發(fā)布時(shí)間：2018-07-28 14:59

【摘要】：針對(duì)傳統(tǒng)擠壓油膜阻尼器擠壓油膜高度非線性的問題，本文對(duì)新型含浮環(huán)式擠壓油膜阻尼器（FSFD）及其轉(zhuǎn)子系統(tǒng)動(dòng)力特性進(jìn)行了研究，研究成果對(duì)航空發(fā)動(dòng)機(jī)的減振有重要意義。主要研究成果和相關(guān)結(jié)論如下： （1）基于廣義雷諾方程、壁面摩擦方程和Hirs整體流動(dòng)理論，，推導(dǎo)了含浮環(huán)式擠壓油膜阻尼器內(nèi)、外層油膜的穩(wěn)態(tài)雷諾方程。根據(jù)內(nèi)、外層油膜壓力平衡關(guān)系，建立了FSFD模型，為FSFD動(dòng)力特性分析提供了較好的理論基礎(chǔ)。 （2）根據(jù)本文的理論模型，基于有限差分法編寫了計(jì)算程序，研究分析了含浮環(huán)式擠壓油膜阻尼器結(jié)構(gòu)和油膜參數(shù)對(duì)其特性的影響。研究表明：在偏心率越小、油膜寬度越寬、油膜間隙越大時(shí)，F(xiàn)SFD的等效阻尼越大；等效油膜阻尼隨著供油溫度的升高而減小。與傳統(tǒng)擠壓油膜阻尼器相比，本文的FSFD明顯改善了非線性特性。 （3）考慮到油膜力的非線性，建立FSFD-單轉(zhuǎn)子模型，仿真計(jì)算了其臨界轉(zhuǎn)速、穩(wěn)態(tài)不平衡響應(yīng)、非協(xié)調(diào)進(jìn)動(dòng)響應(yīng)和突加不平衡響應(yīng)。計(jì)算結(jié)果表明：含F(xiàn)SFD的轉(zhuǎn)子系統(tǒng)穩(wěn)態(tài)不平衡響應(yīng)明顯小于不含F(xiàn)SFD的轉(zhuǎn)子系統(tǒng)，表明FSFD減振效果較好；計(jì)算了不平衡量、轉(zhuǎn)速、浮環(huán)質(zhì)量、滑油粘度、油膜寬度、油膜間隙對(duì)FSFD-轉(zhuǎn)子系統(tǒng)的非協(xié)調(diào)進(jìn)動(dòng)的影響，由轉(zhuǎn)子響應(yīng)分岔圖可以看出，隨著不平衡量的減小、滑油粘度系數(shù)的增加、浮動(dòng)環(huán)油膜間隙的減小、油膜寬度的增加，轉(zhuǎn)子的非協(xié)調(diào)進(jìn)動(dòng)響應(yīng)范圍逐漸減小，選擇合適的浮動(dòng)環(huán)質(zhì)量可以抑制FSFD-轉(zhuǎn)子系統(tǒng)的非協(xié)調(diào)進(jìn)動(dòng)響應(yīng)；仿真計(jì)算了轉(zhuǎn)速、彈支剛度及浮環(huán)質(zhì)量對(duì)FSFD-轉(zhuǎn)子系統(tǒng)突加不平衡響應(yīng)的影響，F(xiàn)SFD在抑制突加不平衡響應(yīng)方面明顯強(qiáng)于傳統(tǒng)擠壓油膜阻尼器。 （4）利用雙向激勵(lì)試驗(yàn)器，對(duì)FSFD動(dòng)力特性進(jìn)行了試驗(yàn)驗(yàn)證，研究了激振力大小、油膜間隙、供油壓力及油膜寬度對(duì)油膜壓力的影響。試驗(yàn)結(jié)果與理論計(jì)算結(jié)果具有很好的一致性，由此證明了本文模型的正確性，對(duì)工程應(yīng)用有很好的指導(dǎo)意義。 本文研究?jī)?nèi)容對(duì)FSFD及FSFD-轉(zhuǎn)子系統(tǒng)動(dòng)力特性的研究提供了很好的理論基礎(chǔ)。有很好的工程應(yīng)用前景。
[Abstract]:Aiming at the problem of high nonlinearity of squeeze film in traditional squeeze film damper, the dynamic characteristics of (FSFD) and its rotor system with floating ring type squeeze film damper are studied in this paper. The research results are of great significance to the vibration reduction of aero-engine. The main research results and related conclusions are as follows: (1) based on the generalized Reynolds equation, wall friction equation and Hirs flow theory, the steady-state Reynolds equation of the outer layer oil film in the squeeze film damper with floating ring is derived. According to the pressure balance relationship between the inner and outer layers of oil film, the FSFD model is established, which provides a good theoretical basis for the analysis of the dynamic characteristics of FSFD. (2) according to the theoretical model of this paper, the calculation program is compiled based on the finite difference method. The influence of the structure and the film parameters of the squeeze film damper with floating ring on its characteristics was studied. The results show that when the eccentricity is smaller, the width of oil film is wider and the gap of oil film is larger, the equivalent damping of FSFD increases, and the equivalent oil film damping decreases with the increase of oil supply temperature. Compared with the traditional squeeze film damper, the FSFD in this paper improves the nonlinear characteristic obviously. (3) considering the nonlinearity of the oil film force, the FSFD-single rotor model is established, and the critical speed and the steady state unbalance response are simulated and calculated. Uncoordinated precession response and sudden unbalanced response. The results show that the steady-state unbalance response of the rotor system with FSFD is obviously smaller than that of the rotor system without FSFD, which indicates that the FSFD has better vibration absorption effect, and calculates the unbalance, the speed, the mass of floating ring, the viscosity of oil and the width of oil film. The effect of oil film clearance on the uncoordinated precession of FSFD-rotor system can be seen from the rotor response bifurcation diagram. It can be seen that with the decrease of unbalance, the increase of oil viscosity coefficient, the decrease of oil film clearance of floating ring, and the increase of oil film width, The uncoordinated precession response range of the rotor decreases gradually, and the uncoordinated precession response of the FSFD-rotor system can be restrained by choosing the appropriate floating ring mass. Effect of elastic stiffness and floating ring mass on the sudden unbalance response of FSFD-rotor system FSFD is obviously better than the conventional squeeze film damper in suppressing the sudden unbalance response. (4) A bidirectional excitation tester is used. The dynamic characteristics of FSFD were tested and the effects of exciting force, oil film clearance, oil supply pressure and oil film width on the film pressure were studied. The experimental results are in good agreement with the theoretical results, which proves the correctness of the model in this paper and has a good guiding significance for engineering application. This paper provides a good theoretical basis for the study of dynamic characteristics of FSFD and FSFD-rotor systems. It has a good prospect of engineering application.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TB535.1

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