Structure Optimization And Dynamic Characteristics Analysis Of Micro Flow Control Valve

Micro flow control valve is an important part of micro hydraulic system flow control,its performance directly affects the stability,accuracy,reliability and other performance of the hydraulic system.Nowadays,with the miniaturization of many products,micro-flow control valves are needed in many working conditions.Because the internal situation of micro flow control valve is more complex,it has significant micro characteristics and uncertainty.Therefore,although some overall experimental data can be obtained through experimental research,the corresponding research cost and product development cycle will also be improved accordingly.Based on this situation,this paper attempts to solve the problem that the micro flow regulating valve is easy to stick and lead to valve failure,and the torque of the spool driving motor increases or cannot be driven completely by theoretical calculation and numerical simulation analysis,which provides theoretical guidance for the subsequent design and optimization of the micro flow regulating valve.Firstly,through the establishment of the three-dimensional model of the microflow control valve,understand the throttling mechanism of the micro-flow control valve,and then through the basic theory of fluid mechanics and the coupling field equation of Lagrange-Euler coordinate system,the fluid and solid characteristics of the micro-flow control valve are numerically simulated.The flow field under different pressure difference and different spool Angle was analyzed by using ANSYS Work Bench software,and the pressure and velocity changes in the valve were compared.It was concluded that the pressure impact near the valve port was large and there was negative pressure phenomenon.Therefore,the fluid-structure coupling analysis of valve sleeve and spool combination structure is also carried out.By comparing the deformation of different opening degrees under normal working conditions,it is found that there is stress concentration and large deformation at the valve port,which provides a basis for subsequent optimization.Secondly,the micro-flow control valve sleeve and spool combination structure of the valve port structure optimization,mathematical modeling and structural parameters calculation;Based on the triangular and U-shaped buffer slots of the valve port,the structure of the combined buffer slots is proposed and the optimum value range of the plane Angle and depth is obtained.In order to optimize the parameters of the plane Angle and depth of the combined buffer groove,the optimal structural parameters were designed and obtained by using the bird swarm algorithm,and the fluid-structure coupling simulation results were verified.Finally,the dynamic characteristics of the micro-flow regulating valve are analyzed according to the drive control unit of the valve spool.The simulation model of the micro-flow control valve is built in AMESim,and the co-simulation interface is created.Through the interface,the driving motor and controller are built in MATLAB/Simulink software.Through the analysis of the PID controller and fuzzy PID controller’s step signal,hydrodynamic change curve and outlet flow curve,it is concluded that changing the structure and optimizing the controller can effectively improve the dynamic characteristics of the system,which provides an improved method for the subsequent solution of excessive resistance moment.