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| 題 名 | 聲強法在離心扇噪音診斷之研究=On Sound Intensity Technique Applied to Noise Diagnosis of Centrifugal Fan |
|---|---|
| 作 者 | 林顯群; 李炫秉; | 書刊名 | 中華民國音響學刊 |
| 卷 期 | 4:1 1996.12[民85.12] |
| 頁 次 | 頁80-100 |
| 分類號 | 446.72 |
| 關鍵詞 | 後傾式離心扇; 噪音; 聲強法; 頻譜; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本文針對後傾式離心扇的噪音特性及衰減方式進行研究,首先依照ISO-3745標準 完成半無響室之規劃與建立;並根據 ISO-9614-1 標準進行三維聲強量測,以網格包圍離心 扇外殼及馬達作逐點量測,研究其噪音分佈及傳遞路徑。實驗獲知噪音由離心扇外殼的開口 部位(進、出風口)輻射而出,應用此發現於 AMCA 風機測試系統的高噪音輔助離心扇;其 消音箱設計著重於進、出風口噪音傳遞之衰減,包含多層隔音箱、吸音導管型消音器、干涉 型消音器, 使屬於窄頻帶噪音之第二簡諧頻率( f �� =550Hz )衰減了 34dB, 基頻( f �� =275Hz )衰減了 20dB;而廣頻帶噪音也降低了 10 到 20dB。此外,本研究亦進行離心 扇之幾何參數分析, 變動參數包括切風片( Cut-off )間隙、葉片數、加裝葉輪中心體、 入口圓錐體之間隙、入口圓錐體之錐角,評估其對噪音量及頻譜特性之影響。結果顯示,加 大切風片間隙使噪音衰減極明顯,是離心扇噪音控制的有效方法,但流量卻也隨之降低;而 葉輪上加裝中心體,可使風機效率提高 3%,唯噪音並無明顯改善; 其餘幾何參數對噪音並 無明顯變化,在離心扇噪音防治之應用上頗為有限。 |
| 英文摘要 | This study is to investigate the sound characteristics and noise attenuation methods of the backward inclined centrifugal fan. To ensure a reliable experiment, a semi-anechoic chamber is set up according to ISO-3745, and all the sound intensity (S.I.) measurements are carried out by the procedure described in ISO-9614-1. At first, with the aid of discrete-point grid enclosing the fan and driving motor, the 3-D S.I. measurement is executed to identify the noise distribution and propagation path of the whole system. The results show that the noise contribution of motor is not significant and can be ignored. Also, most of the noise radiate through the openings of fan housing, such as inlet and outlet, to the surrounding. Based on this conclusion, a chamber, including the multilayer insulator, absorptive lined ducts, and interference attenuator is designed to reduce the noise issuing from the auxiliary fan of the AMCA chamber. It is found that a 34 dB improvement is obtained for the blade passing frequency, and the broad band frequency is also reduced by 10 to 20 dB. In addition, the noise variations of five geometric parameters of the fan are studied. These parameters considered are: (1) cut-off clearance, (2) number of blades, (3) attachment of center body, (4) radius clearance between inlet cone and impeller, and (5) the conical angle of inlet cone. Next, the computation of sound power and the analysis of noise spectrum are carried out. In summary, increasing the cut-off clearance is the dominant method to diminish the narrow band frequency. Besides, the attachment of center body enhances the total efficiency by 3%, while no obvious improvement on noise level is observed. Moreover, an extensive discussion for the influence on other parameters is provided. |
本系統中英文摘要資訊取自各篇刊載內容。