Research On The Key Technologies Of Process Integration For Aeroengine Product Development

The process integration management is the certain trend and the strategicdemand of modern advanced manufacture technique. It considers the whole productlifecycle with the idea of concurrent, eliminates the redundant activities andsub-process and others resulted by person and resource, realizes the wholeoptimization and integrates the applications to run as a system harmoniously.The integrated management idea of the aeroengine product developmentprocess is proposed according to its characteristics: complex work process, abundantactivities, many enterprises, long period, etc. The integration architecture, processmodeling and the execution service of aeroengine product development process areanalyzed based on workflow technique, and its integration management is realized.According to the special requirements proposed by the process integration ofaeroengine product development, several key technologies are studied in detail toaccelerate the use of workflow technique in it:(1) The integration architecture of aeroengine product development process isanalyzed based on the workflow technique, and the modeling method, the executionservice are emphasized for the integration of aeroengine product developmentprocess.(2) There are many iterative processes in aeroengine product design whichrequire the cooperation of many activities. In order to solve the coordinationproblem, a flexible execution mechanism of workflow is proposed which is based onthe idea of concurrent engineering. In this mechanism, an anticipation idea inFlexible Execution of Workflow is deepened and a method of data sharing isproposed. This method of data sharing allows the preceding activity to share itsintermediate results (IRs) with the succeeding activity and vice versa, so thesucceeding activity can use the IRs of the preceding activity to start earlier, and thepreceding activity can use the IRs of the succeeding activity as feedback to makesome modification quickly. Our method can improve parallel execution ability ofactivities and realize the coordination of activities in the iterative process.(3) An operation collection about the workflow dynamic change is definedbased on the Co_flow prototype system, and the method used to check thecorrectness and completeness of the dynamic change operation is presented. Accord to the strategy of case transfer and product development logic, a case transfercriterion based on the process semantic logic is proposed, which emphasizes thecase keeping an equivalent process logic after it is transferred. Aimed at theexception problem of case transfer, a concept of dynamic change exceptionregion(DCER) is present, and the method of computing DCER is put forward. If acase includes an element in DCER, it can not transfer from the old model to the newmodel. The method to solve the transfer of exception case is proposed.(4) According to the requirement of data management in the process ofaeroengine product development, a concept of general version is proposed that usesthe design state as the basic unit to organize general version, and the correspondinggeneral version management model is built. In this model, the data structure isanalysed and graph is adopted to describe the relation model of the general versions.In order to emphasize the design history and the inherited relation among the generalversions, a method of managing general versions is proposed, which is based on thegeneral version graph. In order to reflect the knowledge included in the versions, amethod is proposed which extracts knowledge from a version and manages ittogether with the version object.(5) The research about flexible execution mechanism and dynamic change ofworkflow is validated with the development process of aeroengine blade, and theprototype system of general version management for aeroengine parts is introducedat the end of this thesis.