Abstract
Acoustic resonant vibration occurs in a cavity with a tube bundle when flow velocity reaches some value. The vibration mode is usually transverse to the flow direction and its prevention is easy. However, recently, parallel mode vibration sometimes occurs. The mechanism of vibration was discussed in our previous paper and it seems that the vibration is a kind of self-excited vibration induced by unsteady fluid dynamic force. The damping factor of a system plays a very important role in the vibration; thus the method for estimating the damping factor of acoustic vibration was discussed. The boundary element method is usually used for calculating acoustic vibration; however, it is not able to estimate the damping coefficient. The frequency response of pressure can be calculated by the boundary element method and was used for calculating the damping coefficient. In this paper we describe a method of estimation of damping coefficient and results of calculations based on the method.
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