Browsing by Author "Sushith, S."

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    Damage Analysis of Tool-Based Micromachining Setup Using Electrical Continuity-Based Contact Detection System
    (Springer, 2021) Veeresha, R.K.; Rao, M.; Rao, R.; Sushith, S.; Karegoudra, M.K.
    Initial registration of tool with respect to workpiece is a critical requirement in tool-based micromachining setup. As the tool is in the order of few hundred micrometre diameter and rotating at very high speed, hence, the chance of tool breakage or workpiece surface damage during tool workpiece registration is more during micromachining. Initial tool registration of tool with respect to workpiece circuit was developed and incorporated with developed tool-based micromachining setup. The performance of the developed electrical continuity-based contact detection circuit was done by feeding the workpiece with different offset dimensions. From the experiments, it’s observed that there is more damage in workpiece when tool workpiece offset distance is more in both milling and drilling tools. © 2021, ASM International.
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    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.