Thèses : « Assembly planning system »

1

Kitano, Akira. « A prototype computer-aided assembly planning system ». Thesis, Massachusetts Institute of Technology, 1990. http://hdl.handle.net/1721.1/14059.

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Yang, Fan. « DISCRETE COMPLIANT MOTION PLANNING SYSTEM FOR ROBOTIC ASSEMBLY ». Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/195237.

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This dissertation focuses on compliant motion planning designed for robotic assembly. A Discrete Complaint Motion Planner (DCMP) reacts to detected discrete contact state transitions and issues compliant motion command to the underlying continuous robot system. It consists of a Qualitative Contact Model, a Compliant Motion Strategy Planner (CMSP) and a Compliant Motion Command Planner (CMCP).How to model and characterize a contact state is a major issue. In this dissertation, contact states are described using the qualitative configuration representation called Feature Interaction Matrix (FIM). A FIM encodes not only the contact information but also the relative configuration between two polyhedral parts. This FIM-based qualitative contact state model has several contributions: 1) an optimization-based approach is developed to verify the hypothetical states in FIM; 2) penetration check for hypothetical contact states through constraint satisfaction is simple and fast; 3) spatial adjacency can be easily determined using convex cone techniques; 4) a generate-and-test method is proposed to expand qualitative states in FIM; 5) compliant motion parameters are derived by an optimization method.The qualitative contact states and how they are connected is modeled with an adjacency graph/sub-graph, where nodes represent qualitative contact states and spatially adjacent contact states are connected by arcs. Each arc represents a desired contact state transition. The CMSP receives contact state transition event from an on-line estimator, then computes/checks the assembly strategy and issues the next desired contact state transition to the CMCP. The compliant motion strategy is computed using graph-search techniques with the automatic construction of the adjacency graph/sub-graph. The CMSP integrate hypotheses generation, hypotheses verification, spatial adjacency and graph search algorithms.When the next desired contact state transition is received, the CMCP computes the compliant motion parameters that are issued to the underlying continues robot system to achieve the desired contact state transition. The generation of motion parameters is defined as an optimization problem and an algorithm is developed to solve it.The DCMP in this dissertation considers both 3D translational and 3D rotational motions. Experiments are carried out to demonstrate the feasibility of the approach for the automatic assembly of polyhedral parts.

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Shukri, Mohamed Ibrahim. « Computer-aided analysis and planning of a flexible assembly system ». Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315366.

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Das, Sanchoy K. « Selection of an optimal set of assembly part delivery dates in a stochastic assembly system ». Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/45640.

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The scheduling of material requirements at a factory to maximize profits.or productivity is a difficult mathematical problem. The stochastic nature of most production setups introduces additional complications as a result of the uncertainty involved in vendor reliability and processing times. But in developing the descriptive model for a system, a true representation can only be attained if the variability of these elements is considered.

Here we present the development of a normative model based on a new type of descriptive model which considers the element of stochasticity. The arrival time of an assembly part from a vendor is considered to be a normally distributed random variable. We attempt to optimize the system with regard to work-in-process inventory using a dynamic programming algorithm in combination with a heuristic procedure. The decision variable is the prescribed assembly part delivery date. The model is particularly suitable for application in low volume assembly lines, where products are manufactured in discrete batches.

Master of Science

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Johansson, Matilda, et Robin Sandberg. « How Additive Manufacturing can Support the Assembly System Design Process ». Thesis, Tekniska Högskolan, Högskolan i Jönköping, JTH, Industriell organisation och produktion, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-30887.

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In product manufacturing, assembly approximately represents 50% of the total work hours. Therefore, an efficient and fast assembly system is crucial to get competitive advantages at the global market and have the right product quality. Today, the verification of the assembly system is mostly done by utilizing software based simulation tools even though limitations have been identified. The purpose of this thesis is to identify when the use of additive manufacturing technology could be used in assessing the feasibility of the assembly system design. The research questions were threefold. First, identifying limitations that are connected with the used assembly simulation tools. Secondly, to investigate when additive manufacturing can act as a complement to these assembly simulations. Finally, to develop a framework that will assist the decision makers when to use additive manufacturing as a complement to assembly simulations. The researchers used the method of case study combined with a literature review. The case study collected data from semi-structured interviews, which formed the major portion of the empirical findings. Observations in a final assembly line and the additive manufacturing workshop provided valuable insights into the complexity of assembly systems and additive manufacturing technologies. In addition, document studies of the used visualization software at the case company resulted in an enhanced understanding of the current setting. The case study findings validate the limitations with assembly simulations described in theory. The most frequent ones are related to visibility, positioning, forces needed for the assembly operator, and accessibility between different parts. As both theory and case study findings are consistent in this respect, simulation engineers should be conscious of when to find other methods than simulation for designing the assembly system. One such alternative method is the utilization of additive manufacturing. The thesis outlines a number of situations where additive manufacturing indeed could act as a complement to assembly simulation. The authors argue that the results and findings to a large degree are applicable to other industries as the automotive sector is very global and competitive in nature and encompasses a large variety of complex assembly operations. A structured framework was also developed that could act as a decision support. The framework takes into account three dimensions that are crucial for the decision; (1) the assembly simulation limitation, (2) the context of the assembly and which parts are involved and (3) the possible limitations of additive manufacturing in the specific context. This impartial decision framework could help companies with complex assembly systems to know when to use additive manufacturing, as well as for which parts and subparts additive manufacturing is applicable. To increase the longevity of the decision framework, new improvements of assembly simulation tools and additive manufacturing technologies, respectively, should be incorporated in the framework.

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Hansson, Tengberg Henrik, et Andreas Adlerborn. « Design of an Assembly System at AERCRETE INDUSTRIES ». Thesis, Jönköping University, Jönköping University, JTH, Industrial Engineering and Management, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-10742.

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The forming of an assembly system is a complex task, which should be considered as never ending. In order to successfully plan and implement an assembly system it is of vital importance that the obstacles and preconditions that have an impact on the system are identified and evaluated. This together with the necessary support activities and the attributes of the product to be assembled constitutes the starting point for the forming of the assembly system.

The aim of this thesis is to link the theoretical findings with the issues stated above, and through this explain a best practice approach when forming the assembly system. The theoretical work aims at describing the nature and activities within assembly and manufacturing systems and explains these in three different levels of strategies divided into Manufacturing strategies, Layout, material flow and design strategies and finally Logistic, material handling and quality strategies. Then the obstacles and preconditions found are discussed and evaluated which set the basis for the forming of the assembly system and by linking these with the relevant theory, conceptual design proposals for the assembly system and the Logistic support system are formed.

These are then evaluated and finally a proposal for the detailed layout of the assembly system is given. This proposal is then to be used as a guideline for the company Aercrete when forming their assembly system.

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Bonert, Martin. « Motion planning for multi-robot assembly systems ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0004/MQ45428.pdf.

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Nguyen, Dang Tan. « Entwicklung eines effizienten Montageplanungssystems auf Basis von Funktionsfolgen ». Universitätsverlag Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A33551.

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Die gängige Methodik zum Konzipieren automatisierter Montagesysteme umfasst die Planung der Montage und die physische Entwicklung der technischen Gesamtlösung. Zur Abbildung der konkreten Aufgabe werden standardisierte Symbole in einem Ablaufplan miteinander verknüpft. Die Hauptaufgabe des Konstrukteurs ist die Auswahl und die Zusammenstellung einer optimalen Konfiguration der Funktionsträger sowie deren Implementierung in einer Gesamtlösung unter Berücksichtigung der vorgegebenen Randbedingungen. Das Problem ist der fehlende Informationsgehalt der bisher eingesetzten Handhabungssymbole und Symbole zur Ermittlung der Funktionsträger zur Beschreibung der Montage- und Handhabungsplanung sowie die fehlende Vorgehensweise zur Auswahl der Funktionsträger aus den verschiedenen Varianten nach minimaler Taktzeit und Gesamtanschaffungskosten. Zur Realisierung eines effizienten Montageplanungssystems leitet sich daher die Zielstellung ab, den Informationsgehalt der standardisierten Symbole zu erweitern und mit logischen Schnittstellen für eine automatisierte Verknüpfung in der Funktionsfolge auszustatten. Diese neuen Symbole beinhalten die Definition der Funktionen sowie alle Randbedingungen und Parameter zur eindeutigen Beschreibung der Handhabungsaufgabe. Mithilfe dieser Parameter werden Anforderungslisten erstellt und nach passenden Anlagenkomponenten gesucht. Zur Auswahl der optimalen Komponenten des Montagesystems wird das lineare Optimierungsproblem hinsichtlich der Kombination aus Taktzeit und Gesamtanschaffungskosten gelöst.
The common methodology for designing automated assembly systems involves the assembly planning and the physical development of overall technical solution. To illustrate the concrete task, standardized symbols are connected together in a flowchart. The designer's main task is the selection and the composition of an optimal configuration of the functional carriers as well as their implementation in an overall solution in consideration of the predetermined boundary conditions. One problem is the lack of information content of the previously used handling symbols and the symbols for determining the functional carriers, which describe the assembly and handling planning. The other is the insufficient methods for selecting the functional carriers from the different variants based on minimum cycle time and total acquisition cost. In order to realize an efficient assembly planning system, the objective is therefore to expand the information content of the standardized symbols and equip them with logical interfaces for automated connection in the functional sequence. These new symbols contain the definition of the functions as well as all boundary conditions and parameters for the unambiguous description of the handling task. These parameters are utilised to create requirement lists and search for suitable plant components. In order to select the optimal components of the assembly system, the linear optimization problem regarding the combination of cycle time and total acquisition costs is solved.

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Khalil, Eiad. « Intelligent planning and control of multi-assembly systems ». Thesis, Sheffield Hallam University, 2008. http://shura.shu.ac.uk/19909/.

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The global trend towards cost minimisation in manufacturing has intensified during the last two decades. Cost reduction can be achieved either, directly, through elimination of waste, or indirectly, through optimisation of production processes and generating more reliable information regarding the costs incurred. The research presented in this thesis considers cost reduction in three aspects: optimisation of production processes, accurate cost estimation and accounting. Due to the increasing number of combinatorial optimisation problems associated with the production of Printed Circuit Boards (PCB), it has attracted the attention of many researchers who tried to solve these problems with the aim of minimising the production cost. Therefore, PCB production is used in this research as a test-bed for the three aspects mentioned above. Regarding cost reduction in PCB manufacturing, three interrelated combinatorial optimisation problems are considered: the component placement sequencing problem, the feeder assignment problem and the board type sequencing problem. Solving these problems ensures cost reduction by reducing the time required for manufacturing PCBs. As for cost reduction in the costing and accounting aspects, the traditional standard costing and standard accounting have some problems that make them unsuitable for today's manufacturing. Standard costing allocates overhead to labour or machine hours, which leads to a distortion of product costs due to the fact that today's manufacturing relies more on technology and less on human power. As for standard accounting, it has some features and characteristics that contradict with the widely spread lean manufacturing. The deficiencies in standard costing and standard accounting may create more waste and lead to the wrong decisions being taken. A framework is developed to provide solution to the above-mentioned problems in an integrated environment. A mathematical formulation for the three PCB manufacturing-related problems is developed and solved using a metaheuristic-based algorithm. In order to deal with the costing and accounting part of the framework developed, Activity Based-Costing (ABC) and Lean Accounting (LA) are implemented on a PCB manufacturing facility using a case study. ABC is used to estimate the costs of manufacturing PCBs and provide detailed information on how the costs are incurred. As for LA, it is used to reduce the costs associated with the accounting system, which is achieved by eliminating and/or replacing accounting transactions and promoting lean measures. Simulation results obtained show an average reduction in total assembly time of 5.96% and 5.43% when Taboo Search (TS) and Genetic Algorithms (GA) metaheuristics are used respectively. The results also show how ABC can be used to identify the activities used in PCB manufacturing and calculate their costs. By targeting the most costly activities identified by ABC, the production costs can be reduced. Regarding LA, the results indicate how the accounting system costs can be reduced by eliminating some accounting transactions and processes or replacing them with less costly alternatives.

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Byrne, Carlton B. « Assembly task identification and strategy development using expert systems and neural networks ». Thesis, Cardiff University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.266650.

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Lanham, John Denis. « An integrated approach to the design of flowline based assembly systems ». Thesis, University of the West of England, Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265051.

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Sutanto, Agus. « Solution approaches for planning of assembly systems in three-dimensional virtual environments / ». Bamberg : Meisenbach, 2005. http://deposit.ddb.de/cgi-bin/dokserv?id=2650819&prov=M&dok_var=1&dok_ext=htm.

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Bajic, Mirko M. « Design of dynamic cellular manufacturing systems ». Title page, abstract and contents only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phb165.pdf.

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Bibliography: leaves 172-184. An analytical approach to the integrated problems of designing the dynamic cellular manufacturing systems layout concurrently with its material flow (handling) requirements, in such a manner that minimises the material handling within the system. The proposed strategy encourages the design of a dynamic layout to identify simultaneously the machine groups, economical machine distribution, and intracell and intercell layouts.

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Cao, Nan, et 曹楠. « Investigation of RFID-enabled walking-worker assembly islands with fixed-position layouts ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B50162779.

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This research investigates a metallurgy manufacturer whose products are assembled on fixed position assembly islands. The products of collaborating company are characterized by large-scale with high complexity and mass customization. With such configuration, a product is always set on one location throughout its whole assembly cycle. Assembly materials, machines and operators can be continuity sent to one location to reduce damage or movement cost. To understand the production challenges of a real-life enterprise, this research investigates production procedures of the collaborating enterprise on planning, scheduling, logistics and assembly. The management challenges of assembly method with fixed-position layout are summarized as: (1) High dynamic of material, tools and operator movement. (2) The movement of operators, assembly machines maybe expensive. (3) The requirements of assembly operators are too high to find suitable operators with low cost. The cause of current production problems of the collaborating enterprise are summarized as: (1) lack of appropriate real-time operation data capturing and collection methods (2) current visibility and traceability functions at shop floor is wasteful, time consuming and inaccuracy (3) production data can hardly be synchronized between different production unites, e.g. assembly island buffers and stock areas. Hence RFID technology is applied to solve the problems. The creation of RFID-enable assembly environment is following the AUTOM RFID implementation solutions. The methodology of deployment RFID hardware facilities and the functions of choosing production object to tag RFID tags, finding value-adding points to deploy RFID readers and building networks to integrate the RFID hardware facilities are introduced. Decision support system is developed to connect and transfer information between shop-floor execution and decision. This system guides executions and collects real-time information involved in execution procedures and converts the information as reference for decision makers. This system can also release shop-floor decisions instantly to operators. Four core components including Explorers, Modules, Services and Data repository compose the framework. These four components interrelates to each other to guarantee the smooth shop-floor information transformation. Finally, a case study demonstrates the RFID solution has been successfully deployed in proof-of-concept shop floor of the collaborating enterprise. The decision support system can proper manage the captured real-time information and convert the information into useful reference data for decision makers. As the operation processes of this case is designed strictly following the real-life operation processes, therefore this RFID solution is capable to be applied in real-life shop floor to assist the enterprise operation and management.
published_or_final_version
Industrial and Manufacturing Systems Engineering
Master
Master of Philosophy

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Tumbare, Nina. « An internal communication assessment of the Lilongwe City Assembly ». Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2509.

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Thesis (MA (Public and Development Management))--University of Stellenbosch, 2009.
Internal communication has the potential of improving the ability of local authorities to deliver effective and efficient basic services. Local authorities are the pillar upon which governments rely to champion the decentralisation process which has been widely hailed as enabling service delivery to the communities. The Lilongwe City Assembly recognises the need to address internal communication issues, but have neither carried out any meaningful analysis of its internal communication nor has it developed an internal communication plan or guidelines. The communication audit methodology is relatively unknown in the public sector in Malawi and it is hoped that this study brings to light the advantages of giving organisational communication its deserved role in activities of the public sector. It is hoped that this study would be replicated in the remaining 38 local assemblies with a view to improving service delivery. This study assessed the internal communication of the Assembly as part of a broader perspective of organisational communication. Specifically, it measured the effectiveness of internal communication at the Lilongwe City Assembly. The methodology involved measuring the perceived current and ideal amounts of information in eight fundamental areas of internal communication, namely receiving information from others, sending information to others, action on information sent, channels of communication, communication relationships, communication and work satisfaction, timeliness of information received from key sources and sources of information. Findings from a sample of 186 respondents of the Assembly indicated a great need to receive information and to interact with Assembly management more frequently than what is happening currently. The communication between subordinates and co-workers seems to be satisfactory. However, the majority of respondents expressed the need to engage with Assembly management on a number of key issues, including staff welfare, salaries and benefits. In addition, a concern about the inability of employees to master the English language was cited as reducing the capacity of the Assembly to fully implement its work activities.
cmc2010

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Betts, John Maurice 1960. « Just-in-time replenishment and component substitution decisions for assemble-to-order manufacturing when capital is investor-supplied ». Monash University, School of Business Systems, 2002. http://arrow.monash.edu.au/hdl/1959.1/9361.

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Kucukkoc, Ibrahim. « Modelling and solving mixed-model parallel two-sided assembly line problems ». Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/18917.

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The global competitive environment and the growing demand for personalised products have increased the interest of companies in producing similar product models on the same assembly line. Companies are forced to make significant structural changes to rapidly respond to diversified demands and convert their existing single-model lines into mixed-model lines in order to avoid unnecessary new line construction cost for each new product model. Mixed-model assembly lines play a key role in increasing productivity without compromising quality for manufacturing enterprises. The literature is extensive on assembling small-sized products in an intermixed sequence and assembling large-sized products in large volumes on single-model lines. However, a mixed-model parallel two-sided line system, where two or more similar products or similar models of a large-sized product are assembled on each of the parallel two-sided lines in an intermixed sequence, has not been of interest to academia so far. Moreover, taking model sequencing problem into consideration on a mixed-model parallel two-sided line system is a novel research topic in this domain. Within this context, the problem of simultaneous balancing and sequencing of mixed-model parallel two-sided lines is defined and described using illustrative examples for the first time in the literature. The mathematical model of the problem is also developed to exhibit the main characteristics of the problem and to explore the logic underlying the algorithms developed. The benefits of utilising multi-line stations between two adjacent lines are discussed and numerical examples are provided. An agent-based ant colony optimisation algorithm (called ABACO) is developed to obtain a generic solution that conforms to any model sequence and it is enhanced step-by-step to increase the quality of the solutions obtained. Then, the algorithm is modified with the integration of a model sequencing procedure (where the modified version is called ABACO/S) to balance lines by tracking the product model changes on each workstation in a complex production environment where each of the parallel lines may a have different cycle time. Finally, a genetic algorithm based model sequencing mechanism is integrated to the algorithm to increase the robustness of the obtained solutions. Computational tests are performed using test cases to observe the performances of the developed algorithms. Statistical tests are conducted through obtained results and test results establish that balancing mixed-model parallel two-sided lines together has a significant effect on the sought performance measures (a weighted summation of line length and the number of workstations) in comparison with balancing those lines separately. Another important finding of the research is that considering model sequencing problem along with the line balancing problem helps algorithm find better line balances with better performance measures. The results also indicate that the developed ABACO and ABACO/S algorithms outperform other test heuristics commonly used in the literature in solving various line balancing problems; and integrating a genetic algorithm based model sequencing mechanism into ABACO/S helps the algorithm find better solutions with less amount of computational effort.

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Sutanto, Agus [Verfasser], Klaus [Akademischer Betreuer] Feldmann, Klaus [Gutachter] Feldmann, Michael [Gutachter] Zäh, Manfred [Herausgeber] Geiger et Klaus [Herausgeber] Feldmann. « Solution Approaches for Planning of Assembly Systems in Three-Dimensional Virtual Environments / Agus Sutanto ; Gutachter : Klaus Feldmann, Michael Zäh ; Betreuer : Klaus Feldmann ; Herausgeber : Manfred Geiger, Klaus Feldmann ». Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2005. http://d-nb.info/1200211006/34.

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Han, Yong-Hee. « Dynamic Sequencing of Jobs on Conveyor Systems for Minimizing Changeovers ». Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4877.

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This research investigates the problem of constrained sequencing of a set of jobs on a conveyor system with the objective of minimizing setup cost. A setup cost is associated with extra material, labor, or energy required due to the change of attributes in consecutive jobs at processing stations. A finite set of attributes is considered in this research. Sequencing is constrained by the availability of two elements ??orage buffers and conveyor junctions. The problem is motivated by the paint purge reduction problem at a major U.S. automotive manufacturer. First, a diverging junction with a sequence-independent setup cost and predefined attributes is modeled as an assignment problem and this model is extended by relaxing the initial assumptions in various ways. We also model the constrained sequencing problem with an off-line buffer and develop heuristics for efficiently getting a good quality solution by exploiting the special problem structure. Finally, we conduct sensitivity analysis using numerical experiments, explain the case study, and discuss the use of the simulation model as a supplementary tool for analyzing the constrained sequencing problem.

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LYU, Shao-Ren, et 呂紹任. « Intelligent KBE system for assembly sequence planning ». Thesis, 2009. http://ndltd.ncl.edu.tw/handle/28379050088160941570.

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碩士
中華大學
機械工程學系碩士班
97
The purposed research is to build an intelligent KBE system for assembly sequence planning (ASP) .The knowledge-driven concept of product design is a novel trend of current computer aided design (CAD) system, knowledge-based engineering (KBE) can be an integrated processing technology, which merges the original engineering design experiences, design achievements and domain know-how, fulfills the connections with CAX (CAD/CAM/CAE/CAPP/CAI) system via the knowledge reuse, and further reduces the workloads of product development and promptly boosts the design efficiencies. Therefore, the purposed research joins back-propagation neural network (BPNN) algorithm and UG NX/KF second development module to create feasible assembly sequences. System user can easily access the volume, weight and feature number through NX system, and input the related parameters such as contact relationship number and total penalty value, and predict the feasible assembly sequence via a robust BPNN engine. In addition, the existing system can demonstrate the explosion views and vivid assembly simulations, save the entire assembly information, and setup a splendid knowledge base. Finally, the study apply the toy car model as a learning (training) sample and toy motorbike model, real-world brushless DC fan as testing and verified samples. The results show that the proposed model can efficiently generate BPNN engines, facilitate assembly sequence optimization and allow the designers to recognize the contact relationships, assembly difficulties and assembly constraints of three-dimensional (3D) components in a virtual environment type.

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Chern, Chin Hwah, et 陳金華. « Computer Aided Assembly System Design and Planning ». Thesis, 1994. http://ndltd.ncl.edu.tw/handle/81453548321915914556.

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碩士
中原大學
工業工程研究所
82
There are always many assembly tasks in the process of product manufacturing, and we can use automatic equipments to reduce the cost of manufacturing, improve throughput and get some other profit. If we design assembly system with computer, the time for designing will reduce, and the quality of results will raise. In this research,a framework about the designing of assembly system with computer is proposed. First, we select a proper assembly system to decide delivery method of parts and assembly method. After that, we do the first phase, to made assembly time short and to make the system have good balance efficiency. When the first phase has been done, we excute the second phase to decide what kinds of robot and feeder that assembly tasks should use. Finally, this research take the assembly of automobile as an example, to explain the use of this research and to prove its practicability.

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劉開成. « Establishment of automatic assembly planning system with feedback capability ». Thesis, 1993. http://ndltd.ncl.edu.tw/handle/29418673423803056309.

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Cheng, Liou Kai, et 劉開成. « Establishment of Automatic Assembly Planning System with Feedback Capability ». Thesis, 1993. http://ndltd.ncl.edu.tw/handle/90024034162257065334.

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碩士
國立臺灣科技大學
工程技術研究所
81
Due to the board use of the computer recently, the computer- aided design (CAD) software has been wildly used in the design of products. Consequently,the auto-mation of assembly planning system is also expected to be achieved by the instrumentality of CAD. The purpose of this paper is to implement an automatic assembly system which takes the CAD descripts as input and automatically generates feasible assembly sequences. This system can also feedback revelant messages during the operation of assembly planning in order to provide some reference to the designer on what should be redesigned. Based on the feedback message , the designer is capable of redesigning the required components to comply with the aim of design for assembly. At the same time, from the process of computer simulation, the designer can understand the characteristics of assembly and need not to produce and assemble this product virtually. Thus, we can not only put the consideration of assembly into our design process, but reduce the demand and the modification of the prototype to lessen the initial cost of the fabrication.

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Chang, Ting-Shih, et 張廷謚. « Development of an Assembly Planning System Using Creo Toolkit ». Thesis, 2019. http://ndltd.ncl.edu.tw/handle/3xpsz3.

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碩士
國立臺灣科技大學
機械工程系
107
With the rapid application of manipulators, automated assembly lines are relying on multiple manipulators and various types of fixtures. Although the assembly lines nowadays are fully automated, there are still plenty of setups that need to be taken care, such as assembly sequence planning, path planning, grasping points, and so on. This thesis establishes a Creo Toolkit-based assembly planning system, which can generate feasible assembly sequences and assembly paths so as to reduce the time of pre-processing. The basic idea is to find the possible exploded directions of the part to be assembled, which can be extracted from the part’s planar surfaces and axes, and then confirm the feasibility by the ray tracing technique for every single possible exploded direction, so as to generate the exploded sequence and exploded path of the part. An exploded drawing is next automatically established through the output results. Afterwards, the data from the exploded drawing is acquired to build the animation of assembly simulation and Epson manipulator assembles all the components in the sequence. Besides elaborating on the analysis of assembly sequence and path planning based on the 3D CAD model, this thesis also uses drill, caliper, table lamp, motorcycle’s front fork and various assemblies as examples to verify the practicability of the developed system.

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Chien, Ming-Hung, et 簡銘宏. « The Development of Computer Aided System Design for Flexible Assembly System Planning ». Thesis, 1996. http://ndltd.ncl.edu.tw/handle/40253388346413776292.

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碩士
大葉工學院
工業工程研究所
84
The flexibility of an assembly system is its ability to assemble differe nt products and to be switched over to new tasks. Flexible systems can a ssemble a wide spectrum of products, thus leading to profitable investment , while simultaneously providing the possibility for flexible product develop ment. This paper presents a computer aided system design for flexible assem bly. First, the flexibility of an assembly system is addressed from the vie wpoints of product, process and system. The techniques for planning flexible assembly systems are thus developed. A parameter matching method as well as open structure is used for assembly system and equipment selection. In addi tion, a Japanese U-type production line concept is introduced for flexible assembly line planning. Furthermore, a computer aided system structure is dev eloped for flexible assembly system design. Three modules are included in the system, they are: assembly system selection module, assembly equipment selection module, and assembly line planning module. Each of the module s processes the input data automatically through its planning procedure an d condition examination; therefore increases the efficiency and quality in flexible assembly system design. Finally, an engine assembly system is ad opted for illustrating and validating the system functions in the computer a ided design and planning of flexible assembly systems.

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TAI, PEI-HAO, et 戴培豪. « A Knowledge-Based Engineering System for Integral Assembly Sequence Planning ». Thesis, 2009. http://ndltd.ncl.edu.tw/handle/42203602470957292159.

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博士
中華大學
科技管理學系(所)
97
Research in assembly planning can be categorized into three types of approach: graph-based, knowledge-based and artificial intelligence approaches. The main drawbacks of the above approaches are as follows: the first is time-consuming; the second approach is difficult to find the optimal solution; and the third approach requires a high computing efficiency. To tackle these problems, this study develops a three-stage approach (i.e., firstly create a correct CAD-oriented explosion graph and then find a graph-based assembly sequence using Above graph, relational model graph and assembly precedence diagram; at last, generating a feasible assembly sequence) integrated with robust back-propagation neural network (BPNN) engines via Taguchi method and design of experiment (DOE), and a knowledge-based engineering (KBE) system to assist the assembly engineers in promptly predicting a near-optimal assembly sequence for mechanical or plastic products. The research focuses on building a novel KBE system for assembly sequence planning (ASP), which joins BPNN predictor and Siemens NX/KF second development module together to create feasible assembly sequences. System user can easily access the volume, weight and feature number through Unigraphics NX system interface, and input the related parameters such as contact relationship number and total penalty value, and predict the feasible assembly sequence via a robust BPNN engine. Furthermore, the proposed system can demonstrate the explosion views and vivid assembly simulations, save the entire assembly information, and setup a consolidate knowledge base. Finally, three real-world examples- the toy car model as a learning (training) sample, toy motorbike model and a brushless DC fan as verifying (testing) samples, are dedicated to evaluating the feasibility of the proposed KBE system in terms of the differences in assembly sequences. The results show that the proposed model can efficiently generate robust BPNN engines, facilitate feasible assembly sequences and allow the designers to recognize the contact relationships, assembly difficulties and assembly constraints of three-dimensional (3D) components in a virtual environment type.

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Tsai, Ruei-Ci, et 蔡睿綺. « The Work Effectiveness Evaluation of a Manual Assembly Planning and Layout by Using Virtual Assembly System ». Thesis, 2008. http://ndltd.ncl.edu.tw/handle/43405605826820203569.

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碩士
中原大學
工業工程研究所
96
Virtual reality has the features of providing immersion and interaction. This technology can be widely used in studies of ergonomics to discuss the interaction between personnel and the system in order to aid the design of work. To enhance the communication between the product design and manufacturing, the restrictions of workplace must be taken into consideration in initial product design stage. This study built a human-machine interactive system that combined interactive features of virtual reality to assess work effectiveness in manual assembly work, to discuss whether different parts location would affect workers’ judgment on assembly sequence. The layout of assembly work and the locations of parts in this study mainly designed by considering movement, economic layout and general principles, but the solution of planning the layout of the parts of is not the only feasible solution. The location of layout affects operator’s memory of assembly sequence and the continuity of action. Thus, this study discussed the effect of different layout of assembly workplace on operators’ performance by studying the interaction between user and virtual assembly system. The virtual assembly system consists of four models: virtual prototyping model, assembly layout model, interaction control model and data access model. Researcher imported the information of the assembly layout into the virtual assembly system and the user tested the assembly work though the assembly system. The system recorded the assembly time of each step and the accuracy of operations. The purpose of this study is to develop an effective assessment of work effectiveness of assembly workplace layout, in order to return the performance indicators to the designer and analyze which layout can assist operator in assembly work most effectively. By building a case of vehicle assembly parts, we planed two assembly operations according to different principles of layout. The experiment results found that use the frequency-of-Use principle of layout planning mainly have a higher accuracy of operations in this case. The verification results showed that the system has the ability to examine the difference of work effectiveness on different assembly workplace layout, and examine the effect on workplace layout which planned according to different layout planning principles. It can build a comprehensive virtual assembly system in the future by combining other assessment tools about the accessibility, the human cognition of the assembly work, and the workers’ posture, etc.

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Huang, Ping-Hao, et 黃秉豪. « An Ant Colony System for Solving Connector-Based Assembly Planning Problems ». Thesis, 2005. http://ndltd.ncl.edu.tw/handle/95302311643982357360.

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碩士
大葉大學
工業工程與科技管理學系
93
Products assembly can be defined as a task in which components are turned into a final product according to specific assembly sequence. Rembold et al. (1985) once mentioned that product-assembly cost occupie up to 50% of the total manufacturing cost. Working out an optimal assembly sequence is, therefore, an important issue for modern enterprises. This research uses an ant colony algorithm to solve connector-based assembly sequence. Connectors that are equipped with assembly engineering information (combination, direction, tool) serve as the basic unit to replace the traditional way where only parts are taken into consideration. Under the constraints of connector’s precedence graph, similarity between connectors is used to arrange assembly tasks. Based upon the research of Tseng et al.(2004), the degree of complexity in assembly planning can be effectively reduced. In the case of larger constraint assembly problem, genetic algorithms will generate a larger number of infeasible solutions in the evolution procedure, thus reducing the efficiency of the solution-searching process. In the past, Chang Y. H.(2004) proposed a guided-based genetic algorithm to solve this problem. In this study, guided-based genetic algorithm is used to be a bench mark for comparison. Finally, practical examples were offered to verify the feasibility of ant colony algorithm-based approach.

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Wei, Shih-chung, et 魏士忠. « A Pilot Study on Production Planning for a Machine Tool Assembly System ». Thesis, 2017. http://ndltd.ncl.edu.tw/handle/32892892375750932755.

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碩士
國立交通大學
管理學院工業工程與管理學程
105
Originated from a real case, this research investigates the production planning in the machine tool assembly systems, particularly intends to develop a decision support system to enhance the decision quality. This is a pilot study to address the issues. We analyze and summarize the critical characteristics of the machine tool assembly systems and its management requirements. We develop a mathematical programming model for task-operator assignment and job sequencing so that the total lateness of all orders is minimized and workload is balanced among operators. The empirical study based on real data show that the model developed can play as a core engine for the production planning system in the future.

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ZHENG, GUANG-RUI, et 鄭光瑞. « Motion planning for multiple cooperative robot arms its application to robotic assembly system ». Thesis, 1991. http://ndltd.ncl.edu.tw/handle/79660026328192417300.

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Shieh, Shiang-Hung, et 謝相宏. « Sensor-based Motion Planning for a Multi-Robot System with Their Application to Robotic Assembly ». Thesis, 1993. http://ndltd.ncl.edu.tw/handle/37497757109241859438.

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Chiang, Hung-peng, et 江宏鵬. « Developing an Improved Genetic Algorithm for the Production System Design with Assembly Planning and Machine Layout ». Thesis, 2009. http://ndltd.ncl.edu.tw/handle/2uc2hq.

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碩士
國立臺北科技大學
工業工程與管理研究所
97
For a production system that incorporates Assembly Planning and Machine Layout which often are investigated. This research constructs an optimal mathematical model. Its object is to minimize cycle time of each order and minimize total idle time of the production line. Besides, this research offers a Multi-parent Improvement Genetic Algorithm (MpI-GA) to solve the mathematical model effectively. Based on operations of order, MpI-GA determines operation assignment in turn. It also calculates multi-parent crossover that is expected to gain a better planning in a short time. In conclusive, this research compares MpI-GA with traditional Genetic Algorithms (GA) using two designed experiments. The experimental results demonstrate effectiveness of proposed MpI-GA in designing production system.

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HUANG, ZHAO-MIN, et 黃兆民. « The design of short-term production planning for flexible assembly systems ». Thesis, 1991. http://ndltd.ncl.edu.tw/handle/92110772464279770456.

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ZHENG, SHU-HUA, et 鄭淑華. « The production planning for assembly & ; flexible manufacturing systems in Make-to-order companies ». Thesis, 1991. http://ndltd.ncl.edu.tw/handle/50633672025617690489.

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