A dynamic modelling method for an electro-hydraulic proportional valve combining multi-systems and moving meshes

The moving mesh method of computational fluid dynamics (CFD) in COMSOL Multiphysics is utilized to obtain transient characteristics of the flow force associated with displacements, velocities and pressures. Secondly, a dynamic finite element model (FEM) of the electromagnetic subsystem is also established by the moving mesh. Thirdly, the transient force of the fluid subsystem and the spring force of the mechanical subsystem will be loaded on the valve spool, and the control voltage characterized as an analytic equation is associated with the electromagnetic coil. As a result, a coupling FEM of this valve combining the dynamic data of fluid system, a dynamic FEM of the electromagnetic system and mathematical models could be achieved. Finally, dynamic characteristics of the valve can be directly extracted from computing results in this software. Reflected through the fast response time, displacement, velocity and flow rate, dynamic behaviors of a miniature valve have been simulated effectively through such a coupled method.