【摘要】：摩擦熱效應(yīng)會(huì)引起接觸界面溫度升高,并在摩擦副中形成一個(gè)非均勻非穩(wěn)定溫度場(chǎng),影響其摩擦學(xué)性能,導(dǎo)致機(jī)械零部件壽命的減少。由于摩擦熱產(chǎn)生及傳導(dǎo)受到諸多因素耦合影響,同時(shí)由于摩擦副相互接觸且相對(duì)運(yùn)動(dòng),使得測(cè)量和數(shù)值計(jì)算都很難獲得較高精度的接觸界面瞬態(tài)溫度。因此如何獲取滑動(dòng)摩擦接觸界面瞬態(tài)溫度是摩擦學(xué)研究的重點(diǎn)和難點(diǎn)。本學(xué)位論文選題來(lái)自于國(guó)家自然科學(xué)基金項(xiàng)目“基于紅外熱像的摩擦副三維溫度場(chǎng)重構(gòu)方法”。本論文以專門研究材料摩擦學(xué)特性的摩擦磨損試驗(yàn)機(jī)上接觸界面溫度信息獲取方法為研究對(duì)象,結(jié)合試驗(yàn)和數(shù)值計(jì)算,重點(diǎn)對(duì)脂潤(rùn)滑的端面滑動(dòng)摩擦副接觸界面瞬態(tài)溫度的獲取方法進(jìn)行了深入研究。主要研究工作包括：1)設(shè)計(jì)了以溫度測(cè)量信息為邊界條件的摩擦接觸界面溫度場(chǎng)構(gòu)建方案；通過(guò)數(shù)值計(jì)算研究了摩擦過(guò)程中摩擦副環(huán)形接觸界面上的溫度分布,驗(yàn)證了以平均值代替多點(diǎn)測(cè)溫的可行性；研制了紅外測(cè)溫系統(tǒng),通過(guò)隔熱結(jié)構(gòu)解決了熱脈沖對(duì)紅外探頭的干擾問(wèn)題。2)提出了以接觸界面輻射亮溫和滑動(dòng)接觸界面最外側(cè)溫度研究含脂非高溫接觸界面發(fā)射率的方法,對(duì)一種材料五種試驗(yàn)條件下的摩擦接觸界面發(fā)射率的變化規(guī)律進(jìn)行了試驗(yàn)研究,實(shí)現(xiàn)了相應(yīng)的滑動(dòng)接觸界面輻射亮溫初步修正。3)以初步修正后的輻射亮溫為接觸界面邊界條件,以紅外熱像儀測(cè)量得到的下試樣側(cè)表面溫度為修正條件,實(shí)現(xiàn)了較高精度的接觸界面瞬態(tài)溫度場(chǎng)重建；通過(guò)重建后下試樣側(cè)表面計(jì)算溫度與熱像儀測(cè)量值的對(duì)比,驗(yàn)證了滑動(dòng)接觸界面瞬態(tài)溫度修正的有效性和正確性。4)討論了端面滑動(dòng)摩擦溫度場(chǎng)的演變規(guī)律,證明了摩擦過(guò)程中下試樣側(cè)表面的溫度分布均勻,可以使用紅外探頭代替熱像儀測(cè)量其平均溫度;通過(guò)不同材料試樣、不同試驗(yàn)條件下的測(cè)量和計(jì)算結(jié)果,建立了滑動(dòng)接觸界面過(guò)程溫度與載荷、轉(zhuǎn)速和摩擦系數(shù)及下試樣側(cè)表面溫度的線性回歸方程,給出了端面滑動(dòng)摩擦磨損試驗(yàn)機(jī)溫度測(cè)量系統(tǒng)的構(gòu)建方案。本文的研究成果在端面滑動(dòng)摩擦接觸界面瞬態(tài)溫度的獲取方法上進(jìn)行了一些有價(jià)值的探索和研究,為獲取材料摩擦學(xué)特性與溫度的關(guān)系研究奠定了基礎(chǔ)。
[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.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：TH117.1

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本文編號(hào)：2374912