Process Operators and Their Roles in Integrated Assembly Process Planning

1998 ◽  
Author(s):  
Zhi-Kui Ling ◽  
XiangYu Zhou ◽  
Chuck Mclean
Keyword(s):  
Process Planning ◽  
Physical Simulation ◽  
Resource Planning ◽  
Assembly Sequence Planning ◽  
Assembly Process ◽  
Assembly Sequence ◽  
Assembly Process Planning ◽  
Sequence Planning ◽  
Assembly Design ◽  
Assembly Simulation

Abstract An environment to facilitate assembly process planning is proposed in this study. It includes a design support system with two agents supporting the assembly process. One is assembly design agent, and the other is a geometric design agent. The assembly design agent consists of three modules: the assembly sequence planning module, the assembly resource planning module, and the assembly simulation module. The assembly sequence-planning module takes the design information and generates an assembly sequence. This sequence is structured in a tree form, called the Constructive Assembly Tree (CAT). The leaf nodes of the tree correspond to the components of the product. The intermediate nodes are the assembly process operators, each of which characterizes a particular assembly operation, and their associated subassemblies. The resource module assigns the necessary tools, fixtures, supply bins and other resources to each of the process operators. The assembly simulation module traverses a CAT, extracts the necessary assembly information, and drives external physical simulation/animation system to perform virtual assembly simulation/animation process.

Optimizing assembly sequence planning using precedence graph-based assembly subsets prediction method

2019 ◽  
Vol 40 (2) ◽  
pp. 361-375 ◽  
Author(s):  
Nan Zhang ◽  
Zhenyu Liu ◽  
Chan Qiu ◽  
Weifei Hu ◽  
Jianrong Tan
Keyword(s):  
High Efficiency ◽  
Prediction Method ◽  
Solution Space ◽  
Assembly Sequence Planning ◽  
Selection Strategy ◽  
Assembly Process ◽  
Assembly Sequence ◽  
Content Type ◽  
Sequence Planning ◽  
Precedence Graph

Purpose Assembly sequence planning (ASP) plays a vital role in assembly process because it directly influences the feasibility, cost and time of the assembly process. The purpose of this study is to solve ASP problem more efficiently than current algorithms. Design/methodology/approach A novel assembly subsets prediction method based on precedence graph is proposed to solve the ASP problem. The proposed method adopts the idea of local to whole and integrates a simplified firework algorithm. First, assembly subsets are generated as initial fireworks. Then, each firework explodes to several sparks with higher-level assembly subsets and new fireworks are selected for next generation according to selection strategy. Finally, iterating the algorithm until complete and feasible solutions are generated. Findings The proposed method performs better in comparison with state-of-the-art algorithms because of the balance of exploration (fireworks) and exploitation (sparks). The size of initial fireworks population determines the diversity of the solution, so assembly subsets prediction method based on precedence graph (ASPM-PG) can explore the solution space. The size of sparks controls the exploitation ability of ASPM-PG; with more sparks, the direction of a specific firework can be adequately exploited. Practical implications The proposed method is with simple structure and high efficiency. It is anticipated that using the proposed method can effectively improve the efficiency of ASP and reduce computing cost for industrial applications. Originality/value The proposed method finds the optimal sequence in the construction process of assembly sequence rather than adjusting order of a complete assembly sequence in traditional methods. Moreover, a simplified firework algorithm with new operators is introduced. Two basic size parameters are also analyzed to explain the proposed method.

Research on Aircraft Assembly Sequence Planning Technology Based on Key Characteristics

2013 ◽  
Vol 328 ◽  
pp. 9-16 ◽  
Author(s):  
Zhan Lei Sun ◽  
Peng Fei Han ◽  
Gang Zhao
Keyword(s):  
Process Design ◽  
Assembly Sequence Planning ◽  
Assembly Process ◽  
Assembly Sequence ◽  
Assembly Quality ◽  
Constraint Matrix ◽  
Aircraft Assembly ◽  
Sequence Planning ◽  
Key Characteristics ◽  
Assembly Sequences

Assembly Sequence Planning (ASP) is an essential question for aircraft assembly process design. Modern aircraft assembly contains plenty of complex shape components, which have so many assembly features to ensure, this leads to a large number of feasible assembly sequences using traditional sequence planning algorithms; and it is hard to evaluate the contribution to assembly quality for every sequence. A methodology called Key Characteristics Based ASP is proposed in this paper, which can significantly reduce unavailable sequences and ensure key features for quality in assembly process designing compared with previous methods. The methodology focuses on the final assembly quality and considers it as Assembly Key Characteristics (AKCs) in the beginning of assembly process design. With tools such as AKCs decomposition, Datum Flow Chain, precedence constraint matrix, the methodology describes the main process for ASP. To verify the technologys effectiveness, this paper presents an application of the algorithm in an aircraft component assembly by an 863 program.

The Two Phased Method of Hull Block Assembly Sequence Planning

2011 ◽  
Vol 421 ◽  
pp. 235-239
Author(s):  
Shi Peng Qu ◽  
Zu Hua Jiang
Keyword(s):  
Constraint Satisfaction ◽  
Constraint Satisfaction Problem ◽  
Assembly Sequence Planning ◽  
Assembly Process ◽  
Assembly Model ◽  
Assembly Sequence ◽  
Hierarchical Assembly ◽  
Sequence Planning ◽  
Whole Process ◽  
Block Based

A hull block assembly sequence planning (ASP) problem is modeled as a constraint satisfaction problem where the precedence relations between operations are considered constraints. In order to generate the proper assembly sequence of the hull block, we analyzed the structure features of the block and built the hierarchical assembly model of the block. Based on this model, we divided the whole process of the block assembly into the small subassembly phase and the unit subassembly phase. There exists the rule that the assembly process of the subassembly in the same phase is similar, and it's different to the subassembly in the different phases. So, we proposed the different methods to plan the assembly sequence of the different phases. An example is given to illustrate that this two phased method can solves the block ASP problem effectively and accurately.

An interference discrimination method for assembly sequence planning and assembly simulation

2020 ◽  
Vol 40 (4) ◽  
pp. 541-552
Author(s):  
Wenlei Zhang ◽  
Mingxu Ma ◽  
Haiyan Li ◽  
Jiapeng Yu ◽  
Zhenwei Zhang
Keyword(s):  
Collision Detection ◽  
Assembly Sequence Planning ◽  
Zone Model ◽  
Assembly Sequence ◽  
Polygonal Approximation ◽  
Content Type ◽  
Sequence Planning ◽  
Assembly Simulation ◽  
Verification Methods ◽  
Polygonal Models

Purpose The purpose of this paper is to discriminate fake interference caused by polygonal approximation so as to achieve accurate assembly sequence planning and assembly simulation. Design/methodology/approach An approximation zone model is proposed to formulate polygonal approximation. Fake interference is discriminated from hard interference by evaluating if polygonal models intersect within corresponding approximation zones. To reduce the computation, the surface-surface, surface-end face and end face-end face intersection test methods have been developed to evaluate the intersection and obtain collision data. An updated collision detection algorithm with this method is presented, which is implemented by a system named AutoAssem. Findings This method has been applied to a set of products such as a valve for assembly interference matrix generation, static and dynamic collision detection. The results show that it ensures the accuracy of assembly sequence planning and assembly simulation for polygonal models. Practical implications This method facilitates assembly design in the virtual environment with polygonal models. It can also be applied to computer aided design systems to achieve quick and accurate collision detection. Originality/value Fake interference between polygonal models may result in serious errors in assembly sequence planning and assembly simulation. Assembly zone model and novel polygon intersection verification methods have been proposed to effectively tackle this problem. Compared to current methods, this method considers valid penetration direction and approximation difference, does not need to process complicated auxiliary data and can be easily integrated with current collision detection methods.

Study on Visual Assembly Process Planning System Based on 3DVIA Composer

2011 ◽  
Vol 179-180 ◽  
pp. 734-739 ◽  
Author(s):  
Lei Chen ◽  
Ming Ran Deng ◽  
Zheng Feng Jiang
Keyword(s):  
Process Planning ◽  
Process Model ◽  
Three Dimensional ◽  
Application Programming Interface ◽  
Planning System ◽  
Assembly Process ◽  
Three Dimensional Model ◽  
Assembly Process Planning ◽  
Assembly Simulation ◽  
Process Planning System

Errors often occur in the assembling process because traditional two-dimensional process cards are lack of three-dimensional realistic in assembling site. Aimed at this problem, a visual assembly process planning system is proposed, which turns assembly process into assembly animation on the basis of three-dimensional model on the platform of 3DVIA Composer. This System combines assembly process planning with assembly simulation, and then realizes the assembly process related to three-dimensional process model and assembly animation and assembly process visualization in assembling site by the application programming interface provided by 3DVIA Composer. The system has been applied to some aircraft parts manufacturing enterprise, and then obviously shortens assembling time and guarantees assembling quality.

Assembly Sequence Planning for Aircraft Component Based on Improved Clashes Matrix

2011 ◽  
Vol 88-89 ◽  
pp. 22-28 ◽  
Author(s):  
Liu Ying Yang ◽  
Gang Zhao ◽  
Bin Bin Wu ◽  
Guang Rong Yan
Keyword(s):  
Genetic Algorithms ◽  
Objective Function ◽  
Evaluation Criteria ◽  
Assembly Sequence Planning ◽  
Assembly Process ◽  
Assembly Sequence ◽  
Sequence Planning ◽  
Aircraft Cabin ◽  
Aircraft Component ◽  
Interference Matrix

The aircraft parts contain the information of a great number of curves and surfaces, which makes it a big challenge for the aircraft components’ Assembly Sequence Planning (ASP) processes. The traditional interference matrix has limitation of expressing the assembly direction and can easily lead to the failure of ASP optimization. Hence, an improved interference matrix is provided in this paper to deal with the aircraft ASP problem based on the Genetic Algorithms (GA). With the mainly consideration of assembly time according to the assembly sequence evaluation criteria, the objective function is established and evaluated. This paper presents an application of the method in the aircraft cabin door assembly process supported by an 863 program. Meanwhile, the verification of the approach is shown in the practical example on MATLAB platform.

Process Knowledge Integrated Assembly Sequence Planning for Control Panel

2020 ◽  
Vol 14 (1) ◽  
pp. 6-17
Author(s):  
Atsuko Enomoto ◽  
Noriaki Yamamoto ◽  
Yoshio Yamamura ◽  
Yoshio Sugawara ◽  
◽  
...  
Keyword(s):  
Assembly Sequence Planning ◽  
Control Panel ◽  
Assembly Process ◽  
Assembly Sequence ◽  
Automated Assembly ◽  
Process Knowledge ◽  
Sequence Planning ◽  
Sequence Generation ◽  
Assembly Sequence Generation

Completely automated assembly sequence planning for control panels is proposed. The proposed algorithm generates the manufacturing bill of material for the assembly processes and total assembly sequence. The algorithm integrates the knowledge of assembly process into a near optimum assembly sequence generation.

Assembly Simulation and Analysis of Dynamic to Ingoter Based on Pro/E

2012 ◽  
Vol 601 ◽  
pp. 158-162
Author(s):  
Xiu Fen Xu
Keyword(s):  
Assembly Sequence Planning ◽  
Dynamic State ◽  
Kinetic Simulation ◽  
Assembly Sequence ◽  
Sequence Planning ◽  
Assembly Simulation ◽  
Simulation Based

In order to prove the rationality and correctness of assembly sequence planning to ingot of aluminum caster, it established model of assembly simulation based on Pro/E. The interference information of static and dynamic state is gained. At the same time, the rationality and correctness of assembly sequence planning is proved. The feasibility of scheme is proved by checking some parameters in system. it provides an important reference for further analysis kinetic simulation

Assembly sequence planning: A Review

2020 ◽  
Vol 13 ◽  
Author(s):  
Han-Ye Zhang
Keyword(s):  
Artificial Intelligence ◽  
Process Planning ◽  
Assembly Sequence Planning ◽  
Future Research ◽  
Assembly Process ◽  
Assembly Sequence ◽  
Knowledge Based ◽  
Design And Manufacturing ◽  
Artificial Intelligence Algorithm ◽  
Assembly Operations

Background: Assembly process planning (ASP) is the important stage in the process of product design and manufacturing. A reasonable assembly sequence can reduce the complexity of assembly operations, reduce the number of tools and fixtures, improve the assembly efficiency, reduce the assembly time, and reduce assembly costs. Methods: The purpose of this paper is to review the objective function, constraint conditions, and the solving methods of the ASP. Conclusion: The research methods can be roughly divided into three categories: graph-based method, knowledge-based method, and artificial intelligence algorithm, and the advantages and advantages of the three methods are compared. Finally, future research is discussed which could provide reference for the ASP.

A hybrid technology for assembly sequence planning of reflector panels

2017 ◽  
Vol 37 (4) ◽  
pp. 442-451 ◽  
Author(s):  
Dou Wang ◽  
Xiaodong Shao ◽  
Xiaobo Ge ◽  
Simeng Liu
Keyword(s):  
Finite Element ◽  
Fitness Function ◽  
Assembly Sequence Planning ◽  
Engineering Practice ◽  
Assembly Process ◽  
Assembly Sequence ◽  
Content Type ◽  
Sequence Planning ◽  
Simulation Results ◽  
Optimal Approach

Purpose The purpose of this study is to guarantee assembly quality and reduce the number of manufacturing cycles required for an reflector of the large reflector antenna. An optimal approach combining a finite element method (FEM) with a genetic algorithm (GA) is developed to simulate and optimize reflector assembly before the assembly stage. Design/methodology/approach The chromosomes of GA are encoded with the consideration of the factors that affect the assembly of reflector. The fitness function of the GA consists of the assembly accuracy obtained from simulation, with evaluation of the assembly time consumption and labor cost. The algorithm will terminate when the GA is finished or the simulation results meet the permissible accuracy. Taking the assembly process of the reflector into account, an FEM based on a “life – death element” technique is introduced to quickly and precisely simulate reflector assembly. Findings A case study is presented, to which the proposed approach is applied. The results of finite element simulation demonstrate that the proposed FEM can simulate the reflector assembly process with oversimplified modeling and accurate simulation results. The optimal approach provides an accurate and efficient method for reflector assembly sequence planning indicated by the comparison of the measurements and calculation results. Originality/value The results also demonstrate that the proposed approach has practical significance for guiding reflector assembly in engineering practice.

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