Comparative Experimental Research on Radiated Noise Characteristics of Straddle Monorail Trains and Metro Trains Passing through Elevated Tracks

Abstract

[Objective] Radiated noise from urban rail transit has a significant environmental impact. Current research on the radiated noise of metro trains cannot directly guide the external noise control for straddle monorail trains. Therefore, it is necessary to further study the radiated noise characteristics of straddle monorail trains. [Method] Chongqing Rail Transit Line 1 is taken as the experimental subject for metro train radiated noise, while Chongqing Rail Transit Line 3 is selected for straddle monorail train radiated noise. The study adopts experimental methods to investigate the SPL (sound pressure level) of radiated noise during the operation of staddle monorail trains and metro trains. Measurement points are selected at distances of 7.5 m, 10 m, and 20 m from the center of the track beam, and a comparative analysis is conducted on the SPL at these points under different operating conditions. [Result & Conclusion] The average maximum radiated noise SPL of straddle monorail trains on straight track sections is overall higher than that on curved track sections. It gradually decreases as the distance between measurement points and the center of the track beam increases. Under both straight and curved track conditions, the average maximum radiated noise SPL of straddle monorail trains is 4 to 10 dB(A), lower than that of metro trains.

Keywords

• straddle monorail
• metro
• radiated noise