Analysis of Helicopter Structural Crashworthiness. Volume 2. User Manual for "Crash", A Computer Program for the Response of a Spring-Mass System Subjected to One-Dimensional Impact Loading (UH-1D/H Helicopter Application)
DYNAMIC SCIENCE INC PHOENIX AZ AVSER FACILITY
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A mathematical model which may be used to determine the dynamic response of a helicopter airframe subjected to vertical crash loading was developed. This report is, in effect, a manual which will facilitate the use of the computer program CRASH. The program was written to solve the equations and to handle the nonlinearities and constraints which result from use of the mathematical model. The program was used to evaluate the response of the UH-1DH helicopter to vertical impact loadings. Recommendations were made which, when implemented, will reduce the forces transmitted to the floor and transmission of the aircraft.