Analysis of Vehicle End Noise under Higher Speed Operating Conditions of a High-Speed Train Based on OTPA

Based on field test, the noise characteristics inside A high-speed train under higher speed conditions above 350 km/h were tested and analyzed. The distribution of noise sources inside the train, the contribution of interior panels, and the contributions of airborne and structural-borne sound to in-vehicle end noise were studied. The test results show that under higher speed conditions, the significant frequency band of interior noise is in the 1/3 octave band of the center frequency of 100 - 300 Hz and the main source of noise comes from the passenger compartment floor. The main source of noise inside the vehicle is the transmission of wheel rail vibration through the center pin, anti-yaw absorber, and air suspension to the vehicle body, which is then radiated by the vibration of the interior panels. Therefore, suppressing low-frequency structural vibration and sound transmission of the floor is an effective method to reduce noise inside the vehicle.