鼠笼弹性支承结构优化设计方法

支承刚度是影响转子系统动力学特性的重要参数之一,为了提高鼠笼弹性支承刚度设计的精确性,提出了一种鼠笼结构优化设计方法.结合鼠笼的加工装配条件、柔度条件以及疲劳应力条件,建立带有非线性约束的鼠笼结构优化数学模型,基于该模型运用有效集算法优化鼠笼的结构参数,根据优化结果建立鼠笼参数化有限元模型,采用遗传算法对结构做进一步优化.最后举例验证了该方法的有效性.结果表明:在满足非线性约束的条件下,优化结果与设计目标值误差在1％以内,该优化方法提高了鼠笼刚度的设计精度,明显减少了设计迭代次数,从而缩短了设计周期.

Optimal Design Method of Squirrel Cage Elastic Support Structure

Bearing stiffness is one of the important parameters that affect the dynamic characteristics of rotor system. In order to improve the accuracy of squirrel cage elastic bearing stiffness design, an optimal design method of squirrel cage structure is proposed. Combined with the processing and assembling conditions, compliance conditions and fatigue stress conditions of the squirrel cage, a mathematical model of squirrel cage structure optimization with non-linear constraints is established. Based on this model, the effective set algorithm is used to optimize the structural parameters of the squirrel cage. According to the optimization results, a parameterized finite element model of the squirrel cage is established, and genetic algorithm is used to further optimize the structure. Finally, an example is given to verify the effectiveness of the method. The results show that under the condition of satisfying the non-linear constraint, the error between the optimization result and the design target value is less than 1%. The optimization method improves the design accuracy of squirrel cage stiffness, obviously reduces the number of design iterations, and thus shortens the design period.