A study of vibration mode shape and noise emission of a rectangular panel
Contemporary procedures for the determination of structural vibration, relies on vast computer storage with excessive time for manipulation. This thesis resorts to an investigation of the vibration and noise radiation of flat panels*. It avoids prolong calculation and presents novel approximate f...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English English |
| Published: |
1999
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/8159/1/24p%20LEE%20WAI%20NENG.pdf http://eprints.uthm.edu.my/8159/2/LEE%20WAI%20NENG%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/8159/3/LEE%20WAI%20NENG%20WATERMARK.pdf |
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| Summary: | Contemporary procedures for the determination of structural vibration, relies on
vast computer storage with excessive time for manipulation. This thesis resorts to an
investigation of the vibration and noise radiation of flat panels*. It avoids prolong
calculation and presents novel approximate formulae devised in this work. An outline of
some of the formulae is given. In vibration of Plates, an approximate method using a
teclmique of 'length equivalencing' reduces and simplifies the classical solution
procedure. A method of determining the local modes of a rectangular plate with a
number of symmetrical parallel stiffeners is also given. This is achieved by observing
linearity in the modal configuration. Hitherto, this phenomenon has not been reported in
research literature. The purpose of investigating the noise radiation of the plates was to
determine the noise level in the proximity of the plate within a room or enclosure. The
room of industrial/manufacturing areas is reverberant hence its acoustic properties must
be measured before prediction of the noise level is possible. The classical property is the
measurement of Reverberation Time CRT). In this investigation, a novel technique of
predicting a family of decay curves of varying absorption coefficient, ex and fitting them
with the actual decay measured has been calculated. Thus a protracted advance into the
detailed conventional acoustic properties was alleviated. |
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