車輛動力系統之懸置減振設計方法

On the Design Method of Mounting System for Automotive Powertrain Vibration Isolation

宋傳榮(Chung-Rung Sung)

指導教授 ： 劉霆

國立臺灣大學/工學院/機械工程學研究所/碩士(2013年)

https://doi.org/10.6342/NTU.2013.02207

摘要

本研究以設計良好的懸置減振系統為目標，結合能量解耦法及控制加速度最小之設計，達到減振的功能。首先以Lagrange方程建立六自由度懸置模型，並針對動力系統所產生的激勵進行分析，建立激勵源數學模型。接著，分析在各操作情形下主要的激勵來源與動力總成懸置系統的振動特性，結果顯示出傳動系的重要性。最後針對懸置剛度進行最佳化調整，分別在能量解耦率最高、振動傳遞率最小、加速度值最小等不同目標函數下，比較何者具較佳之減振效果。結果顯示以能量解耦法結合控制加速度最小，在垂直方向上能達最佳之減振效果。但扭矩方向上受到頻率與剛度上的限制，並無顯著的減振效果。同時，利用振動傳遞率與懸置的受力情形來輔助評斷，建立動力總成懸置系統的設計流程與評估的準則。此研究成果有助於車輛懸置系統之設計，提升NVH性能。

關鍵字

懸置系統 ； 能量解耦 ； 振動傳遞率 ； 加速度 ； 最佳化 ； 設計流程

並列摘要

The purpose of this study is to design a good vibration isolated mounting system, using decoupled method and minimizing the acceleration of vibration to achieve better performance. This paper starts with constructing six-degree mounting system model by Lagrange’s equations and with dynamic model of excitations, especially focused on the vibration caused by the whole powertrain. Then, analyze the mounting system’s vibration characteristics at different working area to find the main excitation at each condition. The results show that the importance of considering powertrain vibrations. Finally, each mounting stiffness parameters are optimized by different object functions; including highest energy decouple rate, minimum vibration transmissibility and acceleration at mass. After the comparison among these methods, the results show that combined with decoupled method and control the acceleration to minimum could get the best performance. Acceleration and displacement decrease remarkably in vertical direction. However, with the constraints of frequency and stiffness, there is no improvement in torsional direction. Vibration transmissibility and the force acting at each mount are also the standards to evaluate the mounting system, and then design flow and standards can be constructed. This study could be applied in mounting system design of automobile and increase NVH characteristics.

並列關鍵字

mounting system ； decouple method ； vibration transmissibility ； optimization ； acceleration ； design flow

參考文獻

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[10] ISO 2631-1, “Mechanical vibration and shock-Evaluation of human exposure to whole-body vibration”, International Standard,1997-05-01.