Research on Electro-Hydraulic Load Simulator Based on Building Model of Flow Press Servo Valve

Abstract

The model of flow press servo valve is built in this paper, during building the model, the author emphatically analyses the flow equation and force (torque) balance equation of every part of the valve, at the same time, all levels sub-models are organic combined according to power flow direction, signal flow direction of elements and causality, then we get the bond graph model of the flow press servo from this way. Adapting flow press servo valve and flow servo valve to concurrently control load system has its great advantage in restraining the superfluous force of the electro-hydraulic load simulator system, the performance such as load precision of system is enhanced greatly according to this method. Based on the system bond graph model, and by comparing the simulation curves and experiment curves, we can know that the simulation curves basically tally with the experiment curves, the bond graph models are validated right, which are flow press servo valve bond graph model and double valves concurrently control the electro-hydraulic load simulator system bond graph model. Simultaneity, the bond graph models in this paper take on generality, they are can be used on other aspects, such as other valve controlling cylinder system simulation, design and control strategy theory research.

Design and testing of a cost-effective active force sensor with servo control

“…13. As the system approaches a steady state, the magnitude of the oscillations decreases with time, as in some other studies [12,24,[19][20][21][22][23][24][25][26][27][28][29][30][31][32]. It is observed that the system reaches the equilibrium position more quickly at higher frequencies.…”

Compound Velocity Synchronizing Control Strategy for Electro-Hydraulic Load Simulator and Its Engineering Application

“…This solution is easy to apply, but its ability to suppress motion disturbances is usually limited. (2) Mechanical structure compensation Its purpose is to employ an auxiliary device to eliminate motion disturbances [2,3], such as an interconnected hole of a hydraulic motor, oil container, buffer spring adjustments, "double-valve scheme," and "double-motor scheme" that keeps the EHLS synchronization with actuators. Overall, this kind of method is more costly and complex.…”