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  本文選題：波箔型軸承 + 氣體潤滑��； 參考：《哈爾濱工業(yè)大學(xué)》2012年碩士論文

【摘要】：波箔型軸承是一種采用柔性支承表面的自作用式氣體動(dòng)壓軸承，結(jié)合耐高溫固體潤滑技術(shù)，使之具有許多優(yōu)異特點(diǎn)：轉(zhuǎn)速高、無污染、自適應(yīng)好、工作溫度范圍寬、結(jié)構(gòu)簡單、穩(wěn)定性好以及壽命長等。箔片軸承在航空航天、國防、精密制造、低溫制冷等領(lǐng)域具有廣闊的應(yīng)用前景和巨大的經(jīng)濟(jì)價(jià)值。然而，由于箔片軸承自身結(jié)構(gòu)和氣彈耦合問題的復(fù)雜性，其動(dòng)靜態(tài)性能的研究一直處于不斷完善的過程中。 考慮氣體可壓縮性和箔片彈性變形建立第一代波箔型徑向氣體軸承理論分析模型；采用有限差分法和松弛迭代法耦合求解氣膜厚度方程以及壓力控制Reynolds方程；氣膜壓力、氣膜厚度以及載荷數(shù)值計(jì)算結(jié)果與國外文獻(xiàn)對比，表明模型的精確性。 對波箔型軸承進(jìn)行靜態(tài)特性分析：計(jì)算得到了氣膜壓力、氣膜厚度、承載力、偏位角以及摩擦力矩等隨轉(zhuǎn)速、長徑比的變化規(guī)律；對比箔片軸承和剛性表面軸承氣膜壓力和氣膜厚度分布特點(diǎn)，表明箔片軸承具有更高的承載力和穩(wěn)定性。 采用攝動(dòng)法并結(jié)合氣體潤滑Reynolds方程，考慮氣體可壓縮性、箔片變形以及箔片摩擦等因素推導(dǎo)出箔片軸承動(dòng)態(tài)系數(shù)計(jì)算微分方程組。采用有限差分法和松弛迭代法耦合求解，，獲得波箔型氣體軸承的動(dòng)態(tài)系數(shù)。將所得結(jié)果與已公布的實(shí)驗(yàn)對比，證明了該模型的合理性和精確性。分析了波箔型軸承動(dòng)態(tài)特性隨轉(zhuǎn)速、偏心率、渦動(dòng)頻率、長徑比以及箔片柔度系數(shù)和摩擦系數(shù)的變化規(guī)律。 建立了波箔型氣體軸承-Jeffcott剛性轉(zhuǎn)子系統(tǒng)的動(dòng)力學(xué)方程，運(yùn)用Newmark-β數(shù)值方法分析轉(zhuǎn)速、偏心率、不平衡量、半徑間隙以及波箔剛度對系統(tǒng)動(dòng)力學(xué)特性的影響，為今后轉(zhuǎn)子-箔片軸承系統(tǒng)的設(shè)計(jì)和分析提供了理論基礎(chǔ)。
[Abstract]:Wave foil bearing is a kind of self-acting pneumatic hydrodynamic bearing with flexible supporting surface. Combined with high temperature resistance solid lubrication technology, it has many excellent features: high speed, no pollution, good adaptability, wide temperature range and simple structure. Good stability and long life. Foil bearings have broad application prospects and great economic value in aerospace, national defense, precision manufacturing, low temperature refrigeration and other fields. However, due to the complexity of the structure and Aeroelastic coupling of foil bearings, The research of dynamic and static performance has been in the process of continuous improvement. Considering the compressibility of gas and the elastic deformation of foil, the theoretical analysis model of the first generation wave foil radial gas bearing is established. The finite difference method and relaxation iteration method are used to solve the film thickness equation and the pressure control Reynolds equation, and the numerical results of film pressure, film thickness and load are compared with the foreign literatures. The accuracy of the model is demonstrated. The static characteristics of wave foil bearing are analyzed. The variation of film pressure, film thickness, bearing capacity, offset angle and friction moment with rotating speed and aspect ratio are obtained. Compared with the film pressure and film thickness distribution of foil bearing and rigid surface bearing, it shows that foil bearing has higher bearing capacity and stability. The compressibility of gas is considered by using perturbation method and gas lubrication Reynolds equation. The differential equations for calculating the dynamic coefficients of foil bearings are derived from such factors as foil deformation and chaff friction. The finite difference method and relaxation iterative method are used to solve the dynamic coefficient of foil gas bearing. The rationality and accuracy of the model are proved by comparing the results with the published experiments. The dynamic characteristics of the foil bearing with rotating speed, eccentricity, vortex frequency, ratio of length to diameter, foil flexibility coefficient and friction coefficient are analyzed. The dynamic equations of the wave-foil gas bearing -Jeffcott rigid rotor system are established. Newmark- 尾 numerical method is used to analyze the effects of rotational speed, eccentricity, unbalance, radius clearance and foil stiffness on the dynamic characteristics of the system, which provides a theoretical basis for the design and analysis of rotor foil bearing system in the future.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH133.37

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本文編號：2002174