基于超磁致伸缩致动器的脉冲喷射开关阀建模与仿真

Modeling and Simulation of Pulsed Jet On-off Valve Based on GMA

利用超磁致伸缩致动器(Giant magnetostrictive actuator,GMA)应变率大、响应频率高的优点和脉冲喷射装置的结构特点设计了基于GMA的脉冲喷射开关阀,分别分析GMA和脉冲喷射开关阀本体在动态工作条件下的系统传递函数,综合分析后建立阀的流量、喷射速度与驱动电流之间的系统方框图和传递函数。Simulink的开关阀动态仿真结果显示,基于GMA的脉冲喷射开关阀的工作频带宽度大于400Hz,可满足大部分喷射装置的工作要求。GMA位移扫频试验结果表明,该模型在低频范围内可正确反映开关阀的动态特性,高频范围内需考虑温度和磁滞的影响。

The advantages of high strain rate and high response frequency of giant magnetostractive actuator （GMA） and the structure characteristics of pulsed jet on-off device are utilized to build a new kind of pulsed jet on-off valve based on GMA. The system transfer functions of GMA and the main body of pulsed jet on-off valve under dynamic working condition are analyzed respectively. The system block diagram and transfer function between the flux and the jet speed of pulsed jet on -off valve with the driving current are built on the basis of transfer functions of GMA and the main body of the pulsed jet on-off valve. The results of dynamic simulation of on-off valve by Simulink show that the working frequency of the valve is higher than 400 Hz, which fulfills the working requirement of most pulsed jet on-off valve. The sweep frequency experiment result of spool displacement demonstrates that the model of the valve can correctly reflect the dynamic characteristics of the valve in low frequency scope, but in high frequency scope, the effect of temperature and hysteresis should be considered.