手持式吸塵器排氣噪音制抑之數值模擬與實驗研究

本研究主要針對手持式吸塵器在出風口嚴重之排氣噪音，究所量測之主噪音頻率725Hz使用四分之一波長共振器與赫歇爾－昆克管評估消音性能，為取得寬頻消音效果以因應馬達轉數變動造成主噪音頻率之飄移，並考慮模型3D列印體積之限制，將四分之一波長共振器以半圓球之樣式設計，以檢視作用截面積增大，對頻寬提升之影響。分別藉由三根到四根麥克風實驗測量，評估傳遞損失理論與實驗之差異，並修改管口造型以降低哨音效應，獲得更好的消音效果。在不減損操作性能下，原設備總噪音82dBA，於裝設四分之一波長共振器後降至76dBA，下降6dBA；而裝設赫歇爾－昆克管之消音效果則更為卓著，總噪音下降至74dBA，下降8dBA，且與原機體結構具有更佳之結合性。

關鍵字

噪音制抑；四分之一波長共振器；赫歇爾－昆克管；傳遞損失

並列摘要

This study deals with the serious exhaust noise problem of a portable vacuum cleaner by using a quarter-wavelength resonator and Herschel-Quincke tube. The primary noise frequency of 725Hz is targeted for evaluation of the noise suppression performance. To get broadband silencing effect in consideration of the motor speed fluctuation, which resulted in frequency drift of the primary noise, and to consider the volume limitation in 3D printing of the designed model, a hemisphere shape is used for the quarter-wavelength resonator to examine the effect of increasing the cross-sectional area on bandwidth broadening. The three and four microphones methods are used respectively to experimentally assess the transmission loss and to compare with that predicted by theory. The duct shape is modified to reduce the whistle sound effect for better silencing performance. Without compromising the operating performance in vacuum cleaning, the total noise, 82dBA, of the original equipment is reduced to 76dBA, reduction of 6dBA after installing the quarter-wavelength resonator; the noise suppression performance is even more remarkable using the Herschel-Quincke tube, with the total noise being brought down to 74dBA, a drop of 8dBA, and better integration with the original body structure is observed.

並列關鍵字

Noise Suppression ； Quarter Wave Resonator ； erschel-Quincke Tube ； Transmission Loss

國際替代計量

手持式吸塵器排氣噪音制抑之數值模擬與實驗研究

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