本文選題：磁流變減振器　切入點(diǎn)：熱耦合仿真　出處：《湘潭大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著汽車技術(shù)智能化水平的快速提高,汽車的NVH(Noise、Vibration、Harshness)問題及舒適性日益受到人們的關(guān)注,這對汽車懸架的開發(fā)與設(shè)計(jì)提出了更高的挑戰(zhàn)。磁流變減振器以MR流體為工作介質(zhì),具有優(yōu)良的電磁可控性,能為懸架智能控制提供良好的電-機(jī)耦合接口并能改善車身振動及提高舒適性。但,在汽車高速行駛時(shí),懸架減振器將因吸收振動能量而使工作介質(zhì)出現(xiàn)較嚴(yán)重的發(fā)熱,從而導(dǎo)致阻尼特性的惡化。本文基于Tiguan(途觀)汽車前、后懸架的阻尼要求,設(shè)計(jì)了一款采用橫向工作間隙的活塞內(nèi)流道磁流變減振器(MRD),以此為本體展開其在汽車行駛時(shí)達(dá)到熱平衡狀態(tài)下的阻尼特性研究,試圖為MRD在汽車半主動懸架上的應(yīng)用提供一定的理論依據(jù)。具體工作如下:1、首先通過考慮提升MRD的阻尼力,拓寬阻尼調(diào)節(jié)區(qū)間的目標(biāo)下,對減振器的本體結(jié)構(gòu)進(jìn)行了改進(jìn)和優(yōu)化,得出了其改進(jìn)后關(guān)鍵零部件的結(jié)構(gòu)參數(shù);并推導(dǎo)了阻尼力計(jì)算的數(shù)學(xué)模型,通過對磁路分析計(jì)算了繞線圈的匝數(shù)。2、基于AMESim仿真平臺結(jié)合本文設(shè)計(jì)的減振器結(jié)構(gòu)尺寸,搭建了MRD的熱效應(yīng)仿真模型;通過一階白噪聲濾波系統(tǒng)模擬路面激勵,分析了汽車以不同速度在不同路面行駛時(shí)MRD缸筒內(nèi)流體達(dá)到熱平衡的溫度。3、在上述工作基礎(chǔ)上,建立了MRD缸筒內(nèi)流體的三維實(shí)體仿真模型,運(yùn)用ICEM軟件對模型進(jìn)行了結(jié)構(gòu)化網(wǎng)格劃分;通過ANSYS CFX瞬態(tài)移動網(wǎng)格模擬活塞振動并耦合熱平衡溫度從流體的角度計(jì)算了MRD的示功曲線,結(jié)果顯示隨著車速的增加,MRD的阻尼特性有較大程度的下降。4、最后通過恒溫加熱模擬減振器的熱平衡溫度在振動試驗(yàn)臺上對MRD的阻尼特性進(jìn)行了測試,測試結(jié)果與仿真結(jié)論基本吻合,通過對比MRD室溫下不考慮工作熱平衡溫度的測試曲線,可知相同電流下減振器考慮熱-溫效應(yīng)的阻尼力有較明顯的下降,車速越高下降越大,因此車輛在實(shí)際使用減振器時(shí)應(yīng)考慮熱平衡溫度這一因素的影響。此外根據(jù)試驗(yàn)曲線可以推斷,振動試驗(yàn)臺自身的振動可影響示功曲線的飽滿性,測試時(shí)可相應(yīng)的提高試驗(yàn)臺的剛度。
[Abstract]:With the rapid improvement of the intelligent level of automobile technology, people pay more and more attention to the problem and comfort of vehicle NVHN NoiseVibrationVibration.This poses a higher challenge to the development and design of automobile suspension. Mr fluid is used as the working medium for Mr damper. It has excellent electromagnetic controllability, can provide good electric-mechanical coupling interface for suspension intelligent control, and can improve body vibration and comfort. The shock absorber of suspension will cause serious heating in working medium because of absorbing vibration energy, which will lead to the deterioration of damping characteristics. This paper bases on the damping requirement of front and rear suspension of Tiguan vehicle. A magnetic rheological damper (MRD) with transverse working clearance is designed to study the damping characteristics of a piston with heat balance when it is running. This paper attempts to provide some theoretical basis for the application of MRD in automobile semi-active suspension. The specific work is as follows: 1. First of all, by considering raising the damping force of MRD, we can broaden the damping regulation range. The body structure of the damper is improved and optimized, and the structural parameters of the key parts after the improvement are obtained, and the mathematical model of the damping force calculation is derived. By analyzing the magnetic circuit, the turn number of winding coil is calculated. Based on the AMESim simulation platform, the thermal effect simulation model of MRD is built, and the road excitation is simulated by the first order white noise filter system. In this paper, the temperature of heat balance in MRD cylinder is analyzed when the vehicle is driving at different speeds on different roads. On the basis of the above work, a three-dimensional solid simulation model of the fluid in MRD cylinder is established. The model is structured meshed with ICEM software, the ANSYS CFX transient moving grid is used to simulate the piston vibration and the thermal equilibrium temperature is coupled to calculate the power curve of MRD from the point of view of fluid. The results show that the damping characteristic of MRD decreases to a large extent with the increase of speed. Finally, the damping characteristics of MRD are tested on the vibration test rig by using the constant temperature heating to simulate the thermal equilibrium temperature of the damper. The test results are in good agreement with the simulation results. By comparing the test curves with MRD at room temperature without considering the working thermal equilibrium temperature, it is known that the damping force of the damper considering the thermo-temperature effect has a more obvious decrease under the same current, and the higher the speed is, the greater the decrease is. Therefore, the influence of heat balance temperature should be taken into account in the actual use of shock absorber. In addition, it can be inferred from the test curve that the vibration of the vibration test rig itself can affect the fullness of the indicator curve. The stiffness of the test bench can be improved accordingly.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U463.33
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本文編號：1607588