劉霆臺灣大學：機械工程學研究所侯傑Hou, ChiehChiehHou2007-11-282018-06-282007-11-282018-06-282007http://ntur.lib.ntu.edu.tw//handle/246246/61518本研究欲瞭解全車阻尼係數的調配與車輛動態特性變化之間的關係，並探討在不同車輛參數數值時，調配全車阻尼係數的方法。首先建立七自由度全車模型，利用D’Alembert法建立系統之運動方程式，並且介紹頻域響應、隨機路面振動響應、凸起路面時域響應的理論推導以及模擬方法和結果。接著用上述三種分析方法探討阻尼對於車輛動態特性的影響，並且利用隨機路面振動響應進行阻尼係數的調配與車輛動態特性變化之間關係之探討。最後，改變車輛不同參數的數值，探討調配阻尼係數的方法。研究中得到調配阻尼係數的評估比較方法以及對於車輛動態特性改善之效果，並且針對車輛參數數值改變時調配阻尼係數的方法。The purpose of the study is to understand the fundamental relationship between the adjustment of damping coefficients and the vehicle ride and handling dynamic characteristics. Firstly, a 7-DOF vehicle model is introduced, and using D’Alembert principle the equations of motion of the system are established. Then, the theory of frequency response, random vibration response, bumper response of the system are introduced. The three different motion responses are used to investigate the effect of damper on vehicle dynamics, and the random vibration response is selected to study the adjustment of damping coefficients on vehicle ride and handling dynamic characteristics. Lastly, the numerical results of adjustment of damping coefficients with different vehicle parameter are studied in order to understand the effects of adjustment of damping coefficients. This study obtains the fundamental relationship between the adjustment of damping coefficients and the vehicle ride and handling dynamic characteristics, and the tendency in adjustment of damping coefficient with different vehicle parameters.口試委員會審定書.......................................................................... i 誌 謝............................................................................................ ii 中文摘要........................................................................................ iii 英文摘要.........................................................................................iv 圖目錄......................................................................................... viii 表目錄............................................................................................xi 符號說明....................................................................................... xii 第一章 緒論....................................................................................1 1-1 引言..................................................................................1 1-2 研究動機與目的...............................................................3 1-3 研究方法與步驟...............................................................4 第二章 理論基礎............................................................................5 2-1 七自由度全車系統之模型................................................6 2-2 七自由度全車系統之運動方程式....................................8 2-3 系統之頻域方程式.........................................................13 第三章 路況輸入..........................................................................17 3-1 隨機路面輸入下系統之振動響應..................................18 3-1-1 隨機路面的頻域模擬..................................................18 3-1-2 隨機路面車輛系統的振動輸出..................................22 3-2 凸起路面的模擬.............................................................30 第四章 阻尼係數的調配對車輛動態特性之影響.......................33 4-1 阻尼的影響......................................................................34 4-1-1 頻域響應.....................................................................35 4-1-2 隨機路面.....................................................................37 4-1-3 凸起路面.....................................................................38 4-1-4 小結.............................................................................40 4-2 前後阻尼係數之調配.....................................................40 4-2-1 近似三自由度系統......................................................41 4-2-2 七自由度系統..............................................................47 4-2-3 小結.............................................................................61 4-3 左右阻尼係數之調配.....................................................62 4-4 單輪阻尼係數之調配.....................................................67 4-5 七段可調式阻尼器.........................................................71 第五章 車輛參數變化..................................................................77 5-1 彈性係數的計算.............................................................78 5-2 車輛重心的改變.............................................................80 5-2-1 車輛重心的移動..........................................................80 5-2-2 車輛載重的影響..........................................................82 5-3 簧下質量的變化.............................................................84 第六章 結論..................................................................................87 6-1 結論................................................................................87 6-2 未來研究方向.................................................................90 參考文獻........................................................................................91 附錄A 程式碼及使用說明...........................................................93987349 bytesapplication/pdfen-US阻尼係數車輛動態特性七自由度全車模型隨機路面凸起路面damping coefficientvehicle dynamic characteristics7-DOF vehicle modelrandom vibrationbumperthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/61518/1/ntu-96-R93522632-1.pdf