Accession Number : AD0655825

Title :   A DESCRIPTION OF FOUR WIND-TUNNEL DYNAMIC MEASURING TECHNIQUES.

Descriptive Note : Research and development rept.,

Corporate Author : DAVID TAYLOR MODEL BASIN WASHINGTON D C AERODYNAMICS LAB

Personal Author(s) : O'Neill,Edwin B. ; Phillips,Kenneth A.

Report Date : MAR 1967

Pagination or Media Count : 60

Abstract : Results of a study comparing the damping-in-pitch parameter as obtained from four experimental techniques are presented. Each of the methods is briefly described and measured values given. The four methods used were: a single degree-of-freedom free oscillation, a single degree-of-freedom forced oscillation, a three-degree-of-freedom free oscillation, and a free-flight scheme. The damping-in-pitch compares reasonably well, though some data scatter exists. The forced oscillation measurements are shown to yield the more consistent values. All of the experimental schemes are shown to yield highly accurate static force and moment coefficient slopes. (Author)

Descriptors :   (*PITCH(MOTION), *DAMPING), (*AERODYNAMIC CHARACTERISTICS, MEASUREMENT), TEST METHODS, WIND TUNNELS, OSCILLATION, FLIGHT, FREE FLIGHT MODELS, CYLINDRICAL BODIES, CONICAL BODIES

Subject Categories : Aerodynamics
      Test Facilities, Equipment and Methods
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE