基于HHT的液压缸动态特性分析新方法
|
摘要
提出了一种基于Hilbert-Huang变换的液压缸动态特性分析的新方法:运用经验模态分解,把周期激励下液压缸油液压力波动信号分解为多个从高频到低频的本征模态函数分量,依据各分量的Hilbert边际谱以及自由振动频率信息,对各分量分类并以此为基础重构信号,提取出反映液压缸动态特性的自由振动分量。此方法在某试验台液压缸动态特性分析中,取得了良好的效果,提取出的自由振动分量,可以作为评价液压缸动态特性好坏的依据。
A new method based on HHT to analyze dynamic characteristics of a hydraulic cylinder was proposed.The oil pressure fluctuation signal under periodic excitation was decomposed into IMFs by using EMD.Then,IMFs were classified using the Hilbert marginal spectrum of each IMF and the frequency of the free vibration and forced vibration.The signal was reconstructed after the classification,the free vibration component reflecting the dynamic characteristics of the hydraulic cylinder was extracted.The result showed that the proposed method has good performance to analyze the dynamic characteristics of a hydraulic cylinder,and the free vibration component extraced can be a basis to evaluate the dynamic characteristics of a hydraulic cylinder.
A new method based on HHT to analyze dynamic characteristics of a hydraulic cylinder was proposed.The oil pressure fluctuation signal under periodic excitation was decomposed into IMFs by using EMD.Then,IMFs were classified using the Hilbert marginal spectrum of each IMF and the frequency of the free vibration and forced vibration.The signal was reconstructed after the classification,the free vibration component reflecting the dynamic characteristics of the hydraulic cylinder was extracted.The result showed that the proposed method has good performance to analyze the dynamic characteristics of a hydraulic cylinder,and the free vibration component extraced can be a basis to evaluate the dynamic characteristics of a hydraulic cylinder.
引文
[1]李永堂,高步芳,高雨茁.液压系统建模与仿真[M].北京:冶金工业出版社,2003.
[2]杨立志.基于小波分析/AMEsim的液压缸泄漏故障诊断的仿真研究[D].长春:吉林大学,2007.
[3]丁问司,黄晓东.自配流型液压冲击器建模与仿真[J].振动与冲击,2010,29(2):103-106.
[4]包海涛.基于功率键合图的液压缸动态特性研究[J].煤矿机械,2008,29(10):47-48.
[5]王艾伦,钟掘.一个复杂非线性液压系统的建模和仿真[J].机械科学与技术,1999,18(4):521-524.
[6]王林鸿,吴波,杜润生,等.液压缸运动的非线性动态特征[J].机械工程学报,2007,43(12):12-19.
[7]张郁山.希尔伯特-黄(HHT)变换与地震动时程的希尔伯特谱[D].北京:中国地震局地球物理研究所,2003.
[8]杨宇,于德介,程军圣.基于Hilbert边际谱的滚动轴承故障诊断方法[J].振动与冲击,2005,24(1):70-72.
[9]Huang N E,Shen Z,Long S R,et al.The empirical modedecomposition and hilbert spectrum for nonlinear andnonstationary time series analysis[J].Proc.Roy.Soc.Lond.,1998,454,(1971).903-995.
[10]吴剑,代冀阳,孙秀霞.非平稳振动信号的角域重采样小波解调分析方法[J].振动与冲击,2009,28(5):137-141,159.
[11]李军.飞机液压系统压力脉冲试验的机理分析与控制[D].西安:西北工业大学,2007.
[12]张建明,张卫刚,等.柴油高压物理特性的研究[J].高压物理学报,2005,19(1):41-44.
[2]杨立志.基于小波分析/AMEsim的液压缸泄漏故障诊断的仿真研究[D].长春:吉林大学,2007.
[3]丁问司,黄晓东.自配流型液压冲击器建模与仿真[J].振动与冲击,2010,29(2):103-106.
[4]包海涛.基于功率键合图的液压缸动态特性研究[J].煤矿机械,2008,29(10):47-48.
[5]王艾伦,钟掘.一个复杂非线性液压系统的建模和仿真[J].机械科学与技术,1999,18(4):521-524.
[6]王林鸿,吴波,杜润生,等.液压缸运动的非线性动态特征[J].机械工程学报,2007,43(12):12-19.
[7]张郁山.希尔伯特-黄(HHT)变换与地震动时程的希尔伯特谱[D].北京:中国地震局地球物理研究所,2003.
[8]杨宇,于德介,程军圣.基于Hilbert边际谱的滚动轴承故障诊断方法[J].振动与冲击,2005,24(1):70-72.
[9]Huang N E,Shen Z,Long S R,et al.The empirical modedecomposition and hilbert spectrum for nonlinear andnonstationary time series analysis[J].Proc.Roy.Soc.Lond.,1998,454,(1971).903-995.
[10]吴剑,代冀阳,孙秀霞.非平稳振动信号的角域重采样小波解调分析方法[J].振动与冲击,2009,28(5):137-141,159.
[11]李军.飞机液压系统压力脉冲试验的机理分析与控制[D].西安:西北工业大学,2007.
[12]张建明,张卫刚,等.柴油高压物理特性的研究[J].高压物理学报,2005,19(1):41-44.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心