An automotive body is composed of compliant sheet metal parts.Fast and exactly diagnosing variation sources is very important when assembly variations happen.This paper proposes a diagnosis method of multi fixture var...An automotive body is composed of compliant sheet metal parts.Fast and exactly diagnosing variation sources is very important when assembly variations happen.This paper proposes a diagnosis method of multi fixture variations based on the variation model of compliant sheet metal assembly.The assembly variation model is obtained by using the method of influence coefficients(MIC) and considering the manufacturing variations of compliant parts and multi fixture variations.The measurement point variations induced by part manufacturing variations are firstly removed from the measurement data.The variation patterns of multi fixture variations are constructed by column vectors of fixture variation sensitivity matrix.This method is proved to be feasible for exactly diagnosing the fixture variations and has higher diagnosis efficiency than designated component analysis(DCA).展开更多
The high-speed train body is welded with aluminum alloy assemblies or parts.Due to the material properties,the welding deformation is much significant.In order to control the welding deformation,this paper takes the s...The high-speed train body is welded with aluminum alloy assemblies or parts.Due to the material properties,the welding deformation is much significant.In order to control the welding deformation,this paper takes the sidewall welding of a high-speed train body as the research objective,and carries out the fixture locating modelling and optimization research of the aluminum alloy sidewall.Firstly,a finite element model of the sidewall is established and verified by the comparison between the analysis results and the actual measurement data.Then the residual stress and deformation of the sidewall after welding are analyzed.By selecting the longitudinal parameters of different fixture locating layouts for welding analysis,models describing the relat ionship between the maximum welding residual stress and maximum welding deformation and the longitudinal fixture locating distance of the sidewall are established.Finally,the fixture locating model of welding deformation is used to optimize the longit udinal fixture locating distance.And the transverse fixture locating distance is also optimized by comparing different locating positions.The result shows that the welding residual stress and the welding deformation have been decreased in the optimal fixture locat ing layout.展开更多
基金the National Natural Science Foundation of China (No. 50705056)the National High Technology Research and Development Program (863) of China (No.2006AA04Z148)
文摘An automotive body is composed of compliant sheet metal parts.Fast and exactly diagnosing variation sources is very important when assembly variations happen.This paper proposes a diagnosis method of multi fixture variations based on the variation model of compliant sheet metal assembly.The assembly variation model is obtained by using the method of influence coefficients(MIC) and considering the manufacturing variations of compliant parts and multi fixture variations.The measurement point variations induced by part manufacturing variations are firstly removed from the measurement data.The variation patterns of multi fixture variations are constructed by column vectors of fixture variation sensitivity matrix.This method is proved to be feasible for exactly diagnosing the fixture variations and has higher diagnosis efficiency than designated component analysis(DCA).
基金the National Natural Science Founda-tion of China(No.51375277)the Natural Science Foundation of Shandong Province(No.ZR2016EEM31)。
文摘The high-speed train body is welded with aluminum alloy assemblies or parts.Due to the material properties,the welding deformation is much significant.In order to control the welding deformation,this paper takes the sidewall welding of a high-speed train body as the research objective,and carries out the fixture locating modelling and optimization research of the aluminum alloy sidewall.Firstly,a finite element model of the sidewall is established and verified by the comparison between the analysis results and the actual measurement data.Then the residual stress and deformation of the sidewall after welding are analyzed.By selecting the longitudinal parameters of different fixture locating layouts for welding analysis,models describing the relat ionship between the maximum welding residual stress and maximum welding deformation and the longitudinal fixture locating distance of the sidewall are established.Finally,the fixture locating model of welding deformation is used to optimize the longit udinal fixture locating distance.And the transverse fixture locating distance is also optimized by comparing different locating positions.The result shows that the welding residual stress and the welding deformation have been decreased in the optimal fixture locat ing layout.
