Localization of Increased Noise at Operating Speed of a Passenger Wagon

Abstract

Noise generated by railway wagons in operation is produced by large numbers of noise sources. Although the railway transport is considered to be environmental friendly, especially in production of CO2 emissions, noise is one of problems that should be solved to keep the railway transport competitive and sustainable in future. In the EU, there is a strong permanent legislation pressure on interior and exterior noise reduction in railway transport. In the last years in Slovakia, besides modernization of existing passenger wagons fleet as a cheaper option of transport quality improvement, quite a number of coaches have been newly manufactured, too. The new design is usually aimed at increased speed, higher travel comfort, in which reduction of noise levels is expected. However, not always the new designs meet all expectations. Noise generation and propagation is a complex system and should be treated such from the beginning. There are possibilities to simulate the structural natural frequencies to predict vibrations and sound generated by these vibrations. However, the real picture about sound fields can be obtained only by practical measurements. Simulations of the wagon’s natural frequencies and mode shapes and measurements in real operation using a digital acoustic camera Soundcam have been done, which showed that for the calculated speeds the largest share of noise from the chassis was not radiated through the floor of the wagon, as was expected, but through the ceiling of the wagon. To improve the acoustic properties of the wagon at higher speed, it was proposed to use high-volume textile insulation in the ceiling of the wagon. The paper briefly presents modern research approaches in the search for ways to reduce internal noise in selected wagons used in normal operation on the Slovak railways.

Investigation of Noise Generated by Railway Freight Wagon Bogie Type Y25Ls(s)e-K and Proposals of Noise Reduction

“…The method was based on the simulation of natural (eigen) frequencies and noise measurements of selected components (bogie frame) and, consequently, proposal of noise mitigating measures (usage of recycled materials). The authors used similar method in research and proposal of noise reduction in passenger wagons-that time we focused on internal noise, but external noise was investigated, too [19].…”

The Effect of Polyisobutylene on Physical-Mechanical, Operational, Dielectric and Dynamic Properties of Rubber for Laying Rail Fasteners

“…N 5. P. 94102 ВВЕДЕНИЕ На сегодняшний день одной из важных проблем современного железнодорожного рельсового транспорта является понижение вибрации, которая передается в окружающую среду в виде механического шума при движении состава [1][2][3][4][5][6]. Шум от железнодорожного транспорта является угрозой для здоровья, а также причиной беспокойства и дискомфорта людей [7][8][9][10][11].…”

Effect of Polynorbornene on Physico-Mechanical, Dynamic, and Dielectric Properties of Vulcanizates Based on Isoprene, α-Methylstyrene-Butadiene, and Nitrile-Butadiene Rubbers for Rail Fasteners Pads

“…Railways create increased levels of vibration and noise during operation caused by the interaction of the rolling stock and the railway track [1][2][3][4][5][6][7]. The noise generated during the operation of railway transport has a negative impact on human health [8][9][10][11][12][13][14].…”