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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
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
C C Easterbrook
(Electro Magnetic Applications (United States) Denver, Colorado, United States)
R A Perala
(Electro Magnetic Applications (United States) Denver, Colorado, United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1984
Publication Information
Publication: International Aerospace and Ground Conference on Lightning and Static Electricity. 1984 Technical Papers (Supplement)
Publisher: National Aeronautics and Space Administration
Subject Category
Communications And Radar
Report/Patent Number
NASA-CP-2356
Meeting Information
Meeting: International Aerospace and Ground Conference on Lightning and Static Electricity
Location: Orlando, FL
Country: US
Start Date: June 26, 1984
End Date: June 28, 1984
Sponsors: National Interagency Coordination Group on Lighting and Static Electricity
Accession Number
85N16349
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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