Accession Number : AD0800059

Title :   DESIGN CALCULATIONS ON PROVEN TRAINER AND FIGHTER AIRCRAFT FOR THE VERIFICATION OF A GUST DESIGN PROCEDURE.

Descriptive Note : Final rept. Apr 65-Apr 66,

Corporate Author : NORTHROP CORP HAWTHORNE CA NORAIR DIV

Personal Author(s) : Hwang, Chintsun ; Kamberg, B. D. ; Pi, W. S. ; Cross, A. K.

Report Date : JUL 1966

Pagination or Media Count : 158

Abstract : Design calculations are performed on proven trainer and fighter aircraft for the purpose of verifying a new gust design procedure based on power spectral techniques. The aircraft used in the computation are Northrop Norair T-38 trainer and F-5A fighter. The new gust design procedure uses a gust power spectrum as the input in aircraft response calculation, as against the present discrete gust approach, where the input is a gust velocity profile with a single frequency determined by the aircraft speed and the gust gradient distance. The report describes the specific aircraft weight and flight configurations used in the computation. The choice of stress sensitive locations is explained and illustrated. Also presented is the computation procedure for obtaining the aircraft transfer functions to be used in both the discrete gust and power spectral approaches. Based on the gust input spectrum and the aircraft transfer functions, a number of aircraft gust response power spectra are generated. These latter spectral data are integrated along the frequency band to obtain the mean aircraft response levels and the average zero crossing counts which are the final results of the computation. Through the computation, various scales of turbulence and cut-off frequencies are used to study their effects on the end results of the new gust design procedure.

Descriptors :   (*JET FIGHTERS, DESIGN), (*JET TRAINING PLANES, GUST LOADS), (*GUST LOADS, MATHEMATICAL MODELS), WINGS, BENDING, MOMENT OF INERTIA, AEROELASTICITY, STRESSES, COMPUTER PROGRAMMING, FLOW CHARTING, NUMERICAL ANALYSIS, POWER SERIES, MATRICES(MATHEMATICS), AERODYNAMIC CHARACTERISTICS, TURBULENCE, RESPONSE, STATISTICAL ANALYSIS, AERODYNAMIC CONFIGURATIONS, WEIGHT, FUEL TANKS, EXTERNAL STORES, EQUATIONS OF MOTION.

Subject Categories : Attack and Fighter Aircraft
      Training Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE