A METHOD OF ACCURATELY MEASURING DYNAMIC STABILITY DERRIVATIVES IN TRANSONIC AND SUPERSONIC WIND TUNNELS,
Abstract
This paper describes the method and equipment used at the Langley Research Center of the National Aeronautics and Space Administration for measuring dynamic stability derivatives in transonic and supersonic wind tunnels. The equipment inexorably forces the sting-mounted model to perform a single-degree-of-freedom sinusoidal oscillation while measurrements are made of the displacement and of the moment required to sustain the oscillation. The method is particularly well adapted to the testing of unorthodox aerodynamic bodies whose stability is unpredictable. The frequency and amplitude of the oscillation are controlled by the operator and not dictated by the characteristics of the body. Airstream turbulence and buffeting do not affect the results. Unstable bodies do not cause the mechanism to diverge and configurations with negative damping can be tested. The equipment has proven to be a very versatile research tool. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1961
- Accession Number
- AD0447783
Entities
People
- Albert L. Braslow
- Harleth G. Wiley
Organizations
- AGARD