Accession Number : ADA020103

Title :   Responses of Small Rigid Aircraft to Discrete and Continuous Gust Analysis - Phase I.

Descriptive Note : Final rept. Nov 72-Nov 74,

Corporate Author : NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J

Personal Author(s) : Petrakis,John ; Miller,Nelson

Report Date : DEC 1975

Pagination or Media Count : 124

Abstract : An evaluation is made of methods developed for estimating longitudinal and lateral rigid-body responses of airplanes to random atmospheric turbulence. A computer program has evolved from this study which calculates general aviation aircraft stability derivatives from known geometric properties to be used as inputs to the calculation of aircraft response (also a developed part of the computer program). It was found that the two degrees-of-freedom rigid-body power spectral density analysis produced lower normal load factor responses than a similar single degree-of-freedom analysis for aircraft of gross weight from 3,000 to 17,500 pounds. Also to produce an equivalent discrete load factor for the two degrees-of-freedom analysis, a higher spectral velocity value must be used compared to that of the single degree-of-freedom approach.

Descriptors :   *Airplanes, *Gust loads, Dynamic response, Estimates, Turbulence, Methodology, Computer applications, Geometry, Rigidity, Mathematical analysis, Stability, Center of gravity, Tails(Aircraft), Computer programs

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE