Summary

International Symposium on Electromagnetic Compatibility

2009

Session Number:24R1

Session:

Number:24R1-2

Accounting for Uncertainty in EMC Studies

L. R. D. Menezes,  

pp.753-756

Publication Date:2009/7/20

Online ISSN:2188-5079

DOI:10.34385/proc.14.24R1-2

PDF download (184.2KB)

Summary:
The paper addresses the use of statistical techniques in the assessment of the response of complex systems subject to uncertain input parameters. The traditional approach based on the Monte Carlo technique requires numerous simulations spanning the breadth of parameter distribution. Tens of thousands of simulations are required making this a very computationally intensive approach which is only possible for very simple systems. The paper presents an approach based on the Unscented Transform (UT) technique where a small number of simulations is required. The results of these simulations are combined with appropriate weights to make good estimates of the statistical moments and the distribution of important system responses. The basics of the UT approach are described and illustrated with simple examples. More complex situations involving the calculation of the shielding effectiveness (SE) of equipment cabinets are also presented together with measures of the sensitivity of the SE to particulate design parameters. It is shown that the UT can offer reasonably accurate results in a computationally efficient manner. Such techniques offer a lot of promise in EMC studies where uncertainties in design parameters are a common feature.