Study On The Robust And Flexible Design Decision Method Of Complex Product

With the development of society and technology, product function and performance need higher requirements. The traditional method of design is more difficult to meet the demand of complex product design. New design method to adapt to the characteristics of complex products is needed. Because the characteristics of complex product are multidisciplinary and coupling, its design must consider interaction between disciplines to achieve a whole system solution. For product design being a continuous improvement of process, the uncertainty of the design process should be considered. Due to the different disciplines’ different contents in their own areas, each discipline is more "willing to" make design decisions by itself.The coupling effect inevitably exists in the design process. For complex product design, the biggest uncertainty is the uncertainty of disciplines "communication". According to this problem, in order to reduce the coupling effect between disciplines and reduce design iteration, this paper introduced concept of robustness and flexibility into the problem of multidisciplinary with leader-follower game model in complex product design.Firstly, the first part focused on the background and significance of the issue, its domestic and international research status. Then, from the multidisciplinary interaction of complex products, the multidisciplinary interaction is analyzed in detail with leader-follower game model. Three kinds of coupling model——two-way coupling, one-way coupling and no coupling are presented about the complex coupling relationship between disciplines. Then, according to different sensitive degree of each variable, the design variables are assigned to different disciplines, which will eliminate the design of the conflict between disciplines.Secondly, this paper discusses the multidisciplinary uncertainty problem. The uncertainties of one discipline may be propagated to another discipline through the coupling variables and the final output from the integrated multidisciplinary system has an accumulation of the uncertainties from the individual disciplines which may influence the final design result. However, the method based on the response surface needs a great deal of calculation. For this issue, robustness is introduced. A robust design method is given, which uses type-I robust design method to reduce uncertainty among disciplines.Thirdly, the flexible thought is introduced in this paper. For multidisciplinary design process, the flexible technology is utilized to reduce the restriction of the leader of discipline to the follow of discipline. Combining the improved satisfaction index with information certainty, flexible measure is presented.Fourthly, this paper puts forward a kind of robust and flexible design decision method of complex product to three kinds of coupling relationship, which can reduce the coupling, the uncertainty and design iterations between the disciplines.At the end of this paper, this method is illustrated and validated via the application to the design of early oil tanker size design and the design of disk brake.