Research on Interior Noise Distribution Characteristics of Metro in Different Vehicles

With the continuous development of urban rail transit, people have higher and higher requirements for comfort during the ride, and the noise level and distribution characteristics are important factors affecting comfort. In this paper, the field test is used to study the noise distribution characteristics in a trailer with a driver's cab, a motor vehicle with pantograph and a motor vehicle without pantograph. The test is carried out at four speeds of 0 km/h, 20 km/h, 40 km/h and 60 km/h, and the A-weighted sound pressure level is used. Through the analysis of the A-weighted equivalent sound pressure level and frequency domain, the distribution law of noise in the metro vehicle can be obtained. The results show that when the speed is from 0 km/h, for every 20 km/h increases, the interior noise of increases by 11.6 dB (A), 1.7 dB (A) and 1.6 dB (A) respectively (taking the measurement point 8 as an example). Each measurement point produces the obvious noise in the low frequency range of 25-50 Hz, and the peak size is between 78.5 dB and 84.5 dB. Interior noise of Tc, Mp, M has different frequency characteristics.