Vibration Analysis and Active Control of Test Sample Suspended in Electrostatic Levitation Field

The torsional characteristics and the suspension control of test sample in the electrostatic levitation field are investigated in this article. Firstly, the model of coulombic force generated by the high voltage electrode is established, and the electric image force in electrostatic levitation field is detailly established. Furthermore, the suspension characteristics of test sample in vertical and horizontal axes are studied, and torsional characteristics of test sample around horizontal axes are investigated. Moreover, the control model of test sample in the electrostatic levitation field is designed to control the torsional vibration. The numerical simulations about force characteristics of electrostatic levitation field are developed, and the voltage-force coefficient of coulombic force is obtained. Finally, the experiments are conducted to analyze the suspension and torsion characteristics of test sample with coulombic force and electric image force, and the suspension and torsional stability of test sample are affected by the control voltage and the displacement deflection, and the tunable coulombic force could push the test sample back to the equilibrium position.