- 作者: 黃清哲; 陳潮億; 楊世安
- 作者服務機構: 國立成功大學水利及海洋工程研究所; 國立成功大學造船及船舶機械工程研究所
- 中文摘要: 本文主要是利用積分方程法探討全軟物體之聲波繞射場。計算實例中計算兩種不同幾何形狀的物體,分別為圓球(鈍形物體)及圓片(薄片物體)。應用數值方法求解對任意波數有效的積分方程所得圓球繞射場的結果與解析解一致,且不受積分方程中組合參數的影響。對於圓片的問題,由於當其厚度很小時,積分方程中的核函數會出現峰值,造成積分誤差,本文也提出了解決這個問題的方法。圓片繞射場的數值計算結果與解析解完全一致。本文也求出了上述兩種物體在使用不同積分方程時的特徵波數。在驗證數值模式的準確性之後,不同參數像聲源位置、波數等對繞射場的影響也作了有系統的研究“
- 英文摘要: The-integral equation method is applied to compute the diffraction of acoustic waves by perfectlysoft bodies,To demonstrate the procedure, two different kinds of body shapes are discussed, namely,a sphere (blunt body) and a circular disk (thin-shaped body).In the former case, an integral equationvalid for all wavenumbers is solved numerically. The numerical results are identical to analytical resultsand are independent of the values of the coupling constant. In the latter case, a new numerical techniqueis devised to perform integration involving peak values,which occur when the disk becomes very thin.In both examples, characteristic wavenumbers of different integral equations are given in detail over thestudied range of wavenumbers. The characteristics of diffracted sound from a point source about thesetwo bodies are discussed. Effects of different parameters on the diffracted sound field are studiedsystematically.
- 中文關鍵字: acoustic waves; diffraction; Integral equation
- 英文關鍵字: --