本文關鍵詞： 低頻噪聲 聲固耦合 貢獻度分析 控制措施　出處：《吉林大學》2014年碩士論文　論文類型：學位論文

【摘要】：目前乘用車正朝著輕量化、高速化方向的發(fā)展，這使得汽車噪聲問題變得日漸突出，直接影響了乘坐舒適性。與此同時，人們對乘坐舒適性的要求也不斷提高，導致汽車廠商對汽車的NVH（Noise，Vibration，Harshness，，噪聲，振動，平順性）特性的重視程度不斷提高。有效降低振動噪聲水平已經成為汽車結構設計的一個重要目標。 本文為尋求對車內低頻噪聲的有效抑制途徑，結合校企合作項目“車身聲固耦合振動噪聲分析與控制研究開發(fā)”，對某轎車內飾車身聲固耦合系統(tǒng)的聲振特性進行數(shù)值仿真分析，以貢獻度分析結果為依據(jù)，提出了有效降低車內噪聲的措施。 根據(jù)有限元模型建模原則，建立了白車身有限元模型，通過試驗模態(tài)分析結果驗證了模型的有效性。在此基礎上建立了封閉車身有限元模型。根據(jù)封閉車身有限元模型建立了考慮座椅空間的聲腔模型，通過車內聲腔模態(tài)試驗驗證了聲腔模型的有效性。通過聲腔模型與封閉車身有限元模型，建立了該車的聲固耦合有限元模型，分析對比了車身結構與車內聲腔模型耦合前后的模態(tài)。測試了車身內飾件的聲學性能，并建立了內飾件的有限元模型。進行了實車道路試驗，測試了不同工況下前后懸架、動力總成與排氣系統(tǒng)傳遞到車身的激勵。將這些激勵信號加載到內飾車身聲固耦合模型中對車內噪聲響應進行了仿真分析，仿真結果與試驗結果的誤差在±6%內，說明模型有較高的仿真精度。 針對車內噪聲響應的峰值進行了模態(tài)貢獻度分析與面板貢獻度分析，以分析結果為依據(jù)，提出在敏感位置涂貼阻尼層和采用有機夾層玻璃更換前后風擋玻璃來控制車內噪聲的措施。通過控制措施，車內噪聲響應得到了降低，總聲壓級最大降幅達4.45dB。降噪措施有效。
[Abstract]:At present, passenger cars are moving towards the direction of lightweight and high-speed, which makes the problem of vehicle noise become increasingly prominent, which directly affects ride comfort. At the same time, people's requirements for ride comfort are also increasing. Cause the car manufacturer to make a noise and vibration on the NVHN NoiseNV VibrationN Harshness. The importance of ride comfort) has been increasing. Reducing vibration and noise level effectively has become an important goal of vehicle structure design. In order to find an effective way to restrain the low frequency noise in the vehicle, this paper combines the research and development of the analysis and control of the vehicle body acoustic-solid coupling vibration noise with the cooperation project of school and enterprise. The acoustic and vibration characteristics of a car interior body acoustic-solid coupling system are simulated and analyzed. Based on the results of contribution analysis, the effective measures to reduce the vehicle interior noise are put forward. According to the principle of finite element model modeling, the white body finite element model is established. The validity of the model is verified by the experimental modal analysis results. On this basis, the finite element model of the closed body is established, and the acoustic cavity model considering seat space is established according to the finite element model of the closed body. The validity of the acoustic cavity model is verified by the modal test of the vehicle inner cavity, and the sound structure coupling finite element model of the vehicle is established by the sound cavity model and the closed body finite element model. The modes before and after the coupling of the body structure and the car interior cavity model are analyzed and compared. The acoustic performance of the body interior parts is tested, and the finite element model of the interior parts is established, and the real vehicle road test is carried out. The excitation of front and rear suspension, powertrain and exhaust system transferred to the body under different working conditions was tested. The noise response of the vehicle was simulated by loading these excitation signals into the acoustic solid coupling model of the interior body. The error between the simulation results and the experimental results is within 鹵6%, which shows that the model has high simulation accuracy. Modal contribution analysis and panel contribution analysis are carried out for the peak noise response of the vehicle, which is based on the analysis results. The measures of applying damping layer in sensitive position and replacing front and rear windscreen glass with organic laminated glass are put forward to control the noise in the vehicle. The noise response of the vehicle is reduced by the control measures. The maximum decrease of the total sound pressure level is 4.45 dB. The noise reduction measures are effective.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U467.493;TB535

【參考文獻】

相關期刊論文 前10條

1 張攀;雷剛;廖林清;馮文杰;;某汽車白車身模態(tài)分析[J];重慶工學院學報(自然科學版);2008年03期

2 寧方立;劉更;;車內聲學靈敏度數(shù)值計算新方法研究[J];電聲技術;2008年05期

3 黃昶春;韋志林;沈光烈;尹輝俊;;基于MSC.NASTRAN的點焊模型及其比較分析[J];裝備制造技術;2006年05期

4 高書娜;鄧兆祥;胡玉梅;;基于聲壓靈敏度分析的轎車車內低頻噪聲優(yōu)化[J];吉林大學學報(工學版);2009年05期

5 李波;鄧兆祥;高書娜;;車身結構修改對車內低頻噪聲的影響[J];機械設計與制造;2011年03期

6 劉更;趙冠軍;吳立言;李應生;蔣立冬;;基于聲學貢獻度分析的振動噪聲控制方法研究[J];機械科學與技術;2009年12期

7 馬天飛;高剛;王登峰;潘峰;;基于聲固耦合模型的車內低頻結構噪聲響應分析[J];機械工程學報;2011年15期

8 徐豐辰;李洪林;劉福;;汽車用阻尼材料及其與車身的粘接[J];粘接;2007年05期

9 周長路,范子杰,陳宗渝,桂良進;微型客車白車身模態(tài)分析[J];汽車工程;2004年01期

10 高書娜;鄧兆祥;胡玉梅;;車身點焊連接有限元模擬方法研究[J];汽車工程;2008年09期

相關博士學位論文 前2條

1 高書娜;轎車車身低頻結構聲耦合機理及降噪設計研究[D];重慶大學;2011年

2 孫喜龍;汽車被動安全性的模塊化建模方法與多目標優(yōu)化研究[D];吉林大學;2013年

本文編號：1484185