Browsing by Author "Roopa, R."

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Design, fabrication and experimental studies of compliant flexure diaphragm for micro pump
(Science Publishing Corporation Inc ijet@sciencepubco.com, 2018) Roopa, R.; Karanth P, P.; Kulkarni, S.M.
This study reports the performance of piezo actuated compliant flexure diaphragm for micropump and MEMS application. To achieve the high performance of diaphragm at the low operating voltage compliant flexure diaphragm design is introduced. Very limited work has done on the diaphragms of micropump. Large numbers of mechanical micropumps have used plane diaphragms. The central deflection of diaphragm plays an important role in defining the micropump performance. The flow rate of mechanical type micropump strongly depends on the central deflection of diaphragm. In this paper compliant flexure diaphragms are designed for micropump to achieve higher deflection at lower operating voltage. Finite element analysis of compliant flexure diaphragm with single layer PVDF (Polyvinylidene fluoride) actuator is simulated in COMSOL. Compliant flexure diaphragms with a different number of flexures are analyzed. The central deflection of compliant flexure diaphragms is measured for driving voltages of 90V to 140V in 10 steps. The deflection of the compliant flexure diaphragm mainly depends on flexure width and length, the number of flexures in the diaphragm, PVDF thickness, diaphragm thickness and driving voltage. Use of compliant flexure diaphragm for micropump will reduce the mass and driving voltage of micropump. An attempt is made to compare the results of compliant flexure diaphragms with plane diaphragms. From the experimental results it is noticed that the compliant flexure diaphragm deflection is twice that of the plane diaphragm at same driving voltage. Deflection of three flexure and four flexure compliant diaphragms is 10.5?m and 11.5?m respectively at 140V. © 2018 Authors.
Effect of flexure beam geometry and material on the displacement of piezo actuated diaphragm for micropump
(2018) Roopa, R.; Navin, Karanth, 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 6.75?m for stainless steel, 10.89 for beryllium copper and 12.10?m 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.
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 6.75Î¼m for stainless steel, 10.89 for beryllium copper and 12.10Î¼m 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. Â© Published under licence by IOP Publishing Ltd.
Effect of flexure hinge geometry on central deflection of piezo actuated diaphragm for micropump
(2018) Roopa, R.; Karanth, P.N.; 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. 9.35?m. 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 8.65?m which is 64% more compared to plane diaphragm. � 2017 IEEE.
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. 9.35Î¼m. 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 8.65Î¼m which is 64% more compared to plane diaphragm. Â© 2017 IEEE.
Modeling of compliant flexure diaphragm for micropump
(2018) Roopa, R.; Navin, Karanth, P.; Kulkarni, S.M.
A number of mechanical micropumps have been proposed, many of those have been designed using plane diaphragms. Diaphragm is the essential part in mechanical type of micropump. Performance of the diaphragm can be improved by varying diaphragm geometry; use of compliant flexure in the diaphragm will improve the diaphragm deflection. In this paper, we present a FE analysis of stainless steel flexure diaphragm with different number of rectangular flexures using ANSYS. Simulations have been performed and results obtained for different flexure diaphragm from the Finite element modeling (FEM) compared with the plane diaphragm to decide the better diaphragm for piezoelectric mechanical type micropump. The central deflection is studied for driving voltage of 90-120V. Single layer PVDF actuator of 52?m thickness is considered for simulation. The great advantage of using compliant flexure in micropump diaphragm is that it can achieve higher deflection at a low driving voltage. � 2018 The Authors. Published by Elsevier Ltd.
Modeling of compliant flexure diaphragm for micropump
(Elsevier B.V., 2018) Roopa, R.; Karanth P, P.; Kulkarni, S.M.
A number of mechanical micropumps have been proposed, many of those have been designed using plane diaphragms. Diaphragm is the essential part in mechanical type of micropump. Performance of the diaphragm can be improved by varying diaphragm geometry; use of compliant flexure in the diaphragm will improve the diaphragm deflection. In this paper, we present a FE analysis of stainless steel flexure diaphragm with different number of rectangular flexures using ANSYS. Simulations have been performed and results obtained for different flexure diaphragm from the Finite element modeling (FEM) compared with the plane diaphragm to decide the better diaphragm for piezoelectric mechanical type micropump. The central deflection is studied for driving voltage of 90-120V. Single layer PVDF actuator of 52Î¼m thickness is considered for simulation. The great advantage of using compliant flexure in micropump diaphragm is that it can achieve higher deflection at a low driving voltage. Â© 2018 The Authors. Published by Elsevier Ltd.