| 振动模态固有频率和阻尼比的EMD识别方法 |
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| 引用本文： | 莫平杰,杨世锡,曹冲锋.振动模态固有频率和阻尼比的EMD识别方法[J].机电工程,2011,28(4):392-396,428. |
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| 作者姓名： | 莫平杰 杨世锡 曹冲锋 |
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| 作者单位： | 浙江大学机械工程学系,浙江杭州,310027 |
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| 基金项目： | 国家自然科学基金资助项目(11072214); 国家高技术研究发展计划(“863”计划)资助项目(2008AA04Z410) |
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| 摘 要： | 针对机械系统固有频率和阻尼比的识别问题,提出了基于经验模式分解(EMD)的模态参数识别方法.该方法首先对脉冲激励下机械系统的位移响应进行了EMD分解,确定与该系统的各阶模态对应的固有模式函数(IMF),分别对各阶IMF进行希尔伯特变换以得到各自的瞬时幅值和瞬时相位曲线,并对所得曲线进行线性拟合,最后根据拟合曲线的参数来...
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| 关 键 词： | 经验模式分解 模态分析 固有频率 阻尼比 |
EMD method on identifying natural frequency and damping ratio of vibration mode |
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| MO Ping-jie,YANG Shi-xi,CAO Chong-feng.EMD method on identifying natural frequency and damping ratio of vibration mode[J].Mechanical & Electrical Engineering Magazine,2011,28(4):392-396,428. |
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| Authors: | MO Ping-jie YANG Shi-xi CAO Chong-feng |
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| Affiliation: | MO Ping-jie,YANG Shi-xi,CAO Chong-feng(Department of Mechanical Engineering,Zhejiang University,Hangzhou 310027,China) |
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| Abstract: | In order to indentify the modal parameters of the mechanical systems,a modal parameter identification method based on the empirical mode decomposition(EMD) was investigated.The EMD method was employed to decompose the vibration signals of a mechanical system under impulsive excitation.Different modal components with lower orders were picked up,and then the Hilbert transform was applied to identify their natural frequencies and damping ratios from the intrinsic mode functions(IMF).The modal analysis by ANSYS... |
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| Keywords: | empirical mode decomposition(EMD) modal analysis natural frequency damping ratio |
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