【摘要】 针对大型复杂装备盾构机结构强度可靠性设计问题,选取其关键部件云腿结构作为研究对象。由于结构系统存在失效性,使可靠性受到影响。提出利用区间数学理论、区间退化理论和可靠性设计方法,将盾构机云腿参数的不确定参量的概率密度函数相关参数作为区间数。并考虑到云腿最易失效模式为强度失效,而强度表达式为高非线性,很难求解。利用一次二阶矩方法得出盾构机云腿强度的概率分布带区间的可靠性设计模型,提出了一种新的盾构机云腿可靠性设计思路。讨论了参数区间不确定水平对盾构机云腿可靠性的影响。结果表明,改进方法适合工程应用,对原始数据要求较低,为缺少试验数据的盾构机云腿结构可靠性分析提供了一种有效分析方法。更多还原

【Abstract】 Due to the structural strength reliability design of the large,complex shield machine,we studied the key ham of shield machine. As the failure of structure system makes an effect on the reliability,the parameters related to the probability density function of the uncertain parameters of the shield machine ham were chosen as the interval numbers,based on the interval mathematical theory,interval degradation theory and reliability design method.The most likely failure mode of the ham is strength failure,and its intensity expression is highly nonlinear,so it is difficult to solve it. By using a second moment method to make the reliability design model based on the random distributions with interval parameters for shield machine ham strength,a new reliability design idea of shield machine ham was proposed. And the influence of the parameters interval uncertain level to the reliability of the ham was discussed. The research shows that this approach is suitable for engineering application,and it does not need much original data,which provides an effective structural reliability analysis method for shield machine ham when lacking experimental data.更多还原