基于耦合尾流振子的单自由度非线性圆柱涡振模型，开展了不同时间尺度随机来流下圆柱横向涡振的数值研究。分别建模实现具有不同长短时间尺度特征的随机来流，并计算得到涡振横向位移响应时间序列，利用相空间重构和李亚普诺夫指数对位移响应进行非线性特征分析。结果表明：两种来流下系统均出现噪声诱导间歇性现象，短时随机来流下出现“突发型”间歇，而长时随机来流下表现为“开-关型”间歇。

Based on the nonlinear structural vibration equation coupled with the cylindrical vortex vibration model of the wake oscillator,the numerical study of the cylindrical vortex vibration of the random incoming flow at different time scales was carried out. Respectively modeled to realize the fluctuating incoming flow with different length and time scale characteristics,and calculate the axial displacement response time series of the vortex vibration system. Phase space reconstruction and Lyapunov exponent were used to analyze the nonlinear characteristics of the displacement response. The results show that the noiseinduced intermittency occurs in the two types of incoming flow systems,and there are "bursty" type intermittency in the shortterm flow and "onoff" type intermittency in the longterm flow.

U441

国家自然科学基金（11872249）