离合器摩擦副摩滑过程轴向振动特性研究

Axial vibration characteristics of friction disks of clutch on sliding

通过对摩擦副表面结构特征和接触力学等理论的应用,建立了热变形微观法向单元接触数学模型。采用数理统计和归一化方法,将微观模型转换成宏观数学模型,分析了摩擦副法向弹性接触特性,并引入Kelvin-Voigt(KV)模型,增加黏弹性接触微分算子,构建了包含有应力和应变关系的黏弹性接触属性的数学模型,得到了摩擦副轴向振动数学模型。经仿真分析,获得了摩擦副摩滑过程的振动特性,同时对不同转速条件下的摩擦副摩滑过程轴向振动特性进行了实验测试。经对比分析,结果表明,仿真模型精度达到87%,仿真结果准确。这为进一步深入研究振动特性对摩擦副使用性能和寿命,具有理论研究和工程设计指导意义。

By analyzing friction disk surface structural characteristics and using theory of contact mechanics, a micro-normal unit contact mathematic model of thermal distortion friction pairs was built. Using mathematic statistics and normalization, the micro-model could be transferred to macro-mathematic model, and then the normal elastic contact characteristics of friction pairs could be obtained. When the Kelvin-Voigt (KV) model was inputted into elastic contact characteristics, viscoelastic contact differential operator was included in the equation, and viscoelastic contact mathematic model that included the relation of stress to strain was built. So colligating above all the simulation results, an axial vibration mathematic model was built, and the vibration characteristics was obtained by simulation. For verifying simulation results, axial vibration experiment of friction pairs of clutch was tested on conditions of various rotational speeds. The contrasted results show that model precision is 87%, and the simulation results are correct. This is significant in theory and engineering design, and promotes studying deeply on vibration characteristics to advance friction pairs serviceability and life. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.