Optimally Designed Shell Enclosures with Tuned Absorbers for Minimizing Sound Power

This paper presents a design methodology for reducing radiated noise from enclosures using multiple optimized tuned absorbers. The methodology starts from the sound power spectrum of the enclosed noise source and ends with optimally sized/located absorbers on a surrounding thin shell enclosure. The...

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Bibliographic Details
Published in:Optimization and engineering Vol. 1; no. 1; pp. 67 - 86
Main Authors: Constans, Eric W., Belegundu, Ashok D., Koopmann, Gary H.
Format: Journal Article
Language:English
Published: Dordrecht Springer Nature B.V 01.06.2000
Subjects:
Electrical engineering
Enclosures
Finite element analysis
Mathematical analysis
Methodology
Optimization
Shells
Sound
Studies
Thin walled shells
Weight reduction
ISSN:1389-4420, 1573-2924
Online Access:Get full text
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Summary:This paper presents a design methodology for reducing radiated noise from enclosures using multiple optimized tuned absorbers. The methodology starts from the sound power spectrum of the enclosed noise source and ends with optimally sized/located absorbers on a surrounding thin shell enclosure. The design approach combines a finite element method vibration prediction code, a boundary element method sound power prediction code and a combined stochastic/gradient-based optimization algorithm. A design example has been optimized for a thin shell covering a motor/gearbox. The addition of a small amount of weight (130 g or 1.6% of the weight of the shell) produced substantial reductions in radiated sound power (13 dB in the targeted 1/3 octave band centered at 125 Hz). The design has been validated by experiment.[PUBLICATION ABSTRACT]
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ISSN:1389-4420
1573-2924
DOI:10.1023/A:1010046506443