Improving surface roughness in turning using optimal control of tool's radial position

Development of a practical model for selection of stable tooling system configurations in internal turning

“…Chatter detection is based on the application of single or multisensor systems installed on the machine tool and on the development of special algorithms for in-process chatter identification [4,5]. Vibration reduction or chatter suppression strategies aim at increasing the dynamic stiffness of the machining system (defined as the product of equivalent stiffness k and damping x) or changing its main natural frequency by using passive dampers [6][7][8][9] or feedback-controlled actuators [10][11][12].…”

Suppressing vibrations of machining processes in both feed and radial directions using an optimal control strategy: The case of interrupted cutting

“…The forces have three components namely, an impulse and a saw tooth components resulting form vibration of the tool after being subject to the impact (both at the spindle rotational frequency), in addition to a random part resulting form the stochastic nature of the cutting process. Machine tool vibrations acting at the base of the cutter (Z r andZ f ) each has three modes of vibration at 50, 165, and 300 Hz with accelerations of 10, 30, and 50 m/s 2 , respectively, as reported in [15].…”

“…The work presented in the present study extends the control techniques of El-Sinawi and Kashani [12] to include controlling cutting tool's position in two orthogonal directions (both radial and feed). The techniques will be applied to a cutting tool subjected to cutting force characteristics generated from interrupted cutting conditions.…”

“…He showed that the proper choice of the Kalman gains could drive the states of the structure at the sensor location to zero. In another study, El-Sinawi and Kashani [12] presented optimal control techniques for improving textures of machined surfaces by controlling cutting tool's position in the radial position.…”

The use of active materials for machining processes: A review

“…El-Sinawi and Kashani [123] designed an active tool holder utilizing a Tefenol-D actuator. A Kalman estimator-based feed forward control scheme was employed to suppress the vibration of the tool.…”