本文選題：摩擦力矩 + 故障診斷��； 參考：《河南科技大學(xué)》2011年碩士論文

【摘要】：航天軸承是對摩擦力矩要求最高的一類軸承。其中陀螺儀框架靈敏軸承的啟動(dòng)摩擦力矩和動(dòng)態(tài)摩擦力矩的大小以及穩(wěn)定性對陀螺儀表的指示精度和穩(wěn)定性都起著重要的作用,進(jìn)而對控制系統(tǒng)性能和航天器安全也起著重要的作用。對于微型航天靈敏軸承來講,內(nèi)外圈溝道圓度、粗糙度、磨削絲流、徑向游隙以及溝道形狀等方面的加工缺陷和表面劃傷都會影響軸承的啟動(dòng)和運(yùn)轉(zhuǎn)力矩,使軸承摩擦力矩出現(xiàn)“大點(diǎn)”,“死點(diǎn)”以及波動(dòng)性,甚至造成卡球。所以,通過研究分析,采用多種有效的方法對由這些因素造成的航天軸承故障的診斷是十分必要的,對于提高航天軸承的質(zhì)量,保障航天器的壽命和可靠性,減少經(jīng)濟(jì)損失具有重大的現(xiàn)實(shí)意義。 鑒于摩擦力矩對陀螺儀框架靈敏軸承工作狀況的重要作用,本文采用LSD-I型動(dòng)態(tài)摩擦力矩測試儀采集了兩種型號該類軸承的動(dòng)態(tài)摩擦力矩波形圖,對內(nèi)外圈溝道形狀不好、內(nèi)圈圓度不好、內(nèi)圈粗糙度不好、內(nèi)外圈磨削絲流等單一缺陷各相應(yīng)的摩擦力矩波形進(jìn)行了分析研究。運(yùn)用傅里葉變換、小波分析和統(tǒng)計(jì)學(xué)等數(shù)學(xué)工具進(jìn)行時(shí)域頻域分析,概率密度函數(shù)分析,功率譜分析,包絡(luò)譜分析以及其它參數(shù)的計(jì)算,力圖找到針對各種缺陷的波形特征,從而得出用航天軸承摩擦力矩特征診斷其工藝缺陷的初步判據(jù),并形成了有效的診斷方法。最后用LabVIEW軟件初步做了故障診斷系統(tǒng)的開發(fā),并進(jìn)行了驗(yàn)證。 航天軸承摩擦力矩的影響因素多,涉及面廣,隨機(jī)性比較強(qiáng),相互作用復(fù)雜,以及對環(huán)境工況極其敏感,是個(gè)難度很大的研究課題。本文是在前人研究的基礎(chǔ)上做出了進(jìn)一步的研究分析,初步找出了診斷該類靈敏軸承單一缺陷的有效的方法,并且在軟件開發(fā)系統(tǒng)中進(jìn)行了驗(yàn)證,這為依據(jù)摩擦力矩進(jìn)行航天軸承故障診斷的深入研究打下了基礎(chǔ)。
[Abstract]:Space bearing is a kind of bearing which requires the highest friction moment. Among them, the starting friction moment and dynamic friction moment of the gyroscope frame sensitive bearing and the stability of the gyroscope are very important to the precision and stability of the gyroscope instrument. Furthermore, it plays an important role in control system performance and spacecraft safety. For micro spaceflight sensitive bearings, machining defects and surface scratches in such aspects as raceway roundness, roughness, grinding wire flow, radial clearance and groove shape of the inner and outer ring will all affect the starting and running torque of the bearing. Causes the bearing friction torque to appear "big spot", "dead point" and the fluctuation, even causes the ball. Therefore, through research and analysis, it is necessary to use various effective methods to diagnose the failure of space bearing caused by these factors, which is necessary to improve the quality of space bearing and ensure the life and reliability of spacecraft. Reducing economic losses is of great practical significance. In view of the important effect of friction torque on the working condition of gyroscope frame sensitive bearings, the dynamic friction torque waveform of two types of bearings is collected by using LSD-I dynamic friction torque tester, which is not good for the inner and outer ring groove shape. The internal circle roundness, inner ring roughness, internal ring grinding wire flow and other single defects of friction torque waveform were analyzed and studied. Using Fourier transform, wavelet analysis and statistics and other mathematical tools to analyze the time-domain frequency domain, probability density function analysis, power spectrum analysis, envelope spectrum analysis and other parameters calculation, trying to find out the waveform characteristics for various defects. Thus, a preliminary criterion for diagnosing the technological defects with the friction torque characteristics of spaceflight bearings is obtained, and an effective diagnostic method is formed. Finally, the fault diagnosis system is developed with LabVIEW software and verified. There are many factors affecting friction moment of space bearing, which involves a wide range of aspects, is relatively strong randomness, complex interaction, and extremely sensitive to environmental conditions, it is a very difficult research topic. On the basis of previous research, this paper makes further research and analysis, and preliminarily finds out the effective method to diagnose the single defect of this kind of sensitive bearing, and verifies it in the software development system. This lays a foundation for the further research of space bearing fault diagnosis based on friction moment.
【學(xué)位授予單位】：河南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：V229.2;TH165.3

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