The effect on radiated directivity pattern of the stepped circular plateby the deviation of nodal circular
LAN Zheng-kang HE Xi-ping MA Huan-pei Abulizi•Abulaiti
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Institute of Applied Acoustics,Shaanxi Normal University, Xi'an 710062,China
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History+
Received
Revised
Published
2012-04-01
2012-06-27
2013-06-25
Issue Date
2013-06-25
Abstract
In practical applications, the location of the nodal circular and the pre-designed stepped in the stepped circular plate can not be realized coincidence for some reasons, that is to say, there are more or less deviations between the nodal circular location and the stepped location. In this work, taking a central convex stepped circular plate for example, the stepped circular plate is considered to be divided into three parts by the location of the nodal circular and the stepped, and then, a method that analytical calculate the three-part displacement distribution is proposed, and it is validated by finite element method. On this basis, the expression of radiated acoustic pressure is derived by the principle of superposition in the acoustic field, and the effect on the directivity pattern is calculated due to the deviation of the nodal circular location from the stepped one. The results showed that it will lead to the main lobe of the directivity pattern become wider by the deviation of the nodal circular location from the stepped location, the main lobe of directivity pattern will bifurcate when the nodal circular is larger than the stepped location to a certain value, this makes the radiated energy of the sound field is relatively dispersed.
LAN Zheng-kang HE Xi-ping MA Huan-pei Abulizi&#;Abulaiti.
The effect on radiated directivity pattern of the stepped circular plateby the deviation of nodal circular[J]. Journal of Vibration and Shock, 2013, 32(12): 105-109
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