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分析了采用扫频激振方式工作的汽车悬架振动实验台的单频质量.根据计算时间序列的符号参数和混沌参数的原理,对符号概率序列构建了能够区分信号含噪程度的符号混沌特征,包括符号S熵、符号K熵、符号关联维和符号李指数4个参数.采用符号混沌特征,辨识实测的ACXX-160汽车悬架振动实验台振动信号,结果表明:(1)无论是扫频激振或等频激振,实验台振动信号均具有混沌性质;(2)扫频激振较之于等频激振,实验台振动信号的含噪程度大大增强,具有宽带随机性质.因此扫频激振方式不具有高质量的单频特性.
Based on the calculation of the symbolic parameters of time series and the principle of chaos parameters, the chaotic features of symbols that can distinguish the degree of signal noises from each other are constructed. , Including four parameters of symbol S entropy, symbol K entropy, symbol correlation dimension and symbol Li index.Using symbolic chaos feature, the vibration signals of the tested ACXX-160 automobile suspension vibration experiment platform are identified.The results show that: (1) Excitation or equal-frequency excitation, the vibration signal of the experimental platform is chaotic. (2) Compared with the equal-frequency excitation, the sweep noise of the experimental platform greatly enhances the noise level of the vibration signal and has the characteristics of wideband randomness. Frequency excitation does not have high-quality single-frequency characteristics.