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VIBROACOUSTIC ANALYSIS OF A FLUID-LOADED CYLINDRICAL SHELL EXCITED BY A ROTATING LOAD

✍ Scribed by C.J WU; H.L CHEN; X.Q HUANG

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
200 KB
Volume
225
Category
Article
ISSN
0022-460X

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✦ Synopsis

A modal analysis study is presented to evaluate the vibroacoustic behaviour of a cylindrical thin elastic shell of "nite length, extended by two semi-in"nite perfectly re#ecting cylinders. The shell is immersed in a stationary and non-viscous #uid extending up to in"nity, and excited by a constant point load travelling continuously along the circumferential direction at a rotating speed . An expression of modal displacement amplitude of the submerged shell is given, which shows that the shell is exclusively excited only when the circumferential mode order n equals the harmonic order N of the rotating load. For this rotating excitation, the vibration and radiation critical speeds are identi"ed. Extensive numerical results are also presented to illustrate the comparison of vibration and sound radiation ability in two di!erent #uids, which show that the behaviour of the shell in water is very di!erent from that of the one in air.

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