超磁致伸缩致动器式脉冲喷射开关阀性能研究

Performance of Pulsed Jet On-off Valve Based on Giant Magnetostrictive Actuator

鉴于超磁致伸缩致动器(GMA)的脉冲喷射开关阀性能受致动器结构参数的影响,建立了基于GMA的脉冲喷射开关阀流量与驱动电流之间的物理模型,并采用Matlab进行系统仿真。对比分析了开关阀中不同驱动线圈匝数、涡流时间常数、等效质量对开关阀频响伯德图和时域阶跃响应的影响,从而得到不同参数引起的开关阀工作带宽、响应时间等性能的变化规律,试验表明致动器结构引起的涡流时间常数是影响开关阀工作性能的主要因素,通过减小线圈匝数、缩短涡流时间常数可扩大致动器的频响范围,缩短响应时间。

The performances of pulsed jet on-off valve based on giant magnetostrictive actuator（GMA） are affected by structure parameters of actuator. The physical model between flux and driving current of the valve was built,and their relationship was simulated by Matlab. The response of different parameters,such as number of solenoids,eddy current time constant,effective mass of actuator,effect on the valve flux in frequency domain and time domain were analyzed respectively. The trends of flux with actuator parameters were abstracted from the simulation results. The eddy current time constant was the main factor which confirmed by experiments. To enlarge the response frequency band and shorten the response time,the number of the solenoid and the eddy current time constant should be decreased.