Theory Research And Simulate Of Restrain Lathe's Tool Post Vibration In MR Damper

As one of the most important factors which influenced the machining quality, machine cutting chatter has aroused extensive concern. In the dissertation, via compare diversified vibration reduction methods, and the MR fluid is applied to the chatter suppression. Because the Magnetorheological fluid damper has advantages of compactness, low power requirements, wide dynamic ranges and fast reaction. It is a typical controllable fluid damper. It is suitable for vibration control and has development trend of displace traditional vibration reduction damper. Semi-active control is often used in vibration reduction, there are some advantages in semi-active control, without energy source, easy going, etc. Semi-active vibration reduction control is effect by changing input electric current or the damp coefficient of lathe's tool post vibration reduction system.Then, theoretical analysis of lathe's tool post vibration reduction based on the application of MR material in vibration, and physical modeling of MR fluid damper have been made in the article. MR dynamic model is obtained by using the amendatory Bingham model, the design parameter of damper and analyse relation curve of displacement with damp force and speed with damp force, prove the validity of the model, at the same time, provide exact model for design lathe's tool post vibration reduction fuzzy control system.Finally, based on research object of lathe's tool post system, built the mathematics model of restrain lathe's tool post vibration in MR fluid damper. The fundamental theory of the fuzzy control is introduced in the article. And the design and implementation method of the fuzzy controller are also discussed and researched. Based on fuzzy control method, and simulated by MATLAB and Simulink software. The fuzzy control rules are listed and the fuzzy controller is designed. Simulated by Simulink, the lathe's tool post vibration reduction result compared passive control with semi-active control based on fuzzy control are presented. It is indicated that semi-active vibration reduction based on fuzzy control has an advantage in restrain lathe's tool post vibration and prove fuzzy control takes an effective performance in lathe's tool post vibration reduction system.