Constraint ratio in product assembly planning

1997 ◽  
Vol 13 (6) ◽  
pp. 401-406 ◽  
Author(s):  
Ip-shing Fan ◽  
Chi-kuang Liu
Keyword(s):  
Assembly Planning ◽  
Product Assembly ◽  
Constraint Ratio

Object-oriented design of product assembly feature data requirements in advanced assembly planning

2018 ◽  
Vol 38 (1) ◽  
pp. 97-112 ◽  
Author(s):  
Mahmood Reza Khabbazi ◽  
Jan Wikander ◽  
Mauro Onori ◽  
Antonio Maffei
Keyword(s):  
Product Design ◽  
Object Oriented ◽  
3D Models ◽  
Assembly Planning ◽  
Content Type ◽  
Assembly Design ◽  
Assembly Features ◽  
Assembly Feature ◽  
Product Assembly ◽  
Data Requirements

Purpose This paper introduces a schema for the product assembly feature data in an object-oriented and module-based format using Unified Modeling Language (UML). To link production with product design, it is essential to determine at an early stage which entities of product design and development are involved and used at the automated assembly planning and operations. To this end, it is absolutely reasonable to assign meaningful attributes to the parts’ design entities (assembly features) in a systematic and structured way. As such, this approach empowers processes such as motion planning and sequence planning in assembly design. Design/methodology/approach The assembly feature data requirements are studied and definitions are analyzed and redefined. Using object-oriented techniques, the assembly feature data structure and relationships are modeled based on the identified requirements as five UML packages (Part, three-dimensional (3D) models, Mating, Joint and Handling). All geometric and non-geometric design data entities endorsed with assembly design perspective are extracted or assigned from 3D models and realized through the featured entity interface class. The featured entities are then associated (used) with the mating, handling and joints features. The AssemblyFeature interface is realized through mating, handling and joint packages related to the assembly and part classes. Each package contains all relevant classes which further classify the important attributes of the main class. Findings This paper sets out to provide an explanatory approach using object-oriented techniques to model the schema of assembly features association and artifacts at the product design level, all of which are essential in several subsequent and parallel steps of the assembly planning process, as well as assembly feature entity assignments in design improvement cycle. Practical implications The practical implication based on the identified advantages can be classified in three main features: module-based design, comprehensive classification, integration. These features help the automation and solution development processes based on the proposed models much easier and systematic. Originality/value The proposed schema’s comprehensiveness and reliability are verified through comparisons with other works and the advantages are discussed in detail.

Automated Initial-Population Generation for Genetic-Algorithm-Based Assembly Planning

2000 ◽  
Author(s):  
Gregory C. Smith ◽  
Shiang-Fong Chen
Keyword(s):  
Genetic Algorithm ◽  
State Of The Art ◽  
Assembly Planning ◽  
Initial Population ◽  
Search Efficiency ◽  
Assembly Sequence ◽  
Assembly Sequences ◽  
Component Assembly ◽  
Product Assembly ◽  
Initial Assembly

Abstract Genetic algorithms show particular promise for automated assembly planning. As a result, several recent research reports present genetic-algorithm-based mechanical-product assembly planners. However, genetic-algorithm-based assembly planners require an initial assembly-sequence population, and search efficiency greatly depends upon input-population quality. State-of-the-art genetic-algorithm-based assembly planners use one of two techniques for generating an initial assembly-sequence population: use a user-supplied assembly-sequence set or use a randomly generated assembly-sequence set. Generating a user-supplied initial population requires a substantial amount of manpower. Using a randomly generated initial population reduces search efficiency. As a result, we propose an algorithm for automatically generating an initial assembly-sequence population. Our algorithm calculates component assembly complexity and uses both component assembly complexity and component connectivity to automatically generate a valid assembly-sequence population. Using automatically generated initial populations, we achieve search efficiencies comparable to search efficiencies achieved when using user-supplied initial assembly-sequence populations, while eliminating manpower required to generate user-supplied assembly sequences.

scholarly journals Haptic-enabled virtual planning and assessment of product assembly

2020 ◽  
Vol 40 (4) ◽  
pp. 641-654 ◽  
Author(s):  
Enrique Gallegos-Nieto ◽  
Hugo I. Medellin-Castillo ◽  
Yan Xiu-Tian ◽  
Jonathan Corney
Keyword(s):  
Execution Time ◽  
Performance Metrics ◽  
Objective Assessment ◽  
Virtual Assembly ◽  
Automatic Generation ◽  
Product Development Process ◽  
Assembly Planning ◽  
Assembly System ◽  
Content Type ◽  
Product Assembly

Purpose This study aims to present a new haptic-enabled virtual assembly system for the automatic generation and objective assessment of assembly plans. The system is intended to be used as an assembly planning tool along the product development process. Design/methodology/approach The generation of product assembly plans is based on the analysis of the assembly movements and operations performed by the user during the virtual assembly execution, and the objective assessment of product assembly is based on the definition and computation of new proposed assembly metrics. Findings To evaluate the system, a case study corresponding to the assembly of a mechanical component is presented and analyzed. The results demonstrate that the proposed system is an effective tool to plan and evaluate different product assembly strategies in a more practical and objective approach than existing assembly planning methods. Research limitations/implications Although the virtual assembly execution time is larger than the real assembly execution time, the assembly planning and evaluation results provided by the system are valid. However, the development of higher performance collision detection algorithms is needed to reduce the simulation time. Originality/value The proposed virtual assembly system is able to not only simulate and automatically generate assembly plans but also objectively assess them from the virtual assembly task execution. The introduction and use of several assembly performance metrics to objectively evaluate assembly strategies in virtual assembly also represents a novel contribution.

A Graph Based Heuristic Approach to Automated Assembly Planning

1994 ◽  
Author(s):  
Xue Yan ◽  
P. Gu
Keyword(s):  
Automatic Generation ◽  
Heuristic Approach ◽  
Assembly Sequence Planning ◽  
Robotic Assembly ◽  
Assembly Planning ◽  
Assembly Sequence ◽  
Product Model ◽  
Disassembly Sequence ◽  
Feature Based ◽  
Product Assembly

Abstract Automatic generation of product assembly sequence is essential for robotic assembly task planning. In this paper, a graph-based heuristic approach is presented for assembly sequence planning. A product is represented in feature-based product model. A liaison graph is then formed based on assembly relations among components. The liaison graph is split into two or more pieces by removing the cutvertex from the graph. The pieces may also be split again until basic graph(bi-connected graph) are found. The basic graphs are considered as sub-assemblies. The disassembly sequence for each sub-assembly is determined. The disassembly sequences are then merged to generate a complete disassembly sequence for the product. Finally, the assembly sequence is defined by reversing the complete disassembly sequence.

Barcode-Based Service-Oriented Material Flow Technology for Complex Product Assembly

2014 ◽  
Vol 667 ◽  
pp. 93-97 ◽  
Author(s):  
Xue Zhen ◽  
Ai Min Wang ◽  
Rui Cheng Fan ◽  
Jian Zhou
Keyword(s):  
Flow Control ◽  
Material Flow ◽  
Assembly Planning ◽  
Prototype System ◽  
Loop Control ◽  
Complex Product ◽  
Service Oriented ◽  
Material Flow Control ◽  
Product Assembly ◽  
Oriented Material

Aiming at the demand for timelines, effectiveness and retroactivity in the complex product assembly, this paper puts forward a kind of barcode-based material flow control technology. This technology regards the idea of complete kit as guide which, on one hand, puts forward a closed loop control mechanism including rapidly kitting pallet preparation, field scan confirmation and retrospective statistical distribution service-oriented material flow control. On the other hand, this paper puts forward a material complete kit which forms a complete set technology of assembly planning driven. This paper realized the dispatch of correct material in the correct time and in the correct way. This paper forms a process-oriented material trace statistics technology and solves the classification statistical issues of material status and location. Finally, this paper develops a prototype system and then the effectiveness of the technology was verified.

Augmented tangible interfaces for product assembly planning

2006 ◽  
Vol 1 (3) ◽  
pp. 321 ◽  
Author(s):  
Ronald Sidharta ◽  
James Oliver ◽  
Adrian Sannier
Keyword(s):  
Assembly Planning ◽  
Tangible Interfaces ◽  
Product Assembly

Structural Analysis of Product and Computer-Aided Assembly Planning in AssemBL Software Package

2018 ◽  
pp. 11-33
Author(s):  
A. N. Bozhko
Keyword(s):  
Computer Aided Design ◽  
State Of The Art ◽  
Graph Model ◽  
Design System ◽  
Assembly Planning ◽  
Complex Products ◽  
Assembly Sequences ◽  
Computer Aided ◽  
Cad Cam ◽  
Aided Design

Computer-aided design of assembly processes (Computer aided assembly planning, CAAP) of complex products is an important and urgent problem of state-of-the-art information technologies. Intensive research on CAAP has been underway since the 1980s. Meanwhile, specialized design systems were created to provide synthesis of assembly plans and product decompositions into assembly units. Such systems as ASPE, RAPID, XAP / 1, FLAPS, Archimedes, PRELEIDES, HAP, etc. can be given, as an example. These experimental developments did not get widespread use in industry, since they are based on the models of products with limited adequacy and require an expert’s active involvement in preparing initial information. The design tools for the state-of-the-art full-featured CAD/CAM systems (Siemens NX, Dassault CATIA and PTC Creo Elements / Pro), which are designed to provide CAAP, mainly take into account the geometric constraints that the design imposes on design solutions. These systems often synthesize technologically incorrect assembly sequences in which known technological heuristics are violated, for example orderliness in accuracy, consistency with the system of dimension chains, etc.An AssemBL software application package has been developed for a structured analysis of products and a synthesis of assembly plans and decompositions. The AssemBL uses a hyper-graph model of a product that correctly describes coherent and sequential assembly operations and processes. In terms of the hyper-graph model, an assembly operation is described as shrinkage of edge, an assembly plan is a sequence of shrinkages that converts a hyper-graph into the point, and a decomposition of product into assembly units is a hyper-graph partition into sub-graphs.The AssemBL solves the problem of minimizing the number of direct checks for geometric solvability when assembling complex products. This task is posed as a plus-sum two-person game of bicoloured brushing of an ordered set. In the paradigm of this model, the brushing operation is to check a certain structured fragment for solvability by collision detection methods. A rational brushing strategy minimizes the number of such checks.The package is integrated into the Siemens NX 10.0 computer-aided design system. This solution allowed us to combine specialized AssemBL tools with a developed toolkit of one of the most powerful and popular integrated CAD/CAM /CAE systems.

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