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  Subjects -> COMPUTER SCIENCE (Total: 1956 journals)
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3D Printing and Additive Manufacturing     Full-text available via subscription   (Followers: 5)
Abakós     Full-text available via subscription  
Academy of Information and Management Sciences Journal     Full-text available via subscription   (Followers: 47)
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: 8)
ACM Transactions on Accessible Computing (TACCESS)     Full-text available via subscription   (Followers: 4)
ACM Transactions on Algorithms (TALG)     Full-text available via subscription   (Followers: 13)
ACM Transactions on Applied Perception (TAP)     Full-text available via subscription   (Followers: 6)
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: 13)
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: 13)
ACM Transactions on Computer-Human Interaction     Full-text available via subscription   (Followers: 8)
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: 3)
ACM Transactions on Information Systems (TOIS)     Full-text available via subscription   (Followers: 15)
ACM Transactions on Intelligent Systems and Technology (TIST)     Full-text available via subscription   (Followers: 8)
ACM Transactions on Interactive Intelligent Systems (TiiS)     Full-text available via subscription   (Followers: 4)
ACM Transactions on Multimedia Computing, Communications, and Applications (TOMCCAP)     Full-text available via subscription   (Followers: 7)
ACM Transactions on Reconfigurable Technology and Systems (TRETS)     Full-text available via subscription   (Followers: 5)
ACM Transactions on Sensor Networks (TOSN)     Full-text available via subscription   (Followers: 8)
ACM Transactions on Speech and Language Processing (TSLP)     Full-text available via subscription   (Followers: 7)
ACM Transactions on Storage     Full-text available via subscription  
ACS Applied Materials & Interfaces     Full-text available via subscription   (Followers: 20)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 2)
Acta Informatica     Hybrid Journal   (Followers: 4)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
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Advances in Calculus of Variations     Hybrid Journal   (Followers: 4)
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Advances in Human-Computer Interaction     Open Access   (Followers: 16)
Advances in Materials Sciences     Open Access   (Followers: 11)
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: 3)
Advances in Remote Sensing     Open Access   (Followers: 9)
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: 4)
AGE     Hybrid Journal   (Followers: 4)
Age and Ageing     Hybrid Journal   (Followers: 37)
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: 30)
American Journal of Computational and Applied Mathematics     Open Access   (Followers: 2)
American Journal of Computational Mathematics     Open Access   (Followers: 1)
American Journal of Information Systems     Open Access   (Followers: 2)
American Journal of Sensor Technology     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: 7)
Annals of Combinatorics     Hybrid Journal   (Followers: 6)
Annals of Data Science     Hybrid Journal  
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: 9)
Annual Reviews in Control     Hybrid Journal   (Followers: 5)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applied and Computational Harmonic Analysis     Full-text available via subscription   (Followers: 1)
Applied Artificial Intelligence: An International Journal     Hybrid Journal   (Followers: 7)
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: 13)
Applied Informatics     Open Access  
Applied Intelligence     Hybrid Journal   (Followers: 7)
Applied Mathematics and Computation     Hybrid Journal   (Followers: 65)
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: 10)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 2)
Architectural Theory Review     Hybrid Journal   (Followers: 2)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 3)
Archives and Museum Informatics     Hybrid Journal   (Followers: 110)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 5)
arq: Architectural Research Quarterly     Hybrid Journal   (Followers: 10)
Artifact     Hybrid Journal   (Followers: 2)

        1 2 3 4 5 6 7 8 | Last

Journal Cover   Assembly Automation
  [SJR: 0.439]   [H-I: 20]   [1 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0144-5154
   Published by Emerald Homepage  [310 journals]
  • Lasers in manufacturing: a review of technologies and applications
    • Authors: Robert Bogue
      Abstract: Assembly Automation, Volume 35, Issue 2, April 2015.
      Purpose This article aims to provide details of the role that lasers play in manufacturing processes. Design/methodology/approach Following an introduction, this first considers laser technologies used in welding, cutting and drilling. Techniques which add material or modify a material’s properties, namely pulsed laser deposition, laser cladding, heat treatment and laser peening are then discussed. A number of specific applications are cited and finally, brief conclusions are drawn. Findings This shows that many laser-based processes are used to conduct a range of critical functions in the automotive, electronics, aerospace, power generation, medical and other industries. Originality/value This article illustrates the importance of lasers in a diversity of manufacturing processes.
      Citation: Assembly Automation
      PubDate: Fri, 24 Apr 2015 00:17:49 GMT
      DOI: 10.1108/AA-07-2014-066
       
  • Variation modeling for fuselage structures in large aircraft digital
           assembly
    • Authors: Liang Cheng, Qing Wang, Jiangxiong Li, Yinglin Ke
      Abstract: Assembly Automation, Volume 35, Issue 2, April 2015.
      Purpose The variation accumulated in a large aircraft assembly process will influence the dimensional accuracy and fatigue life of airframes. However, in digital large aircraft assembly, variation analysis and modeling are still unresolved issues. This paper presents a new variation modeling method for fuselage structures in digital large aircraft assembly. Design/methodology/approach An elastic structure model based on beam elements is developed, which is an equivalent idealization of the actual complex structure. The stiffness matrix of the structure model is obtained by summing the stiffness matrices of the beam elements. For each typical stage of the aircraft digital assembly process, including positioning, coordinating, joining and releasing, variation models are built using the simplified structure model with respective loads and boundary conditions. Findings Using position errors and manufacturing errors as inputs, the variations for every stage of the assembly process can be calculated using the proposed model. Practical implications This method has been used in a large fuselage section assembly project, and the calculated results were shown to be a good prediction of variation in the actual assembly. Originality/value Although certain assumptions have been imposed, the proposed method provides a better understanding of the assembly process and creates an analytical foundation for further work on variation control and tolerance optimization.
      Citation: Assembly Automation
      PubDate: Fri, 24 Apr 2015 00:17:46 GMT
      DOI: 10.1108/AA-07-2014-069
       
  • Flexible tooling design technology for aircraft fuselage panel component
           pre-assembly
    • Authors: xining Li, xiaogang Dang, baoqiang Xie, yulong Hu
      Abstract: Assembly Automation, Volume 35, Issue 2, April 2015.
      Purpose The purpose of this paper is to develop digital flexible pre-assembly tooling system for fuselage panels. Design/methodology/approach The paper analyses the technological characteristics of fuselage panels firstly, and then determines the pre-assembly object. Secondly the pre-assembly positioning method and assembly process are researched. Thirdly the panel components pre-assembly flexible tooling scheme is constructed. Finally the pre-assembly flexible tooling system is designed and manufactured. Findings This study shows the novel solution results in significantly smaller tooling dimensions, while providing greater stability. Digital flexible assembly is an effective way to reduce floor space, reduce delivery and production lead times, and improve quality. Practical implications The tooling designed in this case is actually used in industrial application. The flexible tooling can realize the pre-assembly for a number of fuselage panels, which is shown as an example in this paper. Originality/value The paper suggests fuselage panel pre-assembly process based on the thought including pre-assembly, the automatic drilling & riveting and jointing, and constructs flexible tooling system for aircraft fuselage panel component pre-assembly.
      Citation: Assembly Automation
      PubDate: Fri, 24 Apr 2015 00:17:43 GMT
      DOI: 10.1108/AA-06-2014-055
       
  • Diagnosis of irregularities in the robotized part mating process based on
           contextual recognition of contact states transitions
    • Authors: Zivana Jakovljevic, Petar Petrovic, Dragan Milkovic, Miroslav Pajic
      Abstract: Assembly Automation, Volume 35, Issue 2, April 2015.
      Purpose Recognition of contact states between parts during robotized part mating represents a significant element of the system for active compliant robot motion. All proposed information machines for contact states recognition will recognize one of the possible contact states even when irregular events in the process occur, and the active motion planner will continue to send commands to robot controller according to the planned trajectory. To detect irregularities in the process, in this paper we propose a system for part mating process monitoring. Design/methodology/approach The presented framework is based on general theory of automata and formal languages. Starting from possible regular contact states transitions in part mating, we create an automaton for diagnostics which besides regular accepts all irregular (observable and unobservable) process sequences. Findings Contact states do not appear arbitrarily during regular processes, but in certain context. Theory of automata represents a solid basis for contextual recognition and diagnosis of irregularities in part mating. Research limitations/implications The proposed methodology is elaborated and experimentally verified using an example of cylindrical part mating, and stick-slip effect as an observable irregularity. The future work will address the generation of diagnosers for other types of part mating tasks and extension of the set of observable irregularities. Practical implications The process diagnosis increases the robustness of active compliant motion system. Originality/value Although very important feedback information provider for active motion planner, part mating process monitoring was not frequently addressed in the past. In this paper we propose a methodology for generation of part mating process diagnoser that is based on general automata theory.
      Citation: Assembly Automation
      PubDate: Fri, 24 Apr 2015 00:17:39 GMT
      DOI: 10.1108/AA-10-2014-077
       
  • Parts-feeding systems for assembly: macro and micro logistics
    • Authors: Maurizio Faccio et al
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.

      PubDate: Wed, 17 Dec 2014 00:49:46 GMT
      DOI: 10.1108/AA-10-2014-084
       
  • Kanban-driven parts feeding within a semi-automated O-shaped assembly
           line: a case study in the automotive industry
    • Authors: Matteo M Savino et al
      First page: 3
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose The present work is intended to provide a case study where Lean Production (LP) techniques are implemented in a semi-automated assembly line with O-shaped (closed loop) layout configuration. The action research has been conducted within an assembly line for automotive components. The work aims to provide insights on i) the impact of loop layout features with respect to lean principles application; ii) operative solutions related to some logistic limit of loop layout; iii) how kanban technique can be adapted to an O-shaped layout. Design/methodology/approach The main research methodology is based on Action Research within an assembly line of oil pumps. The two research questions find answer through i) literature analysis and ii) implementation of LP in the O-shaped layout. In the A3 step we identify the main weak points of a loop layout also under the perspective of operators’ feeling. The analysis of the main constraints is conducted in this step, with respect to the most common layout used within LP adoption. Steps A4 and A5 answer to R2 by an on-field results’ analysis. Findings The use of an O-shaped layout may allow to i) improve ergonomic conditions for workers; ii) to better organize parts feeding through slides and chutes due to the presence of operators outside the line. The new approach to determine the number of withdrawal kanban potentially extends the findings of Tardif et al (2012): The minimum of the objective function is reached with a higher number of withdrawal kanbans. Research limitations/implications The approach is applied within a stand-alone line, while in several industrial contexts we may find several of these lines in the same shop floor. In this case LP implementation would cope with i) the several kanban cards circulating, ii) the over-saturation of the logistic operator in supplying all the lines with smaller quantities of materials. Practical implications The action research resulted in the introduction of a new concept of supermarket, conceived as a decoupling buffer that lies near the line and in the review feeding devices, with the adoption of bins and operators’ feeding chutes. Parts’ feeding systems is reorganized with a two levels of withdrawal kanban. The introduction of line supermarket and the change of supply policies from pallets to bins contributed to the strong reduction of average WIP. Yet, the double withdrawal kanban and the small quantities supplied may cause an increase of material handling times and meters covered by operators. Originality/value A decoupled withdrawal kanban (DWK) is developed. In DWK, the first withdrawal is issued to the supermarket that serves the line. The second withdrawal kanban is issued from the supermarket to the central warehouse. Within DWK, we propose a modified dimensioning formula through minimization of the objective function Z(k). Parts’ feeding is now organized with sliding chutes on operators’ workstations to collect components in accordance to kanban dimensioning.
      PubDate: Wed, 17 Dec 2014 00:49:47 GMT
      DOI: 10.1108/AA-07-2014-068
       
  • Re-balancing problem for assembly lines: new mathematical model and exact
           solution method
    • Authors: Fatme Makssoud et al
      First page: 16
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose When an existing assembly line has to be adapted to new production context, the line balancing, resources allocation and component management solutions have to be revised. Design/methodology/approach This paper develops a new mathematical model and an exact solution method for an assembly line rebalancing problem with the objective to minimize the number of modifications to be done in the initial line in order to reduce the time and investments needed to meet new production requirements. Findings The computational experiments show the efficacy of the proposed method. Originality/value These reconfiguration costs were alanlysed for different part-feeding policies that can be adopted in an assembly line.
      PubDate: Wed, 17 Dec 2014 00:49:49 GMT
      DOI: 10.1108/AA-07-2014-061
       
  • A Changeover Time Reduction through an integration of lean practices: a
           case study from pharmaceutical sector
    • Authors: Filippo Emanuele Ciarapica et al
      First page: 22
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose The purpose of this paper is to uncover the significance of quick changeovers in the packaging line of a pharmaceutical company. Using an integration of different lean practices, the study aims to reduce the batch change and changeover time up to 50%, increasing OEE by 25%. Design/methodology/approach The paper gives set-up instructions and guidelines for preparing the standardized set-up procedure without ignoring the actual constraints in a pharmaceutical company. It uses a case study to generate an integrated set-up reduction approach, utilizing single-minute exchange of die tools (SMED) in combination with SIPOC, Kanban, 5S techniques and Total Productive Maintenance (TPM) indexes to achieve faster set-ups. Findings The SMED approach helps the pharmaceutical company to eliminate unwanted activities and to externalize and reduce the internal activities by simplification or standardization. The application of other tools, such as 5S and kanban tool-kits, allowed the company to optimize the process and reduce the standard deviation of the changeover times. GMP procedures (Good Manufacturing Practice) of the pharmaceutical sector limit the conversion of internal set up elements to external set up elements. Originality/value The paper demonstrates the practical application of SMED showing how it can bring real breakthroughs in productivity to a pharmaceutical company. Moreover, in this work, we highlight the importance of an integration of different lean practices to reduce variation in the changeover time. In particular, the standardization of set up tasks and the increased reliability in the material supply chain, in addition to reducing the changeover mean time can also reduce the standard deviation of the set up process time.
      PubDate: Wed, 17 Dec 2014 00:49:05 GMT
      DOI: 10.1108/AA-05-2014-035
       
  • PLANNING MODELS FOR CONTINUOUS SUPPLY OF PARTS IN ASSEMBLY SYSTEMS
    • Authors: Antonio Casimiro Caputo et al
      First page: 35
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose Analytical planning models are developed to compare JIT delivery and line storage alternatives for continuous supply of materials to assembly lines. Design/methodology/approach A mathematical model is developed to size resources and to determine total system costs. Findings The choice of assembly lines feeding policy requires a thorough economic comparison of alternatives. However, existing models are often simplistic, neglecting many critical factors which affect the systems performances. As a consequence industries are unsure about which system is best for their environment. This model allows to compare the cost and suitability of two major continuous supply alternatives in any specific industrial setting. Results of the model application are case-specific and can not be generalized. Research limitations/implications The model is aimed at single model assembly lines operating in a deterministic environment. While relevant quantitative cost drivers are included, some context-related qualitative factors are not included yet. The model assumes that information about product structure and part requirements are known and that a preliminary design of the assembly system has been carried out. Practical implications Production managers are given a quantitative decision tool to properly assess implementation of continuous material supply policies at an early decision stage, and determine which option is the best, also allowing to explore trade-offs between alternatives. Originality/value Respect previous simplified literature models, this new approach allows to quantify a number of additional factors which are critical for successful implementation of cost-effective continuous supply systems, including errors cost. No other direct comparison of line storage and JIT is available in the literature.
      PubDate: Wed, 17 Dec 2014 00:48:35 GMT
      DOI: 10.1108/AA-05-2014-040
       
  • A decision model for kitting and line stocking with variable operator
           walking distances
    • Authors: Veronique Limère et al
      First page: 47
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose Different ways of feeding assembly lines, such as kitting and line stocking, do not only have an impact on in-plant logistics flows, but also determine the amount of stock that is available at the line. This in turn has an impact on operator walking distances during assembly. A decision model is proposed to choose between kitting and line stocking at the level of single parts, while taking into account the variable operator walking distances. Design/methodology/approach A mixed integer linear programming model is developed for the assignment of parts to one of both methods, and to be able to extensively test the model an algorithm is created for the construction of representative datasets. Findings Parts are often kitted because of a space constraint at the line, but even without a space constraint the shorter walking distances might give preference to kitting. An analysis is presented that demonstrates how specific part characteristics influence the chances of a part being kitted. Research limitations/implications Our research model can be extended, to include e.g. the study of alternative in-plant logistic designs and the outsourcing of kitting to a 3PL or to the suppliers. Practical implications The objective assignment model and the insights obtained from it are valuable for logistics and production engineers that otherwise have to rely solely on intuition. In situations with thousands of components intuition mostly falls far short. Originality/value Firstly, existing models do not consider variable walking distances, which are shown to have a crucial impact on the decision. Secondly, the data instances created allow for a systematic comparison of future research in the field.
      PubDate: Wed, 17 Dec 2014 00:48:15 GMT
      DOI: 10.1108/AA-05-2014-043
       
  • Advances in assembly line parts feeding policies: a literature review
    • Authors: Huseyin Selcuk Kilic et al
      First page: 57
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose The purpose of this paper is to present a literature review on parts feeding policies and to provide the components of parts feeding systems via a classification structure. Design/methodology/approach This paper determines the scope and components of parts feeding systems via a classification structure under three main components such as the storage of parts, transport of parts and feeding policy. Afterwards, it is focused on parts feeding policies and the related papers are reviewed and analyzed according to their feeding policy types, objectives, solution methodologies and the application types. Findings A classification structure showing the components and scope of parts feeding systems is provided. Parts feeding policies are handled in detail and feeding policy types, objectives, solution methodologies and application types in the existing studies are presented in this paper. However, the paper highlights the open research areas and advances for academics and presents applied solution methodologies and case studies for practitioners. Originality/value This paper reveals the scope of parts feeding systems by presenting a classification structure including three main components and related subcomponents and provides a comprehensive literature review on parts feeding policies.
      PubDate: Wed, 17 Dec 2014 00:47:38 GMT
      DOI: 10.1108/AA-05-2014-047
       
  • A model for kitting operations planning
    • Authors: Antonio Casimiro Caputo et al
      First page: 69
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose In this paper a detailed descriptive model for kitting operations is developed allowing resources sizing and computation of systems economic performances. Design/methodology/approach A mathematical model allows to size resources given product characteristics and production mix and determines total system costs by assessing relevant cost items including investment costs (vehicles, containers, storage racks), direct operating costs (transport and kitting workforce, vehicles energy consumption and maintenance, quality costs), indirect operating costs (space requirements, WIP and safety stock holding cost, administration and control). Findings The choice of parts delivery supply to assembly lines requires a thorough economic comparison of alternatives. However, existing models are often simplistic and neglect many critical factors which affect the systems performances. As a consequence industries are unsure about which system is best for their environment. This model allows to assess the cost and suitability of kitting in any specific industrial setting. Results of the model application are case-specific and can not be generalized, but the major impact of labour and errors correction cost has been highlighted. Research limitations/implications The model at present focuses on in-house kitting systems based on travelling kits concept only. While all quantitative cost drivers are included, some context-related qualitative decision factors are not included yet. The model assumes that information about product structure and part requirements are known and that a preliminary design of the assembly system (i.e. line balancing) has been carried out. Practical implications Production managers are given a quantitative decision tool to properly assess implementation of kitting policies at an early decision stage. This allows to explore trade-offs between alternatives and properly plan the adoption of kitting systems also comparing kitting with alternative material supply methods. Originality/value Respect previous simplified literature models, this new approach allows to quantify a number of additional factors which are critical for successful implementation of cost-effective kitting systems, including kitting errors. An exhaustive cost estimation of kitting systems in multiple mixed model assembly lines is thus permitted.
      PubDate: Wed, 17 Dec 2014 00:48:24 GMT
      DOI: 10.1108/AA-02-2014-020
       
  • Robust optimization approach to production system with failure in rework
           and breakdown under uncertainty: evolutionary methods
    • Authors: Masoud Rabbani et al
      First page: 81
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose In this paper, a multi-site production planning problem with failure in rework and breakdown subject to demand uncertainty is considered. Design/methodology/approach In this new mathematical model, at first a feasible range for production time is found, and then the model the model is rewritten with considering demand uncertainty and robust optimization techniques. Here three evolutionary methods are presented: robust particle swarm optimization (RPSO), robust genetic algorithm (RGA), and robust simulated annealing (RSA) with the ability of handling uncertainties. Firstly, proposed mathematical model is validated by solving a problem in LINGO environment. Afterwards, to compare and find the efficiency of the proposed evolutionary methods, some large size test problems are solved. Findings The results show that the proposed models can prepare a promising approach to fulfill an efficient production planning in a multi-site production planning. Results obtained from comparing of three proposed algorithms, demonstrate that the presented RGA has better and more efficient solutions. Originality/value Considering Robust Optimization Approach to Production System with Failure in Rework and Breakdown under Uncertainty.
      PubDate: Wed, 17 Dec 2014 00:49:41 GMT
      DOI: 10.1108/AA-05-2014-038
       
  • Re-layout of an assembly area: a case study at Bosch Rexroth Oil Control
    • Authors: Chengyao Ren et al
      First page: 94
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose The purpose of the paper is to highlight the considerations and lessons learned from a re-layout project in an assembly area for productivity improvement. The case study took place in Bosch Rexroth Oil Control Nonantola (Italy) with satisfactory results. The paper suggests how to approach reorganization projects with focus on productivity improvements following defined targets. Design/methodology/approach After an analysis of the initial status, the authors examine several plausible layout alternatives: the main comparison criteria and their weights are defined. Then a scoring/measuring procedure follows for the criteria of each alternative, and the alternatives are compared using Principal Parameters Analysis (PPA). Findings The paper lists common considerations and lessons learned in the re-layout process. Using the Principal Parameters Analysis (PPA) the authors validate the best solution for the Company. Originality/value This paper shares a valuable experience that is general enough to be shared with many other assembly systems. An unique experience combining re-layout planning, MTM and use of Principal Parameters Analysis (PPA) is shared with the readers.
      PubDate: Wed, 17 Dec 2014 00:48:51 GMT
      DOI: 10.1108/AA-06-2014-052
       
  • A simple mechanical measurement system for the posture evaluation of wing
           components using the PSO and ICP algorithms
    • Authors: Yukan Hou et al
      First page: 104
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose Positioning is an essential process to guarantee alignment accuracy in an assembly line. The purpose of this study is to present a new and relatively inexpensive method for posture evaluation of the positioning of the wing-body assembly. Design/methodology/approach The studied method includes a structural set-up and a software algorithm used to process a set of experimental input data in order to compute the actual position of the wing with respect to the ideal position, which is proposed considering measurement uncertainty, the deviation caused by large errors in measurement points and the different tolerance requirements. Findings The studied method has been found to be simple and effective in addition to being highly accurate. Compared with most of the current methods that have been developed with optical equipment, it is more cost- and space-efficient. The automation process determines how much operation time will be saved. Practical implications The studied method has been applied in an actual assembly line, and the economic and time savings illustrate its benefits. Originality/value This method provides an attractive wing-body assembly solution for those enterprises that want to find a low-cost option or have limited measuring space for optical equipment. It can also be the basis for the accurate assembly of other large parts for aircraft and other vessels.
      PubDate: Wed, 17 Dec 2014 00:48:57 GMT
      DOI: 10.1108/AA-03-2014-025
       
  • Implementation framework for a fully flexible assembly system (F-FAS)
    • Authors: Christian Finetto et al
      First page: 114
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose Many industrial applications for small batch productions require highly flexible automated manufacturing systems. This paper aims at providing a framework for the choice, design, setup and management of a fully flexible assembly system (F-FAS). Moreover, some extensions of the F-FAS concept are provided. Design/methodology/approach The paper reviews recent findings regarding the F-FAS with a top down approach, and defines an integrated implementation framework. This framework is structured into three strictly correlated phases, and the presented procedure is organized to be readily used for new industrial applications. Practical applications are presented in order to show how the system can satisfy flexibility demands in a variety of cases. Findings The proposed framework is organized in three steps: convenience analysis of the F-FAS compared to a traditional flexible assembly system; optimal design of the feeder; choice of the setup and sequencing algorithm yielding the highest throughput. Following these steps, the F-FAS can become an effective solution for small batch productions with frequent reconfigurations. However, due to the limited throughput, the system is not well suited for large batches. Originality/value The presented framework allows to implement a F-FAS for a given industrial application, and to evaluate its efficacy with respect to other assembly technologies. Moreover, with the same implementation framework, the F-FAS concept can be applied to production fields different from assembly, as shown by the provided examples. This represents an important element of originality and of interest for its strong practical implications in different production environments.
      PubDate: Wed, 17 Dec 2014 00:49:26 GMT
      DOI: 10.1108/AA-03-2014-022
       
  • A genetic algorithm for supermarket location problem
    • Authors: Mohammed Alnahhal et al
      First page: 122
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose This paper investigates the location problem of supermarkets, feeding by material the mixed model assembly lines using tow trains. It determines the number and the locations of these supermarkets to minimize transportation and inventory fixed costs of the system Design/methodology/approach This is done using integer programming model and real genetic algorithm (RGA) in which custom chromosomes representation, two custom mating, and two custom mutation operators were proposed. Findings The performance of RGA is very good since it gives results that are very close or identical to the optimal ones in reasonable CPU time. Research limitations/implications The study is applicable only if a group of supermarkets feed the same assembly line. Originality/value For the first time in supermarket location problem, limitation on availability of some areas for possible supermarkets locations and capacity of the supermarkets were taken into consideration.
      PubDate: Wed, 17 Dec 2014 00:47:26 GMT
      DOI: 10.1108/AA-02-2014-018
       
  • New Kanban model for tow-train feeding system design
    • Authors: Marco Bortolini et al
      First page: 128
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose This paper introduces, applies and validates through a realistic case study an analytic cost model to support the design of the tow-train feeding system for mixed-model assembly lines managed according to the just-in-time concept. The fleet size and inventory level, minimizing the total annual cost, are the key model goals, while the tow-train shipping capacity and the service level are the decisional variables to set. Design/methodology/approach The model computes the material handling, inventory and stockout rising costs of the tow-train feeding system and looks for their minimization. It further computes the expected lead-time between consecutive round-trips and the Kanban card number, distinguishing among parts and assembly lines, overcoming the simplifying hypothesis assuming a constant lead-time for all parts. The model is validated against a dedicated case study stressing its strengths in terms of cost and inventory level reduction. Findings The proposed approach is found to be effective if compared to the standard literature in the field of Kanban system design. The 10.76% cost saving is experienced for the considered case study and the inventory level is closer to the field-experienced profile. Practical implications The model adopts a practical perspective making it easy applicable to common operative industries. Originality/value The literature neglects to consider the differences in the part consumption when estimating the lead-time between tow-train round-trips. The proposed model overcomes such lack strengthen the model applicability and performances.
      PubDate: Wed, 17 Dec 2014 00:49:20 GMT
      DOI: 10.1108/AA-05-2014-039
       
  • Multi-manned assembly line balancing problem with balanced load density
    • Authors: Hamid YILMAZ et al
      First page: 137
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose Most researches about the multi-manned assembly line balancing problems are focused on the conventional industrial measures that minimizing total worker, number of multi-manned workstations or both. The purpose of this paper is balancing multi-manned assembly lines with load balancing constraints in addition to conventional ones. Design/methodology/approach The paper provides a remedial constraint for the model to balance task load density for each worker in workstations. Findings Comparisons between the proposed mathematical model and existing multi-manned mathematical model show a quite promising better task load density performance for the proposed approach. Originality/value In this paper a mathematical model that combines the minimization of multi-manned stations, worker numbers and difference of task load density of workers is proposed for the first time.
      PubDate: Wed, 17 Dec 2014 00:48:31 GMT
      DOI: 10.1108/AA-05-2014-041
       
  • Order batching and time efficiency in kit preparation
    • Authors: Robin Hanson et al
      First page: 143
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose Focusing on small kit preparation areas, the purpose of this paper is to determine whether man-hour efficiency of the picking is affected by the use of batch preparation, compared to preparation of one kit at a time. Design/methodology/approach This paper is based on two experiments that were performed at a vehicle assembly plant and then analysed quantitatively. Findings The results provide a strong indication of the advantages associated with batch preparation, in terms of man hour efficiency. Practical implications The fact that the effects identified during the experiments are substantial, over 20% reduction of average time per picked component in experiment 1 and 7% in experiment 2, indicates that the option of batch picking holds potentials for large cost reduction and should be considered when kit preparation systems are designed. Originality/value Little research has dealt with the design of kit preparation systems, leaving considerable knowledge gaps. Previous research dealing with batch picking focuses other environments than kitting and on large picking areas where batching can reduce walking distances. In contrast, the current paper focuses on small picking areas, which are common in industrial kitting applications. This paper provides a considerable contribution by demonstrating improvements in time efficiency that batch preparation can offer to small picking areas in addition to larger areas. The discussion also provides a basis for future research, which could focus on aspects other than time efficiency, such as the quality of kit preparation, and variables that might moderate the effect of batching.
      PubDate: Wed, 17 Dec 2014 00:48:02 GMT
      DOI: 10.1108/AA-05-2014-046
       
  • Part-feeding with supermarket in assembly systems: transportation mode
           selection model and multi-scenario analysis
    • Authors: Daria Battini et al
      First page: 149
      Abstract: Assembly Automation, Volume 35, Issue 1, February 2015.
      Purpose The paper focuses on in-house part logistics design and management for assembly systems in which supermarket storage is adopted and coupled with an automated transportation system. In this context, this work aims to assess the transportation mode selection problem in order to speed up the preliminary design phase. Design/methodology/approach The paper is divided into two main parts. The first one provides and discusses a new conceptual framework derived from the authors’ experience in the field and from previous published works. The framework aims to support managers in problem comprehension by setting three problem sub-phases, key input parameters and qualitative guidelines without losing sight of the big picture. The second part focuses on the transportation mode selection sub-phase by assessing an analytical study followed by a multi-scenario analysis. Findings The final outcome of this work is a decision support matrix capable of setting technical guidelines that are helpful to managers and practitioners to speed up the transportation mode selection problem in the preliminary phases. Originality/value This work is beneficial for supporting managers in understanding the main decisional steps involved in the design of a part-feeding system with a supermarket by discussing the three problem sub-phases and key input parameters and providing both qualitative and quantitative guidelines. Moreover, this study explores the transportation mode selection problem, which is not yet largely explored in the published literature.
      PubDate: Wed, 17 Dec 2014 00:48:42 GMT
      DOI: 10.1108/AA-06-2014-053
       
 
 
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