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<p>The excitation frequency of traditional electro-hydraulic fatigue test systems is primarily limited by the frequency response of the servo valve. The relatively low frequency response of the servo valve makes it difficult to achieve high-frequency excitation, even when sacrificing part of the amplitude. To address this issue, an innovative two-stage high-flow, high-speed directional valve configuration is proposed and integrated into the electro-hydraulic fatigue test system. This design aims to increase the excitation frequency, enhance the amplitude of the output characteristics, and the fatigue test cycle time is reduced. A nonlinear mathematical model of the high-frequency fatigue test system was developed, and a corresponding simulation model was constructed. A prototype experimental system was built to verify the accuracy of the simulation model and analyze the output characteristics. The effects of different operating frequencies and oil supply pressures on the dynamic characteristics of the high-frequency fatigue test system were subsequently analyzed by the simulation model. The results show that the proposed new two-stage high-speed high-flow directional valve can realize 400&#xa0;Hz high-frequency output, compared with the traditional two-stage valve has a certain frequency enhancement, and the output dynamic characteristics are negatively correlated with the operating frequency and positively correlated with the oil supply pressure. Both experiment and simulation show that two-stage, high-speed, high-flow directional valves and their fatigue test systems provide excellent high-frequency dynamic performance, and the output characteristics can be changed by the operating frequency and oil supply pressure. For future use in fatigue test systems, high-frequency excitation of 400&#xa0;Hz can be realized, which increases the output frequency by nearly 50% compared to traditional fatigue test systems. The results of this study provide a new idea for effectively improving the high frequency dynamic performance of electro-hydraulic fatigue test systems.</p>

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Output characterization of two-stage high-flow high-speed directional valve applied in the high-frequency fatigue test system

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Can Chen,
  • Yan Ren,
  • Aleksei Silaev,
  • Qi Zhong,
  • Jian Ruan

摘要

The excitation frequency of traditional electro-hydraulic fatigue test systems is primarily limited by the frequency response of the servo valve. The relatively low frequency response of the servo valve makes it difficult to achieve high-frequency excitation, even when sacrificing part of the amplitude. To address this issue, an innovative two-stage high-flow, high-speed directional valve configuration is proposed and integrated into the electro-hydraulic fatigue test system. This design aims to increase the excitation frequency, enhance the amplitude of the output characteristics, and the fatigue test cycle time is reduced. A nonlinear mathematical model of the high-frequency fatigue test system was developed, and a corresponding simulation model was constructed. A prototype experimental system was built to verify the accuracy of the simulation model and analyze the output characteristics. The effects of different operating frequencies and oil supply pressures on the dynamic characteristics of the high-frequency fatigue test system were subsequently analyzed by the simulation model. The results show that the proposed new two-stage high-speed high-flow directional valve can realize 400 Hz high-frequency output, compared with the traditional two-stage valve has a certain frequency enhancement, and the output dynamic characteristics are negatively correlated with the operating frequency and positively correlated with the oil supply pressure. Both experiment and simulation show that two-stage, high-speed, high-flow directional valves and their fatigue test systems provide excellent high-frequency dynamic performance, and the output characteristics can be changed by the operating frequency and oil supply pressure. For future use in fatigue test systems, high-frequency excitation of 400 Hz can be realized, which increases the output frequency by nearly 50% compared to traditional fatigue test systems. The results of this study provide a new idea for effectively improving the high frequency dynamic performance of electro-hydraulic fatigue test systems.