Search

The design of assembly tooling is located downstream of the aircraft design during the production of the aircraft, which is affected by the design of aircraft parts and the limitation of aircraft production preparation cycle. Its design time is urgent and the task is heavy. Traditional aircraft assembly tooling is mainly expressed in the form of text and two-dimensional drawings, and the information is static, which results in the lack of unique data sources, low efficiency and poor accuracy of collaborative change management of aircraft-assembly tooling. In view of the above problems, a collaborative change method of aircraft-assembly tooling is proposed. Based on the model based definition (MBD), the relationship framework of aircraft and assembly tooling MBD models is established. Referring to related change propagation calculation method, the active and automatic prediction and the analysis of the influence of aircraft design change on assembly tooling change are realized. The feasibility of the method is verified by an example of an assembly tooling change design for an aircraft panel opening frame. [ABSTRACT FROM AUTHOR]

Agent technology is regarded as an effective approach for manufacturing system modeling, and it is widely used in manufacturing job shop scheduling. In the job shop scheduling based on contract net protocol, repeated negotiations are required and the problem of concurrent-tendering operation emerges. To increase working efficiency of contract net protocol, the protocol is simplified and an improved contract net protocol based on cycle period is proposed. The protocol deals with the tender orderly, and introduces the threshold value into the negotiations, which limits the bidding price. Finally, the experiments based on multi-agent job shop AGV scheduling validate the effect of the improved contract net protocol based on cycle period. [ABSTRACT FROM AUTHOR]