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COMPUTER SCIENCE (1129 journals)                  1 2 3 4 5 6 7 8 | Last

3D Printing and Additive Manufacturing     Full-text available via subscription  
Abakós     Full-text available via subscription  
Academy of Information and Management Sciences Journal     Full-text available via subscription   (Followers: 38)
ACM Computing Surveys     Full-text available via subscription   (Followers: 16)
ACM Journal on Computing and Cultural Heritage     Full-text available via subscription   (Followers: 3)
ACM Journal on Emerging Technologies in Computing Systems     Full-text available via subscription   (Followers: 9)
ACM Transactions on Accessible Computing (TACCESS)     Full-text available via subscription   (Followers: 4)
ACM Transactions on Algorithms (TALG)     Full-text available via subscription   (Followers: 12)
ACM Transactions on Applied Perception (TAP)     Full-text available via subscription   (Followers: 5)
ACM Transactions on Architecture and Code Optimization (TACO)     Full-text available via subscription   (Followers: 5)
ACM Transactions on Autonomous and Adaptive Systems (TAAS)     Full-text available via subscription   (Followers: 6)
ACM Transactions on Computation Theory (TOCT)     Full-text available via subscription   (Followers: 11)
ACM Transactions on Computational Logic (TOCL)     Full-text available via subscription   (Followers: 3)
ACM Transactions on Computer Systems (TOCS)     Full-text available via subscription   (Followers: 10)
ACM Transactions on Computer-Human Interaction     Full-text available via subscription   (Followers: 6)
ACM Transactions on Computing Education (TOCE)     Full-text available via subscription   (Followers: 2)
ACM Transactions on Design Automation of Electronic Systems (TODAES)     Full-text available via subscription   (Followers: 2)
ACM Transactions on Economics and Computation     Full-text available via subscription  
ACM Transactions on Embedded Computing Systems (TECS)     Full-text available via subscription   (Followers: 2)
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ACM Transactions on Intelligent Systems and Technology (TIST)     Full-text available via subscription   (Followers: 6)
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Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 10)
Advances in Human-Computer Interaction     Open Access   (Followers: 15)
Advances in Materials Sciences     Open Access   (Followers: 9)
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Advances in Parallel Computing     Full-text available via subscription   (Followers: 7)
Advances in Porous Media     Full-text available via subscription   (Followers: 3)
Advances in Remote Sensing     Open Access   (Followers: 8)
Advances in Science and Research (ASR)     Open Access   (Followers: 7)
AEU - International Journal of Electronics and Communications     Hybrid Journal   (Followers: 5)
African Journal of Mathematics and Computer Science Research     Open Access   (Followers: 2)
AGE     Hybrid Journal   (Followers: 4)
Age and Ageing     Hybrid Journal   (Followers: 25)
AI EDAM     Hybrid Journal   (Followers: 1)
Air, Soil & Water Research     Open Access   (Followers: 6)
AIS Transactions on Human-Computer Interaction     Open Access   (Followers: 4)
Algebras and Representation Theory     Hybrid Journal  
Algorithmica     Hybrid Journal   (Followers: 4)
Algorithms     Open Access   (Followers: 9)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 2)
American Journal of Computational Mathematics     Open Access   (Followers: 1)
Anais da Academia Brasileira de Ciências     Open Access   (Followers: 2)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 4)
Analysis in Theory and Applications     Hybrid Journal  
Animation Practice, Process & Production     Hybrid Journal   (Followers: 6)
Annals of Combinatorics     Hybrid Journal   (Followers: 5)
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: 7)
Annual Reviews in Control     Hybrid Journal   (Followers: 4)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applied and Computational Harmonic Analysis     Full-text available via subscription  
Applied Artificial Intelligence: An International Journal     Hybrid Journal   (Followers: 5)
Applied Categorical Structures     Hybrid Journal   (Followers: 1)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 9)
Applied Computer Systems     Open Access   (Followers: 1)
Applied Environmental Education & Communication     Hybrid Journal   (Followers: 11)
Applied Intelligence     Hybrid Journal   (Followers: 6)
Applied Mathematics and Computation     Hybrid Journal   (Followers: 137)
Applied Medical Informatics     Open Access   (Followers: 6)
Applied Numerical Analysis & Computational Mathematics     Hybrid Journal   (Followers: 5)
Applied Numerical Mathematics     Hybrid Journal   (Followers: 7)
Applied Soft Computing     Hybrid Journal   (Followers: 8)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 2)
Architectural Theory Review     Hybrid Journal   (Followers: 1)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 3)
Archives and Museum Informatics     Hybrid Journal   (Followers: 175)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
arq: Architectural Research Quarterly     Hybrid Journal   (Followers: 9)
Artifact     Hybrid Journal   (Followers: 2)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 4)
Artificial Intelligence in Medicine     Hybrid Journal   (Followers: 9)
Artificial Intelligence Review     Hybrid Journal   (Followers: 8)
Artificial Life     Hybrid Journal   (Followers: 5)
Asia Pacific Journal on Computational Engineering     Open Access  

        1 2 3 4 5 6 7 8 | Last

Journal Cover Assembly Automation
   Journal TOC RSS feeds Export to Zotero [3 followers]  Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
     ISSN (Print) 0144-5154
     Published by Emerald Homepage  [308 journals]   [SJR: 0.301]   [H-I: 18]
  • Illumination characteristics and image stitching for automatic inspection
           of bicycle part
    • Authors: Wen-Yang Chang et al
      Abstract: Assembly Automation, Volume 34, Issue 4, August 2014. Purpose Illumination Characteristics and Image Stitching for Automatic Inspection of Bicycle Parts Design/methodology/approach The unrealistic color casts of feature inspection is removed using white balance for global adjustment. The scale-invariant feature transforms (SIFT) is used to extract and detect the image features of image stitching. The Hough transform is used to detect the parameters of a circle for roundness of bicycle parts. Findings Results showed that maximum errors of 0°, 10°, 20°, 30°, 40° and 50° degrees for the spectral illumination of white light LED arrays with differential shift displacements are 4.4, 4.2, 7.8, 6.8, 8.1 and 3.5 %, respectively. The deviation error of image stitching for the stem accessory in x and y coordinates are 2 pixels. The SIFT and RANSAC enable to transform the stem image into local feature coordinates that are invariant to the illumination change. Originality/value this study can be applied to many fields of modern industrial manufacturing and provide useful information for automatic inspection and image stitching.
      PubDate: Thu, 14 Aug 2014 07:28:11 GMT
       
  • 4D Printing – Dawn of an Emerging Technology Cycle
    • Authors: Eujin Pei et al
      Abstract: Assembly Automation, Volume 34, Issue 4, August 2014. Purpose This article reviews state-of-the-art developments in 4D printing, discusses what it is, investigates new applications that have been discovered and suggests its future impact Design/methodology/approach The article clarifies the definition of 4D printing and describes notable examples covering material science, equipment and applications Findings This paper highlights an emerging technology cycle where 4D printing research has gained traction within additive manufacturing. The use of stimuli-responsive materials can be programmed and printed to enable pre-determined reactions when subject to external stimuli Originality/value This article reviews state-of-the-art developments in 4D printing, discusses what it is, investigates new applications that have been discovered and suggests its future impact
      PubDate: Thu, 14 Aug 2014 07:28:11 GMT
       
  • Peg-bush alignment under elastic vibrations
    • Authors: Edvardas Sadauskas et al
      Abstract: Assembly Automation, Volume 34, Issue 4, August 2014. Purpose The paper theoretically and experimentally investigates vibratory peg-bush alignment using elastic vibrations of the peg, when the peg is axially excited by a pressed piezoelectric vibrator on the upper end Design/methodology/approach Experimental research of part alignment using elastic vibrations was performed and dependencies of alignment duration on excitation signal parameters and initial pressing force were defined for rectangular and circular cross-section parts. Mathematical model of two-mass dynamic systems with elastic contact model representing alignment process was created. Dependencies of system parameters on the alignment duration were obtained by numerically solving systems differential equations. Findings Theoretical and experimental investigation approved the usage of elastic vibrations for alignment of chamferless circular and rectangular cross-section parts. This novel method of part alignment compensates axial misalignment between mating parts by directional displacement of movably based bush. Research limitations/implications Impact and non-impact interaction between bush and peg is possible however only non-impact regime was investigated. Static and dynamic coefficient of friction between the parts is equivalent and do not depend on relative velocity of parts. Practical implications The results are useful in designing reliable and effective assembly equipment with vibratory assistance alignment for peg-to-bush operations which do not require auxiliary sensors and feedback systems. Use of piezoelectric resonator for peg excitation makes this system easy adaptable to the existing automated assembly equipment. Originality/value The proposed method is a new approach to vibratory alignment. The data obtained during investigation expands the insight of the physical processes that drive bush to the axial alignment direction.
      PubDate: Thu, 14 Aug 2014 07:28:10 GMT
       
  • Optional classification for reassembly methods with different precision
           remanufactured parts
    • Authors: Mingzhou LIU et al
      Abstract: Assembly Automation, Volume 34, Issue 4, August 2014. Purpose Remanufactured product quality is the soul of the remanufacturing project. In this paper, we research on,base on the integration of mechanical(dimensional chain), mathematics(measurement uncertainty) and management(optional classification),how to reassembly (remanufacturing assembly) to achieve that the quality not lower than original production with different precision remanufactured parts. Design/methodology/approach First, this paper studies the recycled parts features and reassembly features. Second, we build a remanufactured parts dimensional precision mathematical model, and it is proven that optional classification can effectively improve the reassembly accuracy mathematically. Then the optimization model of optional classification for reassembly is proposed under the constraint of dimensional chain, and the solution is studied based on PSO(Particle Swarm Optimization). Finally, this method is applied in a remanufacturing enterprise and achieves good results. Findings The method can reduce the cost of quality loss and improve the quality of remanufactured products. So it provides a new solution and idea for reassembly with different precision remanufactured parts and promotes the healthy development of reverse logistics with a high level of customer satisfaction. Originality/value his method can maximize the use of different levels of quality remanufactured parts and improve reassembly accuracy by mathematical proofs and examples. This paper gives an efficient, reliable and feasible solution for lean management of Complex electromechanical products reassembly. Managerial insights from the results will help remanufacturers to make decisions on optimal control of remanufacturing assembly system.
      PubDate: Thu, 14 Aug 2014 07:28:10 GMT
       
  • Inspector Robot - a new collaborative testing system designed for the
           automotive final assembly line
    • Authors: Matthias Scholer et al
      Abstract: Assembly Automation, Volume 34, Issue 4, August 2014. Purpose The paper delivers an approach of how lightweight robot systems can be used to automate manual processes for higher efficiency, increased process capability and enhanced ergonomics. To show how these systems can be utilized in practice, a new collaborative testing system for an automated water leak test was designed using an image processing system utilized by the robot. Design/methodology/approach The ‘water leak test’ in an automotive final assembly line is often a significant cost factor due to its labour intensive nature. This is particularly the case for premium car manufacturers as each vehicle is watered and manually inspected for leakage. This paper delivers an approach that optimises the efficiency and capability of the test process by using a new automated in-line inspection system whereby thermographic images are taken by a lightweight robot system and then processed to locate the leak. Such optimisation allows the collaboration of robots and manual labour which in turn enhances the capability of the process station. Findings This paper examines the development of novel applications for lightweight robotic systems and provides a suitable process whereby the systems are optimised in technical, ergonomic and safety-related aspects. Research limitations/implications A new automated testing process in combination with a processing algorithm was developped Practical implications To optimize and validate the system it was set up in a true to reality model factory and brought to a prototypical status. Several OEM's showed great interest in implementing the system in their assembly line. Originality/value A lightweight robotic system was implemented in a continuous assembly line as a new area of application for these systems. The automated water leak test gives a practical example of how to enrich the assembly and commissioning lines, which are currently dominated by manual labour, with new technologies. This is necessary to reach a higher efficiency and process capability while maintaining a higher flexibility potetial than fully automated systems.
      PubDate: Thu, 14 Aug 2014 07:28:07 GMT
       
  • Modeling of fast pre-joining processes optimization for skin-stringer
           panels
    • Authors: Gang Liu et al
      Abstract: Assembly Automation, Volume 34, Issue 4, August 2014. Purpose For the automatic riveting in panel assemblies, the traditional approach of determination of pre-joining processes entirely rests on the experience of workers, which leads to the improper number, location and sequence of pre-joining, the low quality stability and the high repair rate in most cases. The purpose of this paper is to propose a new model for optimizing pre-joining processes quickly and accurately, guiding workers to standardized operations. Design/methodology/approach The clearances computation with the Complete Finite Element Model for every process combination is time-consuming. Therefore a Fast Pre-joining Processes Optimization Model is proposed. This model treats both the measured initial clearances and the stiffness matrices of key points of panels as an input, considers the permissive clearances as an evaluation criterion, regards the optimal number, location and sequence as an objective, and takes the Neighbourhood-Search-based Adaptive Genetic Algorithm as a solution. Findings A comparison between the Fast Pre-joining Processes Optimization Model and Complete Finite Element Model with Clearances was made in practice. And the results indicate that running the Fast Pre-joining Processes Optimization Model is time-saving more than by 90% compared with the Complete Finite Element Model with Clearances. Practical implications This paper provides practical insights into realizing the pre-joining processes optimization quickly. Originality/value This paper is the first to propose the Fast Pre-joining Processes Optimization Model, which could simplify the processes, reduce the degrees of freedom of nodes and conduct the manufacturers to standardized manipulations.
      PubDate: Thu, 14 Aug 2014 07:28:07 GMT
       
  • What future for humans in assembly'
    • Authors: Robert Bogue et al
      Abstract: Assembly Automation, Volume 34, Issue 4, August 2014. Purpose This paper aims to investigate the predicted expansion of robotic and 3D printing technologies and its impact on the global assembly and manufacturing workforce. Design/methodology/approach Following an introduction, this paper first considers the anticipated proliferation of industrial robots and then discusses 3D printing. It concludes with a discussion of the impact of these technologies on emplyment. Findings This shows that a major expansion in the use of robotics is imminent and that 3D printing is emerging as a major manufacturing technology. These trends will reduce considerably the size of the assembly and manufacturing workforce. Originality/value This paper provides a timely review of the impact of advanced robotics and 3D printing on employment in assembly and manufacture.
      PubDate: Thu, 14 Aug 2014 07:28:06 GMT
       
  • Human factors automatic evaluation for entire maintenance processes in
           virtual environment
    • Authors: Shiguang Qiu et al
      Abstract: Assembly Automation, Volume 34, Issue 4, August 2014. Purpose The paper aims to propose a systematic approach for human factors (HFs) automatic evaluation for entire maintenance processes in virtual environment. Design/methodology/approach Firstly, a maintenance process information model is constructed to map real maintenance processes into computer environment. Next, based on this information model, the automatic evaluation methods for visibility, operation comfort and reachability are presented. All evaluation results are weighted and added up to establish a comprehensive HFs evaluation model. Then, the methods mentioned above are realized as a HFs evaluation module, which is integrated into VMSP, software developed by our lab. Findings An application in HFs evaluation of repairing hydraulic motor on container spreader is implemented, and an on-site survey is carried out. The comparison between the result from the survey and the result we get using the presented methods shows that our solution can support HFs fast assessment accurately and effectively. Practical implications Through evaluating maintenance operation processes, engineers can better analyze and validate the maintainability design of complex equipment, and some potential ergonomic issues can be found and dealt earlier. Originality/value The paper contributes to present a systematic approach to achieve HFs fast and accurate evaluation for entire maintenance processes, rather than for a few maintenance postures.
      PubDate: Thu, 14 Aug 2014 07:28:01 GMT
       
  • An air-filled microgripper in microassembly system with coaxial alignment
           function
    • Authors: Xin Ye et al
      Abstract: Assembly Automation, Volume 34, Issue 4, August 2014. Purpose The purpose of this paper is to design a microgripper that can achieve nondestructive gripping of a miniaturized ultra-thin-walled cylindrical part. Design/methodology/approach The microgripper is mainly made of inflatable silica gel gasbag, which can minimize the damage to the part in the gripping process. This paper introduces the design principle of a flexible air-filled microgripper, which is applied in an in-house microassembly system with coaxial alignment function (MSCA). Its parameters and performance specifications have been obtained by simulation, experiment demarcating. The results show that the microgripper is able to grasp an ultra-thin-walled part non-destructively. Findings For the microgripper, finite element simulations and experiments were carried out, and both results indicate that the microgripper can achieve nondestructive gripping of a miniaturized ultra-thin-walled cylindrical part, with good stability, great grasping force and high repeat positioning accuracy. Originality/value Gripping the ultra-thin-walled part may lead to deformation and destruction easily. It has been a big bottleneck hindering successful assembly. This article introduces a novel microgripper using inflatable sac. The work is interesting from an industrial point of view for a specific category of assembly applications. It provides a theoretical guidance and technical support to design a microgripper for a miniaturized ultra-thin-walled part of different sizes.
      PubDate: Thu, 14 Aug 2014 07:27:59 GMT
       
  • Development of an adaptive part feeder for handling sector-shaped parts
    • Authors: S. Udhayakumar et al
      Abstract: Assembly Automation, Volume 34, Issue 3, Page 227-236, July 2014. Purpose – The purpose of this paper is to discuss a linear vibratory part feeder for handling brake liners, typical sector-shaped components. Part feeders have been used in the industries for a long time to present the parts in a desired orientation. Berretty et al. (1999) discussed a class of mechanical filters that are capable of removing polygonal sections from the track of the feeder which are referred to as traps. The traps eliminate or reorient the parts until they reach the final desired orientation. A part feeder was developed using traps, to reorient the sector-shaped part to desired orientation. The desired orientation was the most probable natural resting orientation. The trap was mounted on a linear vibratory feeder. The adaptive part feeder developed was capable of identifying the size of the incoming part and adjust the trap to accommodate that. This set-up eliminates the use of different traps for different-sized sector-shaped parts and wastage of productive time in changing the traps for different sizes. A regression model was developed to predict the conveying velocity of part on the feeder. Design/methodology/approach – A part feeder was developed using traps, to reorient the sector-shaped part to desired orientation. Acrylic material was found to be suitable for trap compared to aluminium. The adaptive part feeder developed was capable of identifying the size of the incoming part using proximity sensors. Depending on the size of the incoming part, the track width was adjusted dynamically with the help of a stepper motor, rack and pinion arrangement. A regression model was developed to predict the conveying velocity. Findings – Typical brake liners in the size range of 40-60 mm (radius) were considered for developing the adaptive part feeder. Based on performance studies, the acrylic trap was found better than aluminium traps. The appropriate frequency and amplitude of vibration for maximum conveying velocity of the adaptive part feeder were found experimentally. Regression equation was developed to determine the conveying velocity based on input frequency and amplitude. The regression results were found to be in close agreement with the experimental results. Research limitations/implications – The developed part feeder is suitable for handling sector-shaped parts only. Originality/value – This paper demonstrates an inexpensive adaptive part feeding device for handling sector-shaped parts which can be extended for handling other asymmetric parts also.
      PubDate: Mon, 11 Aug 2014 07:31:29 GMT
       
  • Automatic disassembly navigation for accurate virtual assembly path
           planning
    • Authors: Wanbin Pan et al
      Abstract: Assembly Automation, Volume 34, Issue 3, Page 244-254, July 2014. Purpose – The purpose of this paper is to develop an automatic disassembly navigation approach for human interactions in the virtual environment to achieve accurate and effective virtual assembly path planning (VAPP). Design/methodology/approach – First, to avoid the error-prone human interactions, a constraint-based disassembly method is presented. Second, to automatically provide the next operable part(s), a disassembly navigation mechanism is adopted. Finally, the accurate assembly path planning can be obtained effectively and automatically by inversing the ordered accurate disassembly paths, which are obtained interactively in the virtual environment aided with the disassembly navigation matrix. Findings – The applications present that our approach can effectively avoid the error-prone interactive results and generate accurate and effective VAPP. Research limitations/implications – There are several works that could be conducted to make our approach more general in the future: to further study the basic disassembly direction deducing rules to make the process of determining disassembly direction totally automatic, to consider the hierarchy of the parts in virtual reality system and to consider the space for assembly/disassembly tools or operators. Originality/value – The approach has the following characteristics: a new approach to avoid the error-prone human interactions for accurate assembly path planning obtaining, a new constraint deducing method for determining the disassembly semantics automatically or semi-automatically is put forward and a new method for automatically identifying operable parts in VAPP is set forward.
      PubDate: Mon, 11 Aug 2014 07:31:25 GMT
       
  • Fitting optimization based on weighted Gaussian imaging method for auto
           body taillight assembly
    • Authors: Xiang Gao et al
      Abstract: Assembly Automation, Volume 34, Issue 3, Page 255-263, July 2014. Purpose – Fitting evenness is one key characteristic for three-dimensional objects' optimal fit. The weighted Gaussian imaging method is developed for fitting evenness of auto body taillight fitting optimization. Design/methodology/approach – Fitting boundary contours are extracted from scanning data points. Optimal fitting target is represented with gap and flushness between taillight and auto body. By optimizing the fitting position of the projected boundary contours on the Gaussian sphere, the weighted Gaussian imaging method accomplishes optimal requirements of gap and flushness. A scanning system is established, and the fitting contour of the taillight assembly model is extracted to analyse the quality of the fitting process. Findings – The proposed method accomplishes the fitting optimization for taillight fitting with higher efficiency. Originality/value – The weighted Gaussian imaging method is used to optimize the taillight fitting. The proposed method optimized the fitting objects' 3-D space, while the traditional fitting methods are based on 2-D algorithm. Its time complexity is O(n3), while those of the traditional methods are O(n5). The results of this research will enhance the understanding of the 3-D optimal fitting and help in systematically improving the productivity and the fitting quality in automotive industry.
      PubDate: Mon, 11 Aug 2014 07:31:22 GMT
       
  • A new assembly variation analysis model based on the method of power
           balance for auto-body parts
    • Authors: Yanfeng Xing et al
      Abstract: Assembly Automation, Volume 34, Issue 3, Page 296-302, July 2014. Purpose – The purpose of this paper is to propose a new assembly variation analysis model to analyze assembly variation for sheet metal parts. The main focus is to analyze assembly processes based on the method of power balance. Design/methodology/approach – Starting with issues in assembly variation analysis, the review shows the critical aspects of tolerance analysis. The method of influence coefficient (MIC) cannot accurately analyze the relationship between part variations and assembly variations, as the welding point is not a point but a small area. Therefore, new sensitivity matrices are generated based on the method of power balance. Findings – Here two cases illustrate the processes of assembly variation analysis, and the results indicate that new method has higher accuracy than the MIC. Research limitations/implications – This study is limited to assembly variation analysis for sheet metal parts, which can be used in auto-body and airplane body. Originality/value – This paper provides a new assembly variation analysis based on the method of power balance.
      PubDate: Mon, 11 Aug 2014 07:31:20 GMT
       
  • An improved vision calibration method for coaxial alignment microassembly
    • Authors: Xin Ye et al
      Abstract: Assembly Automation, Volume 34, Issue 3, Page 237-243, July 2014. Purpose – The purpose of this paper is to propose a sub-pixel calibration method for a microassembly system with coaxial alignment function (MSCA) because traditional sub-pixel calibration approaches cannot be used in this system. Design/methodology/approach – The in-house microassembly system comprises a six degrees of freedom (6-DOF) large motion serial robot with microgrippers, a hexapod 6-DOF precision alignment worktable and a vision system whose optical axis of the microscope is parallel with the horizontal plane. A prism with special coating is fixed in front of the objective lens; thus, two parts’ Figures, namely the images of target and base part, can be acquired simultaneously. The relative discrepancy between the two parts can be calculated from image plane coordinate instead of calculating space transformation matrix. Therefore, the traditional calibration method cannot be applied in this microassembly system. An improved calibration method including the check corner detection solves the distortion coefficient conversely. This new way can detect the corner at sub-pixel accuracy. The experiment proves that the assembly accuracy of the coaxial microassembly system which has been calibrated by the new method can reach micrometer level. Findings – The calibration results indicate that solving the distortion conversely could improve the assembly accuracy of MSCA. Originality/value – The paper provides certain calibration methodological guidelines for devices with 2 dimensions or 2.5 dimensions, such as microelectromechanical systems devices, using MSCA.
      PubDate: Mon, 11 Aug 2014 07:31:20 GMT
       
  • Random bin picking: has its time finally come'
    • Authors: Robert Bogue Consultant
      Abstract: Assembly Automation, Volume 34, Issue 3, Page 217-221, July 2014. Purpose – This paper aims to provide details of recent developments in random bin picking (RBP) technologies and products, together with an insight into its commercial status and prospects. Design/methodology/approach – Following an introduction to RBP, this article discusses the technology, benefits and limitations of RBP. It then considers a number of products and applications and concludes with a brief discussion. Findings – This article shows that RBP offers significant economic and operational benefits, but it is a complex technology and applications remain limited. It is underpinned by advanced machine vision and sophisticated image processing algorithms and continues to be the topic of academic research. Many RBP products have been launched in the past but the latest generation of dedicated vision systems, software packages and fully integrated robotic systems suggest that more widespread applications are imminent. Originality/value – This paper provides a timely introduction to the rapidly developing field of RBP by discussing the technologies and a range of products and applications.
      PubDate: Mon, 11 Aug 2014 07:31:18 GMT
       
  • The repeatability positioning analysis of the industrial robot arm
    • Authors: Rafał Kluz et al
      Abstract: Assembly Automation, Volume 34, Issue 3, Page 285-295, July 2014. Purpose – The purpose of the following work was to work out the dependency to allow for the determination of the repeatability positioning error value of the robot at any given point in its workspace, without the necessity of conducting time-consuming measurements while routing a precise surface of repeatability positioning. Design/methodology/approach – The presented dependency permits for the possibility to determine, even at the planning phase, the optimal connection point in the workspace, ensuring the best parameters for the process of machine assembly, without needless overestimation of precision of the utilized equipment. To solve the task the sequential quadratic programming (SQP) method implemented in the MATLAB(R) environment was used. To verify the hypothesis of the compatibility of the empirical distribution with the hypothetical distribution of the robot’s positioning error, the Kolmogorov test was used. Findings – In this paper, it has been demonstrated theoretically and experimentally that the industrial robot accuracy can vary over a very wide range in the workspace. This provides an additional opportunity to increase reliability of the assembly process through the appropriate choice of the point of parts joining. The methodology presented here allows the designer of assembly workstations to rapidly estimate the repeatability of robot positioning and to allocate at the design stage of assembly process the optimal position in the robot workspace to ensure the required precision, without unnecessarily high accuracy of equipment used and, therefore, without inflated costs. Originality/value – An alternative solution to the stated problem can be the proposed method for determining the robot’s positioning errors, requiring a much smaller amount of measurements to be taken that would be necessary to determine the parameters of the random variable errors of the joint coordinates of the robot and for their verification by the repeatability of positioning in randomly selected points in the workspace. Additionally discussed in the study, the methodology of identifying connection place was designed for typical combinations of machine parts, most frequently encountered in assembly process and was taken into account, typical limitations occurring in actual manufacturing conditions.
      PubDate: Mon, 11 Aug 2014 07:31:06 GMT
       
  • Non-destructive evaluation of stacking sequence in textile composite:
           different techniques and experimental verification
    • Authors: A. Saboktakin et al
      Abstract: Assembly Automation, Volume 34, Issue 3, Page 264-274, July 2014. Purpose – The purpose of this paper is to experimentally investigate the capability of four non-destructive testing (NDT) techniques to detect the layer orientation in textile composite laminates. The aerospace industry has been the primary driving force in the use of textile composites. Design/methodology/approach – Woven glass fiber composite samples were inspected using C-scan ultrasonic, vibration analyzer, X-ray micro-tomography and ultraviolet technique. In a complementary study, mechanical testing was carried out to investigate the effect of mid-layer orientation on in-plane tensile strength and their failure modes using microscopic imagining. Findings – During C-scan ultrasonic, the high attenuation and scattering of ultrasonic waves caused by the textile fabric layers limited its application to only detect the first layer of samples. Frequency response tests of composite samples were also conducted to investigate the effect of mid-layer orientation on dynamic responses. The same trend was observed in the finite element modeling results with a clear effect of the fiber orientation defect seen in frequency response function response and higher mode shapes. Moreover, the results of micro computed tomography demonstrate that this technique could definitely detect the orientation of each layer; however, X-ray imaging at small scales introduced some challenges. Images obtained from ultraviolet technique did not reveal mid-layer orientation. Originality/value – In this paper, the application of different NDT techniques along with finite element modeling to inspect two-dimensional textile composites was presented. Hopefully, the research results presented here will lead to much published papers in inspection of textile composites.
      PubDate: Mon, 11 Aug 2014 07:31:04 GMT
       
  • HARM type MEMS-based reed switch innovations address medical, automotive
           and other micro switching applications not previously possible
    • Authors: Richard Bloss
      Abstract: Assembly Automation, Volume 34, Issue 3, Page 222-226, July 2014. Purpose – The purpose of this paper is to review the advancements in development of high aspect ratio microfabrication (HARM) type of micro-electro-mechanical systems (MEMS) reed switch sensors for much improved performance in a much more compact package. Design/methodology/approach – The paper presents an in-depth review of a number of applications of HARM built MEMS reed switches and consultation with a manufacturer. Findings – One manufacturer has introduced a totally new way to fabricate reed switches which brings numerous benefits such as reliability, higher voltage capability, lower contact resistance and other features in a new tiny package. Practical implications – Manufacturers of devices needing the benefits of the reed switch concept but who need a much smaller and compact switch now have a new option to explore. Originality/value – An expert insight into how to solve reed switching problems where space is at a premium.
      PubDate: Mon, 11 Aug 2014 07:31:03 GMT
       
  • A posture evaluation method for a large component with thermal deformation
           and its application in aircraft assembly
    • Authors: Liang Cheng et al
      Abstract: Assembly Automation, Volume 34, Issue 3, Page 275-284, July 2014. Purpose – The purpose of this paper is to propose a posture evaluation approach based on temperature compensation and three-dimensional (3-D) tolerance for the key points (KPs). Design/methodology/approach – A large component 3-D compensation model of thermal deformation considering characteristics of the assembly object is developed. Then, the thermal deformation compensation model is used to modify the nominal coordinates for the KPs. By using a combination of relative deviations of KPs as the objective and 3-D tolerance as the constraints, an optimization model for posture evaluation is established. Findings – Deviations of posture and KPs’ coordinates are obtained by solving the non-linear constrained optimization problem. The posture evaluation method is demonstrated in both a simulation case and practical implication of the aircraft components assembly system with the result that a good performance is obtained. Practical implications – The proposed method has been used in several aircraft assembly projects in China, and gained a good effect. Originality/value – This paper proposes a method for eliminating the affection of thermal deformation during posture evaluation process and improving the consistency and stability of posture evaluation results. The results of this research will help to systematically improve the manufacturing process and tolerance allocation efficiency in large aircraft assembly.
      PubDate: Mon, 11 Aug 2014 07:30:57 GMT
       
 
 
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