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通过ANSYS/PDS模块对液压支架顶梁做可靠性分析，把结构尺寸、材料属性、外载荷均定义为随机变量，得出了顶梁的可靠度以及影响顶梁强度的关键因素是主肋板厚度，为液压支架后续的优化提供了科学的依据。“,”The probability analys for beam of hydraulic support is created with ANSYS/PDS. The geometric dimensions,material properties and load are taken as random variables with a normal distribution.The conclusion that the major influence factors of reliability of beam is main reinforcement thickness and reliability of beam is obtained.This provides academic evidence for the optimization of hydraulic support.