QIAN Duo-zhou， GU Li-chen， YANG Sha， MA Zi-wen
（School of Mechatronic Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China）
Abstract： In the pump-controlled motor hydraulic transmission system, when the pressure pulsation frequencies seperately generated by the pump and the motor are close to each other, the hydraulic system will generate a strong pressure beat vibration phenomenon, which will seriously affect the smooth running of the hydraulic system. However, the modulated pressure signal also carries information related to the operating state of the hydraulic system, and a accurate extraction of pressure vibration characteristics is the key to obtain the operating state information of the hydraulic system. In order to extract the pressure beat vibration signal component effectively from the multi-component time-varying aliasing pressure signal and reconstruct the time domain characteristics, an extraction method of the pressure beat vibration characteristics of the hydraulic transmission system based on variational mode decomposition (VMD) is proposed. The experimental results show that the VMD method can accurately extract the pressure beat vibration characteristics from the high-pressure oil pressure signal of the hydraulic system, and the extraction effect is preferable to that of the traditional signal processing methods such as empirical mode decomposition(EMD).
Key words： hydraulic drive system; pressure beat vibration; variational mode decomposition (VMD); characteristic extraction
CLD number： TP 271+.31doi： 10.3969/j.issn.1674-8042.2020.03.005
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基于变分模态分解的液压系统压力拍振特征提取方法
钱铎宙， 谷立臣， 杨莎， 马子文
（西安建筑科技大学 机电工程学院， 陕西 西安 710055）
摘要:在泵控马达液压传动系统中， 当泵与马达产生的压力脉动频率相接近时， 液压系统会产生强烈的压力拍振现象， 影响系统运行的平稳性。 但由于被调制的压力信号中含有与系统运行状态有关的信息， 为从混叠的多成分时变信号中有效提取压力拍振信号、 重构时域特征， 提出了一种基于变分模态分解（Variational mode decomposition, VMD）的液压传动系统压力拍振特征提取方法。 实验结果表明， 利用VMD方法能够准确从液压系统高压油路压力信号中提取压力拍振分量， 提取效果优于经验模态分解（Eempirical mode decomposition, EMD）等传统信号处理方法。
关键词:液压传动系统； 压力拍振； 变分模态分解； 特征提取
引用格式：QIAN Duo-zhou， GU Li-chen， YANG Sha， et al. An extraction method for pressure beat vibration characteristics of hydraulic drive system based on variational mode decomposition. Journal of Measurement Science and Instrumentation, 2020, 11（3）： 228-235. ［doi： 10.3969／j.issn.1674-8042.2020.03.005］
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