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

在这项研究中，提出了一种能衰减管道中单个行波的有源噪声控制系统。在奈奎斯特稳定性判据的基础上，证明了环管式热声系统与本文提出的系统相结合，更容易发生自激振荡；通过反馈控制驻波型热声发动机的压力，可以使管内的压力幅值稳定在温度梯度和/或热源波动的影响下。

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.