NDLI: A Design Method for Minimizing the Sound Power Radiated from Plates by Adding Optimally Sized, Discrete Masses

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Pierre, R. L. St. Koopmann, G. H.
Copyright Year	1995
Abstract	In this paper, a novel method for minimizing the sound power radiated from a structure is presented. The method involves placing strategically sized masses at specific locations on the structure’s surface. The minimization procedure modifies the shapes of the resonant modes of the structure in the frequency range of interest such that they are forced to radiate sound inefficiently. Because of this, they are referred to as “weak radiator” mode shapes. The method uses an optimization procedure that directly minimizes the radiated sound power from the surface of a plate in an infinite baffle. The procedure can be carried out for a single frequency or over a range of frequencies. Analytical sensitivities of sound power with respect to the design variables are developed and used in the optimization algorithm. Results on various test cases show sound power reductions of 10 dB or more even when several resonances are included in the frequency band. An acoustic intensity probe is used to experimentally verify the results for one test case. The experiment confirms the sound power reductions predicted by the optimization program.
Starting Page	243
Ending Page	251
Page Count	9
File Format	PDF
ISSN	10489002
e-ISSN	15288927
Journal	Journal of Vibration and Acoustics
Volume Number	117
Issue Number	b
DOI	10.1115/1.2838669
Language	English
Publisher	The American Society of Mechanical Engineers
Publisher Date	1995-06-01
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acoustic intensity Design Design methodology Electromagnetic spectrum Optimization Optimization algorithms Plates (structures) Probes Shapes Sound
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Mechanics of Materials Mechanical Engineering

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