Power requirements in velocity feedback control of a plate with an inertial actuator

Camperi, Stefano, Ghandchi-Tehrani, Maryam and Elliott, Stephen J. (2018) Power requirements in velocity feedback control of a plate with an inertial actuator. In 25th International Congress on Sound and Vibration 2018, ICSV 2018: Hiroshima Calling. vol. 2, International Institute of Acoustics and Vibration. pp. 723-730 .

Abstract

This paper presents an experimental and analytical study on the power balance of a local velocity feedback control system. Active damping is introduced to control the vibration of a plate using an inertial actuator. The changes in the power balance are investigated with respect to the velocity feedback gain. The power generated by an external disturbance is dissipated via the plate and the control unit. The plate vibration is minimised by tuning the feedback gain so that the power flow to the control unit is maximised. However, previous studies did not account for the electrical power required by the inertial actuator to operate. In this study, the reduction of kinetic energy of the plate is analysed with respect to the power required by the active control unit. A mobility/impedance model of the plate coupled with the inertial actuator is firstly presented in the frequency domain. The analysis is then extended to the control of a plate, in which an array of nine accelerometers is used to measure the global level of vibration of the structure. A digital model of the identified inertial actuator is implemented to obtain an online estimation of the power absorbed from the structure and the active power required by the control unit. The system provides a reduction of up to 5 dB, when subject to broadband excitation.

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Contributors

Author: Stefano Camperi

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