Active noise reduction system and method for trains

Abstract

The invention discloses an active noise reduction system and method for a train. The system includes a noise acquisition unit, a noise processing unit, a microphone, a loudspeaker and an MVB bus, wherein the microphone is installed in the body of the train and is used to acquire a noise signal from the body; the noise acquisition unit transmits the noise signal acquired by the microphone to the noise processing unit through the MVB bus; and the noise processing unit analyzes and processes the acquired noise signal, generates a cancellation sound wave signal of which the frequency and amplitudeare equal to that of the noise signal and the phase is opposite to that of the noise signal, and controls the loudspeaker installed in the body of the train to generate reverse sound waves to reduceor cancel the noises in the body. According to the scheme of the invention, the problem that the self weight and manufacturing cost of the body are increased due to the input of excessive sound insulation materials can be effectively avoided, and the noises inside the body of the train can be reduced through an active noise reduction mode.

Description

technical field [0001] The invention relates to the technical field of rail transit, in particular to an active noise reduction system and method applied to trains, which can realize active noise reduction of trains and effectively avoid excessive input of sound insulation materials. Background technique [0002] When the train is moving, the sound in the compartment plays a very important role in the impact on the comfort of passengers and the driver's driving experience. The main sound sources of trains can be divided into three main aspects: power system noise, mechanical noise sources and aerodynamic noise. Specific sources of sound sources include wheel-rail rolling noise, impact noise, friction noise, noise from equipment such as traction motors, fans and compressors, and aerodynamic noise caused by train heads, bogies, pantographs and other parts. A large amount of data shows that when the train is running at a speed of 300km / h, the main noise source of the train is ...

AI Technical Summary

Problems solved by technology

In order to meet the increasing noise control level requirements, more noise-reducing materials need to be installed in the car body, but the excessive use of sound-insulating materials on the train body not only reduces the internal noise of the car body, but also greatly improves the quality of the car body. own weight and manufacturing cost

At the same time, when the train is moving, although the sound-insulating and sound-absorbing noise-reducing materials used in the car body today have a good noise-reducing effect on high-frequency noise and can eliminate most of the high-frequency noise, they are not effective for wheel-rail vibration, aerodynamic noise and Low-frequency noise such as traction noise is still not well eliminated and processed, and these noises greatly affect the ride experience of passengers and drivers

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