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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.
Aiming at the problems existed in the optimization design of a kind of bearing-rotor system with dynamic performance constraints, the following improvements are made: First, based on the current optimization model of a bearing-rotor system, the bearing clearance is taken as the design variable and the bearing clearance Secondly, a hybrid algorithm of evolutionary algorithm / linear search is proposed. The optimization process is divided into two stages. Firstly, the global optimum of the problem is solved by the evolutionary algorithm, and the optimal solution is obtained for a given algebra. As a new initial solution, the local search is performed by linear search method.The numerical simulation shows that adding the bearing clearance to the optimization model has a great influence on the optimization results. The hybrid algorithm overcomes the difficulty of using the linear search method In order to solve the problem of initial solution, this method has a higher success rate of solving in the same calculation accuracy and time-consuming.