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为研究电磁阀响应时间对脉冲宽度调制(pulse width modulation,PWM)变量喷施系统液压冲击的影响,该文构建PWM变量喷施系统流道的三维仿真模型,设定不同的电磁阀开启和闭合时间,利用Fluent软件模拟分析了电磁阀启闭时系统管路内液压冲击的变化。模拟结果表明:电磁阀启闭时所产生的液压冲击随电磁阀响应时间的增加而减小。利用PWM变量喷施系统对电磁阀启闭过程中的管路压力变化进行了试验测试,试验结果与模拟结果吻合,最大水击压强之间的相对误差小于10%。对电磁阀闭合所引起的液压冲击进行理论分析,间接最大水击压强公式适用于PWM变量喷施系统中电磁阀高速闭合时所引起的液压冲击的计算,并且电磁阀开启与闭合所引起的液压冲击呈线性关系,比例系数为1.91。研究可为系统中其他液压元件动态特性的研究提供理论支持。
In order to study the influence of solenoid valve response time on the hydraulic shock of variable width pulse width modulation (PWM) injection system, this paper constructs a three-dimensional simulation model of PWM variable flow channel, sets different solenoid valves to open and close Time, the use of Fluent software to simulate the solenoid valve opening and closing the system within the pipeline hydraulic impact changes. The simulation results show that the hydraulic shock generated when the electromagnetic valve is opened and closed decreases with the increase of the response time of the solenoid valve. The test results are in good agreement with the simulation results. The relative error between the maximum water hammer pressure is less than 10%. The theoretical analysis of the hydraulic shock caused by the closing of the solenoid valve is applied to the calculation of the hydraulic shock caused by the high-speed closing of the electromagnetic valve in the PWM variable spraying system, and the hydraulic pressure caused by the opening and closing of the solenoid valve The impact is linear, with a scale factor of 1.91. The research can provide theoretical support for the research of dynamic characteristics of other hydraulic components in the system.