Study On The Rear Suspension Subsystem Optimization Design Of A Vehicle Chassis Architecture

Research of this thesis is based on the pre-concept development of a rear subframewhich belongs to a new models multi-link rear suspension subsystem. The modular designof the architecture is studied besed on the concept of architecture development combinedwith the current vehicle early development technology. Finally, a new program of chassisarchitecture rear suspension subsystem optimization design is proposed, at the same timethe optimization design of the rear subframe is realized.Causes and significance of the product architecture development generated isanalyzed and the relationship of rear suspension subsystem in the chassis architecture isexpressed by mathematical formulas. The optimization design program which includeexperiment design module, approximate model module, optimization module is completedbased on experimental design technology, approximate model construction method and themulti-objective optimization algorithm integrated design.The ability of SFE is proved by the analysis comparison of SFE model and traditionalFE model of subframe. The experimental design techniques in early development is studiedby using batch processing technology and iSIGHT software integrated with SFECONCEPT function. The efficiency and quality of product development are greatlyimproved compared with the traditional CAE Technology.The approximate model of rear subframe is established. Methods for constructingaccuracy and reliable approximate model be studied through the study of theapproximation accuracy evaluation, contribution analysis and correlation. Comparative ofdifferent multi-objective optimization algorithms is analyzed. After that work, the study ofthe mothed to establish multi-objective optimization module is finished.The rear subframe optimization design is researched through a Kriging modelestablished based on the experimental data. The simulated annealing algorithm result beselected for the optimal solution results based on the comparison of different optimization results. Finally, the rear subframe performance index of each study are improved, at thesame time, the light quantitative design is realized as the loss rate reaches7.8%. Theresults proves that the optimization design program which proposed in this thesis isfeasible and practical.The optimization design program which proposed in this thesis has a greater referencevalue for engineering design theory.