發(fā)布時(shí)間：2018-04-30 14:59

  本文選題：液壓系統(tǒng) + 壓力脈動(dòng)��； 參考：《長(zhǎng)沙理工大學(xué)》2012年碩士論文

【摘要】：在液壓系統(tǒng)中，由于液壓泵是利用容積變化、交替地排出液壓油來(lái)工作的，其輸出的瞬時(shí)流量是具有周期性的脈動(dòng)流量。當(dāng)這一脈動(dòng)流量遇到系統(tǒng)阻抗后就產(chǎn)生了周期性的壓力脈動(dòng)，并沿管路傳播，產(chǎn)生振動(dòng)和噪聲。抑制液壓系統(tǒng)的壓力脈動(dòng)對(duì)提高系統(tǒng)的可靠性和工作質(zhì)量，對(duì)提高液壓元件的壽命，降低系統(tǒng)的噪聲都有重要的意義。液壓系統(tǒng)的流體脈動(dòng)控制一直是一個(gè)沒(méi)有得到很好解決的技術(shù)難題。在液壓系統(tǒng)中安裝濾波器對(duì)流體脈動(dòng)的衰減能起到很好的效果。本文提出了一種結(jié)構(gòu)簡(jiǎn)單、靈巧的機(jī)械諧振機(jī)構(gòu)，膜片振動(dòng)式流體濾波器。具體研究?jī)?nèi)容包括： 1．提出一種膜片振動(dòng)式流體濾波器結(jié)構(gòu)。分析了液壓系統(tǒng)壓力脈動(dòng)特性；基于動(dòng)力吸振器的作用機(jī)理，設(shè)計(jì)一種結(jié)構(gòu)簡(jiǎn)單、靈巧的機(jī)械諧振機(jī)構(gòu)。對(duì)濾波器的結(jié)構(gòu)進(jìn)行初步設(shè)計(jì)。 2．建立了預(yù)拉伸柔性膜片振動(dòng)的數(shù)學(xué)模型，并求解了柔性膜的固有頻率。使用超彈性膜理論求解了預(yù)拉伸柔性膜片的固有頻率；利用有限元分析軟件ADINA，對(duì)預(yù)拉伸柔性膜片模型進(jìn)行流固耦合模態(tài)分析，研究柔性膜片的流固耦合動(dòng)態(tài)特性，為濾波器的設(shè)計(jì)提供依據(jù)。 3．使用計(jì)算流體力學(xué)方法對(duì)該流體濾波器的衰減特性進(jìn)行仿真分析。通過(guò)對(duì)濾波器模型進(jìn)行簡(jiǎn)化，并設(shè)置相關(guān)仿真參數(shù)，對(duì)模型進(jìn)行瞬態(tài)動(dòng)力學(xué)分析。研究濾波器頻率特性和衰減特性。 4．通過(guò)實(shí)驗(yàn)測(cè)試膜片式流體濾波器的衰減特性。建立了液壓振動(dòng)試驗(yàn)臺(tái)，研制了膜片式濾波器實(shí)驗(yàn)樣機(jī)，，對(duì)濾波器的衰減特性進(jìn)行實(shí)驗(yàn)。并與仿真結(jié)果進(jìn)行對(duì)比分析，說(shuō)明仿真分析的正確性。
[Abstract]:In the hydraulic system, because the hydraulic pump uses the volume change, the hydraulic oil is discharged alternately to work, the instantaneous flow rate of its output is periodic pulsating flow rate. When this pulsating flow rate meets the impedance of the system, it produces periodic pressure pulsation, which propagates along the pipeline, resulting in vibration and noise. It is very important to restrain the pressure pulsation of hydraulic system to improve the reliability and working quality of the system, to improve the life of hydraulic components and to reduce the noise of the system. The control of fluid pulsation in hydraulic system has been a technical problem which has not been solved well. The filter installed in hydraulic system has a good effect on the attenuation of fluid pulsation. In this paper, a simple and dexterous mechanical resonance mechanism, diaphragm vibrating fluid filter, is presented. Specific studies include: 1. A diaphragm vibrating fluid filter structure is proposed. The pressure pulsation characteristics of hydraulic system are analyzed and a simple and dexterous mechanical resonance mechanism is designed based on the mechanism of dynamic vibration absorber. The structure of the filter is preliminarily designed. 2. The mathematical model of the vibration of pretension flexible membrane is established, and the natural frequency of the flexible film is solved. The natural frequency of pretension flexible membrane is solved by using hyperelastic membrane theory, and the fluid-solid coupling modal analysis of pretension flexible membrane model is carried out by using finite element analysis software Adina, and the dynamic characteristics of fluid-structure coupling of flexible membrane are studied. It provides the basis for the design of filter. 3. The attenuation characteristics of the fluid filter are simulated by computational fluid dynamics (CFD) method. By simplifying the filter model and setting the relevant simulation parameters, the transient dynamics of the model is analyzed. The frequency and attenuation characteristics of the filter are studied. 4. The attenuation characteristics of diaphragm fluid filter are measured experimentally. The hydraulic vibration test rig was established and the experimental prototype of the diaphragm filter was developed. The attenuation characteristics of the filter were tested. The simulation results are compared with the simulation results to show the correctness of the simulation analysis.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH137.7

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 賀華波;多薄板振動(dòng)式流體脈動(dòng)衰減器仿真及實(shí)驗(yàn)研究[D];長(zhǎng)沙理工大學(xué);2013年

本文編號(hào)：1825016