Control of Sound Transmission Through Double Wall Partitions Using Optimally Tuned Helmholtz Resonators
Arrangement of Helmholtz resonators (HRs) used for the passive control of sound transmission through a double wall partition is investigated. An analytical model of fully coupled structural-acoustic-HRs inside a double wall partition is presented and the closed form solution for the cavity pressure with HRs is established. The optimal parameters of HRs (damping ratio, numbers, natural frequency, etc.) maximising the improvement of the sound transmission loss of HRs is discussed in detail. Results indicate that tuning the HRs to the mass-air-mass resonance frequency does not guarantee the best possible improvement of the sound transmission loss. Using the frequency averaged sound transmission loss as the cost function to optimise the natural frequency of the HRs is a more effective method to find the HRs tuning frequency in order to maximise the improvement of sound transmission loss. Finally, the simulation results show that the sound transmission loss around the mass-air-mass resonance frequency can be improved significantly using the proposed optimally tuned HRs. The performance of the HRs is stable for incident plane waves of various incident angles.
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Document Type: Research Article
Publication date: 01 July 2005
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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