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Yang Ruiliangn
Wang Hongzhen
State Key Laboratory of Vibration,
Shock & Noise,
Shanghai Jiaotong University,
Shanghai 200030, China
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Adaptive ellipsoidal acoustic
infinite element
Abstract:
It is shown that the basis of the ellipsoidal acoustic infinite element Burnett method, the multipole expansion, cannot represent real ellipsoidal acoustic field exactly. To solve the problem, a weight of angular direction is added to the multipole expansion. The comparison of the modified method and the prime method shows that the modified method can describe and solve the ellipsoidal acoustic field more accurately than ever. A dilating sphere is used to test the new method further. Unlike other infinite element methods, varied ratio of the ellipsoidal artificial boundary instead of sphere is used. The pressure value of the artificial boundary is utilized as the initial value of the new method. Then the radiating phenomena of the ellipsoidal acoustic field can be researched using the new method. These examples show the feasibility of the adaptive method.
Key words: Burnett method Multipole expansion Infinite element |