Suppression of Boring Bar Vibration Using Adaptive Fuzzy Logic Control

In order to overcome the self-excited vibrations in internal turning (chatter) a new design for boring bar was introduced, which depends on using the workpiece in supporting the boring bar using intermediate rolling elements. The system bears the loads under the action of a hydraulic pressure, which at a certain value prove to have a significant effect on the system chatter tendency.In the present paper, a gear pump driven by a DC motor system is designed to control the pressure of the supporting hydraulic system. The pump-motor system model was created in MATLAB/ SIMULINK simulation and then a fuzzy logic control system (FLC) is designed to control the pressurized oil for keeping it less or equal to 4 bars to save the self-excited vibrations within the desired limits.