基于SWT切片谱-矩分析的磁流变振动系统的时频特性研究  

Time-frequency Characteristics Research of MR Vibrating System Based on SWT Diagonal Slice and its Moment Analysis

作　　者：陈庆堂[1] 黄宜坚[2] 宋一然[1] 黄廖山[3] 吴融生[3] 

机构地区：[1]莆田学院机电工程学院,福建莆田351100 [2]华侨大学机电及自动化学院,福建厦门361021 [3]湄洲湾职业技术学院,福建莆田351254

出　　处：《贵州大学学报（自然科学版）》2015年第1期54-60,共7页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金课题资助(50975098);福建省教育厅中青年教师科技A类资助(JA13434)

摘　　要：为了研究专用自主研制的磁流变振动系统的动态性能,分析其最优的工作条件,在比较SWB切片和SWT切片时频特性的基础上,首次提出了运用SWT切片谱-矩分析相结合的方法,绘制了SWT切片谱矩-状态参数关系的估计模型曲线,分析研究不同工作条件下系统振动信号的时频特性变化。研究分析表明,SWT切片谱比SWB切片谱具有更好的时频聚集性和分辨率,更适合用于非线性、非高斯、非平稳的振动信号时频特性分析;SWT切片谱矩是量化表达其谱图特征的有效方法,可减小人工识读谱图的工作量和主观性,切片谱-矩特征一致反映了系统随工作状态参数变化特征;SWT切片谱-矩结合方法是定性和定量分析系统特性的适用方法,对振动系统最优工况参数选取与性能预测具有重要推广意义。In order to study the dynamic performance of special self-developed magnetorheological （MR） vibra- ting system, and analyze the optimum working conditions, based on time-frequency characteristics comparison of SWB （smoothed wigner bispectrum） and SWT（ smoothed wigner trispectrum）slices, the method of using the com- bination of SWT slice spectrum and its moment analysis was put forward for the first time, the relation curve of estimation model between SWT slice spectrum moment and state parameter was mapped, and the changes of time- SWT slice spectrum-moment was suggested characteristics, which is very important in formance of the MR vibrating system. as a suitable method for qualitative and quantitative analysis of system selecting the optimum working state parameters and predicting the per-formance of the MR vibrating system.

关 键 词：SWT对角切片 时频特性 谱矩分析 

分 类 号：TB381[一般工业技术—材料科学与工程]