Browsing by Author "Karanth, P.N."

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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.
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.
Modeling of cantilever type piezoelectric polymer actuator
(2018) Aparna; Karanth, P.N.; 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.
Predictive Intelligent System Development for Disease Classification in Diagnostic Applications
(Springer Science and Business Media Deutschland GmbH, 2024) Shrivathsa, T.V.; Rao, S.S.; Karanth, P.N.; Adiga, K.; Mahabala, M.; Dakappa, P.H.; Prasad, K.
With ever increasing explosion in information domain and demand for highest accuracy in medical diagnosis, the existence of a reliable, accurate prediction system is the need of the hour. In this work, an effective prediction system has been developed for accurate classification of undifferentiated ailments using a unique approach. Prediction of undifferentiated diseases at an early stage always helps in better diagnosis. Illnesses like tuberculosis, non-tubercular bacterial infection, dengue fever, non-infectious diseases have regular manifestation of fever. In present work, the uniqueness lies in the use of only temperature data of the patient being referred in predicting the nature of fever, with highest degree of accuracy, instead of several self-defined parameters over limited interval of time. The system has been developed based on artificial intelligent technique, and optimization has been achieved by assessing the performance of different classifiers available. Using prediction model with classifiers, decision can take over comparative results between different classifier algorithms. A result of predictive system defines the combination of good classifier and system developed. Accuracy score and other salient parameters describe the complete picture of the system. Predictive model development in this work proved to be one of the best assistant tools to a doctor to take call over the disease crucial period. Â© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.