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Experimental study on loss factor for corrugated plates by bandwidth method

Kumar Mandal, Nirmala and Abd. Rahman, Roslan and Leong, Mohd Salman (2004) Experimental study on loss factor for corrugated plates by bandwidth method. Ocean Engineering, 31 (10). pp. 1313-1323. ISSN 0029-8018

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Official URL: http://dx.doi.org/10.1016/j.oceaneng.2003.08.003


The material loss factor for technically orthotropic plates was measured by half-power bandwidth method. Rectangular and trapezoidal corrugated plates of steel were considered. A simple isotropic steel plate was also considered for comparison of the results. The concept of single degree of freedom system was adopted. The tests were undertaken at very low frequency range (0-100) Hz. The plate models were suspended freely with two wires to minimize or prevent excessive extraneous energy dissipation. Out of plane point force, random in nature was applied to the top middle of the plates and the responses were measured from the middle point of the plates by FFT analyzer using miniature small mass accelerometer as sensor. The aim of these tests is to investigate the effects of bending rigidity and mode orders over material loss factor. The values of estimated modal damping loss factors are compared and tabulated for the plates models considered. Natural frequencies of some of the initial modes of the plates are also presented. It is observed that the higher the value of bending rigidity of the plates, the larger the values of loss factor of it. There was a significant increase in value of loss factor in corrugated plates to that of the isotropic plate.

Item Type:Article
Uncontrolled Keywords:repeatability, vibration control, vibration damping, loss factor, trapezoidal shape, orthotropic plate, bandwidth, measurement method, experimental study, steel, corrugated plate
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:7045
Deposited By: Mr Mohd Shukri Ramli
Deposited On:17 Dec 2008 03:34
Last Modified:14 Mar 2017 08:38

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