Browsing by Author "Karanth P, P."

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A Development of Micropump Based on Cooling System for Laptops
(Springer Science and Business Media Deutschland GmbH, 2024) Patil, S.S.; Mohith, S.; Karanth P, P.; Kulkarni, S.M.
This paper aims to study a new mechanical diaphragm micropump for a liquid cooling system for laptops. A low weight, high discharge diaphragm pump has been developed successfully to pump the coolant by the crank and extended rocker mechanism using a micro gear dc motor. The bossed diaphragm pump chamber and mechanism are fabricated using high-quality PLA with optimized parameters and the FDM 3D printing method. Both valves and diaphragm are created using silicon rubber. The reciprocating action of the mechanism develops the suction and discharge stages that make the pump work. The pumpâ€™s performance is analyzed using an experimental setup that has been developed and implemented. The diaphragm design, pump chamber, operating voltage, and coolant type all affect the performance of a bossed diaphragm pump driven by a crank and extended rocker mechanism. The measured maximum flow rate of the designed prototype is 94Â mL/min for water and 65Â mL/min for ethylene glycol solution within 5Â V actuation voltage and zero pressure head. Â© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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.
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.
Experimental study on linear displacement measurement sensor using RGB color variation technique with PID controller
(Institute of Electrical and Electronics Engineers Inc., 2017) Murthy, A.; Rao, S.S.; Herbert, M.A.; Karanth P, P.
This study is based on experimental approach to linear displacement measurement using RGB color coding algorithm. This system is based on the auto-calibration procedure which can be implemented in a circuit, based on the temporal changes in the intensity of light, with the help of a light dependent resistor (LDR). The system consists of two LDRs and an LED placed on one side and an RGB color coded reflective paper on the opposite side. PIC microcontroller is used for powering the LED, processing of data for feedback control and to display the output on an LCD. LDR1 reading is used for displaying the relative linear distance, by mapping the voltage as a function of distance. This reading is used as a feedback to a PID controller to correct for the deviation in the measurement. Extensive experimental observations are conducted to analyze the reliability of the results in accordance to the wavelength of light reflected, the signal voltage and power output of the system. Investigation of the optimum positioning of the LED and the reflective RGB color coded paper is performed by repeatability analysis and hysteresis effects. Furthermore, the efficiency of the system is increased by implementing a PID controller upon investigating the different controller design, viz. P, PI and PID. A high resolution of 0.1 [mm] is obtained for such a simple and economical system, thereby making it highly efficient, in both minute measurements as well as over the entire bandwidth range of the visible light spectrum. Â© 2017 IEEE.
Intelligent charging system for dedicated applications using lithium ion battery
(Institute of Electrical and Electronics Engineers Inc., 2017) Sivaranjani, J.; Sandeep, B.; Olety, V.R.; Karanth P, P.
In devices where rechargeable batteries are used, it is useful to have an estimate of the time taken to complete charging of the battery. It is a non-trivial activity to estimate this time, because this is affected by many factors such as the State of Charge (SOC), State of Health (SOH), temperature and operating conditions of the battery. This is the reason, even in mobile phones, only the percentage charged of the battery is mentioned by the Original Equipment Manufacturers but not the time required to complete the charging. This percentage is usually based on SOC algorithms which are approximate estimate and as the battery ages, this indication is less accurate. This paper focuses on the approach to estimate the charging time of lithium ion battery in accordance with the health of the battery. In this work, the charging time and the capacity of a lithium ion battery over its entire life is recorded into a database. Using this database, the charging profiles and capacity of the battery are modeled as equations. These equations are used for the calculation of charging time of any similar battery at any SOH. The algorithm designed can also be used to warn the consumers about the battery aging details of their device by the calculation of SOH of the battery. This algorithm is formulated based on 32.4V 3Ah lithium ion battery and verified for the same. Â© 2016 IEEE.
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.