滑动摩擦副温度场模型研究及应用
发布时间：2018-12-12 16:31
【摘要】：摩擦热效应会引起接触界面温度升高,并在摩擦副中形成一个非均匀非稳定温度场,影响其摩擦学性能,导致机械零部件寿命的减少。由于摩擦热产生及传导受到诸多因素耦合影响,同时由于摩擦副相互接触且相对运动,使得测量和数值计算都很难获得较高精度的接触界面瞬态温度。因此如何获取滑动摩擦接触界面瞬态温度是摩擦学研究的重点和难点。本学位论文选题来自于国家自然科学基金项目“基于红外热像的摩擦副三维温度场重构方法”。本论文以专门研究材料摩擦学特性的摩擦磨损试验机上接触界面温度信息获取方法为研究对象,结合试验和数值计算,重点对脂润滑的端面滑动摩擦副接触界面瞬态温度的获取方法进行了深入研究。主要研究工作包括：1)设计了以温度测量信息为边界条件的摩擦接触界面温度场构建方案；通过数值计算研究了摩擦过程中摩擦副环形接触界面上的温度分布,验证了以平均值代替多点测温的可行性；研制了红外测温系统,通过隔热结构解决了热脉冲对红外探头的干扰问题。2)提出了以接触界面辐射亮温和滑动接触界面最外侧温度研究含脂非高温接触界面发射率的方法,对一种材料五种试验条件下的摩擦接触界面发射率的变化规律进行了试验研究,实现了相应的滑动接触界面辐射亮温初步修正。3)以初步修正后的辐射亮温为接触界面边界条件,以红外热像仪测量得到的下试样侧表面温度为修正条件,实现了较高精度的接触界面瞬态温度场重建；通过重建后下试样侧表面计算温度与热像仪测量值的对比,验证了滑动接触界面瞬态温度修正的有效性和正确性。4)讨论了端面滑动摩擦温度场的演变规律,证明了摩擦过程中下试样侧表面的温度分布均匀,可以使用红外探头代替热像仪测量其平均温度;通过不同材料试样、不同试验条件下的测量和计算结果,建立了滑动接触界面过程温度与载荷、转速和摩擦系数及下试样侧表面温度的线性回归方程,给出了端面滑动摩擦磨损试验机温度测量系统的构建方案。本文的研究成果在端面滑动摩擦接触界面瞬态温度的获取方法上进行了一些有价值的探索和研究,为获取材料摩擦学特性与温度的关系研究奠定了基础。
[Abstract]:The friction heat effect will cause the contact interface temperature to rise and a non-uniform and unstable temperature field will be formed in the friction pair which will affect its tribological properties and lead to the reduction of the life of the mechanical parts. The friction heat generation and conduction are affected by many coupling factors. At the same time, because of the contact and relative motion of the friction pairs, it is difficult to obtain the contact interface transient temperature with high accuracy by the measurement and numerical calculation. Therefore, how to obtain the transient temperature of sliding friction contact interface is an important and difficult point in tribology. The thesis is based on the National Natural Science Foundation of China, the method of 3D temperature field reconstruction of friction pairs based on infrared thermal image. In this paper, the method of obtaining contact interface temperature information of friction and wear tester, which is specially used to study the tribological properties of materials, is used as the research object. The method of obtaining the transient temperature of the contact interface of the grease lubricated sliding friction pair is studied in detail. The main research work is as follows: 1) the temperature field of friction contact interface with temperature measurement information as boundary condition is designed; The temperature distribution at the annular contact interface of the friction pair is studied by numerical calculation, and the feasibility of using the average value instead of the multi-point temperature measurement is verified. The infrared temperature measurement system is developed, and the interference problem of thermal pulse to infrared probe is solved by thermal insulation structure. 2) A method to study the emissivity of the adipose non-high temperature contact interface based on the radiative radiation of the contact interface and the most outer temperature of the sliding contact interface is proposed. The variation of the emissivity of friction contact interface under five experimental conditions of one material is studied experimentally. The corresponding radiative bright temperature of the sliding contact interface is corrected. 3) the radiation brightness temperature after the initial correction is taken as the boundary condition of the contact interface, and the surface temperature of the lower specimen measured by the infrared thermal imager is taken as the correction condition. The transient temperature field reconstruction of contact interface with high precision is realized. The validity and correctness of the transient temperature correction of the sliding contact interface are verified by comparing the calculated temperature of the lower surface of the specimen after reconstruction with the measured values of the thermal imager. 4) the evolution law of the sliding friction temperature field on the end face is discussed. It is proved that the temperature distribution of the side surface of the lower specimen is uniform in the process of friction, and the average temperature can be measured by using infrared probe instead of thermal imager. The linear regression equations of the temperature and load, rotational speed and friction coefficient of sliding contact interface and the surface temperature of the lower side of the specimen were established by measuring and calculating the results of different materials and different test conditions. The design of the temperature measuring system of the end face sliding friction and wear tester is presented. In this paper, some valuable researches have been done on the method of obtaining the transient temperature of the sliding friction contact interface of the end face, which lays a foundation for the study of the relationship between the tribological properties and the temperature of the materials.
【学位授予单位】：合肥工业大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TH117.1
本文编号：2374912
[Abstract]:The friction heat effect will cause the contact interface temperature to rise and a non-uniform and unstable temperature field will be formed in the friction pair which will affect its tribological properties and lead to the reduction of the life of the mechanical parts. The friction heat generation and conduction are affected by many coupling factors. At the same time, because of the contact and relative motion of the friction pairs, it is difficult to obtain the contact interface transient temperature with high accuracy by the measurement and numerical calculation. Therefore, how to obtain the transient temperature of sliding friction contact interface is an important and difficult point in tribology. The thesis is based on the National Natural Science Foundation of China, the method of 3D temperature field reconstruction of friction pairs based on infrared thermal image. In this paper, the method of obtaining contact interface temperature information of friction and wear tester, which is specially used to study the tribological properties of materials, is used as the research object. The method of obtaining the transient temperature of the contact interface of the grease lubricated sliding friction pair is studied in detail. The main research work is as follows: 1) the temperature field of friction contact interface with temperature measurement information as boundary condition is designed; The temperature distribution at the annular contact interface of the friction pair is studied by numerical calculation, and the feasibility of using the average value instead of the multi-point temperature measurement is verified. The infrared temperature measurement system is developed, and the interference problem of thermal pulse to infrared probe is solved by thermal insulation structure. 2) A method to study the emissivity of the adipose non-high temperature contact interface based on the radiative radiation of the contact interface and the most outer temperature of the sliding contact interface is proposed. The variation of the emissivity of friction contact interface under five experimental conditions of one material is studied experimentally. The corresponding radiative bright temperature of the sliding contact interface is corrected. 3) the radiation brightness temperature after the initial correction is taken as the boundary condition of the contact interface, and the surface temperature of the lower specimen measured by the infrared thermal imager is taken as the correction condition. The transient temperature field reconstruction of contact interface with high precision is realized. The validity and correctness of the transient temperature correction of the sliding contact interface are verified by comparing the calculated temperature of the lower surface of the specimen after reconstruction with the measured values of the thermal imager. 4) the evolution law of the sliding friction temperature field on the end face is discussed. It is proved that the temperature distribution of the side surface of the lower specimen is uniform in the process of friction, and the average temperature can be measured by using infrared probe instead of thermal imager. The linear regression equations of the temperature and load, rotational speed and friction coefficient of sliding contact interface and the surface temperature of the lower side of the specimen were established by measuring and calculating the results of different materials and different test conditions. The design of the temperature measuring system of the end face sliding friction and wear tester is presented. In this paper, some valuable researches have been done on the method of obtaining the transient temperature of the sliding friction contact interface of the end face, which lays a foundation for the study of the relationship between the tribological properties and the temperature of the materials.
【学位授予单位】：合肥工业大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TH117.1
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