【作者】 陈静；

【导师】 范迅；

【作者基本信息】 中国矿业大学（北京） ， 机械设计及理论， 2014， 博士

【摘要】 将基于可靠性基本理论的疲劳寿命模型与优化设计方法相结合，以液压支架基本的三腔室箱型结构为例，建立箱型结构空间力学分析模型。在对箱形截面弯曲正应力、弯曲剪应力、扭转剪应力及等效应力的分析基础上，提出了基于疲劳寿命的液压支架常见箱型结构的可靠性优化数学模型，为采用有限元分析的方法对液压支架关键部件进行可靠性优化设计提供了理论依据。论文采用有限元分析方法首先对ZY6400/21/45液压支架进行强度分析，找出支架存在的强度隐患，通过系统地对掩护梁、顶梁的强度优化，消除了支架的强度薄弱环节。然后利用有限元分析方法对ZY6400/21/45型液压支架进行基于最大应力约束和疲劳寿命约束的可靠性优化，在满足液压支架强度可靠性的基础上减轻了支架的重量。论文提出的液压支架基于强度可靠性的优化设计方法，为支架的优化设计提供了新的思路。更多还原

【Abstract】 The fatigue life model based on basic reliability theory was combined with the optimizationdesign method, and the basic three-chamber box structure of the powered support was taken as anexample, the spatial analysis model of box structure was established. Through the analysis ofbending normal stress, bending shear stress, torsion shear stress and the equivalent stress ofbox-section, the mathematical reliability optimization model of common box structure of thepowered supports was summarized up based on the fatigue life, which provides a theoretical basisfor the powered supports to do reliability optimization design using finite element analysis method.In the paper, first finite element analysis method was applied to analyze the strength ofZY6400/21/45powered support, the hidden trouble in the intensity of the powered support wasfound. Through systematically strength optimization of the key components, such as debris shield,and roof beam.etc, the weak link of powered supports was eliminated. Then finite element analysismethod was used to do reliability optimization of the ZY6400/21/45powered support based onbiggest stress and fatigue life constraint, the weight of the powered support was reduced on thebasis of meeting the strength reliability of the powered support. Proposed in this paper, theoptimization method based on the strength reliability of powered supports provide a new idea forthe optimization design of powered supports.更多还原