基于区间模型的Y形密封圈可靠性分析

Reliability Analysis of the Y-ring Based on the Interval Model

该文利用基于区间模型的非概率可靠性分析方法,以某一规格的轴用Y圈为研究对象,对其非概率可靠性指标进行了研究;该文首先介绍了基于区间模型的非概率可靠性分析方法,然后对该规格Y形圈的非概率可靠性指标进行了研究,主要包括功能函数的拟合、基于区间模型的功能函数标准化及最后非概率可靠性指标的求解等内容;最后介绍影响非概率可靠性指标的主要因素。结果表明:当各不确定性参数在所述范围之内变化时,该规格的Y形圈在所述工况条件下的非概率可靠性指标η>1,说明当各不确定性参数在所述范围之内变化时,该规格的Y形圈在所述工况条件下,密封界面的接触压力始终大于油压,密封可靠,原则上不会失效;此外,一般情况下,影响非概率可靠性指标的主要因素有各随机因素分布区间的准确性、拟合所得的响应面函数的准确性以及优化方法(优化函数)的选择等。

In this paper,the non-probabilistic reliability index of a specification Y-ring was studied,using the non-probabilistic reliability analysis methodwhich is based on the interval model.Firstly,we introduced the non-probabilistic reliability analysis method which is based on the interval model.Secondly,we studied the non-probabilistic reliability index of the Y-ring,including the fit of the performance function,and the standardization of the performance function,and also the solving of the non-probabilistic reliability index.Last,the main factors influencing the non-probabilistic reliability index were introduced.The result showed that:the non-probabilistic reliability index of the Y-ring[η>1]it shows that:when each of the uncertain parameters vary within the range which is described in table1,the contact pressure of the Y-ring is always greater than the oil pressure in sealing interface under the working conditions,so the Y-ring is reliable,and it will not failure in principle;Besides,generally,the main factors influencing the non-probabilistic reliability index are as follows:first,the interval distribution accuracy of every random factor,second,the accuracy of the response surface function,third,the choice of the optimization method.