Dr. Carlos Frajuca

Sao Paulo Federal Institute, Brazil


Talk Title
Optimization of flywheel rotor geometry
Talk Abstract

This talk presents a specific mechanical device known as Flywheel, capable of storing kinetic energy due its high rotational speed. This device is also known as electromechanical battery.  Compared to other commercial batteries, batteries containing Flywheels have longer lifetime, are less potentially damaging to the environment and are have high power output. The aim here is to analyse the behaviour of flywheels rotating at the highest possible tangential speed, thus concentrating more energy, with changes in the flywheel geometry with the objective to minimize material costs, as the material to be used in their construction in the future, CarbonNanoTubes for instance, is a very expensive material. The commercial software SolidWorks was used for geometry analysis of the flywheel rotor to obtain the von Mises stress under rotation. Based on the model suggested previously the Finite Element Method was used to create and simulate inertial flywheel models with different geometries. These models gradually incorporated successive geometry changes for the increase of tangential speed. After seeking an initial dimension through the research of the rotor geometry. The material chosen for the simulations was a commercial carbon fiber. The material used presents characteristics that can support the high stress to which the rotor is subjected. The analysis indicated a geometry that allows the best performance for the development of a flywheel with the lowest cost and high yield showing a very homogeneous distribution of the von Mises stress all over the flywheel structure. 

Flywheel, rotor geometry, finite element methods
Short Biography

Graduate in Mechanics at São Carlos Federal University (1986), Graduate in Physics at Sao Paulo University (1987), master's in Sciences at Sao Paulo University (1992) and Ph.D. in Sciences at São Paulo University de São Paulo (1996). Areas of Expertise 1. Electromechanical Instrumentation 2. Relativity and Gravitation 3. Particles and Fields 4. Vocational Education. Has experience in Electric Engineering, focusing on Electromechanical Instrumentation, acting mainly in gravitational waves detectors. Main Management and Admnistrative Positions: Institution Brasilia Federal Institute: 08/2009 - 02/2010 PosGraduation and Research Pro-Rector; 03/2009 - 07/2009 UnderGraduation Pro-Rector 03/2009 and 02/2010 Substitute Rector. Currently in a position of Full-Professor at Sao Paulo Federal Institute, with a fellwship in research in Mechanics, Naval, Oceanics and Airspace Engineering from the National Council for Research. Referee for the Classical and Quantum Gravity and Journal of Physics:Conference Series. Member of the editorial board of the journals: Journal of Gravity and Sinergia (ISSN: 2177-451X) and editor of the Sinergia for two years.My score in the researchgate (36.71) is higher than 95% of ResearchGate members

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