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Performance Optimization of Thermoacoustic Systems by Measurement with Two-microphone Method

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The selection of operating frequencies is a key step to optimize the performance of thermoacoustic systems, and a minor frequency mismatch can cause a serious drop of the efficiency. Generally, the characteristic frequency of the resonance pipe is a significant factor to determine the operating frequency, however, in a thermoacoustic refrigerator driven by an electrodynamic loudspeaker, the match between the loudspeaker and resonance pipe cannot be ignored. The two-microphone method is used to determine the operating frequency of a thermoacoustic system, meanwhile, the proper position for the stack is also determined. It is demonstrated that the two-microphone method, which can be used to obtain the sound pressure, particle velocity and acoustic impedance distributions in the pipe, is proper to determine the working conditions of a thermoacoustic system driven by an electrodynamic loudspeaker.
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Document Type: Research Article

Publication date: September 1, 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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