume 37, Issue 2, April 2017.
      Purpose The purpose of this paper is to present state-of-the-art approaches to precise operation of a robotic manipulator on a macro to micro/nano scale. Design/methodology/approach In this paper, we first briefly discussed fundamental issues associated with precise operation of a robotic manipulator on a macro to micro/nano scale. Second, we described and compared the characteristics of basic components (i.e. mechanical parts, actuators, sensors and control algorithm) of the robotic manipulator. Specifically, we classified and analyzed commonly used mechanisms of the manipulator. We also explained and compared in details intuitive meaning and applications of its actuator. Moreover, related researches on general control algorithm and visual control employed in robotic manipulator to achieve precise operation have also been discussed. Findings Remarkable achievements in dexterous mechanical design, excellent actuators, accurate perception, optimized control method, etc., have been made in precise operation of a robotic manipulator. Precise operation is critical for dealing with objects which need to be manufactured, modified, and assembled. The operational accuracy is directly affected by the performance of mechanical design, actuators, sensors and control algorithms. Therefore, this paper provides a categorization showing the fundamental concepts and applications of these characteristics. Originality/value This paper presents a categorization of mechanical design, actuators, sensors and control algorithms of robotic manipulators in macro to micro/nano field for precise operation.
      Citation: Assembly Automation
      PubDate: 2017-02-22T12:11:32Z
      DOI: 10.1108/AA-02-2017-017
       
  • Force Control for a Rigid Dual Peg-in-Hole Assembly
    • First page: 200
      Abstract: Assembly Automation, Volume 37, Issue 2, April 2017.
      Purpose This paper aims to realize the automatic assembly process for multiple rigid peg-in-hole components. Design/methodology/approach We develop fuzzy force control strategies for the rigid dual peg-in-hole assembly. Firstly, the fuzzy force control strategies are presented. Secondly, the contact states and contact forces are analyzed to prove the availability of the force control strategies. Findings The rigid dual peg-in-hole assembly experimental results show the effectiveness of the control strategies. Originality/value We propose fuzzy force control strategies for a rigid dual peg-in-hole assembly task.
      Citation: Assembly Automation
      PubDate: 2017-02-22T12:10:51Z
      DOI: 10.1108/AA-09-2016-120
       
  • key assembly structure identification in complex mechanical assembly based
           on multi-source information
    • First page: 208
      Abstract: Assembly Automation, Volume 37, Issue 2, April 2017.
      Purpose Three-dimensional model reuse plays an increasingly important role in complex product design and innovative design. Assembly model has become important resource of models reuse in enterprises, which contains certain function assembly structures. These assembly structures implicating plenty of design intent and design experience knowledge can be used to support function-structure design, modular design reuse and semantic analysis for complex product. Thus, the purpose of this paper is to find a method for key assembly structure identification in complex mechanical assembly. Design/methodology/approach A method for identifying key assembly structures in assembly model is presented from the viewpoint of assembly topology and multi-source attributes. First, assembly model is represented based on complex network. Then, a two-level evaluation model is put forward to evaluate importance of parts assembled, and the key function parts in assembly can be obtained. After that, on the basis of the function parts, a heuristic algorithm upon breadth first searching is given to identify key assembly structures. Findings The method could be used to evaluate key function parts and identify key assembly structures in complex mechanical assembly according to the specific circumstances. Practical implications The method can not only help designers find the key assembly structure in complex mechanical assembly model, facilitate the function-structure designing and semantic analyzing and thereby improve the efficiency of product knowledge reuse, but also assist in analyzing influence scope of key function part changing and optimization of the assembly process for complex mechanical assembly. Originality/value The paper is the first to propose a method for key assembly structure identification in complex mechanical assembly, where the key function parts can be evaluated through a two-level evaluation model, and the key assembly structures are identified automatically based on complex network.
      Citation: Assembly Automation
      PubDate: 2017-02-22T12:10:55Z
      DOI: 10.1108/AA-09-2016-121
       
  • Real-time 3D Work-piece Tracking with Mo-nocular Camera Based on Static
           and Dynamic Model Libraries
    • First page: 219
      Abstract: Assembly Automation, Volume 37, Issue 2, April 2017.
      Purpose Tracking of 3D work-pieces with real-time speed is be-coming more and more important for some industrial tasks, such as work-pieces grasping and assembly, especially in complex environment. This paper proposed a novel real-time 3D model-based work-piece tracking method with monocular camera for high precision assembly. Design/methodology/approach A three-step process method was provided, i.e., the of-fline static global library generation process, the online dynamic local library updating and selection process, and the 3D work-piece localization process. In the offline static global library generation process, the CAD models of the work-piece are used to generate a set of discrete 2D hierarchical views matching libraries. In the online dynamic library updating and selection process, the previous 3D location information of the work-piece is used to predict the following location range, and a discrete matching library with a small number of 2D hier-archical views is selected from dynamic local library for localization. Then, the work-piece is localized with high-precision and real time speed in the 3D work-piece localization process. Findings The method is suitable for the texture-less work-pieces in industrial applications. Originality/value The small range of the library enables a real-time matching. Experimental results demonstrate the high accuracy and high efficiency of the proposed method.
      Citation: Assembly Automation
      PubDate: 2017-02-22T12:11:25Z
      DOI: 10.1108/AA-02-2017-018
       
  • A vision-based character inspection system for tire mold
    • First page: 230
      Abstract: Assembly Automation, Volume 37, Issue 2, April 2017.
      Purpose This paper aims to design an automatic inspection system for the characters on the tire mold, which involves a vision-based inspection method for the characters on the tire mold. Design/methodology/approach An automatic inspection equipment is designed according to the features of the tire mold. To implement the inspection task, the corresponding image processing methods are designed, including image preprocessing, image mosaic, image locating and character inspection. Image preprocessing mainly contains fitting the contours of the acquired tire mold images and those of the CAD as the arcs of two circles and polar transformation of the acquired images and the CAD. Then, we propose a novel framework to locate the acquired images into the corresponding mosaicked tire mold image. Finally, a character inspection scheme is proposed by combining a SVM-based character recognition method and a string matching approach. At the stages of image locating and character inspection, image mosaic is simultaneously employed to label the defects in the mosaicked tire mold image, which is based on histograms-of-gradients (HOG) features. Findings The experimental results indicate that the designed automatic inspection system can inspect the characters on the tire mold with a high accuracy at a reasonable consuming time. Practical implications The designed automatic inspection system can detect the carving faults for the characters on the tire molds, which are the cases that the characters are wrongly added, deleted, or modified on the tire mold. Originality/value To the best of our knowledge, this is the first automatic vision-based inspection system for the characters on the tire mold. An inspection equipment is designed and many novel image processing methods are proposed to implement the inspection task. The designed system can be widely applied in the industry.
      Citation: Assembly Automation
      PubDate: 2017-02-22T12:11:04Z
      DOI: 10.1108/AA-07-2016-066
       
  • A Hybrid Ant-Wolf Algorithm to Optimize Assembly Sequence Planning Problem
    • First page: 238
      Abstract: Assembly Automation, Volume 37, Issue 2, April 2017.
      Purpose This paper optimizes the Assembly Sequence Planning problem using a proposed hybrid algorithm based on Ant Colony Optimization (ACO) and Grey Wolf Optimizer (GWO). The proposed Hybrid Ant-Wolf Algorithm (HAWA) is designed to overcome premature convergence in ACO. Design/methodology/approach The Assembly Sequence Planning (ASP) problem is formulated by using task-based representation. The HAWA adopt a global pheromone updating procedure using the leadership hierarchy concept from the Grey Wolf Optimizer (GWO) into Ant Colony Optimization (ACO) to enhance the algorithm performance. In GWO, three leaders are assigned to guide the search direction, instead of a single leader in most of the metaheuristic algorithms. Three assembly case studies used to test the algorithm performance. Findings The proposed Hybrid Ant-Wolf Algorithm (HAWA) performed better in comparison to genetic algorithm, ACO and GWO because of balance between exploration and exploitation. The best solution guides the search direction, while the neighboring solutions from leadership hierarchy concept avoid algorithm trapped in a local optimum. Originality/value The originality of this research is on the proposed Hybrid Ant-Wolf Algorithm. In addition to the standard pheromone updating procedure, a global pheromone updating procedure is introduced, which adopted leadership hierarchy concept from GWO.
      Citation: Assembly Automation
      PubDate: 2017-02-22T12:11:20Z
      DOI: 10.1108/AA-11-2016-143
       
  • An Assembly Sensitivity Analysis Method Based on State Space Model
    • First page: 249
      Abstract: Assembly Automation, Volume 37, Issue 2, April 2017.
      Purpose This paper considers a problem of assembly sensitivity in a multi-station assembly process. The authors focus on the assembly process of aircrafts, which includes cabins and INSs, and establishes the assembly process state space model for their assembly sensitivity research. Design/methodology/approach To date, the process related errors that cause large variations of key product characteristics (KPCs) remains one of the most critical research topics in assembly sensitivity analysis. We focus on the unique challenges brought by the multi-station system: (1) a system level model to characterize the variation propagation in the entire process, (2) the necessity to describe the system response to variation inputs at both station level and single fixture level scales. State space representation is employed to describe the propagation of variation in such a multi-station process, incorporating assembly process parameters such as fixture locating layout at individual stations and station-to-station locating layout change. Findings Following the sensitivity analysis in control theory, a group of hierarchical sensitivity indices is defined and expressed in terms of the system matrices in the state space model, which are determined by the given assembly process parameters. Originality/value A case study of assembly sensitivity for a multi-station assembly process illustrates and validates the proposed methodology.
      Citation: Assembly Automation
      PubDate: 2017-02-22T12:11:24Z
      DOI: 10.1108/AA-04-2016-033
       
  • A Dynamic Simulator for the Ergonomics Evaluation of Powered Torque Tools
           for Human Assembly
    • First page: 1
      Abstract: Assembly Automation, Volume 37, Issue 1, February 2017.
      Purpose A testing device was designed and developed to simulate interaction between human hand-arm dynamics, right-angle computer-controlled power torque tools, and joint tightening task-related variables. Design/methodology/approach The testing rig can simulate a variety of tool, task, and operator conditions. The device includes custom data acquisition electronics and graphical user interface-based software. Human hand-arm dynamics’ simulation is based on the rig’s four-bar mechanism-based design and mechanical components that provide adjustable stiffness (via pneumatic cylinder) and mass (via plates) and non-adjustable damping. The stiffness and mass values used are based on an experimentally validated hand-arm model that includes a database of model parameters. This database is with respect to gender and working posture corresponding to experienced tool operators from a prior study. Findings The rig measures tool handle force and displacement responses simultaneously. Peak force and displacement coefficients of determination (R2) between rig estimations and human testing measurements were 0.98 and 0.85, respectively, for the same set of tool, task, and operator conditions. The rig also provides predicted tool operator acceptability ratings, using a data set from a prior study of discomfort in experienced operators during torque tool use. Research limitations/implications Deviations from linearity may influence handle force and displacement measurements. Stiction (coulomb friction) in the overall rig, as well as in the air cylinder piston, is neglected. The rig’s mechanical damping is not adjustable, despite the fact that human hand-arm damping varies with respect to gender and working posture. Deviations from these assumptions may affect the correlation of handle force and displacement measurements to those of human testing for the same tool, task, and operator conditions. Practical implications This test rig will allow the rapid assessment of the ergonomic performance of DC torque tools, saving considerable time in lineside applications and reducing the risk of worker injury. DC torque tools are an extremely effective way of increasing production rate and improving torque accuracy. Being a complex dynamic system, however, the performance of DC torque tools varies in each application. Changes in worker mass, damping, and stiffness as well as joint stiffness and tool program make each application unique. This test rig models all of these factors and allows quick assessment. Originality/value The rig provides a novel means for quantitative, repeatable dynamic evaluation of right-angle powered torque tools and objective selection of tightening programs. Compared to current static tool assessment methods, dynamic testing provides a more realistic tool assessment relative to the tool operator’s experience. This may lead to improvements in tool or controller design and reduction in associated musculoskeletal discomfort in operators.
      Citation: Assembly Automation
      PubDate: 2017-01-05T12:42:38Z
      DOI: 10.1108/AA-12-2015-126
       
  • Investigations for improving the surface finish of FDM based ABS replicas
           by chemical vapor smoothing process: A case study
    • First page: 13
      Abstract: Assembly Automation, Volume 37, Issue 1, February 2017.
      Purpose In this research work an effort has been made to investigate the affect of fused deposition modelling (FDM) process parameters on the surface finish of acrylonitrile butadiene styrene (ABS) replicas (as pre-processing stage), followed by chemical vapor smoothing (CVS) process (as post processing stage) as a case study. Design/methodology/approach The Taguchi L18 orthogonal array has been used for optimizing process parameters of FDM and CVS process. Findings This study highlights that orientation and part density and the interaction between these two have significant effect on the surface finish at pre-processing stage of FDM. However, after post processing with CVS there is hardly any influence of pre-processing FDM parameters. Originality/value The study highlights that for improving the productivity of FDM process, the parametric optimization of process may be made on basis of production cost and time in place of surface finish of ABS replicas. The results obtained have been verified by performing the confirmation experiments.
      Citation: Assembly Automation
      PubDate: 2017-01-05T12:42:37Z
      DOI: 10.1108/AA-12-2015-127
       
  • Control system designing for correcting wing-fuselage assembly deformation
           of a large aircraft
    • First page: 22
      Abstract: Assembly Automation, Volume 37, Issue 1, February 2017.
      Purpose In aircraft wing-fuselage assembly, distributed multi-point support layout of positioners causes fuselage deform under gravity load, leading to assembly difficulty and assembly stress. This paper proposes a hybrid force position control method to balance aerodynamic shape accuracy and deformation of assembly area, thereby correcting assembly deformation and reducing assembly stress. Design/methodology/approach Force and position control axes of positioners are selected based on screw theory and ellipsoid method. The position-control axes follow the posture trajectory to align the fuselage posture. To exert force on the fuselage and correct the deformations, the force-control axes follow the contact force derived by using orthogonal experiments and partial least squares regression (PLSR). Finite element simulation and one-dimension deformation correction experiment are conducted to verify the validity of this method. Findings Simulation results indicate that hybrid force position control method can correct assembly deformation and improve the wing-fuselage assembly quality significantly. Experiment on specimen verifies the effect of this method indirectly. Originality/value The proposed method gives a solution to solve the deformation problem during aircraft wing-fuselage assembly, thereby reducing assembly stress and improving assembly quality.
      Citation: Assembly Automation
      PubDate: 2017-01-05T12:42:36Z
      DOI: 10.1108/AA-01-2016-006
       
  • Mixed-model multi-manned assembly line balancing problem: a mathematical
           model and a simulated annealing approach
    • First page: 34
      Abstract: Assembly Automation, Volume 37, Issue 1, February 2017.
      Purpose This paper studies a generalized type of mixed-model assembly line with multi-manned workstations where multiple workers simultaneously perform different tasks on the same product. This special kind of assembly line is usually utilized to assemble different models of large products, such as buses and trucks, on the same production line. Design/methodology/approach To solve the mixed-model multi-manned assembly line balancing problem optimally, a new mixed-integer-programming (MIP) model is presented. The proposed MIP model is NP-hard, and as a result, a simulated annealing (SA) algorithm is developed in order to find the optimal or near optimal solution in a small amounts of computation time. Findings The performance of the proposed algorithm is examined for several test problems in terms of solution quality and running time. The experimental results show that the proposed algorithm has a satisfactory performance from computational time efficiency and solution accuracy. Originality/value This research is the very first study that minimizes the number of workers and workstations simultaneously, with a higher priority set for the number of workers, for a mixed model multi-manned assembly line using a novel MIP formulation and SA algorithm.
      Citation: Assembly Automation
      PubDate: 2017-01-05T12:42:39Z
      DOI: 10.1108/AA-02-2016-016
       
  • Scheduling the in-house logistics distribution for automotive assembly
           lines with just-in-time principles
    • First page: 51
      Abstract: Assembly Automation, Volume 37, Issue 1, February 2017.
      Purpose This paper aims to investigate the just-in-time(JIT) in-house logistics problem for automotive assembly lines. A point to point(P2P) JIT distribution model has been formulated to specify the destination station and parts quantity of each delivery for minimizing line-side inventory levels. Design/methodology/approach An exact backtracking procedure integrating with dominance properties is presented to cope with small scale instances. As for real-world instances, this study develops a modified discrete artificial bee colony(MDABC) metaheuristic. The neighbor search of MDABC is redefined by a novel differential evolution loop and a breadth-first search. Findings The backtracking method has efficaciously cut unpromising branches and solved small scale instances to optimality. Meanwhile, the modifications have enhanced exploitation abilities of the original metaheuristic and good approximate solutions are obtained for real-world instances. Furthermore, inventory peaks are avoided according to the simulation results which validates the effectiveness of this mathematical model to facilitate an efficient JIT parts supply. Research limitations/implications This study is applicable only if the breakdown of transport devices is not considered. The current work has effectively facilitated the P2P JIT logistics scheduling in automotive assembly lines, and it could be modified to tackle similar distribution problems featuring time-varying demands. Originality/value Both limited vehicle capacities and no stock-outs constraints are considered, and the combined routing and loading problem is solved satisfactorily for an efficient JIT supply of material in automotive assembly lines.
      Citation: Assembly Automation
      PubDate: 2017-01-05T12:42:35Z
      DOI: 10.1108/AA-04-2016-028
       
  • A new method for automatic shaft-hole assembly of aircraft components
    • First page: 64
      Abstract: Assembly Automation, Volume 37, Issue 1, February 2017.
      Purpose The purpose of this paper is to design a new method to realize automatic assembly of aircraft components with large shafts such as canard and vertical tail. The assembly structure of component with large shaft and fuselage is a mating assembly structure, and it is a challenge to satisfy the precision and assembly requirement. Design/methodology/approach According to the assembly structure features and process requirements of an aircraft component with large shaft, the operating principle of precise assembly system for shaft-hole mating is analyzed in this paper. The model of compliant assembly for shaft-hole mating is constructed, and force condition analysis of the compliant assembly is performed. An automatic precise shaft-hole assembly method for aircraft assembly using 5 degrees of freedom spatial mechanism, compliance technology and servo feeding system is put forward based on the analysis. A 5 degrees of freedom passive compliant experimental equipment has been developed. Findings Application test results of the 5 degrees of freedom passive compliant experimental equipment show that the simulated canard can be mated automatically and accurately through this method with high efficiency and high quality as long as the tip of shaft enters into the range of hole’s chamfer. Practical implications This method has been used in an aircraft assembly project. The practical results show that the aircraft components with large shafts can be mated automatically and accurately through this method with high efficiency and high quality. Originality/value This paper presents a new method and designs a new assembly system to realize the assembly of the aircraft components with large shafts. The research will promote the automation of fuselage assembly.
      Citation: Assembly Automation
      PubDate: 2017-01-05T12:42:40Z
      DOI: 10.1108/AA-04-2016-032
       
  • Space claim analysis for addressing maintenance of key components in
           complex products
    • First page: 71
      Abstract: Assembly Automation, Volume 37, Issue 1, February 2017.
      Purpose The aim of this paper is to provide a new approach involving guidelines and supporting techniques that guarantees all needed space for appropriate product maintenance. Design/methodology/approach The approach is based on two major areas: i/ field survey to understand how maintainability parameter is applied; ii/ converge theory and practice into a systematic space claim method using Computer-Aided Design (CAD) systems to assure proper maintenance procedures at design stages. Findings Case studies from a truck industry conducted following the proposed approach contrast the savings that can be achieved by utilizing a proper space claim for Aftermarket needs against an unsuitable level of participation by maintenance personnel during the design development. Research limitations/implications This approach is highly dependent on maintenance experts with suitable skills on CAD systems. Practical implications Products developed according to the approach envisaged can result in following aspects: i/ lower repair time; ii/ better maintenance procedures on key components; iii/ easier preventive maintenance; iv/ less need for special tools; v/ more ergonomic design; vi/ better communication between design and service engineers; vii/ simplicity; and viii/ less complex training. Originality/value A new process is presented, considering the protection of needed spaces for maintenance procedures throughout the PDP, diverging to other studies that only propose analysis addressing maintainability at singular point in time during the product development. In just one case study presented, savings of USD$ 1.3M were achieved by applying this space claim approach.
      Citation: Assembly Automation
      PubDate: 2017-01-05T12:42:40Z
      DOI: 10.1108/AA-04-2016-038
       
  • Design methodology for a hybrid part feeding system in lean-based assembly
           lines
    • First page: 84
      Abstract: Assembly Automation, Volume 37, Issue 1, February 2017.
      Purpose The aim of the paper is proposing a combined methodology to help decision makers in evaluating and selecting the most effective part feeding system. Design/methodology/approach As a first step of the methodology, a hierarchical clustering analysis is applied to design a kitting or hybrid feeding system. Secondly, Activity Based Costing (ABC) methodology is applied to determine which system is better according to their costs. Besides, sensitivity analysis is implemented to observe the behavior of the system in case of the takt time changes. Findings Using kitting systems purely can lead to problems because of the big and expensive parts in the mixed-model assembly systems. Therefore, the hybrid feeding policy can provide better solutions for such systems. Research limitations/implications A case study is conducted in a company and the most produced product of the company is considered to design of the part feeding system. Results indicated that transportation cost has a large proportion on the total cost and the hybrid feeding policy may be a good solution to reduce this cost. Practical implications The paper includes implications for the design of hybrid feeding systems in lean-based assembly lines. The proposed methodology may be practical tool for decision makers to design and decision on the part feeding policy. Originality/value Kitting design has not been studied yet to the best of author’s knowledge. Besides, there is no certain decision methodology indicating which system is better. In this study, different methods are combined as a new methodology with the purpose of industrial decision making.
      Citation: Assembly Automation
      PubDate: 2017-01-05T12:42:38Z
      DOI: 10.1108/AA-09-2016-114
       
  • Field Oriented Predictive Control Strategy for Induction Machine Drives
    • First page: 103
      Abstract: Assembly Automation, Volume 37, Issue 1, February 2017.
      Purpose In order to drive the induction machine system with low switching frequency Design/methodology/approach An unconventional inverter control strategy—field oriented predictive control (FOPC), is presented. The strategy limits current distortion by setting a boundary circle. The voltage vector, which could keep current trajectories in boundary, is selected to obtain low switching frequency. Findings A dual simulation step technique is developed to investigate the influence of sampling frequency on current distortion control and switching frequency.Current control distortion can be improved reduced by increasing sampling frequency; however, switching frequency will also rise. Such law is discovered by dual simulation step technique and finally verified by experiments. Originality/value A new predictive control method, Field Oriented Predictive Control (FOPC), is derived from the rotor filed coordinate machine model and presented in this paper. FOPC circumvents derivative calculations, and thus avoids high frequency noise amplification.
      Citation: Assembly Automation
      PubDate: 2017-01-05T12:42:41Z
      DOI: 10.1108/AA-10-2016-132
       
  • A Convergence-guaranteed Particle Swarm Optimization Method for Mobile
           Robot Global Path Planning
    • First page: 114
      Abstract: Assembly Automation, Volume 37, Issue 1, February 2017.
      Purpose Aiming at obtaining a high-quality global path for a mobile robot which works in complex environments, a modified particle swarm optimization (PSO) algorithm, named random-disturbance self-adaptive PSO (RDSAPSO), is proposed in this paper. Design/methodology/approach A perturbed global updating mechanism is introduced to the global best position to avoid stagnation in RDSAPSO. Moreover, a new self-adaptive strategy is proposed to fine-tune the three control parameters in RDSAPSO to dynamically adjust the exploration and exploitation capabilities of RDSAPSO. Since the convergence of PSO is paramount and influences the quality of the generated path, this paper also analytically investigates the convergence of RDSAPSO and provides a convergence-guaranteed parameter selection principle for RDSAPSO. Finally, a RDSAPSO-based global path planning method is developed, in which the feasibility-based rule is applied to handle the constraint of the problem. Findings In an attempt to validate the proposed method, it is compared against six state-of-the-art evolutionary methods under three different numerical simulations. The simulation results confirm that the proposed method is highly competitive in terms of the path optimality. Moreover, the computation time of the proposed method is comparable with those of the other compared methods. Originality/value Therefore, the proposed method can be considered as a vital alternative in the field of global path planning.
      Citation: Assembly Automation
      PubDate: 2017-01-05T12:42:34Z
      DOI: 10.1108/AA-03-2016-024
       
  • Mathematical Model of Robotic Assembly by means of Adaptation and
           Low-frequency Vibration
    • First page: 130
      Abstract: Assembly Automation, Volume 37, Issue 1, February 2017.
      Purpose A model enables us to determine the reaction at the contact points of parts and time based contact conditions changes. Therefore, the conditions of jamming parts can be defined in the process of conjugation. Design/methodology/approach A mathematical model describing the trajectory of the part mass center in robotic assembly is created. An experimental equipment is also presented in the article. Convergence of theoretical and experimental results that characterize the reliability of processes is estimated. Findings The mathematical model of the connection process dynamics in the form of Lagrange's equations of the second kind. Originality/value Applying low-frequency vibration and the adaptive gripper are proposed to extend technological capabilities of robotic assembly.
      Citation: Assembly Automation
      PubDate: 2017-01-05T12:42:41Z
      DOI: 10.1108/AA-04-2016-036
       
  • Assembly line design considering line balancing and part feeding
    • First page: 135
      Abstract: Assembly Automation, Volume 37, Issue 1, February 2017.
      Purpose This paper aims to optimize the configuration of assembly lines (ALs) considering the two long-term decision problems within the line balancing and part feeding (PF) contexts, when the supermarket concept is applied in PF. Design/methodology/approach To this purpose a bi-level mathematical model is proposed to deal with the assembly line balancing problem (ALBP) and supermarket location problem (SLP) during the strategic decision making phase of ALs configuration. The proposed model is applied on the known test problems taken from the ALBP literature to verify its performance. Findings The computational results verify that when the proposed structure is applied the resulting AL configurations are optimized from both ALBP and SLP considerations in terms of number of stations and line efficiency as well as supermarket transportation and installation costs. Originality/value No study has yet dealt with the long-term decision problem of configuring ALs considering both ALBP and SLP. Also this study validates the effect of the ALBP on the SLP solutions as two long-term interrelated decision problems.
      Citation: Assembly Automation
      PubDate: 2017-01-05T12:42:35Z
      DOI: 10.1108/AA-09-2016-122
       
 
 
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