Accession Number : ADA112707

Title :   Protection of Electrical Systems from EM Hazards - Design Guide.

Descriptive Note : Interim rept. 15 Jun 79-15 Oct 81,


Personal Author(s) : Sommer,David L

PDF Url : ADA112707

Report Date : Sep 1981

Pagination or Media Count : 211

Abstract : This report contains results of a two-phase study program investigating the effects of lightning strikes on aircraft and the resulting transients coupled on to the electrical systems. The design guide contains the historical background and the lighting threat assessment in the sections 1 and 2. Section 3 of the design guide contains the techniques for inherent hardening against the lightning strike electromagnetic energy. Section of 4 of the design guide provides two methods for evaluating electrical systems to determine the levels of transients that can be induced. The first method allows an electrical systems designer to make a preliminary assessment of the lightning strike threats. The second method allows a more detailed evaluation using a computer program called PRESTO. Section 5 identifies and examines the various military specifications covering the transients that existing electrical equipment has to withstand. Using this information, add-on protection hardware and hardening techniques were evaluated in Sections 6 and 7. Section B provides examples for selecting hardening techniques for advanced electrical systems. Sections 9, 10, and 11 discuss the reliability/maintainability, system safety and Design to Cost considerations in selection of the appropriate hardening techniques. (Author)

Descriptors :   *Electromagnetic shielding, *Military aircraft, *Avionics, Lightning, Hazards, Transients, Threat evaluation, Hardening, Electrical equipment, Coupling(Interaction), Airframes, Circuits, Electric filters, Electrical grounding, Electric wire, Routing, Fiber optics, Bonding, Electric cables, Protective equipment, Aluminum alloys, Titanium alloys, Composite materials, Maintainability, Reliability, Computerized simulation, Trade off analysis

Subject Categories : Aircraft
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE