Analysis of self-sustained oscillations in digital control systems& the discrete describing function method and its application 数字控制系统的自振荡分析&离散描述函数法及其应用
SR-like behavior of the coherence motion can be induced purely by noise even in the absence of an external signal for system, such as self-sustained oscillations at close to bifurcation point. 当系统不存在外加激励时,噪声可以诱导相干运动的类随机共振行为,如在分岔点处的自振荡等,这种现象称为相干共振,或自随机共振。
FFT analysis method is used to analyze the experimental data of the self-sustained oscillations and noise. Then the experimental results are compared with the theoretical analysis results. It shows that the theoretical analysis is reasonable. 采用傅立叶变换分析方法对射流流场中的自激压力振荡和自激噪声数据进行了分析,并与仿真分析结果进行了比较,从而进一步验证了理论分析的正确性。