Browsing by Author "Dsouza, R.D."

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Design, fabrication and testing of a 2 DOF compliant flexural microgripper
(Springer Verlag service@springer.de, 2018) Dsouza, R.D.; Karanth P, K.P.; Theodoridis, T.; Sharma, P.
This paper presents the development of a monolithic two degrees of freedom (2 DOF), piezoelectric actuated microgripper for the manipulation of micro-objects. Micromanipulation and microassembly are the major subjects of interest in recent times and are becoming increasingly important in many domains. An effort is being made to develop a novel 2 DOF microgripper, each jaw being able to move independently to grasp and rotate objects of micro sizes. Microgripper is developed based on the compliant mechanism. The designed 2 DOF compliant microgripper is modeled using FEM and PRBM approach further validated experimentally. The microgripper is actuated using APA 120-S piezoelectric stack actuators. The displacement of the microgripper and the gripping force is measured by image processing technique using LabVIEW tools. The microgripper is subjected to various tests to measure the displacement amplification ratio and micromanipulation experiments. Wire of various sizes are used to test the grasping and rotating sequence of the microgripper. The theoretical, simulation and experimental results reveal the good performance of the microgripper. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
Experimental investigation of amplified piezoelectric stack actuators 50XS, 60S and 120S for the actuation of microgrippers
(2017) Dsouza, R.D.; Karanth, P.N.
Amplified Piezoelectric Actuator (APA), is a mechanical amplified preloaded stack actuator increasingly popular in micro actuation. Subsequently, piezoelectric stack actuators have been utilized often in microgripping applications due to its large force and precise micro displacement. This paper presents the experimental testing and results of Amplified Piezoelectric Actuators (APA) APA 50SX, APA 60S and APA 120S which can be used for actuation of a 2-DOF compliant microgripper. In this work a static force measurement experimental arrangement has been setup to measure and get the graphical relationship of Force-Displacement-Voltage which can be used determine the input force to the microgripper at various displacement and voltage levels. The above three APA's are tested and APA 120S is found to be the most suitable option whose data is then validated on the microgripper experimental arrangement. An average deviation of 9.74% is observed from the real-time measured values and 10.33% deviation from the FEM results. The obtained values are in good correlation and the experimental test procedure provides the complete static data for the above actuators. � 2016 IEEE.
Experimental investigation of amplified piezoelectric stack actuators 50XS, 60S and 120S for the actuation of microgrippers
(Institute of Electrical and Electronics Engineers Inc., 2017) Dsouza, R.D.; Karanth P, P.
Amplified Piezoelectric Actuator (APA), is a mechanical amplified preloaded stack actuator increasingly popular in micro actuation. Subsequently, piezoelectric stack actuators have been utilized often in microgripping applications due to its large force and precise micro displacement. This paper presents the experimental testing and results of Amplified Piezoelectric Actuators (APA) APA 50SX, APA 60S and APA 120S which can be used for actuation of a 2-DOF compliant microgripper. In this work a static force measurement experimental arrangement has been setup to measure and get the graphical relationship of Force-Displacement-Voltage which can be used determine the input force to the microgripper at various displacement and voltage levels. The above three APA's are tested and APA 120S is found to be the most suitable option whose data is then validated on the microgripper experimental arrangement. An average deviation of 9.74% is observed from the real-time measured values and 10.33% deviation from the FEM results. The obtained values are in good correlation and the experimental test procedure provides the complete static data for the above actuators. Â© 2016 IEEE.