新型消音器結構設計與噪音量測實驗

New Design of an Industrial Silencer and Experiment on Noise Control

孫忠銓(Chung-Chyuan Sun) ； 楊大中(Ta-Chung Yang) ； Tung-Meng Chang ； 蔡昇憲(Sheng-Shian Tsai) ； 周世剛(Shih-Gang Jhou)

《中華民國振動與噪音工程學會論文集》 2011 (2011/06) Pp. 28-36

https://doi.org/10.30028/CSSVANNUAL.201106.0028

摘要

近來產業界作業環境對噪音之要求愈來愈嚴格，消音器常被用來做為降低機器噪音的手段。本文以40HP魯式鼓風機為例，利用消音器來改善噪音相關問題，探討消音器的消音性能，及消音器內部結構的設計方式。穿孔薄板消音器經由分析模擬可得知其具有中低頻率之良好消音特性，自行設計消音器(B)之結構設計使用穿孔薄板。由實驗結果得知使用自行設計消音器(A)時，鼓風機噪音由116dBA降至88dBA，而使用自行設計消音器(B)時，鼓風機噪音由116dBA降至78dBA，消音的效果顯著。從頻譜圖中可印證高頻率噪音以吸音或隔音可得良好的吸音效果。由於共振結構對於降低頻率噪音有較佳的效果，未來將針對噪音的中低頻率特性，以多種共振結構設計對進行消音器之設計改進。

關鍵字

消音器 ； 降低噪音 ； 聲學 ； 傳遞損失

並列摘要

Recently, the operating environments in industry are subjected to more and more stringent requirements on noise. Silencers are often used to reduce the noise emitted from the discharges of machines. In this paper, the performance the silencers on noise reduction were investigated and different designs on the internal structures of silencers were evaluated for a 40HP Roots blower.From simulation, the silencers with perforated structures have good performance on transmission loss to the noise of medium to low frequency ranges. The perforated tube was used in the design of silencer B. From the experiment conducted for the blower using silencer A, noise was reduced from 116dBA down to 88dBA, while noise was reduced from 116dBA down to 78dBA using silencer B. According to the spectrum, absorption and isolation have better effects on the reduction of high-frequency noise. As known, structural resonance has better effects on reducing low-frequency noise. Thus, structural designs of resonance for the silencers will be studied to reduce the noise of medium to low frequency ranges.

並列關鍵字

Silencer ； Noise Reduction ； Acoustics ； Transmission Loss