multiphysics - Space charge distribution synthesis by...

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Unformatted text preview: Space charge distribution synthesis by multiphysics simulation: application to the PWP techniques O. Gallot-LavallØe, J-L. Reboud Grenoble Electrical Engineering lab, Joseph Fourier University c/o CNRS, 25 Rue des Martyrs 38042 Grenoble, France Abstract- Initially we have implemented a model based on the Finite Element Method (FEM). This model consist in simulate experiments of space charge measurement: the principle of the various experiments consists in forcing the displacement of space charge by a pressure wave, temperature gradient or an electric excitation, and measuring the transitory current thus created at the boundaries of material or the sound emission associated to the generated movement. In this article, we propose an alternative to the traditional exploitation of the Pressure Wave Propagation techniques, based on a quasi-random approach of the space charge distribution by bringing together of the electric answers (experimented and simulated). Adopted methodology consists has to seek a space charge distribution, such as the simulated electric answer reaches a certain similarity with the experimentation. One shows as well as the space charge distribution can be obtained in a completely reversed way. Indeed this new methodology consists in finding the space charge distribution which gives a simulated electric answer nearest to that measured. I. INTRODUCTION In a precedent study [1], we proposed the use of a numerical model to simulate the measurement of space charge by propagation of a pressure wave on composites polymers [2]. Numerical simulations were performed with the SYSTUS¡ multiphysics software, developed by ESI Group. As first test case, we compared our simulation with the measurements obtained starting from a method based on relative displacement: the LASER induced pressure pulse method. This method is based on relative displacement; it consists in forcing the displacement of space charge compared to the electrodes creating by total influence a transient of charges in the electrodes. In practice, it&s the luminous energy absorption by a target (for example a layer of Indian ink) deposited on the surface of the material which causes a brutal rise in temperature and thus a dilation of this layer creating a pressure wave on both sides [3]. In this article, we present an alternative to the traditional exploitation of the Pressure Wave Propagation techniques, based on a quasi-random approach of the space charge distribution by bringing together of the electric answers (experimented and simulated). We will first of all point out the principal characteristics of the electro-mechanical uncoupled model build to simulate a PWP measurement. Then we will detail the algorithm allowing to find a space charge distribution representative of the awaited electrostatic phenomenon. And finally, we will discuss the limits of this approach....
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This note was uploaded on 06/08/2011 for the course ELECTRICAL 124 taught by Professor Ghjk during the Spring '11 term at Institute of Technology.

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multiphysics - Space charge distribution synthesis by...

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