论文部分内容阅读
该文提出一种基于代理模型的复杂结构优化设计方法,并用于通风盘式制动器制动盘结构优化设计。提出的优化设计方法集成了CAE分析、实验设计、代理模型构造及非线性优化几部分,实验设计采用拉丁超立方抽样策略,代理模型选用改进的响应面模型,非线性优化算法采用序列二次规划算法。为了解决传统的响应面模型部分预测值与实验值误差较大问题,改进方法认为只有能够确保在每一个抽样点处的预测值与试验值的相对误差均在一定范围内的响应面模型才是一个可行的模型。在保证制动盘质量不变情况下,以寿命最大化为目标,应用设计的集成优化方法对制动盘进行优化设计,优化设计结果较好,其中制动盘疲劳寿命根据Coffin-Manson方法预测,制动过程中制动盘表面最大热应力及最高温度通过热机耦合的有限元模拟紧急制动过程获得。优化结果表明该文提出的方法是一种有效的复杂结构的优化设计方法。
In this paper, an optimization design method of complex structure based on agent model is proposed and used to optimize the structural design of the brake disc of ventilated disc brake. The proposed optimization design method integrates CAE analysis, experimental design, agent model construction and nonlinear optimization. The experimental design adopts Latin hypercube sampling strategy, the agent model adopts an improved response surface model, the nonlinear optimization algorithm uses the sequence quadratic programming algorithm. In order to solve the problem that the traditional response surface model has a large error between the predicted value and the experimental value, the improved method considers that only the response surface model that can ensure that the relative error between the predicted value and the experimental value at each sampling point is within a certain range A viable model. Under the condition of ensuring the same quality of the brake disc, the optimal design of the brake disc is applied to optimize the design of the brake disc, and the fatigue life of the brake disc is predicted according to the Coffin-Manson method , The maximum thermal stress and maximum temperature on the surface of the brake disc during braking are obtained through the finite element simulation of the emergency braking process by the heat engine coupling. The optimization results show that the proposed method is an effective method for the optimization design of complex structures.