Analysis of acoustic radiation mode in time domain

2009 ◽  
Vol 52 (8) ◽  
pp. 2384-2390 ◽  
Author(s):  
WeiGuo Wu
Keyword(s):  
Time Domain ◽  
Acoustic Radiation ◽  
Radiation Mode

Effect of Orientation Angle on Acoustic Radiation Mode Amplitudes of Laminated Composite Plates

2014 ◽  
Vol 621 ◽  
pp. 3-6
Author(s):  
Jin Wu Wu ◽  
Hai Peng Yuan
Keyword(s):  
Finite Element ◽  
Acoustic Radiation ◽  
Orientation Angle ◽  
Laminated Composite ◽  
Composite Plates ◽  
Element Model ◽  
Laminated Plate ◽  
Laminated Composite Plates ◽  
Radiation Mode ◽  
Radiation Amplitude

In this paper, the acoustic radiation mode’s amplitudes of laminated composite plates are studied. The layer wise finite element model is imposed to determine velocity distributions of laminated composite plates. Based on the acoustic radiation mode, the effects of the panel orientation angle on the first three orders acoustic radiation mode’s amplitude of the laminated composite plates are then discussed. A twelve-layer laminated plate was used as an example, and the numerical simulations results show that the effects of the panel orientation angle on the acoustic radiation amplitude of the laminated composite plates are significant.

Time-Dependent Calculation of Acoustic Radiation From Finite Wings Using BEM

2000 ◽  
Author(s):  
Trevor H. Wood ◽  
Sheryl M. Grace
Keyword(s):  
Boundary Element Method ◽  
Aspect Ratio ◽  
Time Domain ◽  
Acoustic Radiation ◽  
Domain Boundary ◽  
Time Dependent ◽  
Numerical Convergence ◽  
Convergence Method ◽  
Acoustic Responses ◽  
Coarse Grids

Abstract The calculation of acoustic radiation from finite wings using a 3D, time-domain Boundary Element Method (BEM) was investigated. Numerical convergence was studied and solutions obtained using an extrapolated convergence method were used to compare to 2D analytical solutions. Frequency-domain lift solutions were found to be accurate to less than 5% using relatively coarse grids (Δx ∼ 0.1) for reduced frequencies above 0.1 and less than approximately 3. The acoustic responses for high aspect ratio wings were found to agree well qualitatively with the 2D results. As an illustration of the capabilities of the method, a full-span, flapped wing configuration undergoing oscillatory motion was considered with a preliminary quantification of the aeroacoustic influence of the flap.

Acoustic radiation mode shapes for control of plates and shells

2013 ◽  
Vol 133 (5) ◽  
pp. 3385-3385 ◽  
Author(s):  
William R. Johnson ◽  
Pegah Aslani ◽  
Daniel R. Hendricks
Keyword(s):  
Acoustic Radiation ◽  
Mode Shapes ◽  
Radiation Mode ◽  
Plates And Shells
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