Archives of Acoustics, 37, 2, pp. 181–188, 2012

Shape Optimization of Two-layer Acoustical Hoods Using an Artificial Immune Method

Min-Chie CHIU
Department of Mechanical and Automation Engineering, Chung Chou University of Science and Technology

Research on acoustical hoods used in industry has been widely discussed; however, the assessment of
shape optimization on space-constrained close-fitting acoustic hoods by adjusting design parameters has
been neglected. Moreover, the acoustical performance for a one-layer acoustic hood used in a high intensity
environment seems to be insufficient. Therefore, an assessment of an optimally shaped acoustical hood
with two layers will be proposed. In this paper, a numerical case for depressing the noise level of a piece
of equipment by optimally designing a shaped two-layer close-fitting acoustic hood under a constrained
space will be introduced. Furthermore, to optimally search for a better designed set for the multi-layer
acoustical hood, an artificial immune method (AIM) has been adopted as well. Consequently, this paper
provides a quick and effective method to reduce equipment noise by optimally designing a shaped multi-
layer close-fitting acoustic hood via the AIM searching technique.
Keywords: multi-layer; close-fitting acoustical hood; artificial immune method
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