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Feed-forward active noise barrier

A passive sound barrier and sound barrier technology, applied in the direction of sound-producing equipment, instruments, etc., can solve the problems of no relevant research on the application of active sound barrier, affecting the control effect, and limited control effect, etc., to achieve easy implementation, good control effect, high cost effect

Active Publication Date: 2011-09-14
NANJING UNIV
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Problems solved by technology

However, the feedback controller has two disadvantages: (1) the error microphone must be close to the secondary sound source to stabilize the system, so the control effect is limited; (2) there is a water bed effect, that is, noise attenuation in some frequency bands will inevitably lead to other Enhancement of frequency band noise, which also affects its control effect
Single-channel feed-forward controllers have been applied in simple sound fields such as pipeline active noise reduction and transformer active noise reduction, but there is no relevant research on the application in active sound barriers

Method used

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Embodiment Construction

[0018] The present invention is described in detail below by examples.

[0019] Such as figure 1 , figure 2 As shown, the feedforward active sound barrier includes a passive sound barrier 1 and a single-channel feedforward active control system array 2 , and the array is composed of multiple single-channel feedforward active control systems 3 . Each single-channel feedforward active control system 3 is composed of a reference microphone 6 , an error microphone 7 , a secondary sound source 8 and a single-channel controller 9 . In this embodiment, the reference microphone 6 and the error microphone 7 are electret microphones, and the secondary sound source 8 is a loudspeaker.

[0020] The single-channel feedforward active control system array 2 is installed on the top of the passive sound barrier 1. In this embodiment, at a height of h b A horizontal support 5 is installed on the top of the passive sound barrier body 4, and secondary sound sources 8 are evenly distributed an...

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Abstract

The invention discloses a feed-forward active noise barrier, which comprises a passive noise barrier and a single-channel feed-forward active control system array. Each single-channel feed-forward active control system forming the array comprises a reference microphone, an error microphone, a secondary sound source and a single-channel controller. The secondary sound sources are arranged on the top of the passive noise barrier. The reference microphones are positioned on one side of a noise source and close to the top of the barrier. The error microphone is positioned on one side of an observation point and close to the top of the barrier. The controller of each single-channel feed-forward active control system is used for controlling the output of the corresponding secondary sound source so as to minimize a square value of sound pressure amplitude at the position of the corresponding error microphone, and adopts a feed-forward single-channel adaptive control algorithm. Each single-channel control system is compact, has low cost and is easy to implement. The problems of high implementing difficulty and high cost when a multi-channel control system is used are solved. Compared with the conventional feedback active noise barrier, the feed-forward active noise barrier has high system stability and a good control effect and does not have a water bed effect due to the adoption of the feed-forward control systems.

Description

1. Technical field [0001] The invention relates to a noise barrier, in particular to an active sound barrier. 2. Background technology [0002] With economic development and social progress, the scale of road traffic and rail traffic is increasing day by day, and the problem of traffic noise is becoming more and more prominent. In order to eliminate traffic noise and protect people on both sides of the road and the track, the way of building noise barriers on both sides of the road and the track is usually adopted. Traditional sound barriers, that is, passive sound barriers, are constructed of sound-insulating materials. The principle is to block the direct sound of noise. Because low-frequency noise is easy to diffract from the top of the barrier, it has poor noise reduction effect in low-frequency bands. Active noise control technology eliminates noise through the principle of "muffling noise with sound". It has a good effect in low-frequency noise reduction, is easy to i...

Claims

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Application Information

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IPC IPC(8): G10K11/178G10K11/16
Inventor 邹海山卢晶陈锴吴海全陈家兴陶建成林志斌师瑞文董家富邱小军李宁荣吴训耿锡年陈卫松彭久高曾荣源
Owner NANJING UNIV
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