Acoustic topology optimization of sound power using mapped acoustic radiation modes |
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| Affiliation: | 1. Institute of Vibration, Shock & Noise, Shanghai Jiao Tong University, Shanghai 200240, China;2. School of Mechanical and Manufacturing Engineering, UNSW Australia, Sydney NSW 2052, Australia;1. School of Mechanical Engineering, Northwestern Polytechnical University, 127 Youyi Xilu, Xi’an, Shaanxi, China;2. Department of Applied Mathematics, Illinois Institute of Technology, 10 West 32nd Street, Chicago, IL, USA;1. Groupe d''Acoustique de l''Université de Sherbrooke, Sherbrooke, Canada;2. Centre for Interdisciplinary Research in Music, Media, and Technology, Montréal, Canada;1. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, China;2. Institute of Vibration, Shock and Noise, Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China;3. Department of Mechanical and Aerospace Engineering, School of Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;1. Global Trailer R&D Institute, China International Marine Containers (Group) Co., Ltd., Shenzhen, China;2. Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Hong Kong, China;3. Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA |
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| Abstract: | An efficient approach for acoustic topology optimization to minimize the radiated sound power from a vibrating structure is described. The topology optimization is implemented by modifying the local stiffness at discrete locations on the surface of the structure. The radiated sound power level from the structure is directly chosen as the objective function to be minimized. A sensitivity analysis is then implemented to further optimize the layout of the locations of the modified local stiffness. To speed up the computational process, the radiated sound power is computed based on mapped acoustic radiation modes. To demonstrate the acoustic topology optimization using mapped acoustic radiation modes, the radiated sound power of a compressor housing is examined. Based on results from the numerical model, the local stiffness of a compressor housing was experimentally modified. Good agreement in sound power reduction obtained both numerically and experimentally was observed for the overall trend for the sound power levels as a function of one-third octave frequency bands. |
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| Keywords: | Noise reduction Compressor housing Mapped acoustic radiation modes Structural-acoustic optimization |
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