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  本文關(guān)鍵詞：直線型活塞連桿液壓馬達(dá)主軸振動仿真研究　出處：《大連海事大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 液壓馬達(dá) 有限元 模態(tài)分析 振動響應(yīng)

【摘要】：液壓馬達(dá)作為液壓系統(tǒng)重要執(zhí)行元件,其性能指標(biāo)對整個液壓系統(tǒng)的工作性能有著直接影響,在設(shè)計(jì)液壓馬達(dá)時需要對其各種運(yùn)行性能進(jìn)行優(yōu)化。針對本文提出的一種直線型活塞連桿液壓馬達(dá),其主軸系在運(yùn)轉(zhuǎn)過程中,會受到各種各樣的沖擊力和周期性的脈動力。當(dāng)激勵的頻率與其固有頻率相同時就會發(fā)生共振,這不僅會導(dǎo)致軸系疲勞破壞,還會形成繼發(fā)性激勵,導(dǎo)致其他機(jī)械振動、故障,影響馬達(dá)的平穩(wěn)運(yùn)行。因此,本文提出的直線型活塞連桿液壓馬達(dá)主軸振動的研究,對于液壓馬達(dá)進(jìn)一步的優(yōu)化設(shè)計(jì)以及后期生產(chǎn)制造及正常工作和故障診斷分析等都有重要意義。為此本文主要開展以下工作。提出直線型活塞連桿液壓馬達(dá)概念,對直線型活塞連桿液壓馬達(dá)結(jié)構(gòu)及工作原理進(jìn)行介紹。分析計(jì)算液壓馬達(dá)液壓缸內(nèi)液壓油油壓力、活塞連桿運(yùn)動部件重力產(chǎn)生的激振力、往復(fù)慣性激振力和離心慣性激振力,計(jì)算各激振力的幅值和頻率。分析計(jì)算液壓馬達(dá)旋轉(zhuǎn)運(yùn)動件的轉(zhuǎn)動慣量以及主軸系扭轉(zhuǎn)剛度和縱向剛度。建立液壓馬達(dá)主軸扭轉(zhuǎn)振動及縱向振動模型,并依此得到自由振動和受迫振動方程式,并用Holzer表法對扭轉(zhuǎn)振動固有頻率及相應(yīng)振型進(jìn)行計(jì)算。采用Solidworks軟件對馬達(dá)偏心軸、連桿和活塞進(jìn)行建模,利用Ansys Workbench有限元軟件對其進(jìn)行模態(tài)分析,得到其前10階固有頻率和振型,在對固有頻、率和振型分析的基礎(chǔ)上,提出設(shè)計(jì)工況應(yīng)避開的頻率區(qū)域,并指出容易發(fā)生形變失效的部位,對液壓馬達(dá)的設(shè)計(jì)優(yōu)化提供理論指導(dǎo)。并將仿真結(jié)果與實(shí)際計(jì)算結(jié)果做比較,驗(yàn)證仿真計(jì)算結(jié)果正確。對液壓馬達(dá)偏心軸進(jìn)行約束模態(tài)分析,并施加工作載荷,模擬實(shí)際振動響應(yīng),得到其主要共振頻率,以及相應(yīng)的響應(yīng)幅值。并分析了主軸承寬度,以及主軸承間距對液壓馬達(dá)主軸振動的影響。得出在低頻區(qū)應(yīng)選擇較小的軸承寬度,以減小主軸自由端和功率輸出端的低頻振幅響應(yīng);在不影響液壓缸等其他設(shè)備安裝布置的前提下,應(yīng)減小主軸承間距,以減小主軸振動響應(yīng)幅值。
[Abstract]:As an important component of hydraulic system, hydraulic motor has a direct impact on the performance of the whole hydraulic system. In the design of hydraulic motor, it is necessary to optimize its performance. A linear piston connecting rod hydraulic motor is proposed in this paper, its main shaft is in operation. When the frequency of excitation is the same as its natural frequency, resonance will occur, which will not only lead to fatigue failure of shafting, but also form secondary excitation. Cause other mechanical vibration, failure, affect the smooth operation of the motor. Therefore, this paper proposed a linear piston connecting rod hydraulic motor spindle vibration research. It is of great significance for further optimization design of hydraulic motor, later production and manufacture, normal operation and fault diagnosis analysis. For this reason, the following work is mainly carried out in this paper. The concept of linear piston connecting rod hydraulic motor is put forward in this paper. . This paper introduces the structure and working principle of linear piston connecting rod hydraulic motor, analyzes and calculates the exciting force of hydraulic oil pressure in hydraulic cylinder of hydraulic motor and the gravity of piston connecting rod moving parts. Reciprocating inertial excitation force and centrifugal inertial excitation force. The amplitude and frequency of each exciting force are calculated, and the moment of inertia, torsional stiffness and longitudinal stiffness of hydraulic motor rotating moving parts are analyzed and calculated. The torsional vibration and longitudinal vibration model of hydraulic motor spindle are established. The free vibration and forced vibration equations are obtained, and the natural frequencies and corresponding modes of torsional vibration are calculated by Holzer table method. The eccentric shaft of motor is obtained by Solidworks software. The connecting rod and piston are modeled, and the modal analysis is carried out by using Ansys Workbench finite element software, and the first 10 natural frequencies and modes are obtained. On the basis of the analysis of the rate and mode, the paper points out the frequency region which should be avoided in the design condition, and points out the position where the deformation failure is easy to occur. It provides theoretical guidance for the design optimization of hydraulic motor and compares the simulation results with the actual calculation results to verify the correctness of the simulation results. The eccentric shaft of the hydraulic motor is subjected to constrained modal analysis and applied working load. The main resonance frequency and the corresponding response amplitude are obtained by simulating the actual vibration response, and the width of the main bearing is analyzed. The influence of the main bearing spacing on the vibration of the main shaft of the hydraulic motor is obtained. It is concluded that the lower bearing width should be chosen in the low frequency region to reduce the low frequency amplitude response of the spindle free end and the power output end. Without affecting the installation and arrangement of other equipment such as hydraulic cylinders, the main bearing spacing should be reduced in order to reduce the vibration response amplitude of the spindle.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH137.51

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