Excessive interior noise in railway vehicles is a major cause of fatigue and discomfort for passengers. In particular, the between-cars sections of high-speed trains experience considerable interior noise due to the poor noise reduction performance of the bellows, which are primarily made of silicone rubber and thus have a lower density than that of other components, made of extruded aluminum. Therefore, the objective of this study was to improve the noise reduction performance of such bellows. First, the material properties of silicone rubber were analyzed. Based on the results, the noise transmission of a simple model was analyzed to determine approaches required to reduce the low-frequency interior noise of the between-cars sections. It was confirmed that the low-frequency noise could be reduced by incorporating a multilayered panel of silicone rubber. Therefore, multilayered structures were considered for incorporation in the interior space of the between-cars sections of an actual high-speed train. A curved driving simulation of the between-cars sections indicated that no interference occurs when applying the proposed approach. Furthermore, a comparative test regarding the noise reduction performance was conducted considering cases involving bellows with and without multiple layers. The results of the verification test demonstrated that the noise reduction performance when using the proposed approach was improved by 4 dB compared with that in the case involving the conventional bellows, and an improvement of 8 dB or more was observed for noise with a low-frequency of 100 Hz.

铁路车辆中过多的内部噪音是造成乘客疲劳和不适的主要原因。尤其是，由于波纹管的降噪性能差，因此高速列车的车厢间部分会遭受相当大的内部噪声，波纹管主要由硅橡胶制成，因此其密度低于挤压成型的其他组件的波纹管。铝。因此，本研究的目的是提高这种波纹管的降噪性能。首先，分析了硅橡胶的材料性能。根据结果​​，分析了一个简单模型的噪声传播，以确定减少车厢之间的低频内部噪声所需的方法。已经证实，通过结合硅橡胶的多层面板可以降低低频噪声。因此，考虑将多层结构结合到实际的高速列车的车厢间部分的内部空间中。车厢间部分的弯曲驾驶模拟表明，在采用建议的方法时不会发生干扰。此外，考虑到涉及具有多层和不多层的波纹管的情况，进行了关于降噪性能的对比测试。验证测试的结果表明，与使用传统波纹管的情况相比，使用该方法时的降噪性能提高了4 dB，对于低频噪声，观察到的降噪性能提高了8 dB以上100 Hz