盘式制动器是采煤机运行的重要部件，对其进行可靠性分析有助于提高采煤机运行的可靠性、有效减少安全隐患。本文以采煤机制动器为研究对象，对其进行结构可靠性分析，热-机耦合可靠性分析和系统故障树分析。论文主要研究工作如下：
（1）采煤机盘式制动器的结构可靠性分析：建立采煤机液压盘式制动器的结构有限元模型，并基于所构建的有限元模型对其进行结构分析，从而求解给定参数下采煤机液压盘式制动器制动盘的最大应力。采用随机参数对采煤机盘式制动器系统的不确定性进行描述，运用 ANSYSworkbench 的六西格玛模块对盘式制动器制动盘进行可靠性分析。
（2）采煤机盘式制动器的热-机耦合可靠性分析：建立采煤机盘式制动器的热-机耦合有限元模型，求解给定参数下采煤机盘式制动器的最大温度值。为对采煤机盘式制动器进行热可靠性分析，通过多项式响应面法构建了采煤机盘式制动器的热-机耦合功能函数的代理模型。通过对构建的响应面模型进行分析得出：制动载荷和摩擦系数是对采煤机盘式制动器中制动盘温度影响最大的两个因素。最后采用正态分布描述结构中的不确定参数，从而对盘式制动器进行热机耦合可靠性分析。
（3）采煤机盘式制动器的故障树分析：对采煤机盘式制动器主要部件的故障模式及其对系统功能的严酷度进行分析，对整个制动器进行故障影响及原因分析。基于故障树函数结构理论建立盘式制动器的故障树模型，分别运用最小割集法对故障树模型进行了定性和定量分析，给出盘式制动器的系统失效概率及底事件的概率重要度。

  To improve operational reliability and effectively reduce potential safety hazards, the reliability analysis of disc brake, which is an important part of coal mining machine, is conducted. This paper investigates the structural reliability analysis, thermo-mechanical coupling reliability analysis, and system fault tree analysis of the disc brake. The main contents are as follows:
  (1) Structural reliability analysis of disc brake: The finite element model of the disc brake of the coal mining machine is established, and whereby structural analysis is conducted to solve the maximum stress of the brake disc under given parameters. By representing uncertain parameters as random parameters, the reliability analysis of the brake disc is performed by using the six sigma module inANSYS workbench.
  (2) Thermal-mechanical coupling reliability analysis of disc brake: the thermal-mechanical coupling finite element model of the disc brake is established to solve the maximum temperature under given parameters. The surrogate model of thermal-mechanical coupling function of the disc brake is constructed by polynomial response surface method. Through the analysis of the constructed response surface model, it is concluded that the braking load and friction coefficient are the two factors that have the greatest influence on the temperature of the brake disc. Finally, the thermal-mechanical coupling reliability of the disc brake is conducted by dealing uncertain parameters with normal distribution.
  (3) Fault tree analysis of disc brake : The fault mode of main components of the disc brake and the severity of system function are analyzed, and the fault influence and cause analysis of the whole brake are carried out. Based on the theory of fault tree function structure, the fault tree model of the disc brake is established. The fault tree model is quantitatively and qualitatively analyzed by using the minimum cut set method, and then the system failure probability of the disc brake and the probability importance of bottom event are given.