When the speed of a railway vehicle increases, the level of noise inside the vehicle inevitably increases as well, which is a major cause of discomfort to passengers. The most effective method is to improve the overall noise reduction performance of a vehicle. In particular, the gangway of the railway vehicle is made of silicone rubber; therefore, its noise reduction performance is inferior to that of other components of the vehicle. Thus, it is essential to improve the interior noise performance of railway vehicles. This study aims to reduce the noise in the low-frequency region of a railway vehicle gangway. It examines the applicability of the multi-layered resonance type panel, which has not been previously applied to the bellows in railway vehicles. In particular, the transmission loss was improved by changing the structure without filling the bellows with sound-absorbing material. First, a theoretical review of the noise reduction performance of a perforated multilayer structure was performed. Based on this, the major design parameters of the perforated multilayer structure that are effective in reducing noise in the low-frequency region of the bellows were derived. Through this, it was confirmed that in the multilayered structure, the hole diameter of 1 mm was effective in increasing the transmission loss in the low-frequency region, and the transmission loss was improved at 1% of the porosity. In addition, through a simple two-dimensional analysis model, it was confirmed that the transmission loss of the porous panel was improved at low frequencies of 100 to 400 Hz. Based on this result, a gangway with perforated multilayer structures was developed and tested. Through this verification test, it was confirmed that the noise performance of 9.2 dB was an improvement in the low frequency range of 100 Hz.

当铁路车辆的速度增加时，车辆内部的噪声水平也不可避免地增加，这是使乘客感到不适的主要原因。最有效的方法是提高车辆的整体降噪性能。特别是，铁路车辆的舷梯是由硅橡胶制成的。因此，其降噪性能不如车辆的其他部件。因此，必须改善铁路车辆的内部噪声性能。这项研究的目的是减少铁路车辆过道的低频区域的噪声。它检查了多层共振型面板的适用性，该面板先前尚未应用于铁路车辆的波纹管中。特别是，通过改变结构而不在波纹管中填充吸音材料来改善传输损失。首先，对多孔多层结构的降噪性能进行了理论综述。在此基础上，得出了可有效降低波纹管低频区域噪声的多孔多层结构的主要设计参数。由此可以确认，在多层结构中，孔径为1mm有效地增加了低频区域中的传输损耗，并且在孔隙率为1％时传输损耗得以改善。另外，通过简单的二维分析模型，证实了在100至400Hz的低频下多孔板的传输损耗得到改善。根据此结果，开发并测试了带有穿孔多层结构的舷梯。通过该验证测试，确认了9.2 dB的噪声性能在100 Hz的低频范围内得到了改善。