A hierarchical Petri net framework for the representation and analysis of assembly

“…To capture the hierarchical nature of assembly planning, Thomas et al (1996) propose a hierarchical PN framework, where each control plan corresponding to an assembly robot operation is viewed as a lower level representation of assembly tasks at the higher level. Adamous et al (1998) introduce a hierarchical model of flexible assembly system control using object PNs, which is built on hierarchical decomposition of the system through coordination among lower level decomposed system elements.…”

Section: Related Workmentioning

confidence: 99%

Nested coloured timed Petri nets for production configuration of product families

Zhang¹,

Rodrigues

2009

International Journal of Production Research

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Production configuration is as an effective technique to deal with product variety while maintaining production stability and efficiency. It involves a diverse set of process elements (e.g., machines, operations), a high variety of component parts and assemblies and many constraints arising from product and process variety. Production configuration entails the selection and subsequent arrangement of process elements into complete production processes and the final evaluation of configured multiple alternatives. To better understand production configuration and its implementation, we study the underlying logic for configuring production processes using a dynamic modelling and visualisation approach. This is accomplished by developing a new formalism of nested coloured timed Petri nets (PNs). In view of the inherent modelling difficulties, in the formalism three types of nets -process nets, assembly nets and manufacturing nets -together with a nested net system are defined. Using an industrial example of vibration motors, we show how the proposed formalism can be applied to specify production processes at different levels of abstraction to achieve production configuration.

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“…2. Assembly modeling for assembly and task planning: Thomas et al (1996a) classify the commonly used assembly modeling methods for task planning into two categories.…”

Section: Task-specific Assembly Modelsmentioning

confidence: 99%

Complex assembly variant design in agile manufacturing. Part I: System architecture and assembly modeling methodology

Ai-hu¹,

Koç²,

Nagi³

2005

IIE Transactions

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In the distributed and horizontally integrated manufacturing environment found in agile manufacturing, there is a great demand for new product development methods that are capable of generating new customized assembly designs based on mature component designs that might be dispersed at geographically distributed partner sites. To cater for this demand, this paper addresses the methodology for complex assembly variant design in agile manufacturing. It consists in fundamental research in two parts: (i) assembly modeling; and (ii) assembly variant design methodology. This paper, the first of a two-part series, presents the assembly variant design system architecture and the assembly modeling methodology. First, a complementary assembly modeling concept is proposed with two kinds of assembly models, the hierarchical assembly model and the relational assembly model. The first explicitly captures the hierarchical and functional relationships between constituent components whereas the second explicitly captures the mating relationships at the form-feature-level. These models are complementary in the sense that each of them models only a specific aspect of assembly-related information but together they include the required assembly-related information. They are further specialized to accommodate the features of assembly variant design. As a result, two kinds of assembly models, the assembly variants model and the assembly mating graph are generated. These assembly models serve as the basis for assembly variant design which is discussed in the companion paper.

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A hierarchical Petri net framework for the representation and analysis of assembly

Cited by 40 publications

References 17 publications

Fair BPEL processes transaction using non-repudiation protocols

Fair BPEL processes transaction using non-repudiation protocols

Nested coloured timed Petri nets for production configuration of product families

Complex assembly variant design in agile manufacturing. Part I: System architecture and assembly modeling methodology

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