本文選題：滾動軸承　切入點(diǎn)：動力學(xué)　出處：《重慶大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：滾動軸承是一種重要的基礎(chǔ)機(jī)械部件，在現(xiàn)代機(jī)器中廣泛應(yīng)用，軸承的運(yùn)行狀態(tài)對整個機(jī)械系統(tǒng)的動力學(xué)性能起到非常重要的作用,軸承的振動不僅直接影響主機(jī)的精度，而且影響轉(zhuǎn)子系統(tǒng)的運(yùn)行狀態(tài)，同時發(fā)出的噪聲還將污染周圍環(huán)境，隨著傳動系統(tǒng)向高可靠性和高速靜音方向發(fā)展，對軸承系統(tǒng)的振動和噪聲提出了愈來愈高的要求。 雖然現(xiàn)代加工工藝和加工精度得到了明顯改善和提高，但波紋度作為軸承分布式加工缺陷，仍然是激勵滾動軸承振動噪聲的主要因素之一。針對這個問題，本文提出了一種新的軸承聲振耦合算法，可應(yīng)用于軸承-軸承座系統(tǒng)振動聲學(xué)特征的預(yù)測，具有計算效率高的優(yōu)點(diǎn)；基于提出的新的軸承聲振耦合算法，分析研究了軸承內(nèi)、外圈波紋度參數(shù)變化對軸承-軸承座系統(tǒng)振動聲學(xué)特性的影響，獲得了一些有價值的結(jié)論。論文的主要研究內(nèi)容如下： ①基于Hertz接觸理論和軸承運(yùn)動學(xué)的關(guān)系，推導(dǎo)了滾動軸承承載區(qū)的非線性接觸力計算公式，并基于將軸承座內(nèi)表面考慮為一微質(zhì)量的剛性介質(zhì)層且存在剛性振動的假設(shè)，建立了六自由度滾動軸承動力學(xué)模型，為進(jìn)一步進(jìn)行軸承的動力學(xué)分析奠定了基礎(chǔ)； ②提出了軸承座內(nèi)表面位移映射法，運(yùn)用六自由度滾動軸承動力學(xué)模型，求解獲得軸承系統(tǒng)各部件振動位移；通過軸承座內(nèi)表面位移映射法，實(shí)現(xiàn)了軸承動力學(xué)模型的位移輸出和軸承座有限元模型的位移激勵輸入的耦合，簡化了耦合計算，提高了計算效率； ③建立軸承-軸承座系統(tǒng)的有限元分析模型，研究了正常軸承激勵下的軸承座振動響應(yīng)；建立了軸承座聲學(xué)邊界元分析模型，以軸承座結(jié)構(gòu)表面振動響應(yīng)為邊界條件，研究了正常軸承激勵下的軸承座表面聲學(xué)量及輻射場點(diǎn)噪聲，，并通過軸承振動和噪聲實(shí)驗驗證了本文提出的聲振耦合算法； ④運(yùn)用本文提出的軸承聲振耦合新算法，針對內(nèi)、外圈波紋度對軸承系統(tǒng)振動聲學(xué)特性影響的問題，研究了波紋度參數(shù)-波紋度最大幅值和波數(shù)變化對軸承-軸承座系統(tǒng)的振動響應(yīng)和聲學(xué)特征的影響，為軸承的設(shè)計和制造研究提供了理論依據(jù)。 本文提出的軸承聲振耦合算法可用于預(yù)測軸承-軸承座系統(tǒng)振動聲學(xué)特征，計算快速、簡便，效率高，分析獲得的軸承內(nèi)、外圈波紋度參數(shù)變化對軸承-軸承座系統(tǒng)振動聲學(xué)特征影響的結(jié)果，為軸承的設(shè)計和制造研究提供了理論依據(jù)，具有一定的學(xué)術(shù)意義和重要的工程應(yīng)用價值。
[Abstract]:Rolling bearing is an important basic mechanical component, which is widely used in modern machine. The running state of bearing plays a very important role in the dynamic performance of the whole mechanical system. The vibration of the bearing not only directly affects the accuracy of the main engine, Moreover, the operating state of the rotor system is affected and the noise emitted will pollute the surrounding environment. With the development of the transmission system towards high reliability and high speed silence, the vibration and noise of the bearing system are demanded more and more. Although modern machining technology and machining precision have been improved obviously, corrugation, as a distributed machining defect of bearings, is still one of the main factors to stimulate the vibration and noise of rolling bearings. In this paper, a new acoustic-vibration coupling algorithm for bearing is proposed, which can be used to predict the acoustic characteristics of bearing bearing bearing seat system, and has the advantage of high calculation efficiency. The influence of the corrugation parameters of outer ring on the vibration acoustics of bearing-bearing bearing seat system is studied. Some valuable conclusions are obtained. The main contents of this paper are as follows:. Based on the relation between Hertz contact theory and bearing kinematics, the nonlinear contact force calculation formula of bearing bearing is derived, and the assumption that the inner surface of bearing seat is considered as a rigid medium layer with small mass and rigid vibration is assumed. The dynamic model of six degrees of freedom rolling bearings is established, which lays a foundation for further dynamic analysis of bearings. (2) the displacement mapping method of the inner surface of the bearing seat is put forward, and the vibration displacement of each component of the bearing system is obtained by using the dynamic model of the rolling bearing with six degrees of freedom, and the displacement mapping method of the inner surface of the bearing seat is used. The coupling of the displacement output of the bearing dynamic model and the displacement excitation input of the finite element model of the bearing seat is realized, which simplifies the coupling calculation and improves the calculation efficiency. (3) the finite element analysis model of bearing-bearing bearing system is established, the vibration response of bearing under normal excitation is studied, the acoustic boundary element analysis model of bearing seat is established, and the vibration response of bearing structure is taken as boundary condition. The acoustics and radiation field noise on the bearing seat surface under normal bearing excitation are studied, and the acousto-vibration coupling algorithm proposed in this paper is verified by the bearing vibration and noise experiments. 4 using the new acoustic-vibration coupling algorithm proposed in this paper, aiming at the influence of corrugation of inner and outer rings on the vibration acoustic characteristics of bearing system, The effects of the maximum corrugation parameter and wavenumber on the vibration response and acoustic characteristics of bearing-bearing bearing bearing system are studied, which provides a theoretical basis for the design and manufacture of bearings. The acousto-vibration coupling algorithm proposed in this paper can be used to predict the vibration acoustic characteristics of bearing-bearing bearing bearing seat system. The calculation is fast, simple and efficient. The effect of the corrugation parameters of outer ring on the vibration acoustic characteristics of bearing-bearing bearing bearing seat system provides a theoretical basis for the research of bearing design and manufacture, and has certain academic significance and important engineering application value.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH133.33

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