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# Accession Number:

## ADA102750

# Title:

## Development of an Aircraft Maneuver Load Spectrum Based on VGH Data

# Descriptive Note:

## Final rept.

# Corporate Author:

## AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OH DIRECTORATE OF FLIGHT SYSTEMS ENGINEERING

# Report Date:

## 1980-07-01

# Pagination or Media Count:

##
90.0

# Abstract:

## This report describes a procedure whereby a full scale aircraft maneuver load fatigue spectrum can be developed from recorded VGH data. It is assumed in this development that the internal loads stresses at the appropriate control points are available for combinations of velocity, load factor, altitudes and weight so that an interpolation on these points will provide the desired accuracy. The procedure will generate for a control point the cumulative probability of exceeding a given stress, exceedances per hour of a given stress level, the probability density function for stress and the stress spectrum. The aircraft spectrum is derived from the assumption that the aircraft test loads derived from a linear combination of balanced loading conditions will provide a good simulation of the stress history at and between the control points. The application of the program to new designs mission analysis and to tracking can be made without modification. The computer program for this calculation is included along with a sample problem. As an example of an application of this program, the stress exceedance functions for a control point on the wing of the F-4 are shown that were computed from the VGH data accumulated over a period of one year.

# Distribution Statement:

## APPROVED FOR PUBLIC RELEASE

#