The grounds of the high-speed switching valve and piston cylinder high-speed electro-hydraulic actuators to establish the mathematical model, the numerical simulation analysis time delay characteristics of the high-speed electro-hydraulic actuators. According to the analysis results at the same time proposed to reduce the time delay of the high-speed electro-hydraulic actuators, speed up structural optimization of the operating characteristics of high-speed electro-hydraulic actuators.
The high-speed electro-hydraulic actuators are generally composed by two three-way high-speed switching valves and hydraulic cylinders, its working principle is shown in Figure 1. In the absence of electrical signal, the speed switch valve in normally closed position, the control chamber of the hydraulic cylinder is connected to the valve with the tank via a high-speed switch, the hydraulic cylinder under load spring push back in situ in a drive signal, high speed switching valve open position, the control chamber of the hydraulic cylinder via a high-speed switching valve and the hydraulic pressure source is connected, to thereby drive the hydraulic cylinder forward high response. As can be seen from the working principle, the high-speed electro-hydraulic actuators in two different working mechanism to promote and rollback. Through theoretical analysis and numerical simulation studies and experimental validation of the method, the delay characteristics of the electro-hydraulic actuator driven and action fallback.
Mathematical model of a high-speed electro-hydraulic actuators
1.1 promote the mathematical model of the stroke
Speed switch valve response much faster than the speed of dynamic response of the electro-hydraulic actuator, to promote high-speed switching valve port trip simplified a fixative resistance, high-speed electro-hydraulic actuators working condition can be simplified as Figure II The model shown.
