Abstract
Shielded wires are widely used in electric and hybrid electric vehicles. Estimation of the radiated emissions from these cables require an appropriate description of the transfer impedance. The Kley Model describes this transfer impedance analytically as a function of geometrical parameters of the shield. The shield parameters are too intricate to be characterized and specified in datasheets, hence, the parameters have an uncertainty associated with them which does not allow unique modelling of the cable. These uncertain parameters generally influence the radiated emission characteristics of a given cable. Conventional techniques to analyze the parameters' impact are usually through several simulations or measurements based upon certain approximations of the uncertain parameters. In this article, we use Polynomial Chaos Expansion to construct a surrogate model of the radiated field in the frequency range from 10 MHz to 1 GHz as a function of all geometrical parameters of the shield. Surrogates are developed for Shielded Twisted Pairs and coaxial cables. We subsequently use the developed surrogate models to study the impact of variations of the shield parameters on the radiated electric fields.
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