Conference Papers
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Item Effect of flexure beam geometry and material on the displacement of piezo actuated diaphragm for micropump(Institute of Physics Publishing helen.craven@iop.org, 2018) Roopa, R.; Karanth P, K.P.; Kulkarni, S.M.In this paper, we present a COMSOL analysis of flexure diaphragm for piezo actuated valveless micropump. Diaphragms play an important role in micropumps, till now plane diaphragms are commonly used in micropumps. Use of compliant flexure hinges in diaphragm and other MEMS application is one of the new approach to achieving high deflection in diaphragm at low operating voltage. Flexures hinges in diaphragm acts as simply supported beam. Out-off plane compliance value and stiffness is considered for the selection of proper flexure for diaphragm. Diaphragm material also plays an important role in the diaphragm central deflection. Factor considered for diaphragm material selection is resilience; it is the ratio of yield stress to static modulus. Higher is the resilience will leads to higher deflection generated, it also imparts good compliance. Based on the resilience beryllium copper, stainless steel and brass materials are selected for diaphragm analysis. Simulations have been performed using COMSOL multiphysics. This study reports the effect of flexure hinge geometry and diaphragm material on the central deflection of diaphragms and compared with existing plane diaphragm. Simulation results illustrates that the deflection of three flexure diaphragm with 2mm width and 2mm length flexure is 6.75μm for stainless steel, 10.89 for beryllium copper and 12.10μm for brass, at 140V which is approximately twice that of plane diaphragm deflection. The maximum in both plane and three flexure diaphragm deflection is obtained for brass diaphragm compared to stainless steel and beryllium copper. © Published under licence by IOP Publishing Ltd.Item Modeling of cantilever type piezoelectric polymer actuator(Institute of Electrical and Electronics Engineers Inc., 2018) Aparna; Karanth P, K.P.; Kulkarni, S.M.Among the various types of actuators available, piezoelectric materials are very promising on account of its miniaturization which results in making the products more compact and light. These materials are capable of producing large forces and precise displacement at higher efficiency and exhibit a linear property. This work mainly emphasizes on the behavior of the cantilever beam when piezoelectric actuation is carried out using PVDF layers. Piezoelectric actuators directly use the electric field induced strain which is derived from piezoelectric coefficients d31, d33. A design concept for bi-layered piezoelectric actuation using the d31 mode using PVDF as the material is emphasized here. The maximum tip deflection of the cantilever beam is studied for driving voltages of 90-140 V in the steps of 10V for three different thicknesses where the stacking of 2 layers is carried out in 4 actuation configurations namely PESP, PERP, SESP, SERP. The results obtained for bi-layer actuator is compared with single layer and the equivalent single layer thick actuator. All this is achieved by creating a finite element model for the cantilever beam in a FEM tool. The modelling is done in a real time scenario where the gluing layer, packaging layers, copper electrodes, Silver Ink are also considered to do a realistic analysis. © 2018 IEEE.Item Effect of flexure hinge geometry on central deflection of piezo actuated diaphragm for micropump(Institute of Electrical and Electronics Engineers Inc., 2018) Roopa, R.; Karanth P, K.P.; Kulkarni, S.M.This paper discusses the effect of flexure hinge geometry on piezo actuated diaphragms for the micropump application. Use of flexure hinges in the diaphragm is one of the approaches to increase the diaphragm central deflection, selection of proper flexure hinges for out-of-plane application is important. COMSOL analysis is used to study the effect of flexure hinge geometry on the central deflection and stress distribution in the diaphragm. Rectangle hinge, circular cut-out hinge and corner fillet flexure hinges were chosen with a constant width of 1.5mm and 2mm length. In the present investigation, the central deflection of the diaphragm with different flexure hinges are studied and compared with a plane diaphragm with respect to actuating voltage. The simulation result shows that the maximum deflection is obtained from circular cut-out flexure diaphragm i.e. 9.35μm. Whereas stress distribution in circular flexure hinge diaphragm is more compared to rectangular flexure hinge diaphragm, which may lead to failure. Therefore rectangular flexure diaphragm has the advantage of minimum stress concentration with higher deflection compared to corner fillet and circular flexure. The deflection of rectangle flexure hinge diaphragm is 8.65μm which is 64% more compared to plane diaphragm. © 2017 IEEE.Item Design and Fabrication of a Test Rig for Performance Analysis of a Pneumatic Muscle Actuator(Springer Science and Business Media Deutschland GmbH, 2021) Yashas, M.; do Rosario Carvalho, A.D.; Karanth P, K.P.; Desai, V.Artificial pneumatic muscle actuator (PMA) is used to convert pneumatic power to mechanical force. These actuators are like biological muscles, hence its name. PMAs have a wide range of applications ranging from robotics, industrial to the medical applications, as a result of its high power-to-weight ratio, nonhazardous, and compliant nature. The PMA, like any other actuator, has to be tested and validated before using it in any real-world application. An experimental procedure is set up to allow the designer to predict, analyze, and optimize PMA performance before its use in sensitive applications. To achieve this, a rigid experimental test rig needs to be designed to test properties of PMA such as displacement, force, and load capacity. Result of the experiment conducted on the standard PMA by using developed test rig has 5% variation with the values of the manufacturer’s datasheet. © 2021, Springer Nature Singapore Pte Ltd.