Bullet train converter noise reduction design method based on reactive noise elimination

Abstract

The invention discloses a bullet train converter noise reduction design method based on reactive noise elimination. The method is characterized by comprising steps: 1) obtaining the noise frequency and the noise value of a converter, 2) determining the maximum reactive noise elimination frequency, 3) determining the length of an expansion chamber of the target reactive silencer according to the maximum reactive noise elimination frequency, and determining the expansion ratio of the target reactive silencer according to the noise elimination amount, and 4) determining the target reactive silencer according to the expansion ratio of the target reactive silencer and the length of the expansion chamber, and installing the target reactive silencer in the air duct of the converter. The method can effectively reduce the low and medium frequency noise generated by a fan, and realizes the active noise reduction of the converter.

Description

technical field [0001] The invention relates to a noise reduction design method for a motor vehicle converter based on resistance noise reduction, and belongs to the field of rail transit. Background technique [0002] The existing converters for rail transit vehicles are usually composed of electrical components such as converters, control boxes and transformers. However, due to the heavy weight of the transformer, and the alternating magnetostrictive force generated during the operation of the transformer will be transmitted to the converter cabinet, excessive vibration will seriously affect the performance of electrical components such as the converter and the control box. Fatigue life and structural strength of the converter cabinet. [0003] At present, the fixing method of the transformer in the converter cabinet is relatively simple. It is directly fixed on the converter cabinet by bolts, or a vibration damping pad is installed between the transformer and the convert...

AI Technical Summary

Problems solved by technology

Studies have shown that when components such as the motor car converter fan work, they will generate relatively large low-frequency noise (between 100 and 300 Hz), resulting in excessive radiation noise from the converter suspended at the bottom of the car body, which exceeds the noise control requirements

At the same time, the low-frequency noise generated by converter fans and other equipment is usually difficult to eliminate substantially with sound-absorbing sponges

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