Accession Number : AD0643774

Title :   A SUMMARY OF SOME RECENT DEVELOPMENTS IN THE DESCRIPTION OF ATMOSPHERIC TURBULENCE USED FOR AIRCRAFT STRUCTURAL DESIGN.

Descriptive Note : Technical rept., 1 Feb-1 May 66,

Corporate Author : SYSTEMS ENGINEERING GROUP RESEARCH AND TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Austin,William Hugh

Report Date : AUG 1966

Pagination or Media Count : 31

Abstract : In recent years, aircraft structures engineers have come to rely on power spectral density concepts in the description of atmospheric turbulence used in structures work. This is primarily due to a growing awareness that the spectral approach is far more realistic than the heretofore used 'discrete gust' concept. Although there is a considerable difference of opinion among various investigators on the precise mathematical forms of relations used in the spectral approach, it appears that the approach can be used with confidence on most present day aircraft as long as it is applied in a consistent fashion. Using spectral techniques, it is possible to convert aircraft gust acceleration statistics into a form that can be used by engineers as an accurate description of atmospheric turbulence for various classes of aircraft. These techniques have been applied to a very large sample of B-52 gust acceleration statistics taken during cruise operations to demonstrate the procedure. It is noted that, even if the mathematical forms of relations used in the spectral procedure are changed, changes in the description of atmospheric turbulence can be made rather easily.

Descriptors :   (*AIRCRAFT, STRUCTURES), (*ATMOSPHERIC MOTION, AIRCRAFT), GUST LOADS, ACCELERATION, LOADS(FORCES), GUSTS, TURBULENCE, VELOCITY, AIRFRAMES, SYSTEMS ENGINEERING

Subject Categories : Aerodynamics
      Aircraft
      Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE