考虑轴承游隙的非线性动力学轴承-转子系统优化

针对一类带动态性能约束的轴承-转子系统优化设计存在的问题,做如下改进工作:一是在目前一类轴承-转子系统优化模型基础上,将轴承游隙作为设计变量,考虑轴承游隙的影响;二是提出了一种演化算法/线性搜索的混合算法,将优化过程分为两个阶段,首先采用演化算法对问题全局寻优,求得给定代数时的优化解,再以此解作为新的初始解,采用线性搜索方法进行局部搜索.经数值仿真表明:该优化模型中增加考虑轴承游隙后,对优化结果有较大影响;提出的混合算法克服了使用线性搜索方法难以确定初始解的问题,在同等计算精度和耗时情况下,该方法求解成功率较高. 

Optimization of rotor-bearing system with nonlinear dynamics considering internal clearance

In view of existing problems in optimization of a rotor-bearing system with dynamic performance constraints, the following improvements were made. Firstly, influence of clearance was considered in the optimization model. Secondly, a hybrid algorithm based on evolutionary algorithm/line search method was proposed. In the proposed algorithm, there were two optimization processes, global searching process using evolutionary algorithm to obtain an optimal solution and local searching starting with the optimal solution by line search method. Numerical results show that: the clearance has great influence on optimization results. The proposed algorithm overcomes the difficulty in choosing initial value for line search method, with higher success rate under the same calculation accuracy.