主動噪音控制於配電變壓器噪音抑制之應用

Application of Active Noise Control to Distribution Transformers Noise Attenuation

陳億謙(Yi-Chien Chen)

指導教授 ： 姚立德

國立臺北科技大學/機電學院/自動化科技研究所/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00192

摘要

一般而言，台灣電力公司配電室內往往有數台變壓器，因此變壓器運作時所產生之噪音，其噪音音量通常達60dB左右，目前已有不少住戶向台灣電力公司提出噪音擾人的問題。由於變壓器所產生之聲響為低頻率噪音，因此使用一般被動式消音較難有顯著的效果，為了有效改善變壓器所產生之噪音，所以選擇使用主動式消音(Active Noise Cancellation, ANC)。
本研究使用STC VC32之DSP整合系統作為運算控制器，搭配麥克風、揚聲器、擴大器等設備，構成一組ANC系統，針對聲音可能傳遞的路徑做出模擬實驗，以訊號產生器產生120Hz、240Hz、360Hz等不同頻率之訊號以及在配電室內錄製的變壓器噪音，傳於模擬對象內的揚聲器，模擬變壓器的噪音做為實驗對象，以消音喇叭周圍所產生之靜音區作為概念，降低變壓器噪音的影響。根據實驗結果得知，此實驗方式對於單一頻率的噪音以及錄製的變壓器聲音，都能有消音效果。

關鍵字

主動式噪音控制 ； FXLMS演算法 ； 數位訊號處理

並列摘要

An active measure of Active Noise Cancellation (ANC) in the reduction of acoustic noise generated by transformer used in Taiwan Power Company is proposed in this paper. As most of the common Electricity Distribution Facilities have placed lots of transformers, the acoustic noise can be achieved 60dB. People living around Taiwan Power Company are annoyed, complaining the living quality is seriously affected. The conventional passive measure of sound absorbers cannot have significant effect in reduction of low frequency of transformer noise. In order to improve and reduce acoustic noise, an active means of ANC is proposed to control transformer noise.
The proposed ANC system is cooperated with STC VC32 conformity system as the controller and is coordinated with microphones, loudspeakers and amplifiers. In the simulation, different frequency singles of 120Hz, 240Hz and 360Hz are generated and the noise that recorded from the transformer in Electricity Distribution Facilities are both transferred to the loudspeaker to simulate the transformer noise. The noiseless area around the attenuate loudspeaker is taken as a concept to reduce the acoustic noise. Experimental results show that there is a significant reduction in narrowband frequency noise due to the proposed ANC system.

並列關鍵字

active noise control ； FXLMS algorithm ； digital signal process

參考文獻

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