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題名 | 圓片聲波繞射場實驗研究=Experimental Study on the Diffracted Acoustic Fields about a Circular Disk |
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作者 | 黃清哲; 吳漢傑; 賴文傑; 陳潮億; Huang, Ching-jer; Wu, John; Lai, Wen-jie; Chen, Chao-yi; |
期刊 | 中華民國音響學刊 |
出版日期 | 19970600 |
卷期 | 4:2 1997.06[民86.06] |
頁次 | 頁14-29 |
分類號 | 448.5 |
語文 | chi |
關鍵詞 | 圓片; 聲波; 繞射場; |
中文摘要 | 本研究主要是在實驗水槽中量測聲源在圓片附近的繞射場,不同聲源頻率、圓片 表面材料音質及圓片厚度對繞射場的影響在文中作了有系統的比較。實驗結果經與解析比較 以確定其準確度。實驗結果顯示,聲波在不�袗�片附近的繞射場與全硬圓片繞射場的特性相 當接近, 亦即在圓片對著聲源的區域, 由於入射聲波與反射聲波的交互作用,會有干涉( interference )的現象,而在圓片背後的陰影區,靠近圓片下方中心時, 會出現聲壓之極 大值。當圓片表面貼上保麗龍片時,則圓片繞射場的特性接近全軟圓片的繞射場。此外;圓 片厚度對繞射場的特性基本上影響不大,但聲壓的分佈則會改變。 |
英文摘要 | The purpose of the present study is to measure the diffracted acoustic field about a circular disk due to a point source in the water tank. Effect of different parameters on the acoustic field have been studied systematically. These parameters include the wavenumber and the location of the acoustic source, the thickness and the acoustic impedance of the circular disk. The experimental results have been compared with analytical results to verify their accuracy. Experimental results show that in the illuminated side of the steel-disk, due to the superposition of the incoming and the reflected sound waves, the interference phenomena can be easily observed. On the shadow region along the axis parallel to the surface of the disk, there are local maxima and minima of sound pressure. These phenomena become more apparent as the wavenumber increases. When both the upper and the lower surfaces of the steel-disk are covered by a polylon disk, the diffracted acoustic field behaves like that about a perfectly soft disk. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。