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題 名 | 內部聲源法計算聲音輻射全像之問題 |
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作 者 | 錢建中; 涂季平; | 書刊名 | 力學 |
卷 期 | 11:2 1995.06[民84.06] |
頁 次 | 頁133-146 |
分類號 | 334.5 |
關鍵詞 | 內部聲源法; 聲音輻射; 聲音全像法; Internal source method; Radiation; Acoustical holographics; |
語 文 | 中文(Chinese) |
中文摘要 | 內部聲源法乃是1993年由Stepanishen等人發展出來之理論,此方法是使用一虛擬 的表面代替真實之物體表面,使內部聲源法可以有效率地計算任意形狀物體之輻射聲場,但 在 Stepanishen 等人所發表之文章中只推導由速度求算聲源強度, 故在本文中吾人將該法 加以修改,由虛擬表面之壓力求算聲源強度進而應用於聲音全像之方法。經過修改之內部聲 源法更能適用於實際量測上。此方法並與二維圓柱體和三維球體輻射問題之正解加以比較, 結論可知內部聲源法能更有效率地利用已知之速度或壓力來預測其任意點聲場上壓力與速度 。 本文中亦定性地比較邊界元素法, 例如荷姆霍茲積分方程法( Helmholtz Integral Equation Formulation )與內部聲源法之差異,以供研究參考。 |
英文摘要 | Internal Source Method (ISM) (1993) developed earlier by Stepanishen et al. is used for radiation and scattering acoustic signal from an arbitrary-shaped body. The idea is to determine the source strength of a source line by measuring or giving particle normal velocity on artificial surface. In the present study, a modified ISM is developed by measuring acoustic pressure on the artificial surface instead of measuring the particle normal velocity. This modified ISM version can be suitable for application of acoustic holography. In addition, several examples in 2-D and 3-D are demonstrated to show that the modified ISM gives very good results for acoustic holography for radiation from an arbitrary-shaped body. |
本系統中英文摘要資訊取自各篇刊載內容。