Reliability analysis of a dynamic structural system is applied to predict chatter of side milling system for machining blisk. Chatter reliability is defined as the probability of stability for processing. A reliability model of chatter was developed to forecast chatter vibration of side milling, where structure parameters and spindle speed are regarded as random variables and chatter frequency is considered as intermediate variable. The first-order second-moment method was used to work out the side milling system reliability model. Reliability lobe diagram (RLD) was applied to distinguish reliable regions of chatter instead of stability lobe diagram (SLD). One example is used to validate the effectiveness of the proposed method and compare with the Monte Carlo method. The results of the two approaches were consistent. Chatter reliability and RLD could be used to determine the probability of stability of side milling.

运用动态结构系统的可靠性分析来预测侧铣系统叶轮的颤动。颤振可靠性定义为处理稳定性的概率。建立了颤振的可靠性模型来预测侧铣的颤振，其中结构参数和主轴转速被视为随机变量，颤振频率被视为中间变量。采用一阶二阶矩法建立了侧铣系统的可靠性模型。应用可靠性波瓣图（RLD）来区分震颤的可靠区域，而不是使用稳定波瓣图（SLD）。通过一个例子验证了所提方法的有效性，并与蒙特卡洛方法进行了比较。两种方法的结果是一致的。