擋板配置對矩形消音器性能影響之實驗研究

EXPERIMENTAL STUDY ON THE PERFORMANCE OF RECTANGULAR MUFFLERS WITH DIFFERENT PLACEMENT OF BAFFLES

顏智洋(Chih-Yang Yen)

指導教授 ： 張英俊 ； 邱銘杰

大同大學/工程學院/機械工程學系所/碩士(2008年)

摘要

本文旨在探討垂直擋板間隙和消音材片數與角度對於非傳統矩形消音器消音性能之影響。藉由改變垂直擋板間隙、消音材片數、消音材角度等參數組成之各式消音器內置，作消音性能實驗，並將實驗數據繪成噪音減低圖，用以比較消音器於不同內置型式下之噪音減低量。
首先以消音材片數與前擋板間距離為變異參數，發現消音材片數增加與擋板間距增加對於消音器消音性能有顯著提升，而擋板間距越窄對於消音性能並無顯著幫助；此外，針對不同消音材角度與消音器前擋板間距不同進行比較，經由實驗比較後可以發現，擋板間距縮小可使峰值在250Hz時提升，而消音材角度不同對於800Hz後才開始有顯著影響；然而，在125Hz以下，加入擋板與消音材反而皆會使消音器之消音性能變差。除此之外，消音材性質不同對於消音器之影響於800Hz後開始明顯提升，於高頻之影響則十分顯著。

關鍵字：消音器、噪音減低、擋板、消音材、角度

關鍵字

角度 ； 消音材 ； 消音器 ； 噪音減低 ； 擋板

並列摘要

This study is to investigate the performance of rectangular mufflers with respect to the design parameters ― the clearance of an internal baffle, the amount of the absorbing material, and the angle of absorbing slices. Such different parameters will form various layouts of the muffler so as to compare the individual acoustical performance of noise reduction by using the experimental data results.
First of all, the clearance of the internal baffle and the amount of the absorbing material were changed. It is obvious that the muffler has significant improvement in noise reduction performance when using a larger clearance of internal baffle and absorbing material, On the contrary, the acoustical performance will be worse when a narrow clearance of the internal baffle is used. Subsequently, the influence of various absorbing slice’s angles and internal baffle’s length-clearance has been investigated by experimental work. Result reveals that the less of the clearance of the internal baffle will enable the noise reduction at the peak frequency which is around 250Hz; moreover, the influence of different angles of absorbing slices will be remarkable when the frequency is beyond 800Hz; however, either the baffle or the absorbing material is invalid for the acoustical performance when the frequency is under 125Hz. In addition, different kinds of absorbing materials will have influence at the frequency of 800Hz above and will be remarkable at a higher frequency.

Keyword: muffler、noise reduction、 baffle、absorbing materials、angle

並列關鍵字

absorbing materials ； baffle ； angle ； muffler ； noise reduction

參考文獻

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