Abstract
This paper presents the obtained results of experimental tests and modelling of lightning disturbances that were propagated in a model of aircraft cable bundle and caused by multiple lightning return-strokes interactions. The work is a continuation of previous research, which was concerned mainly with the interaction of lightning discharge with a single return-stroke. The section of the cable harness arranged above the metal plate was investigated. In one of its wires, a multiple-stroke current representing indirect lightning effects was injected from an impulse current generator dedicated to avionics immunity tests. Overvoltages induced at the ends of other wires surrounded by a braided shield, as well as the influence of line parameters and shield grounding condition on the shape and level of observed transients, were examined. The computer simulation results match the measurement data with satisfactory accuracy, and therefore, the presented model can be used to estimate indirect lightning effects in the wiring harness of avionics.
Highlights
Dangerous overvoltages and currents in on-board aircraft systems can occur due to lightning discharge striking directly to the airframe or in its vicinity [1,2,3]. These phenomena caused by the lightning electromagnetic impulse (LEMP) are called indirect effects
Computer simulations and experimental tests are used to optimize the parameters of cable lines and their routing
The frequency response of the scattered matrix shoEwxpsetrhiamtecnrotaslstaanldk cboemtwpeuetneragstgurdesiessorofatnhdevpircotipmaglaintieown iolfl lbieghmtnoirnegnsoutircgeeasbilne afomr ohdigehl er of farneqauirecnrcayftswiginrainl gcohmarpnoensesnwtse,rbeuctatrhreieydwoiullta. lTshoebeefmfeoctreosfusphpierledsssecdrebeyn ugsrionugntdhiengscorenen, theassuepxpperecstesdio.n of induced overvoltages along the lines surrounded by the braided shield has beeWn ihnevnesctoimgapteadri.nAg mthuelmtipelaesustrreomkeenstusrwgeitwh itthheasipmeauklaotivoenrs1fokrAthfoerstahmeefiprsotinptuolsfet,he repsryessteenmti,nggoionddicroecmt plilgiahntnceinwg aesffencotsti,cwedaswinitjhecsteodmientsomtahlel sdyisstcermepdanucriiensg. eTxpheerriemfoernet,atlhe tesptsr.esTehneteidndmuocdeedl ocavnerbveoultsaegdestocoesrtriemspaotenidneddirteocttlhigehcthnainragceteffreiscttiscsinotfhceuwrrierinntgchhaarnngeesss.of avionics
Summary
Dangerous overvoltages and currents in on-board aircraft systems can occur due to lightning discharge striking directly to the airframe or in its vicinity [1,2,3]. These phenomena caused by the lightning electromagnetic impulse (LEMP) are called indirect effects. There are several ways for the lightning discharge to interact with the electrical and electronic aircraft installations. A well-known way to reduce interference is to use wire shielding. The effectiveness of this solution depends primarily on the method of grounding its ends [8]
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