Piezoelectrically actuated hydraulic valve design for high bandwidth and flow performance
Piezoelectrically actuated hydraulic valve design for high bandwidth and flow performance
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DOI：
10.1177/09596518jsce1037
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发表时间：
2011-05
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影响因子：
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通讯作者：
D. Branson;F. C. Wang;D. N. Johnston;D. Tilley;C. Bowen;P. Keogh
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文献类型：
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作者：
D. Branson;F. C. Wang;D. N. Johnston;D. Tilley;C. Bowen;P. Keogh
液压机械系统的性能可以通过使用在低压降下具有高带宽和高流量的阀门来改善。虽然使用非常大的阀芯行程和/或直径可以实现高流量，但阀门的整体带宽将会降低。因此，已经对结合霍尔比格板原理的原型阀门设计进行了研究，该原理利用多个计量边缘来在低压降和小提升器位移的情况下获得高流量。利用压电致动器直接启动阀门，以实现快速动态响应。使用数学模型评估阀门性能，该数学模型包括压电致动器和功率放大器、供应流量、流体挤压力、末端停止响应和阀门机械部件。利用计算流体力学软件确定了阀门流量、压力、压降以及流体惯性之间的稳态关系。利用样机试验获得的试验数据对仿真模型进行了验证。计算结果与实测值吻合较好，表明该阀能够在1.5ms内完全开启或关闭，在压降为20bar的情况下，流量可达65L/min。
The performance of hydraulically actuated machine systems could be improved with the use of valves that have high bandwidth and high flowrates under low pressure drops. Although high flowrates can be achieved using very large spool strokes and/or diameters, the overall bandwidth of the valve will be reduced. Research has therefore been undertaken on a prototype valve design incorporating the Horbiger plate principle, which utilizes multiple metering edges to allow high flowrates to be obtained at low pressure drops and small poppet displacements. The valve is directly activated using a piezoelectric actuator to achieve a fast dynamic response. Valve performance is assessed using a mathematical model that includes the piezoelectric actuator and power amplifier, the supply flow, fluid squeeze forces, end stop response, and valve mechanical components. The steady state relationship between valve flow, force and pressure drop, and the fluid inertance, were determined using computational fluid dynamics software. The simulation model has been validated using test data obtained from experimental tests undertaken on a prototype valve. Good agreement is obtained between the predicted and measured results and it is shown that the valve is capable of opening or closing fully in less than 1.5 ms, and can pass a flow of 65l/min at a pressure drop of 20 bar.