压力脉动主动抑制是提升数字液压阀控系统控制精度和可靠性的关键技术。然而,目前主动抑制方法在对压力脉动进行抑制时缺乏对其特性的深入理解,导致抑制效果不理想。因此,设计了压力脉动测试试验台,分析了系统中不同位置压力脉动的变化情况,探索了液压泵、高速开关阀对不同位置压力脉动的影响。结果表明:数字液压阀控系统中压力脉动的主要来自于高速开关阀持续开/关引起的水击现象,并且压力脉动的频率始终与阀的开/关频率保持一致。为设计前馈的压力脉动主动抑制系统提供了新思路,同时也为研发更高效的压力脉动衰减器提供了参考。
Abstract
Active suppression of pressure pulsation is the key technology to improve the control accuracy and reliability of digital hydraulic valve control system. However, the current active suppression method lacks an in-depth understanding of its characteristics when suppressing pressure pulsations, resulting in unsatisfactory suppression effects. Therefore, a pressure pulsation test bench was designed, and the changes of pressure pulsation at different positions in the system were analyzed. The influence of hydraulic pumps and high-speed on-off valves on pressure pulsation at different positions was further explored. The results show that the main pressure pulsation in the digital hydraulic valve control system comes from the water hammer phenomenon caused by the continuous on/off of the high-speed on-off valve, and the frequency of the pressure pulsation is always consistent with the on/off frequency of the valve. This study provides a new idea for the design of feedforward active suppression system, and also provides a reference for the development of more efficient pressure pulsation attenuator.
关键词
数字液压 ;
压力脉动 ;
试验分析 ;
高速开关阀
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Key words
digital hydraulic ;
pressure pulsation ;
test analysis ;
high-speed on-off valve
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基金
国家自然科学基金面上项目(51975122);福建省自然基金杰青项目(2022J06009)
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