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TEKNO-Naturvitenskap, grunnleggende teknologi

Development of improved methods for predicting high frequency noise and vibration levels in aerospace and marine vehicles

Tildelt: kr 1,2 mill.

The prediction of high frequency noise and vibration levels in a complex structure is an extremely difficult task, and no fully reliable analysis method exists at present. The most commonly used technique, Statistical Energy Analysis (SEA), provides a goo d prediction in some cases, but it cannot as yet fully account for energy flow along the stiffening members of a typical stringer-skin construction commonly used in the aerospace and marine industries. For example, in the case of a stiffened panel, the present theory gives good results when excitation is applied to the plate itself, while the results are far from satisfactory when considering excitation on the beam. Now, in many engineering applications , the actual dynamic loading on a stiffened structure will in fact come from a source attached to the stiffener(s). Hence, there is need for modifying the existing theory on which SEA is based. This task is not trivial, as there are certain fundamental assumptions in the theory that need to be revised. A detailed study of wave motion in stringer-skin contructions will be performed, and the improved theory will be incorporated into SEA in order to increase the range of applicability of the method.

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TEKNO-Naturvitenskap, grunnleggende teknologi

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