Browsing by Author "Sushith K."

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    Damage Analysis of Tool-Based Micromachining Setup Using Electrical Continuity-Based Contact Detection System
    (2021) Veeresha R.K.; Muralidhara; Rao R.; Sushith K.; Shilpa 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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    Design, analysis and testing of flexurally amplified piezoactuator based active vibration isolation system for micromilling
    (2020) Divijesh P.; Muralidhara; 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 810μm and 780μm 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.