諾多研究指出軌道系統噪音與振動之間具有密切之關係。爰本研究採用數值分析方法，建立軌道與車輛耦合之理論模型，並應用高速鐵路車輛不同黏著係數及軌道參數，以車輛等速行駛於具不同軌道不整度之直線軌道線型與彎道軌道線型，來求得軌道車輛各構件之振動響應。使用振動劑量值與曝露噪音位準之轉換公式，探討軌道車輛構件在各種參數條件下之噪音增量，並以非線性回歸分析法，獲得振動加速度與噪音之評估公式。最後確定軌道振動加速度與噪音為對數之關係，並透過此評估公式，預測軌道車輛構件噪音增量。
本研究之數值模擬結果顯示，懸吊系統之設計可有效降低軌道車輛噪音量，而輪/軌接觸面之面積與形狀，對於軌道車輛噪音影響深遠；軌道不整度及黏著係數之提昇皆會導致噪音量之增加，且軌道不整度為造成輪軌滾動噪音主要原因。經由軌道車輛系統靈敏度分析後，可獲得一適當之軌道墊片垂向勁度設計範圍；採用適當之勁度設計，可達降低輪軌噪音之目標。

Many studies have been indicated that the noise and vibration are closely related for the railway system. The objective of this study is to investigate the rolling noise of a high-speed rail vehicle by developing a simulation model using the available vehicle parameters and track parameters. Numerical analysis method was adopted to develop a vehicle-track coupling theory model. To simulate the dynamic response of running railway vehicle, different running condition and adhesion coefficient, as well as measured rail irregularity were applied. The dynamic responses were converted to the noise level by using equation of vibration dose values (VDV) and sound exposure level (LAE). The non-linear regression analysis is applied to obtain a fitting equation between the vibration acceleration and noise. The fitting equation indicates that the vibration acceleration and noise have a logarithmic relationship. Therefore the rolling noise level can be predicted by this fitting equation.
The simulation results show that there are some factors such as the suspension system, the shape of contact area, rail irregularity and adhesion coefficient have significant impact on rolling noise. Among those factors, the rail irregularity has the major contribution to the railway vehicle rolling noise. The sensitivity of rail pad stiffness to the rolling noise is also conducted by this research. Through an appropriate design of suspension system, the rolling noise of rolling stock can be reduce to the anticipate level.

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