The Experts below are selected from a list of 18 Experts worldwide ranked by ideXlab platform

Valencia Alfaro Nerea - One of the best experts on this subject based on the ideXlab platform.

  • Diseño de rodillo universal para bicicletas con sistema de recuperación de energía
    2017
    Co-Authors: Valencia Alfaro Nerea
    Abstract:

    El propósito de este Trabajo de Fin de Grado es el diseño de un rodillo de entrenamiento para bicicleta de uso universal. Este dispositivo podrá utilizarse en diferentes aplicaciones como el entrenamiento de competición, la práctica doméstica deportiva o la realización de pruebas médicas. Este dispositivo tendrá un subsistema mecánico capaz de soportar el peso de la bicicleta y el/la deportista, así como para transmitir el movimiento a un sistema de recuperación de energía. Además tendrá una Componente electromecánica para transformar la energía mecánica en eléctrica. Finalmente, dispondrá de un circuito eléctrico para suministrar esta energía eléctrica para la carga de dispositivos electrónicos. Como característica adicional de interés práctico, el sistema completo será plegable para facilitar su almacenajeThe main purpose of the present paper is to provide the design of a bicycle training roller for universal use. The aforementioned device could be used in diverse applications such as competition training, domestic sport practice or medical testing. The device will have a mechanical subsystem capable of supporting the weight of the bicycle and the athlete, as well as to transmit the movement to an energy recovering system. Moreover, it will also include an Electromechanical Component in order to transform mechanical energy into electrical energy. Finally, it will have an electrical circuit to supply the electric energy with the purpose of charging electronic devicesGraduado o Graduada en Ingeniería en Diseño Mecánico por la Universidad Pública de NavarraDiseinu Mekanikoko Ingeniaritzan Graduatua Nafarroako Unibertsitate Publikoa

Danny W Muse - One of the best experts on this subject based on the ideXlab platform.

Pugal Deivid - One of the best experts on this subject based on the ideXlab platform.

  • Physics Based Model of Ionic Polymer-Metal Composite Electromechanical and Mechanoelectrical Transduction
    2018
    Co-Authors: Pugal Deivid
    Abstract:

    Ionic polymer-metal composite (IPMC) materials have been studied for the past two decades. Both Electromechanical and mechanoelectrical transduction have been reported and also quantitatively described by employing various modeling techniques. In this dissertation, a fundamental physics based model of IPMC that describes the phenomena is proposed. The same underlying equations and boundary conditions are used to calculate both voltage induced actuation and deformation induced voltage. Additionally, several more sophisticated modeling features are considered.The model incorporates conductive electrodes of IPMC - the ionic current, volumetric strain induced charge, and the electric current in the electrodes are coupled by the same set of equations and boundary conditions. While the underlying physics is the same, the electrode effect on the Electromechanical and mechanoelectrical transduction is different - actuation dynamics is affected by potential gradients in the electrodes, whereas in case of the mechanoelectrical transduction, the electrodes dissipate induced voltage. The Electromechanical Component of the model includes mathematical formulation to describe the electrolysis current and its effect on actuation. Additionally, a new charge-force coupling is proposed in order to accurately calculate deformation in case of different IPMC geometries. The mechanoelectrical Component of the model is parametrically analyzed to determine the underlying cause for the delay between induced voltage and applied deformation. It is shown that the volumetric effect of the anion charge is relevant in the mechanoelectrical transduction calculations. Experimental validation of the model is provided - three different IPMC thicknesses were used in order to ensure that the model is geometrically scalable.Fractal electrode geometry is proposed to mathematically describe the large surface area of IPMC's electrodes. Most physics-based models use very high dielectric permittivity value and adjusted diffusion constant in order to match the experimental data. While this approach allows matching the calculated and experimentally measured values, the geometric effect of the electrodes is not explicitly captured. It is shown that using the fractal geometry electrodes in calculations helps to gain insight into the electrode structure effect on both Electromechanical and mechanoelectrical transduction. For instance, simulations with fractal electrodes indicate that total transported charge and thus deformation are considerably affected by the surface area. Additionally, more realistic physical constants can be used in calculations.To make the model of IPMC more applicable in system and application design, an explicit foundation of how to implement the equations is needed. Hence, the finite element method based implementation of the model with all necessary boundary conditions is presented - this is called the modeling framework of IPMC. The model's extendability and applicability are demonstrated by applying it on self-oscillating actuation calculations, 3D domains, and cylindrical geometries. Furthermore, it is shown that by using more advanced hp-FEM, the problem size can be reduced and IPMC calculations can be carried out with realistic physical constants without high computational demands

Ryan B Wicker - One of the best experts on this subject based on the ideXlab platform.

David Espalin - One of the best experts on this subject based on the ideXlab platform.