以一个正弦扫描振动响应信号为例,分别应用常用的正弦约减法与短时Fourier变换和Wigner分布进行了对比分析,讨论了在正弦扫描振动激励下结构响应的时频分析问题。结果表明,时频分析方法可以更好地揭示结构的非线性特性或由于层间间隙、连接不牢引起的碰撞等动力学行为,是一种更为有效的正弦扫描振动响应分析方法。 Taking a sinusoidal sweep vibration response signal as an example, the commonly used sine reduction method and short-time Fourier transform and Wigner distribution are compared respectively. The time-frequency analysis of the structure response under the excitation of sine sweep vibration is discussed. The results show that the time-frequency analysis method can better reveal the nonlinear characteristics of the structure or the dynamic behaviors such as the collision due to the interlayer gap and the weak connection, which is a more effective method of vibration response analysis of sine sweep.