Research On MBD-based Collaborative Change Technology For Aircraft-assembly Tooling

The development of modern aircraft is the most complex technology and requires the highest quality in the aviation industry.Its economic influence is also the largest and “National Medium-and Long-term Science and Technology Development Plan(2006-2020)” makes the development of large aircraft as one of the sixteen major scientific and technological projects,which are strived to be handled in the next fifteen years.The rapid development of the aviation industry puts forward higher requirements of production preparation to cope with fierce market competition.In the development of modern aircraft,development mode of digital parallel collaboration occupies an important position.And MBD(model based definition)technology,as a new computer application-oriented technology for digital definition of product,is able to integrate all the development information of aircraft products.It provides a way for the development of digital parallel cooperation of aircraft products,and can greatly improve the efficiency of production preparation of aircraft.As the most complex tooling in the production preparation of aircraft,assembly tooling accounts for a large proportion of aircraft production preparation.Assembly tooling development is limited by design of upstream aircraft product,collaborative execution of different stages of assembly tooling development,and production preparation cycle of aircraft.In the development mode of digital parallel collaboration,on one hand,assembly tooling design and aircraft design are required to be executed in parallel.However,from the pre-release to the design finalization of aircraft,its design is changed frequently,which can cause the assembly tooling to be modified frequently.On the other hand,the design and manufacture of assembly tooling are demanded to be executed in parallel,which further exacerbate the impact of engineering change on assembly tooling.The engineering changes can seriously affect the cycle shortening and cost reduction of the aircraft development.Therefore,this thesis studies the MBD model of aircraft and assembly tolling with a collaborative definition mode,relational model of multiple structures based on MBD model,relation between aircraft and assembly tooling,relation between assembly tooling parts,change propagation process,development of auxiliary system and so on.The objective is to study the change propagation prediction and influence analysis method of aircraft on the assembly tooling in terms of two types of change: emergent change and initiated change,which can provide schemes for the decision of engineering change and technical support for the effective implementation of engineering change.The main content of the thesis is as follows:(1)The collaborative definition method of aircraft and assembly tooling,based on MBD technology,is studied.First the process of digital collaborative development of aircraft-assembly tooling is introduced.Then data model of assembly process of aircraft and its MBD model,data model of design/development process of assembly tooling and the corresponding MBD models are analyzed.Specifications of collaborative definition of aircraft-assembly tooling's MBD model are proposed.Finally,based on the MBD model,relational model of multiple structures for the aircraft-assembly tooling is presented and organization mode of aircraft-assembly tooling data is introduced.(2)In terms of the geometric structure changes of assembly tooling caused by geometric structure changes of aircraft(i.e.emergent change),collaborative change technology of aircraft-assembly tooling from the perspective of geometric structure is put forward.First,geometric and topological structure characteristics of aircraft-assembly tooling are introduced.Based on topology face,constraint model between aircraft and assembly tooling,and constraint model between assembly tooling parts are established.Then automatic acquisition algorithm of constraint relation based on MBD model and the expression of constraint relation in the form of matrix are introduced.Finally the method of change propagation analysis of assembly tooling,initiated from the geometric structure changes of aircraft,is studied.(3)In terms of the design changes of assembly tooling due to improvement and edition upgrade of aircraft(i.e.initiated change),collaborative change technology of aircraft-assembly tooling based on design workload is put forward.First based on the architecture model of product,the mapping relations among assembly requirement of aircraft,technical index and assembly tooling part are introduced.And the relation between assembly tooling parts on the basis of design parameter is proposed.Then propagation mechanism of design change of assembly tooling,initiated from the assembly requirement change,is studied.Next a mathematical model for workload propagation of design change is proposed.Finally,workload-based evaluation model of change schemes and the method for obtaining the optimal scheme of collaborative design change of aircraft-assembly tooling are presented.(4)The influence of assembly requirement change of aircraft on the development process of assembly tooling is studied,and parallel and collaborative change technology for assembly tooling development on the basis of duration and resource consumption is proposed.First development model of assembly tooling part is introduced.Then the parallel and collaborative change process of assembly tooling under task timing and resource constraints is studied.And the relation model and parallel degree model between the developments of assembly tooling part are established.Finally the method of acquiring change propagation schemes and selecting the optimal one is proposed.(5)A MBD-based collaborative change management system of aircraft-assembly tooling is developed.The framework and main functional modules of the prototype system are introduced,and an assembly tooling for the mid-upper fuselage assembly is applied to demonstrate the functions and operation process of the system.