Research On Active Vibration Suppression Method Of Machine Tool Feed System Based On Magnet Orheological Fluid Damper

As the demand for high-precision products continues to increase,the processing performance and stability of manufacturing equipment have attracted wide attention.Among them,the vibration generated by the machine tool not only affects its dynamic performance and the quality of the processed parts,but also reduces the production efficiency and The durability of the tool,when the vibration is severe,will cause the performance of the machine tool to decline,and the noise caused by the vibration will endanger the health of the operator.Suppressing the adverse effects of machine tool vibration is of great significance to the development of high-precision machine tools.The magnetorheological fluid damping device can suppress the vibration by improving the damping characteristics of the system.Whether the precise control of the damping force directly affects the damping effect of the mechanical structure.Aiming at the problem of vibration suppression in the feed direction of the machine tool,thesis proposes a method to study the damping force characteristics of the magnetorheological fluid damper by means of simulation analysis.The magnetorheological fluid damper is applied to the machine tool feed direction to study its Damping effect.The main research contents of thesis are as follows:(1)Design of the overall structure of the magnetorheological fluid damper.A new type of double-rod damper is designed,and the structure of damping channel,cylinder,piston rod and so on are determined.In the case of zero magnetic field,the mathematical model of the damping force of the magnetorheological fluid damper is established based on the N-S equation.Using the Bingham model,the mathematical model of the damping force of the magnetorheological fluid damper under the magnetic field is derived,and the structural parameters of the damping channel and the magnetic field acting device are optimized according to the requirements of the damping force;The internal coil magnetic induction and calorific value are calculated.(2)From the perspective of optimizing the structure design of the magnetorheological fluid damper,the influence rule of the structure parameter of the magnetorheological fluid damper on the magnetic induction intensity is studied;based on the Maxwell equations,the ANSYS software is used to simulate the magnetorheological fluid damper The distribution of the magnetic field under the action of the Coulomb electric field and induced electric field explores the variation of the magnetic induction intensity with the current at the damping channel,and analyzes the influence of different structural parameters on the magnetic induction intensity.Based on the governing equations of fluid mechanics,the change law of damping force under the action of magnetic field was obtained by numerical calculation using Fluent finite element fluid simulation software.(3)Test and study the characteristics of the magnetorheological fluid damper and the application of vibration reduction in the machine tool feed system.Through the characteristic test of magnetorheological fluid damper,the relationship between current-velocity-damping force of magnetorheological fluid damper was established by using polynomial and BP neural network.The results show that the current and the damping force show obvious nonlinear characteristics,and the variation law of the damping stiffness under different currents is analyzed.The dynamic model of the machine tool feed system based on the magnetorheological fluid damper was established,which laid the foundation for the subsequent vibration damping control research.Through the machine tool feed system vibration damping test bed,the damping force caused by the damper under different currents was explored The impact of changes on the damping effect.