Accession Number:

AD0880678

Title:

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)

Descriptive Note:

Final rept.

Corporate Author:

DYNAMIC SCIENCE INC PHOENIX AZ AVSER FACILITY

Personal Author(s):

• Larsen, Stuart E.
• Drummond, John K.

Report Date:

1971-01-01

Pagination or Media Count:

77.0

Abstract:

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.

Descriptors:

• *AVIATION SAFETY
• *AIRFRAMES
• *HELICOPTERS
• AVIATION ACCIDENTS
• STRUCTURAL PROPERTIES
• IMPACT
• MATHEMATICAL MODELS
• COMPUTER PROGRAMMING

Subject Categories:

• Helicopters

Distribution Statement:

APPROVED FOR PUBLIC RELEASE