共振失效下复杂转子系统的可靠性稳健优化设计

Reliability Robust Optimization Design for Complex Rotor System Under Resonance Failure

针对大型复杂转子系统,根据其失效的判定准则,提出了基于共振失效的可靠性模型并对转子系统进行了可靠性稳健优化设计.首先,基于转子动力学理论判定了系统的主要失效模式,识别出最薄弱环节,预测了系统实际隔离裕度与许用隔离裕度,根据实际隔离裕度大于许用隔离裕度的关系准则,建立基于共振失效模式的可靠性模型;然后,基于神经网络技术、可靠性设计理论以及改进后的可靠性灵敏度计算方法,得到系统可靠度和基本随机变量对可靠度的影响程度,并对其进行排序,找到对系统影响较大参数后,在保证一定可靠度前提的基础上,对系统进行了可靠性稳健优化设计,使参数对可靠度的敏感程度降低.

According to the determinate criterion for the failure of a large complex rotor system, a reliability model based on the resonance failure was proposed and the reliability robust optimization design parameters for the rotor system could be accurately obtained. Firstly, based on the rotor dynamic theory the weakest link was identified, and the real isolative margin and allowable isolative margin were assessed. The resonance reliability model for rotor system judged by the criterion that the real isolative margin could be more than the allowable one. Then using the neural network technology, reliability design theory and modified reliability sensitivity design theory, the influence degree of original random parameters on reliability was computed out and found out which parameter has a high influence degree. Finally, reliability robust optimization design theory for system was studied to reduce sensitivity of random parameters to reliability on the basis of ensuring a certain reliability.