中文摘要：

提出回热器特征频率的概念，以热声器件的热动力学理论为基础，建立起热声回热器的分布参数网络模型，以实例分析并用Matlab编程计算回热器不同工质下的特征频率，得出了单一He气和He、Ar混合气体下回热器的特征频率分别为565rad／s和1300rad／s以及回热器的阻抗特性和不同工作压力对回热器阻抗影响的关系图。通过计算分析以便为回热器与系统更好地匹配，以及为回热器热声转换效率的提高提供依据。

英文摘要：

Given the concept of the characteristic frequency for regenerator, distributed parameter network model of thermoacoustic stack was respectively built on basis of thermodynamics theory of stack. The practical examples of calculations using Matlab program of characteristic frequency with different refrigerants in regenerator were anylied. The characteristic frequency of single gas He and He-Ar mixed gas was 565 rad/s and 1 300 rad/s respectively, the impedance characteristics of regenerator and impedance plans of different work pressure in the regenerator were obtained. It shown that the analysis can provide basis for regenerator to match system better and get higher heat conversion efficiency.