Javier Elias Zagal Herrera - Academia.edu (original) (raw)
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Papers by Javier Elias Zagal Herrera
Journal of Electrostatics, 2004
A lightning risk assessment necessarily implies a set of uncertainties related to lightning strik... more A lightning risk assessment necessarily implies a set of uncertainties related to lightning strike probability, presence of a damage channel (type of coupling) or presence of a victim (equipment, human beings, structure itself, etc.). In order to quantify and qualify these uncertainties a risk assessment methodology using fuzzy logic is proposed. Fuzzy logic seems to be a powerful tool capable of combining linguistic and numeric variables in order to estimate the subjectiveness involved in risk analysis and determine whether a risk level is acceptable or not. The methodology proposed in this paper is a contribution to the analysis of risk of damage due to lightning, particularly applied in Tropical Regions, where parameters such as ground flash density-GFD, and lightning current peak value-LCPV present a special behavior and determine the frequency and Intensity of lightning phenomenon.
IEEE Transactions on Electromagnetic Compatibility, 2009
In this paper, the hybrid electromagnetic model is applied to calculate lightning-induced voltage... more In this paper, the hybrid electromagnetic model is applied to calculate lightning-induced voltages over a lossy ground. Results provided by this model are compared with experimental data obtained from a reduced-scale model and with results simulated by the numerical electromagnetics code. Good agreement is achieved in all cases.
Journal of Electrostatics, 2004
A lightning risk assessment necessarily implies a set of uncertainties related to lightning strik... more A lightning risk assessment necessarily implies a set of uncertainties related to lightning strike probability, presence of a damage channel (type of coupling) or presence of a victim (equipment, human beings, structure itself, etc.). In order to quantify and qualify these uncertainties a risk assessment methodology using fuzzy logic is proposed. Fuzzy logic seems to be a powerful tool capable of combining linguistic and numeric variables in order to estimate the subjectiveness involved in risk analysis and determine whether a risk level is acceptable or not. The methodology proposed in this paper is a contribution to the analysis of risk of damage due to lightning, particularly applied in Tropical Regions, where parameters such as ground flash density-GFD, and lightning current peak value-LCPV present a special behavior and determine the frequency and Intensity of lightning phenomenon.
IEEE Transactions on Electromagnetic Compatibility, 2009
In this paper, the hybrid electromagnetic model is applied to calculate lightning-induced voltage... more In this paper, the hybrid electromagnetic model is applied to calculate lightning-induced voltages over a lossy ground. Results provided by this model are compared with experimental data obtained from a reduced-scale model and with results simulated by the numerical electromagnetics code. Good agreement is achieved in all cases.