Faculty Publications
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Item Design, analysis and testing of flexurally amplified piezoactuator based active vibration isolation system for micromilling(Bangladesh University of Engineering and Technology, 2020) Divijesh, P.; Rao, M.; Rao, R.; Ahmed, R.M.; Sushith, K.Vibration is considered to be one of the limiting factors which affects precise measurements and surface finish of various mechanical components. Active Vibration Isolation is one such effective method which reduces the unwanted vibrations in any mechanical systems in a wide range of frequencies. This paper presents the design, analysis and testing of an active vibration isolation system based on Flexurally Amplified Piezo actuators (FAP1 and FAP2). The proposed set up aims at obtaining 180° out of phase displacement signal to the generated displacement signal using FAPs thereby minimising vibrations at the isolation platform. The maximum displacements of FAP1 and FAP2 obtained for 0-150V sinusoidal peak to peak amplitude at 1Hz frequency was found to be 810?m and 780?m respectively. The experimental displacements obtained were compared with simulated displacements using Forward Bouc-Wen hysteresis model and found very well agreed with each other within 1% error. An attempt has been made to estimate the voltage required for obtaining any desired displacement of FAPs using Inverse Bouc-Wen model through Simulink. The experimental displacements for the corresponding estimated voltages were obtained for FAPs. Finally, the proposed set up was tested by actuating both FAP1 and FAP2 separately and simultaneously for 0-150V at 1Hz frequency and was found that the displacements obtained were 180° out of phase thereby minimizing vibrations at the isolation platform. © 2020 Zibeline International Publishing Sdn. Bhd.. All rights reserved.Item Experimental investigations on flexurally amplified piezoactuator based active vibration isolation system using PID controller(Acta Press, 2021) Divijesh, P.D.; Rao, M.; Rao, R.; Sushith, S.; Ahmed, R.M.This paper presents the development and implementation of a closed loop proportional integral derivative (PID) control system on a flexurally amplified piezoactuator-based active vibration isolation setup. The vibration isolation system is designed to control the vibrations of work piece during micromilling. The proposed setup uses two flexurally amplified piezoactuators (FAPs) where FAP1 is used to generate the vibrations and FAP2 is used to nullify the vibrations generated by FAP1. Flexural amplifiers are used to amplify the displacement of piezostack actuators. The nonlinear hysteresis behaviour of FAPs is identified using experimental voltage displacement plots and is modelled using Forward Bouc-Wen hysteresis model. The voltage to be applied for hysteresis compensation of FAPs is estimated using Inverse Bouc-Wen model. The linear inverse model of FAP2 is identified using its known parameters and is implemented in the proposed closed loop control system to estimate the control voltage to be supplied to FAP2 corresponding to control displacement obtained by tuning PID gains for nullifying the vibrations generated due to FAP1. Active vibration isolation experiments are carried out using dSPACE for 200 µm vibration amplitude at 1 Hz frequency, and percentage error in vibration isolation is estimated. © 2021 Acta Press. All rights reserved.