摘要
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.
The quality of single frequency about the automobile suspension vibration rig, which works with the frequency-scan mode, is analyzed. The symbol-chaos characteristics, which could distinguish the noise degree of signal for the symbol probability series, was constructed with the four parameters that were the symbolic Shannon entropy, the symbolic Kolmogrov entropy, the symbolic correlation dimension and the symbolic Lyapunov index based on the principle to calculate the symbol parameters and chaos parameters for the time series. The symbol-chaos characteristics were used to identify the vibration signal measured from an automobile suspension vibration rig with the mode of ACXX-160. The results show that： （ 1 ） Whether frequency-scan vibration or frequency-even vibration, the vibration signal from the rig has the property of chaos. （2）Comparing frequency-scan vibration with frequency-even vibration, the vibration signal from the rig has the property of ganss-broadband meanwhile the noise degree of vibration signal is stronger. Therefore there isn＇t the high quality of single frequency characteristic in the mode of frequency-scan vibration. 5figs., ltab., 13refs.
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2009年第2期28-32,共5页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
江苏省"六大人才高峰"项目(07-D-014)
江苏省高校自然科学基础研究项目(07KJD580084)
南京工程学院科研基金重大项目(科07-106)
关键词
汽车工程
悬架振动实验台
扫频
符号混沌特征
vehicle engineering
suspension vibration rig
frequency-scan
symbol-chaos characteristics
