本文選題：柔性鉸鏈可傾瓦軸承 + 軸心軌跡　； 參考：《山東大學(xué)》2017年碩士論文

【摘要】：可傾瓦軸承是滑動(dòng)軸承的一種,其具有噪音小、摩擦功耗小、運(yùn)轉(zhuǎn)平穩(wěn)等特點(diǎn),但這種軸承因結(jié)構(gòu)缺陷而造成了大量的事故,因此需要對(duì)其結(jié)構(gòu)形式進(jìn)行改進(jìn)創(chuàng)新。柔性鉸鏈可傾瓦軸承是一種新形式的可傾瓦軸承,將軸瓦與軸承主體通過(guò)柔性鉸鏈連接,進(jìn)行一體化加工,代替擺動(dòng)支點(diǎn),既摒棄了普通可傾瓦軸承的機(jī)構(gòu)復(fù)雜、非承載瓦空載時(shí)具有不穩(wěn)定性等諸多缺點(diǎn),同時(shí)具備了它的各種優(yōu)良特性,具有明顯的優(yōu)勢(shì)。本論文基于柔性鉸鏈可傾瓦軸承,對(duì)柔性鉸鏈結(jié)構(gòu)、軸承動(dòng)靜特性及實(shí)現(xiàn)預(yù)定軌跡的主動(dòng)控制方法進(jìn)行了詳細(xì)的研究,并利用實(shí)驗(yàn)臺(tái)得出了轉(zhuǎn)子的非線性軸心軌跡。主要的研究?jī)?nèi)容有以下幾點(diǎn):首先,本文通過(guò)有限差分方法根據(jù)雷諾方程計(jì)算了軸承的油膜壓力分布與油膜合力。運(yùn)用三維制圖軟件對(duì)軸瓦鉸鏈結(jié)構(gòu)進(jìn)行建模,并使用有限元法分析了其固有頻率等結(jié)構(gòu)特性,然后用實(shí)驗(yàn)的方法測(cè)量了軸瓦的固有頻率,將實(shí)驗(yàn)數(shù)據(jù)與模擬仿真結(jié)果進(jìn)行對(duì)比,最終得到了柔性鉸鏈結(jié)構(gòu)剛度與阻尼系數(shù)。其次,本文基于柔性鉸鏈可傾瓦軸承轉(zhuǎn)子重力、非線性油膜力以及所受動(dòng)載荷建立了轉(zhuǎn)子運(yùn)動(dòng)模型,運(yùn)用歐拉算法得出了轉(zhuǎn)子在一段時(shí)間內(nèi)完整的非線性軸心軌跡,同時(shí)運(yùn)用四階五級(jí)Runge-Kutta-Felhberg算法得出了四個(gè)軸瓦的擺動(dòng)規(guī)律。在考慮軸瓦擺動(dòng)自由度的前提下計(jì)算出了軸承的八個(gè)折合動(dòng)特性系數(shù),并將非線性軸心軌跡與動(dòng)特性的計(jì)算方法結(jié)合,計(jì)算出了系統(tǒng)在特定工況前提下的隨時(shí)間變化的動(dòng)特性系數(shù),即連續(xù)動(dòng)特性。然后,本文提出了在軸瓦瓦背安裝壓電致動(dòng)裝置的主動(dòng)控制方法。通過(guò)控制軸瓦擺角抑制轉(zhuǎn)子振動(dòng)。計(jì)算了軸瓦擺角規(guī)律改變對(duì)非線性軸心軌跡的影響,并推導(dǎo)了壓電裝置施加控制力與軸瓦擺角的關(guān)系。提出了基于預(yù)定軸心軌跡的軸瓦擺角計(jì)算方法,根據(jù)預(yù)定軌跡計(jì)算出了特定軸瓦的擺動(dòng)規(guī)律,并進(jìn)行了仿真驗(yàn)證。最后,本文搭建了柔性鉸鏈可傾瓦軸承轉(zhuǎn)子系統(tǒng)實(shí)驗(yàn)臺(tái),運(yùn)用電渦流傳感器和測(cè)試儀器對(duì)不同轉(zhuǎn)速下轉(zhuǎn)子的非線性軸心軌跡進(jìn)行了測(cè)試,并通過(guò)設(shè)計(jì)濾波器對(duì)所測(cè)數(shù)據(jù)進(jìn)行了分析處理,得出了實(shí)際工況條件下的非線性軸心軌跡。本文的研究對(duì)柔性鉸鏈可傾瓦軸承的現(xiàn)實(shí)應(yīng)用與主動(dòng)控制具有較大的現(xiàn)實(shí)價(jià)值。
[Abstract]:The tilting bearing is a kind of sliding bearing, which has the characteristics of small noise, small friction power and smooth operation. But this kind of bearing has caused a lot of accidents because of structural defects. Therefore, it needs to improve its structure. The flexible hinge tilting bearing is a new form of tilting bearing, which passes the axle bush to the bearing body. Flexible hinges are joined together to carry out integrated machining, instead of swinging pivot, which not only discards the complicated mechanism of the ordinary tilting bearing bearing, but also has many advantages, such as the unstability of the non bearing tile, and has its distinct advantages. This paper is based on the flexible hinge bearing, the flexible hinge structure and the bearing. The dynamic and static characteristics and the active control method to realize the predetermined trajectory are studied in detail, and the nonlinear axis trajectory of the rotor is obtained by using the experimental platform. The main research contents are as follows: first, the paper calculates the oil film pressure distribution of the bearing and the combined force of the oil film by the Reynolds equation by the finite difference method. The structure of the axle bush hinge is modeled by the software, and the natural frequency and other structural characteristics are analyzed by the finite element method. Then the inherent frequency of the axle bush is measured by the experimental method. The stiffness and damping coefficient of the flexible hinge are obtained by comparing the experimental data with the simulation results. Secondly, this paper is based on the flexure hinges. The rotor motion model is established for the rotor gravity, nonlinear oil film force and the dynamic load of the bearing. The whole nonlinear axis trajectory of the rotor in a period of time is obtained by Euler algorithm. The four order five grade Runge-Kutta-Felhberg algorithm is used to get the swing law of the four axle bush. The eight dynamic characteristic coefficients of the bearing are calculated, and the dynamic characteristic coefficient of the system is calculated under the precondition of a specific working condition, that is, the continuous dynamic characteristic. Then, the active control method of the piezoelectric actuating device on the back of the axis is put forward. The vibration of the rotor is controlled by the control of the swing angle of the axle bush. The influence of the change of the swing angle of the Bush on the trajectory of the nonlinear axis is calculated. The relation between the control force exerted by the piezoelectric device and the swing angle of the axle bush is derived. The calculation method of the swing angle of the axle bush based on the trajectory of the predetermined axis is put forward, and the swing law of the specific axle bush is calculated and the method is carried out according to the predetermined trajectory. Finally, the experiment platform of the flexible hinge tilting bearing rotor system is built in this paper, and the eddy current sensor and test instrument are used to test the nonlinear axis trajectory of the rotor at different speeds, and the analysis of the measured data is carried out by the design filter, and the nonlinear axis under the actual working condition is obtained. The research in this paper has great practical value for the practical application and active control of flexible hinge tilting pad bearings.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH133.3

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本文編號(hào)：1939813