压缩机转子系统的振动可靠性灵敏度设计

Vibration Reliability Sensitivity Design on Compressor Rotor System

为了对压缩机类复杂的转子系统进行可靠性灵敏度设计,探讨可靠度与基本随机变量之间的关系,得到不同随机变量对可靠性的影响程度。通过引入隔离裕度和放大因子的概念,在转子系统动力响应的基础上,预测系统实际隔离裕度与许用隔离裕度。首先,根据许用隔离裕度不超过实际的隔离裕度的关系准则,针对压缩机类转子系统提出了一种基于共振失效的振动可靠性模型;然后,利用神经网络模型代替了有限元模型建立了复杂结构的可靠度与基本随机变量的强非线性关系;最后,以某齿轮转子系统为例,应用可靠性设计理论求解某转子系统危险位置的可靠度,应用可靠性灵敏度理论得到了系统均值灵敏度和方差灵敏度。

The relationship between reliability and original random variables is discussed for the design of the reliability sensitivity of a complex compressor rotor system.First,by introducing the basic concepts of isolative intervals and amplification factors,the actual and permitted isolative intervals can be calculated by the dynamic response of the rotor system.Then,the vibration reliability model for the compressor system is established according to the rule that permitted isolative intervals cannot exceed the actual ones.Second,the strong non-linear relationship between the reliability of a complex structural model and original random parameters is obtained by an artificial neural network instead of the finite element(FE)model.Finally,a geared rotor system is taken as an example.The reliability at a dangerous position is calculated based on the reliability design theory,and the reliability sensitivity of the mean value and variance of parameters are also obtained.The results show that the system′s reliability is mainly affected by the working,manufacturing,installation and meshing parameters.In practical designs,the working parameters are dominant,followed by the manufacturing,installation and meshing parameters.