Non-centralized virtual sound barrier used for transformer noise reduction

A centralized, virtual sound technology, applied in transformer/inductor noise damping, instruments, sound-generating devices, etc., to achieve the effects of simple wiring, small amount of system calculation, and low system complexity

Active Publication Date: 2016-12-21
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Considering the actual size of the power transformer, even if it is located in the room and only needs to implement a virtual sound barrier at the opening of the room, it often requires hundreds of channels. If a centralized system is used, it is difficult to implement it due to complexity and cost constraints

Method used

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  • Non-centralized virtual sound barrier used for transformer noise reduction
  • Non-centralized virtual sound barrier used for transformer noise reduction
  • Non-centralized virtual sound barrier used for transformer noise reduction

Examples

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Embodiment Construction

[0029] like figure 2 As shown, two transformers are placed in two isolated rooms in a substation, and a non-centralized virtual sound barrier is implemented at the opening of transformer A, while the opening of transformer B is left untreated. The field points for evaluating the noise reduction effect of the non-centralized virtual sound barrier are set within 5.00m directly in front of the transformer opening, and the height is 1.20m, a total of 55 points. like image 3 As shown, the size of the front opening of transformer A is 8.30m(W)×6.20m(H). In order to realize the noise peaks around 100Hz and 200Hz, the control sound source in the decentralized virtual sound barrier is placed near the opening surface.

[0030] Set the upper limit of the frequency to be controlled to 200Hz, take the speed of sound in the air as 340m / s, and ensure that the interval between adjacent control sound sources is not greater than 0.85m. According to the width of the opening of 8.30m and the...

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Abstract

The invention discloses a non-centralized virtual sound barrier used for transformer noise reduction. The system is mounted near an open face of a room, is composed of a control sound source, an error microphone, a reference sensor, a plurality of single-channel active controllers and a peripheral circuit, can be used for controlling the noise with the sound source radiating outwards from the opening in the room, and is also beneficial for the natural ventilation and daylighting. Compared with the traditional centralized virtual sound barrier, the non-centralized virtual sound barrier used for transformer noise reduction has the advantages that the channels in the system operate independently, the systematic complexity is low, the wiring is simple, and the multichannel extension is facilitated.

Description

1. Technical field [0001] The invention relates to a non-centralized virtual sound barrier for transformer noise reduction. A control sound source is arranged near the opening surface of a room, and an error microphone is correspondingly arranged directly in front of the control sound source to reduce the transformer noise radiated outward through the opening. And it does not affect the natural ventilation and lighting of the opening. Since each channel operates independently, the control signal fed to each control sound source only depends on its corresponding error sensor. The system has a small amount of calculation and is convenient for multi-channel expansion. 2. Background technology [0002] The virtual sound barrier is an active noise control system, which usually consists of an error microphone array, a control sound source array, an active controller and peripheral circuits. A virtual sound barrier is placed on the noise propagation path, and the control signal fed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178H01F27/33
Inventor 陶建成王淑萍薛金佩邱小军
Owner NANJING UNIV
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