NDLI: Advances in Sandwich Structural Optimization for Noise Transmission Reduction

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Denli, H. Sun, Jian-Qiao
Copyright Year	2006
Abstract	The sandwich structures in aerospace industry experience high noise transmissions since they are often stiff and light, and have low damping. Optimization studies of sandwich structures for noise transmission are relatively fewer. Most optimization studies in composite sandwich community seek for high stiffness with minimal weight. Advanced sandwiches must meet not only stiffness to weight ratio demands, but also have improved acoustic transmission performance. This paper presents recent advances in optimization of sandwich structures for minimum sound transmission. The finite element models of sandwich beams and plates are presented in this paper. The acoustic radiation of the structure is computed by using the Rayleigh integral. Sensitivity plays an important role in optimization studies. Analytical expressions of sensitivity can improve computational efficiency dramatically and accuracy at the same time. The explicit sensitivity functions of power and natural frequencies with respect to design parameters are derived in this work. In the optimization studies, we have considered structural parameters that can influence the transverse propagation of sound from the sandwich to the acoustic medium. These parameters include core topology and coupling stiffiness between in- and out-of-plane strains. We also study the optimization of the structure with respect to the structural boundary conditions to minimize the sound transmission. Numerical examples of single tone and broadband applications are presented in the paper. The results show that significant reduction of sound transmission across sandwich structures can be obtained. Finally, it should be noted that the novel optimized sandwich structures can meet not only stiffness to weight ratio demands, but also have significantly improved acoustic performance.
Sponsorship	Design Engineering Division and Computers and Information in Engineering Division
Starting Page	441
Ending Page	450
Page Count	10
File Format	PDF
ISBN	0791847675
DOI	10.1115/IMECE2006-13377
e-ISBN	0791837904
Volume Number	Design Engineering and Computers and Information in Engineering, Parts A and B
Conference Proceedings	ASME 2006 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2006-11-05
Publisher Place	Chicago, Illinois, USA
Access Restriction	Subscribed
Subject Keyword	Damping Acoustics Sound Topology Sandwich structures Optimization Aerospace industry Noise (sound) Design Finite element model Composite materials Structural optimization Radiation (physics) Weight (mass) Plates (structures) Boundary-value problems Stiffness
Content Type	Text
Resource Type	Article

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