Flexural Resistance Optimization Of The Thin-walled Component And Its Application On Anti-collision Beam

Vehicle passive safety is one of the key problems for the automobile industry. Howto improve the crashworthiness of vehicles has been the key issue of the automotivesafety. The thin-walled components which are the conventional and effectiveenergy-absorbed device have been widely used in the automotive design andmanufacture. Therefore, the bending energy-absorbed characteristic research onthin-walled components has an important guidance on the design of the automotivecrash safety. And there are notable engineering significance and academic value. Basedon the existing research achievements and by use of the explicit finite element technique,design of experiments and approximate modeling methods, optimization method basedon6robustness analysis has been constructed in this thesis. The characteristicparameters of cross section of thin-walled components also have been optimized.Based on the existing research achievements, the basic theories of finite elementsimulation and optimization methods, which are involved in the bending resistanceoptimization of thin-walled components and static strength analysis on the car door,are briefly summarized in this thesis. On this basis, the finite element models ofthin-walled components in three different sections are built and simulated by use ofpre-processing software Hypermesh, explicit finite element software LS-DYNA andintegrated optimization platform Isight. According to the analysis results, Krigingapproximate models of response are built. In terms of ensuring accuracy of approximatemodels, deterministic and robustness optimizations of flexural performance are carriedout. In order to verify the accuracy and reliability of optimization results, the optimalsection is applied to the anti-collision beam of car door. According to the regulationFMVSS214, whole car modeling steps are described in detail and simulation of cardoor’s static strength has been done. The analysis results are discussed in simulationaccuracy, collision deformation and force which indicates that the optimized car doorstrength is better than the original one’s. Thus the optimal scheme achieves the desiredresults.The results of this thesis indicate that the optimization method and the processbased on robustness analysis are quite effective in the optimal anti-collisiondesign of thin-walled components. Besides, by applying the optimized section to theanti-collision of car door, the optimization method is proved to be effec tive, which has asignificant use in the reference to the automotive crash safety design optimization.