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Improvement in Dynamic Properties of a Pilot-Operated Gas Pressure Control Valve

机译:先导式气压控制阀的动态性能改善

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In this paper, dynamics of a pilot-operated gas pressure control valve are studied through measurement and mathematical modeling for the purpose of obtaining high accuracy and stability over a wide range of flow rate. The pilot stage helps to increase accuracy. However, fluid-born noise and vibration often occur in such type of valves and pressure controllers running at supersonic pressure drop and high flow rate value. These phenomena are caused by instability of balance of the valve in a flow, instability of damping and friction forces. In the paper, the analytical and experimental research is carried out to reveal the most essential factors influencing stability and dynamic properties of the valve. The nonlinear and simplified linear models based on the perturbation technique are developed to predict the stability domain in the space of structural and operational parameters. The stability criterion for the system is deduced using D-decomposing method. CFD software is employed to study the effect of the poppet geometry on aerodynamic lifting force. Simulation is carried out with MatLab/Simulink, considering factors that influence on the dynamic properties of the valve such as lifting force, nonlinear friction and pilot dynamics. The analysis and simulations show general agreement with experimental data. Effective means for obtaining stable operation of the system are proposed.
机译:在本文中,通过测量和数学建模研究了先导式气体压力控制阀的动力学,以便在广泛的流速范围内获得高精度和稳定性。试验阶段有助于提高准确性。然而,在超声波压降和高流量值下运行的这种类型的阀门和压力控制器通常发生流体出生的噪音和振动。这些现象是由阀的平衡在流动,阻尼和摩擦力的不稳定性的情况下引起的。在本文中,进行了分析和实验研究,以揭示影响阀门稳定性和动态性质的最重要因素。开发了基于扰动技术的非线性和简化的线性模型,以预测结构和操作参数空间中的稳定域。使用D-分解方法推导出系统的稳定性标准。 CFD软件用于研究提升阀几何形状对空气动力学提升力的影响。用Matlab / Simulink进行仿真,考虑到影响阀门的动态特性的因素,例如提升力,非线性摩擦和导频动力学。分析与仿真显示了与实验数据的一般协议。提出了获得系统稳定运行的有效手段。

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