This paper explores how much detailed an automotive electric system geometry can be to optimize simulation computational effort. For this purpose, simulations related to two kinds of analysis -crosstalk and external radiated disturbancehave been run through a Finite Element Method (FEM) based software and a Circuit Theory based one. Crosstalk simulated signals in time domain have been statistically compared with an inside vehicle measurement. Different complexity models have been tested in this correlation process. This procedure has been used to verify automotive geometric models' accuracy for a certain frequency range. The main goal is to verify the computational savings by using some techniques and suppressing some negligible details of car's geometry.
This work consists in an investigation about the electromagnetic interaction between two vehicular systems. The specific circuits under investigation are driven by the radio and the airbag Electronic Control Unit (ECU) and have the right rear speaker and pre-tensioner, respectively, as loads. The occurrence of this kind of interaction, known as crosstalk, is sub-divided into two classes: inductive and capacitive coupling. These phenomena are related to magnetic and electric fields couplings, respectively, and they are usually inseparable. Nevertheless, one of these effects can be predominant in relation to the other. Obviously, none of them is desirable and, when noticed, can lead to anomalies in the vehicular operation. The methodology of this work is based on harnesses' time and frequency domain voltage measurements, monitoring of airbag ECU's operation and a prediction of inductive and capacitive contributions to the overall coupling between the systems. These tasks have required the use of an oscilloscope, the information from the On-Board Diagnostic (OBD) terminal and the simulation software Ansys® Q3D Extractor. Some worst-case harnesses' spatial dispositions schemes have been proposed and tested. Finally, some modifications in the vehicle's design have been proposed and tested with the purpose of decreasing the probability of error occurrence due to crosstalk.
Resumo O presente trabalho apresenta resultados de simulações numéricas de uma célula TEM assimétrica aberta com o objetivo de otimizar seu desempenho. Entre as otimizações, é investigado o uso de fendas resistivas para estender a faixa de frequência de operação da célula. Além disso, otimiza-se o casamento de impedância entre o conector coaxial e a célula TEM. São apresentados os resultados medidos da transição otimizada em laboratório. Foi construída, também, uma célula TEM assimétrica e seu desempenho foi verificado em laboratório, obtendo-se uma perda de retorno maior que 10 dB na faixa de operação (30 MHz a 3 GHz).
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