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1·A new approach to the designing of hydraulic vibrating system on the principle of self-sustained oscillation is proposed.

本文提出了一种运用自激振荡原理设计液压振动系统的新方法。

2·Self-sustained oscillation characteristic of thermoacoustic stack is quantitatively proven based on thermodynamic theory to be negative damped oscillation.

从热动力学理论出发，定量地证明回热器的自激振荡特性为负阻尼振荡。

3·In the experiment it is found that at a certain external flow velocity and cavity size a strongly self sustained flow oscillation in the cavity would appear.

实验发现，在一定的气流速度和空腔几何尺寸下，空腔内流动会出现强烈的自持振荡。