A method and device for active noise control of train traction system based on fractional variable step size

Abstract

The invention discloses an active noise control method and device for a train traction system based on a fractional variable step size. The method is to collect the noise signal in the noise area of ​​the train traction system as a reference signal; collect the residual noise signal in the noise control area as an error signal; analyze and process the reference signal and the error signal through a fractional order variable step size algorithm, And output the anti-noise signal with equal amplitude and phase opposite to the noise signal to the target area and superimpose the noise signal to cancel each other out. The invention provides a very effective method for the noise control of the train traction system, and improves the control accuracy and convergence speed of the algorithm by utilizing the good description of the transient state in the physical change process of the fractional calculus. The present invention is based on the active noise control method and device of the train traction system with fractional order and variable step length, and has obvious noise reduction effect on the noise of the train traction system below 1000 Hz.

Description

technical field [0001] The present invention relates to the technical field of vehicle noise control, and more specifically, to an active noise control method and device for a train traction system based on a fractional variable step size. Background technique [0002] With the rapid development of rail transit trains in the direction of high speed and heavy load, the noise problem has become increasingly prominent. Traction motor transmission system is the main power equipment of electric locomotive, its noise is a main source of train noise, it will seriously affect the comfort of the driver and passengers in the car. The noise sources of the traction drive system are mainly composed of three types: electromagnetic noise, mechanical noise, and aerodynamic noise. Electromagnetic noise is mainly the noise radiated by the stator vibrating. It is caused by the rotational force wave or pulse force wave generated by the electromagnetic force acting in the air gap of the stator...

AI Technical Summary

Problems solved by technology

But in general, the existing patented devices basically only achieve noise reduction in local or specific areas of the vehicle, and the effect achieved by the control method is narrow-band noise reduction, which mainly offsets the single-band noise that contributes a lot, but the stability poor

[0007] First of all, in the active noise control system (ANC), there are basically nonlinear problems, which affect the modeling accuracy

For designers, when the system is clear or simple, mathematical tools are generally used to establish accurate mathematical models, but when faced with complex or unknown systems with little information, general mathematical tools are difficult to establish accurate models

[0008] Secondly, the control accuracy of the current active noise control technology is insufficient, and the effect achieved is almost narrow-band noise reduction, mainly for targeted offsetting of single-band pure tones with relatively large contributions, and it is difficult to meet the requirements of broadband , and the system stability cannot be guaranteed

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