Method for predicting denoising effect of active noise control system

An active noise control and noise reduction technology, applied in the direction of sound-emitting devices and instruments, can solve the problems of lack of test and simulation basis, and achieve the effect of resolving conflicting relationships

Active Publication Date: 2014-01-08
TONGJI UNIV
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Problems solved by technology

At present, the hardware layout of the active noise control system is mainly based on experience,...

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  • Method for predicting denoising effect of active noise control system
  • Method for predicting denoising effect of active noise control system
  • Method for predicting denoising effect of active noise control system

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] A method for predicting the noise reduction effect of an active noise control system, comprising the following steps:

[0023] (1) In the LMS Virtual.Lab software, establish the acoustic-solid coupling model of the vehicle body structure and the interior cavity, such as figure 1 shown;

[0024] (2) Set the hardware layout scheme of the active noise control system, arrange seven microphones 1 and three speakers 2 in the acoustic-solid coupling model, the microphones 1 are represented as field points at corresponding positions, and the speakers 2 Respectively expressed as the velocity boundary conditions of the boundary grid corresponding to the position;

[0025] (3) Obtain engine power incentives, and figure 1 The engine force excitation is applied at the positions A and B, and the steady-state responses of the field points correspo...

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Abstract

The invention relates to a method for predicting the denoising effect of an active noise control system. The method comprises the steps that acoustic-structure coupling models of a vehicle body structure and a vehicle inner cavity are built; M microphones and K loudspeakers are arranged; primary signal vectors d corresponding to the M microphones are acquired; a transfer function matrix H is acquired; the weighted value lambda i of each microphone is set to constitute a diagonal matrix lambda; the steady-state output X of the loudspeakers is solved; distribution situations of sound fields in a vehicle are calculated under the simultaneous action of engine force stimulation and loudspeaker stimulation; the distribution situations of the sound fields in the vehicle are observed by adjusting the number and the positions of the loudspeakers and the number and the positions of the microphones to acquire the denoising effect of the active noise control system in different hardware arrangement schemes. When the method is compared with the prior art, because the denoising effect of the system in different hardware arrangement schemes can be compared to evaluate hardware arrangement of the system and optimize the hardware arrangement schemes, and design and development of the active noise control system are facilitated.

Description

technical field [0001] The invention relates to a noise reduction effect prediction method, in particular to a finite element-based method for predicting the noise reduction steady-state effect of an active noise control system. Background technique [0002] Active noise control is a new technology. Its basic principle is to use a loudspeaker to emit a sound wave that is opposite in phase to the noise sound wave, so that the two are superimposed, so as to achieve the purpose of "muffling the sound with sound". Traditional interior acoustic packaging is effective in solving high-frequency noise, but not in low-frequency noise. Not only that, but traditional acoustic packaging is expensive and places additional load on the vehicle, affecting vehicle dynamics and economy. The active noise control technology can use the audio system for in-car entertainment, matching the corresponding microphone and controller, to achieve the purpose of low-frequency noise reduction, and the c...

Claims

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Application Information

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IPC IPC(8): G10K11/16
Inventor 张立军张频捷孟德建
Owner TONGJI UNIV
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