Study on directivity pattern of acoustic field radiated by rectangular plate with flexural vibration under free boundary conditions
ZHANG Yong, HE Xi-ping*, LI Wei, XU Long
(Applied Acoustics Institute, Shaanxi Normal University, Xi′an 710062, Shaanxi, China)
Abstract:
The surface vibration displacement of the sound source is obtained by the finite element method. The directivity pattern of a rectangular thin plate with flexural vibration under the free boundary condition is derived through dispersing the Rayleigh′s integral formula. Based on the above, the directivity patterns in both 2-dimension and 3-dimension are calculated. The results showed that when the vibrational order of the rectangular thin plate in flexural is increased, the distribution of the directivity pattern becomes more acute, but there is no directivity pattern in the axis.
KeyWords:
directivity pattern; flexural vibration; radiated acoustic field; finite element method
