Active control system for standing wave attenuation in looped-tube-type thermoacoustic refrigerator

本文提出了一种对管道中单行波进行衰减的主动噪声控制系统。基于奈奎斯特稳定性判据的结果表明，结合所提出的系统，环管型热声系统更容易产生自发振荡。在驻波式热声发动机中，通过对压力的反馈控制，可以在温度梯度和/或热源波动的情况下稳定管内压力幅值。

In this study, an active noise control system which attenuates a single traveling wave in duct is proposed. It is shown based on Nyquist stability criterion that a looped-tube-type thermoacoustic system becomes easier to make spontaneous oscillation by combining the proposed system.It is also shown that the pressure amplitude in tube can be stabilized against temperature gradient and/or thermal source fluctuation by feedback control of pressure in a standing-wave-type thermoacoustic engine.