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A comparison of lightning and nuclear electromagnetic pulse response of a helicopterA numerical modeling technique is utilized to investigate the response of a UH-60A helicopter to both lightning and nuclear electromagnetic pulses (NEMP). The analytical approach involves the three-dimensional time domain finite-difference solutions of Maxwell's equations. Both the external currents and charges as well as the internal electromagnetic fields and cable responses are computed. Results of the analysis indicate that, in general, the short circuit current on internal cables is larger for lightning, whereas the open-circuit voltages are slightly higher for NEMP. The lightning response is highly dependent upon the rise time of the injected current as was expected. The analysis shows that a coupling levels to cables in a helicopter are 20 to 30 dB larger than those observed in fixed-wing aircraft.
Document ID
19850008040
Document Type
Conference Paper
Authors
Easterbrook, C. C. (Electro Magnetic Applications, Inc. Denver, CO, United States)
Perala, R. A. (Electro Magnetic Applications, Inc. Denver, CO, United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1984
Publication Information
Publication: NASA. Langley Research Center Intern. Aerospace and Ground Conf. on Lightning and Static Elec.
Subject Category
COMMUNICATIONS AND RADAR
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19850008034Analytic PrimaryInternational Aerospace and Ground Conference on Lightning and Static Electricity. 1984 technical papers. Supplement
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