Accession Number : AD0885321

Title :   Take-Off and Landing Critical Atmospheric Turbulence (TOLCAT) Experimental Investigation.

Descriptive Note : Interim rept. Mar 68-Nov 69,

Corporate Author : BATTELLE PACIFIC NORTHWEST LABS RICHLAND WA

Personal Author(s) : Elderkin, C. E. ; Powell, D. C. ; Dunbar, A. G. ; Horst, T. W.

Report Date : MAY 1971

Pagination or Media Count : 342

Abstract : A preliminary system for measuring, recording, and digitizing turbulence data was established and methods for data reduction and analyses were developed to describe the spatial and temporal aspects of turbulence. The system included a variety of sensors for evaluation, from which two were selected to be used in the final expanded measurement array. These two are the sonic and three-propeller anemometers. Computer programs were written for data reduction, moment, and probability distribution analyses, and for power spectral and cross spectral analyses. Turbulence data, from as many as seven simultaneously operated three-wind-component sensors mounted on towers, were collected in three different instrument arrays. The data were utilized to evaluate the multi-instrument operation for TOLCAT measurements, identifying necessary modifications that must be made to the instruments, their mounting supports, and procedures for calibration and operation. The data, recorded in the field on analog magnetic tape, were also utilized for establishing computer-controlled digitizing and digital data logging techniques. (Author)

Descriptors :   *ATMOSPHERIC MOTION, *AIRCRAFT LANDINGS, MEASUREMENT, TAKEOFF, TURBULENCE, DETECTORS, METEOROLOGICAL INSTRUMENTS, TOWERS, ANEMOMETERS, MICROMETEOROLOGY, DIGITAL SYSTEMS, SHORT TAKEOFF AIRCRAFT, DATA PROCESSING.

Subject Categories : Aerodynamics
      Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE