【摘要】：液壓系統(tǒng)中,液壓元件振動(dòng)是破壞液壓系統(tǒng)正常工作的根源,而自激振動(dòng)是先導(dǎo)式壓力閥振動(dòng)的三大主要振動(dòng)之一。先導(dǎo)式壓力閥的自激振動(dòng)及其噪聲主要來(lái)源于先導(dǎo)閥,因此開(kāi)展壓力閥自激振動(dòng)研究具有十分重要的意義。 本文通過(guò)分析先導(dǎo)式壓力閥的結(jié)構(gòu)特點(diǎn),建立了先導(dǎo)式壓力閥都具有的錐形閥芯先導(dǎo)閥模型。分析了影響先導(dǎo)閥穩(wěn)定的因素,并利用Bode穩(wěn)定性判據(jù)對(duì)先導(dǎo)閥進(jìn)行穩(wěn)定性判斷,結(jié)果表明:本文中所研究范例先導(dǎo)閥開(kāi)環(huán)穩(wěn)定,閉環(huán)不穩(wěn)定;基于流體對(duì)閥芯的影響,對(duì)閥芯受到流體流動(dòng)誘發(fā)振動(dòng)進(jìn)行理論分析,并對(duì)不同閥腔結(jié)構(gòu)參數(shù)下流場(chǎng)進(jìn)行仿真分析,先導(dǎo)閥前腔阻尼孔偏心和先導(dǎo)閥出口接近閥口都不利于先導(dǎo)閥穩(wěn)定;通過(guò)對(duì)先導(dǎo)式溢流閥進(jìn)行仿真分析,得到了先導(dǎo)閥芯振動(dòng)的頻域特性,先導(dǎo)閥芯振動(dòng)頻率在100Hz至1500Hz之間,500Hz左右振幅出現(xiàn)最大峰值,在700Hz至800Hz之間振幅出現(xiàn)次大峰值,其次在100Hz至300Hz和500Hz至700Hz頻率段振動(dòng)幅值波動(dòng)劇烈。 對(duì)溢流閥閥體模型進(jìn)行了模態(tài)分析和基于先導(dǎo)閥閥芯自激振動(dòng)激勵(lì)下的諧響應(yīng)分析,閥體約束越多連接剛度越高越有利于壓力閥的穩(wěn)定,僅約束進(jìn)出油口時(shí)閥體在600Hz左右出現(xiàn)諧振峰值,且該工況下第一階固有頻率為638Hz,約束閥體三個(gè)進(jìn)出油口時(shí)閥體第一階固有頻率較高,且在0~1200Hz頻率段激勵(lì)下振動(dòng)平穩(wěn)。 通過(guò)對(duì)Y-10B型先導(dǎo)式溢流閥自激振動(dòng)和輻射噪聲進(jìn)行試驗(yàn),得到了溢流閥在不同壓力下的振動(dòng)和噪聲輻射特性,隨著壓力的增大振動(dòng)加劇,閥體振動(dòng)的峰值頻率也增多,并且噪聲輻射強(qiáng)度隨之增大。
[Abstract]:In hydraulic system, the vibration of hydraulic components is the source of destroying the normal operation of hydraulic system, and the self-excited vibration is one of the three main vibration of pilot pressure valve. The self-excited vibration and noise of the pilot pressure valve mainly come from the pilot valve, so it is of great significance to carry out the research on the self-excited vibration of the pressure valve. Based on the analysis of the structural characteristics of the pilot pressure valve, the conical core pilot valve model of the pilot pressure valve is established in this paper. The factors affecting the stability of the pilot valve are analyzed, and the stability of the pilot valve is judged by Bode stability criterion. The results show that the pilot valve studied in this paper is stable in open loop and unstable in closed loop. Based on the influence of fluid on the valve core, the vibration induced by fluid flow is analyzed theoretically, and the flow field under different valve cavity structure parameters is simulated and analyzed. The eccentricity of the damping hole in the front cavity of the pilot valve and the proximity of the outlet of the pilot valve to the valve port are not conducive to the stability of the pilot valve. Through the simulation and analysis of pilot relief valve, the frequency domain characteristics of pilot valve core vibration are obtained. The frequency of pilot valve core vibration is between 100Hz and 1500Hz, and the maximum amplitude of about 500Hz appears, and the second largest amplitude appears between 700Hz and 800Hz. Secondly, the vibration amplitude fluctuates sharply in the frequency range from 100Hz to 300Hz and from 500Hz to 700Hz. The modal analysis of the relief valve body model and the harmonic response analysis based on the self-excited vibration excitation of the pilot valve core are carried out. The higher the connection stiffness of the valve body constraint, the more favorable the stability of the pressure valve. The first order natural frequency of the valve body is 638Hz when the inlet and outlet is confined, and the first order natural frequency of the valve body is 638Hz under this condition. The first natural frequency of the valve body is higher when the three inlet and outlet ports of the valve body are confined, and the vibration of the valve body is stable under the excitation of the 0~1200Hz frequency segment. By testing the self-excited vibration and radiation noise of Y-10B pilot relief valve, the vibration and noise radiation characteristics of relief valve under different pressure are obtained. With the increase of pressure, the peak frequency of valve body vibration is also increased. And the noise radiation intensity increases.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH137.521

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