Accession Number : AD0258408

Title :   AN ACCURATE DEFINITION AND USE OF THE RICHARDSON NUMBER FOR IDENTIFICATION OF THE ZONES OF AIRCRAFT BUMPINESS

Corporate Author : AMERICAN METEOROLOGICAL SOCIETY BOSTON MASS

Personal Author(s) : ZAVARINA,M.V. ; IUDIN,M.I.

Report Date : OCT 1960

Pagination or Media Count : 1

Abstract : The widespread concept that bumpiness can occur only due to turbulence is not entirely accurate. Wave motions at the surfaces of separation can also be a cause of bumpiness. Waves can cause appreciable aircraft oscillations in cases when the time that a plane flies a distance equal to the wavelength, is close to the period of free oscillations of the aircraft (the resonance phenomenon). Special investigations of wellregulated vertical motions are desirable from the point of view of their influence on aircraft oscillations. Despite these exceptions, the sphere of applicability of the Ri number is broad and the Richardson criterion in our modified form (Ri)y is useful for estimating the level of turbulent energy and the appearance of aircraft bumpiness associated with it. (Author)

Descriptors :   *AIRCRAFT, *ATMOSPHERES, *GUST LOADS, CLIMATE, DETERMINATION, IDENTIFICATION, NUMERICAL METHODS AND PROCEDURES, TURBULENCE, WIND

Distribution Statement : APPROVED FOR PUBLIC RELEASE