caa a22 4500 463244036 CHVBK 20180405153320.0 cr unu---uuuuu 170326e20070401xx s 000 0 eng 10.1007/s00158-006-0088-9 doi (NATIONALLICENCE)springer-10.1007/s00158-006-0088-9 Minimization of sound radiation from vibrating bi-material structures using topology optimization [Elektronische Daten] [Jianbin Du, Niels Olhoff] Up to now, work on topological design optimization of vibrating structures against noise radiation has mainly addressed the maximization of eigenfrequencies and gaps between consecutive eigenfrequencies of free vibration, and minimization of the dynamic compliance subject to harmonic loading on the structure. In this paper, we deal with topology optimization problems formulated directly with the design objective of minimizing the sound power radiated from the structural surface(s) into a surrounding acoustic medium. Bi-material elastic continuum structures without material damping are considered. The structural vibrations are excited by time-harmonic external mechanical loading with prescribed frequency and amplitude. It is assumed that air is the acoustic medium and that a feedback coupling to the structure can be neglected. Certain conditions are assumed that imply that the sound power emission from the structural surface can be obtained in a simpler way than by solving Helmholz' integral equation. Hereby, the computational cost of the structural-acoustical analysis is substantially reduced. Several numerical results are presented and discussed for plate- and pipe-like structures with different sets of boundary and loading conditions. Springer-Verlag Berlin Heidelberg, 2007 Topology design nationallicence Bi-material structures nationallicence Sound power radiation nationallicence Time-harmonic loading nationallicence Structural-acoustical analysis and optimization nationallicence Du Jianbin Department of Mechanical Engineering, Aalborg University, 9220, Aalborg East, Denmark aut Olhoff Niels Department of Mechanical Engineering, Aalborg University, 9220, Aalborg East, Denmark aut Structural and Multidisciplinary Optimization Springer-Verlag 33/4-5(2007-04-01), 305-321 1615-147X 33:4-5<305 2007 33 158 https://doi.org/10.1007/s00158-006-0088-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00158-006-0088-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Du Jianbin Department of Mechanical Engineering, Aalborg University, 9220, Aalborg East, Denmark aut NATIONALLICENCE 700 1- Olhoff Niels Department of Mechanical Engineering, Aalborg University, 9220, Aalborg East, Denmark aut NATIONALLICENCE 773 0- Structural and Multidisciplinary Optimization Springer-Verlag 33/4-5(2007-04-01), 305-321 1615-147X 33:4-5<305 2007 33 158 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer