【作者】 胡伟；

【导师】 张传伟；

【作者基本信息】 哈尔滨工业大学 ， 机械设计及理论， 2022， 硕士

【摘要】 活动部件接触表面摩擦热对其工作稳定性和可靠性有着重要影响,如何准确测量摩擦温升对机械活动部件的设计、维护及性能提升具有重大意义。随着涂层制备技术的发展,薄膜传感器已用于航空发动机热端部件非接触区温度场的测量,然而接触区复杂的工况限制了薄膜传感器的进一步发展,与此同时,对于接触区存在多层涂层结构的温度场分布缺乏理论上的推导计算。针对以上问题,本文开展摩擦接触区表面镀两层及三层涂层时摩擦热控制方程的推导工作,基于有限元分析的方法验证热敏涂层分布函数的求解结果,设计并制备薄膜热电阻温度传感器,基于球盘配副摩擦磨损试验,进行滑动接触区摩擦温度场的测量,为接触区摩擦温度场的分析与测试提供理论支持和试验指导。针对接触区存在多层涂层结构时摩擦热控制方程求解困难的问题,本文基于傅里叶变换以及级数展开的数学方法,推导摩擦副表面分别镀有两层和三层涂层时二维稳态无内热源的导热微分方程的解析解,利用有限元分析方法,建立移动热源模型,对镀有三层涂层时的摩擦表面进行热仿真分析,验证摩擦热控制方程的解析解,为后续滑动接触区摩擦温度的测量提供理论分析基础。基于薄膜热电阻温度传感器的测量原理,考虑到薄膜热电阻温度传感器热敏涂层和钢基底之间绝缘性的要求以及传感器的尺寸、接线位置对测量结果的影响,开展薄膜热电阻温度传感器的设计工作,基于电弧离子镀法对薄膜传感器进行制备,为后续滑动接触微区摩擦温度的测量提供试验基础。基于UMT摩擦磨损试验机,设计球盘摩擦磨损试验方案,开展滑动接触区摩擦温度的测量试验,基于推导的带三层涂层表面摩擦热控制方程的解析解,得到热敏涂层的温度分布,利用COMSOL仿真软件,计算出电压值随温度的变化关系,结合试验采集的电压信号得到滑动接触区摩擦温度的测量结果。与此同时,利用SEM扫描电镜拍摄的接触区磨痕示意图,分析测量结果的可靠性,为薄膜热电阻温度传感器应用于接触区温度的测量提供理论支持和试验指导。更多还原

【Abstract】 The frictional heat of the contact surface of the moving parts has an important influence on its working stability and reliability.How to accurately predict and measure the frictional temperature rise is of great significance to the design,maintenance and performance improvement of mechanical moving parts.With the development of coating technology,thin-film sensors have been used to measure the temperature field in the noncontact area of aero-engine hot-end components.However,the complex working conditions in the contact area limit the further development of thin-film sensors.At the same time,There is a lack of theoretical derivation and calculation for the temperature field distribution of the multi-layer coating structure in the contact area.In view of the above problems,this paper has carried out the derivation of the friction heat control equation when the surface of the friction contact area is coated with two layers and three layers of coatings.Based on the finite element analysis method,the solution results of the friction temperature rise equation are verified.A thin film thermal resistance temperature sensor was designed and fabricated.Based on the ball-disk friction and wear test,the measurement of the friction temperature field in the sliding contact area was carried out,which provided theoretical support and experimental guidance for the analysis and test of the friction temperature field in the contact area.Aiming at the difficulty in solving the control equation of friction heat when there is a multi-layer coating structure in the contact area,based on the mathematical method of Fourier transform and series expansion,the analytical solution of the two-dimensional steady-state thermal conduction differential equation without internal heat source is derived when the friction surface is coated with two and three layers,respectively.Using the finite element analysis method,a moving heat source model was established,and the thermal simulation analysis of the friction surface with three layers of coatings was carried out,and the analytical solution of the friction heat control equation was verified,it provides a theoretical analysis basis for the subsequent measurement of the friction temperature field in the sliding contact area.Based on the measurement principle of the thin film thermal resistance temperature sensor,considering the insulation requirements between the thermal coating and the steel substrate of the thin film thermal resistance temperature sensor,and the influence of the sensor size and wiring position on the measurement results,the thin film thermal resistance temperature sensor was developed.The thin film sensor was fabricated based on the magnetron sputtering method,which provided the experimental basis for the subsequent measurement of the frictional temperature field in the sliding contact area.Based on the UMT friction and wear testing machine,the ball-disk friction and wear test scheme was designed,and the measurement test of the friction temperature field in the sliding contact area was carried out.Based on the analytical solution of the deduced tribological heat control equation for the surface with three-layer coating,the temperature distribution of the heat-sensitive coating is obtained,Using the COMSOL simulation software,the relationship between the voltage value and the temperature was calculated,and the measurement results of the friction temperature field in the sliding contact area were obtained by combining the voltage signals collected by the test.At the same time,the reliability of the measurement results is analyzed by using the schematic diagram of the wear scar in the contact area photographed by SEM scanning electron microscope,which provides theoretical support and experimental guidance for the application of the thin film thermal resistance temperature sensor to the measurement of the temperature field in the contact area.更多还原