Dynamic Model of Process Planning for Top-Down Collaborative Assembly Design

2008 ◽  
Author(s):  
Youdong Yang ◽  
Shuting Zhang ◽  
Zhihua Li
Keyword(s):  
Decision Making ◽  
Dynamic Model ◽  
Design Process ◽  
Process Planning ◽  
Evaluation Model ◽  
Risk Level ◽  
Global Risk ◽  
Top Down ◽  
Assembly Design ◽  
Collaborative Assembly

The design process of top-down collaborative assembly design is high parallel. There are complex task relationships not only in a task group but also among different task groups, which we call them as inside and outside relationships. A dynamic model of process planning based on hierarchical object-oriented Petri-net (HOOPN) is constructed for top-down collaborative assembly design. The dynamic model represents the outside and inside task relationships including parallel, sequential and coupling relationships. Based on the dynamic model, the dynamic supervising, analysis and decision-making for the states of the design process are implemented. The fuzzy overall evaluation model (FOEM) is utilized for risk evaluation of the design process. The task execution is influenced by local and global risk level from FOEM. Finally, the whole process planning is adjusted and controlled dynamically by the special risk decision-making mechanism.

Process Planning Dynamic Model Based on HOOPN for Top-Down Collaborative Assembly Design

2008 ◽  
Vol 44-46 ◽  
pp. 215-224
Author(s):  
Yu Dong Yang ◽  
Zhi Hua Li ◽  
Shu Ting Zhang
Keyword(s):  
Dynamic Model ◽  
Design Process ◽  
Process Planning ◽  
Petri Net ◽  
Risk Level ◽  
Global Risk ◽  
Top Down ◽  
Assembly Design ◽  
Model Based ◽  
Collaborative Assembly

According to the characteristics of the design process of top-down collaborative assembly design, process planning dynamic model based on HOOPN (hierarchical object-oriented Petri-net) is constructed for top-down collaborative assembly design. The outside and inside task dependent relationships among the task groups include parallel, sequence and coupling are implemented. The definitions of attribute for each element and the activation rules are presented for Petri-net. The fuzzy overall evaluation model is applied for risk evaluation of design process, and the local and global risk level is determined. The whole process planning is adjusted and controlled based on special risk decision-making mechanism.

The Datum Flow Chain: A Systematic Approach to Assembly Design and Modeling

1998 ◽  
Author(s):  
R. Mantripragada ◽  
D. E. Whitney
Keyword(s):  
Design Process ◽  
Systematic Approach ◽  
Assembly Planning ◽  
Assembly Process ◽  
Top Down ◽  
Assembly Design ◽  
Key Characteristics ◽  
Assembly Sequences

Abstract In order to be able to lay out, analyze, outsource, assemble, and debug complex assemblies, we need ways to capture their fundamental structure in a top-down design process, including the designer’s strategy for kinematically constraining and locating the parts accurately with respect to each other. We describe a concept called the “Datum Flow Chain” to capture this logic. The DFC relates the datum logic explicitly to the product’s key characteristics, assembly sequences, and choice of mating features, and provides the information needed for tolerance analyses. Two types of assemblies are addressed: Type-1 where the assembly process puts parts together at their prefabricated mating features, and Type-2 where the assembly process can incorporate in-process adjustments to redistribute variation. Two types of assembly joints are defined: mates that pass dimensional constraint from part to part, and contacts that merely provide support. The scope of DFC in assembly planning is presented using several examples. Analysis tools to evaluate different DFCs and select the ones of interest are also presented.

Modelling an ongoing design process utilizing top-down and bottom-up design strategies

2008 ◽  
Vol 223 (5) ◽  
pp. 547-560 ◽  
Author(s):  
M Fathianathan ◽  
J H Panchal
Keyword(s):  
Decision Making ◽  
Design Process ◽  
New Products ◽  
Dynamic Decision Making ◽  
Design Strategies ◽  
Top Down ◽  
Bottom Up ◽  
Computational Environment ◽  
Successful Design ◽  
Product Design Process

The product design process plays a central role in ensuring that new products are realized with improved quality, in a short lead-time and with costs kept to a minimum. It is identified that making decisions dynamically on how the design process should proceed is not trivial. A computational environment that aids dynamic decision making on the design process would be useful in ensuring successful design of new products. A key component of analysing and making decisions on the progression of the design process is a model that captures an ongoing design process. In this paper, an approach to modelling an ongoing design process is proposed based on the use of design nodes. The approach allows an ongoing design process to be modelled that facilitates dynamic decision making on how the design process should progress and accounts for the state of the design problem. The approach allows top-down and bottom-up design strategies to be modelled.

Mechanical systems and assemblies modeling using knowledge-intensive Petri nets formalisms

2001 ◽  
Vol 15 (2) ◽  
pp. 145-171 ◽  
Author(s):  
X.F. ZHA ◽  
H. DU
Keyword(s):  
Petri Nets ◽  
Design Process ◽  
Mechanical Systems ◽  
Object Oriented ◽  
Hybrid Design ◽  
Object Model ◽  
Top Down ◽  
Assembly Design ◽  
Knowledge Based ◽  
Knowledge Intensive

This paper presents a novel knowledge-based Petri net approach to mechanical systems and assemblies modeling within a design with objects environment. A new unified class of object-oriented knowledge Petri nets, which can incorporate a knowledge-based system with ordinary Petri nets, is defined and used for the unified representations of assembly design and modeling. The object knowledge Petri nets, as a graphical language and a new knowledge-based description scheme, can be used to express the qualitative and quantitative aspects of the assembly design and modeling process in an interactive and integrated way. The four-level hierarchy model is proposed and constructed in terms of function-behaviors, structures, geometries, and features. The function-behavior-structure description is built on more abstract concepts so that it can match well top-down design. The static and dynamic characteristics in the design of assembly can also be captured. With the help of fuzzy logic, the incomplete, imprecise knowledge and uncertainty in the design process can also be dealt with. Therefore, the hybrid design object model can incorporate product data model, top-down design process, and assembly process model using an object-oriented, knowledge-based, feature-based, parametric, and constraint-based modeling approach, and can provide a more accurate and more flexible representation. To verify and demonstrate the effective use of the proposed hybrid design object model, a prototype system has been developed. This research provides a knowledge-intensive framework for intelligent assembly design and modeling.

scholarly journals 3210 Design Process Planning Method with Attainment-based Evaluation Model

2008 ◽  
Vol 2008.18 (0) ◽  
pp. 488-493
Author(s):  
Yutaka NOMAGUCHI ◽  
Daisuke TSUTSUMI ◽  
Kikuo FUJITA
Keyword(s):  
Design Process ◽  
Process Planning ◽  
Evaluation Model ◽  
Planning Method
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