本文選題：電控摩擦 + 應(yīng)變電測法　； 參考：《太原科技大學(xué)》2015年碩士論文

【摘要】：為了研究不同水基潤滑液中陶瓷/不銹鋼摩擦副的摩擦行為對外加電場的響應(yīng)情況,現(xiàn)設(shè)計基于應(yīng)變電測法的微小電控摩擦測試系統(tǒng)。該系統(tǒng)主要結(jié)構(gòu)有:摩擦頭進(jìn)給系統(tǒng)、摩擦盤轉(zhuǎn)動系統(tǒng)、外部電壓施加裝置、應(yīng)變傳感機(jī)構(gòu)、測量與數(shù)據(jù)處理系統(tǒng)。進(jìn)給系統(tǒng)由三維手動五軸精密位移臺和單向精密滑臺組成。轉(zhuǎn)動系統(tǒng)由主軸,步進(jìn)電機(jī),步進(jìn)電機(jī)驅(qū)動器和PLC控制器組成。電壓的施加采用了石墨輔助電極。應(yīng)變傳感機(jī)構(gòu)采用了雙平行懸臂結(jié)構(gòu),該懸臂結(jié)構(gòu)可以很好的實現(xiàn)正壓力與摩擦力的解耦,并且就有良好的線性度、恢復(fù)性和回復(fù)性,這一點通過ANSYS數(shù)值模擬和標(biāo)定實驗得到驗證;采用該結(jié)構(gòu)在實驗中可以分別測量正壓力和摩擦力,進(jìn)而得到摩擦系數(shù)。測量方法則采用了應(yīng)變電測法,在每組平行懸臂上使用四個完全相同應(yīng)變片傳感器作為橋臂組成全橋應(yīng)變電路,將懸臂的應(yīng)變轉(zhuǎn)換為電壓信號輸出,經(jīng)由數(shù)據(jù)采集卡將模擬信號轉(zhuǎn)化為數(shù)字信號;用Lab VIEW軟件編寫程序來記錄和處理實驗數(shù)據(jù)。利用完成的電控摩擦測試系統(tǒng)進(jìn)行電控摩擦試驗,通過實驗發(fā)現(xiàn),陶瓷/不銹鋼摩擦副在不同潤滑液中不同外加電壓下電控摩擦行為有所不同:(1)當(dāng)陶瓷/不銹鋼摩擦副分別處于氯化鈉溶液、十二烷基硫酸鈉溶液和十二烷基二甲基芐基氯化銨溶液中時,其摩擦特性在外加電場的作用下會發(fā)生改變,摩擦系數(shù)會增大。其中后兩種溶液相對于前者溶液來說對外加電場的響應(yīng)更為顯著;(2)摩擦副的相對滑動速度會影響陶瓷/不銹鋼摩擦副在同一潤滑狀態(tài)下的電控摩擦特性,摩擦系數(shù)會隨著相對滑動速度的增加而減小;(3)對于氯化鈉溶液而言,其濃度對陶瓷/不銹鋼摩擦副的電控摩擦特性的影響并不明顯,但相同外加電壓條件下,電流會隨著濃度的增加而增大。
[Abstract]:In order to study the response of friction behavior of ceramic / stainless steel friction pairs to external electric field in different water based lubricating fluids, a micro electrically controlled friction testing system based on strain electric measurement method is designed. The main structure of the system includes: friction head feed system, friction disk rotation system, external voltage application device, strain sensing mechanism, measurement and data processing system. The feed system consists of three-dimensional manual five-axis precision displacement table and one-way precision slide table. The rotation system consists of spindle, step motor, step motor driver and PLC controller. The voltage is applied with graphite auxiliary electrode. The strain sensing mechanism adopts a double parallel cantilever structure, which can decouple the positive pressure and friction force, and has good linearity, recovery and recovery. This is verified by ANSYS numerical simulation and calibration experiments, and the friction coefficient can be obtained by measuring the positive pressure and friction force in the experiment. In each group of parallel cantilever, four identical strain gauge sensors are used as the bridge arm to form the full bridge strain circuit. The strain of the cantilever is converted into voltage signal output. The analog signal is converted into digital signal by data acquisition card, and the program is written by Lab VIEW software to record and process the experimental data. The electronic friction test is carried out by using the electronic control friction test system, and it is found that, When the ceramic / stainless steel friction pair is in sodium chloride solution, the friction behavior of ceramic / stainless steel friction pair is different under different applied voltage. When sodium dodecyl sulfate solution and dodecyl dimethyl benzyl ammonium chloride solution, the friction characteristics will change under the action of external electric field, and the friction coefficient will increase. The response of the latter two solutions to the applied electric field is more significant than that of the former. The relative sliding velocity of the friction pairs will affect the friction characteristics of ceramic / stainless steel friction pairs under the same lubrication condition. The friction coefficient will decrease with the increase of relative sliding speed. For sodium chloride solution, the effect of its concentration on the electronic friction characteristics of ceramic / stainless steel friction pair is not obvious, but under the same applied voltage, The current increases with the concentration.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TH117.1

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