| Summary: | 碩士 === 國立成功大學 === 造船工程學系 === 86 === 1993年Stepanishen等人發展出內部聲源法(Internal Source Method)描
述輻射及散射聲場,之後錢建中於1994年進一步根據聲源法的架構發展出
內部並列聲源法(Internal Parallel Source Method),蘇豋桂於1996年發
展出近似聲源法(Similar Source Method),使得聲源法描述輻射及散射聲
場更為完善.本文將根據近似聲源法的理論架構,進一步修改其理論模型使
其能完善的描述任意空間內部聲場遭遇不同邊界條件時之聲場分佈.文中
分別處理了內部聲場遭遇單一質點速度邊界條件,壓力邊界條件, 或速度
及壓力混合之邊界條件,及內部聲場存在一 已知聲源強度之真實聲源的問
題.最後,吾人亦測試了複雜幾何邊界形狀對於本文發展之計算模型的影
響.數值計算結果顯示本文利用近似聲源法發展於內部聲場的計算模型仍
有著相當良好之準確性及實用性.
In the earlier studies, one has successfully developed three
different source methods(SSM, Similar Source Method; IPSM,
Internal Paraller Source Method; ISM,Internal Source Method)to
estimate radiation and scattering sound field. All thesemethods
are estimations of exterior sound field. In the present study,
SimilarSource Method is modified to estimate an interior sound
field. The modificationis to move the imaginary sources outside
the boundary surface. In addition, the alternative boundary
conditions are considered by introducing the suitable
leastsquare error functions. Finally, several interior sound
fields with alternativeboundary conditions are evaluated and the
results are in agreement with those ofboundary integral method.
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