Control Systems for Platform Landings Cushioned by Air Bags
Final technical rept. Jul-Aug 1985
ARMY NATICK RESEARCH DEVELOPMENT AND ENGINEERING CENTER MA
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This report presents an exploratory mathematical study of control systems for airdrop platform landings cushioned by airbags. The basic theory of airbags is reviewed and solutions to special cases are noted. A computer program is presented, which calculates the time-dependence of the principal variables during a landing under the action of various control systems. Two existing control systems of open-loop type are compared with a conceptual feedback closed-loop system for a fairly typical set of landing conditions. The feedback controller is shown to have performance much superior to the other systems. The feedback system undergoes an interesting oscillation not present in the other systems, the source of which is investigated. Recommendations for future work are included. Keywords Air drop operations, Airbags, Platform landings, Cushioning, Landing aids, Aerial delivery, Landing impact, Impact shock, Control systems.
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