On constraints in assembly planning

Unification of the a priori inconsistencies checking among assembly constraints in assembly sequence planning

Sequence planning generation is an important problem in assembly line design. A good assembly sequence can help to reduce the cost and time of the manufacturing process. This paper focuses on assembly sequence planning (ASP) known as a hard combinatorial optimization problem. Although the ASP problem has been tackled via even more sophisticated optimization techniques, these techniques are ofte...

Biologic constraints on modelling virus assembly

The mathematic modelling of icosahedral virus assembly has drawn increasing interest because of the symmetric geometry of the outer shell structures. Many models involve equilibrium expressions of subunit binding, with reversible subunit additions forming various intermediate structures. The underlying assumption is that a final lowest energy state drives the equilibrium toward assembly. In the...

On Assembly Sequence Planning using Petri Nets

Petri nets have been proposed as a suitable tool for expressing precedence constraints and computing assembly sequences. Motivations for using Petri nets stem from their clear and well-deened semantics as well as from the formal analysis tools and techniques available. In this paper the operation and properties of Petri net models representing assembly plans are reconnected to the fundamental p...

Research on Knowledge-Based Virtual Assembly Planning

In order to find an optimum assembly sequence in engineering design domain, a knowledge-based virtual assembly approach was put forward. Virtual assembly design environment was also introduced, and knowledge representation models for virtual assembly rules and cases are introduced and studied respectively. A side-center virtual assembly method was applied to avoid the occurrence of assembly int...

Symmetry inference in planning assembly