Abstract
In order to miniaturize thermoacoustic refrigerators, piezoelectric loudspeakers are used as acoustic sources for operating at high resonance frequencies. An integrated equivalent circuit model of a thermoacoustic resonance pipe driven by a piezoelectric loudspeaker is presented to investigate the coupling conditions between the piezoelectric loudspeaker and thermoacoustic resonance pipe. Using the equivalent circuit model the optimized coupling conditions can be obtained, with which the highest electroacoustic transfer efficiency and the largest acoustic output power of a piezoelectric acoustic source can be achieved. The theoretical simulations are taken to optimize the structures and the operating frequencies of the thermoacoustic systems.
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