论文部分内容阅读
以交通工具中部分锥形薄壁方管的安全装置作为研究对象,建立以薄壁管在碰撞过程中吸收能量最大化,比吸能最大化和初始碰撞力峰值最小化为多目标的优化问题,用锥形部分的几何参数作为设计变量,在保证不降低薄壁管吸能能力的情况下,通过对其结构的优化达到初始碰撞力峰值最小化的目的,论文采用有限元软件LS-DYNA得到不同几何参数模型的碰撞信息,用响应面法构造近似函数,同时引入权系数以表征各个目标在优化问题中的重要程度,并采用理想点法求解多目标优化问题,分析了锥形薄壁方管各几何参数对结构的能量吸收、比吸能和初始碰撞力峰值的影响,最终得到了给定权系数下的最优模型。
Taking the safety device of partially tapered thin-walled square tube in the vehicle as the research object, an optimization problem is established to maximize the absorbed energy, the specific energy absorption maximum and the initial peak impact force of the thin-walled tube as a multi-objective during the collision process. The geometric parameters of the tapered part are used as design variables. The finite element software LS-DYNA is used to obtain the peak value of the initial impact force through the optimization of its structure without reducing the energy absorption capacity of the thin-walled tube. Geometry parameter model collision information, the response surface method is used to construct the approximate function, at the same time, the weight coefficient is introduced to characterize the importance of each target in the optimization problem, and the ideal point method is used to solve the multi-objective optimization problem. The influence of parameters on energy absorption, specific energy absorption and initial collision force peak of the structure finally obtained the optimal model under the given weight coefficient.