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Analysis of wind tunnel oscillatory data of the x-31a aircraft
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Smith, Mark S. |
| Copyright Year | 1999 |
| Description | Wind tunnel oscillatory tests in pitch, roll, and yaw were performed on a 19%-scale model of the X-31A aircraft. These tests were used to study the aerodynamic characteristics of the X-31A in response to harmonic oscillations at six frequencies. In-phase and out-of-phase components of the aerodynamic coefficients were obtained over a range of angles of attack from 0 to 90 deg. To account for the effect of frequency on the data, mathematical models with unsteady terms were formulated by use of two different indicial functions. Data from a reduced set of frequencies were used to estimate model parameters, including steady-state static and dynamic stability derivatives. Both models showed good prediction capability and the ability to accurately fit the measured data. Estimated static stability derivatives compared well with those obtained from static wind tunnel tests. The roll and yaw rate derivative estimates were compared with rotary-balanced wind tunnel data and theoretical predictions. The estimates and theoretical predictions were in agreement at small angles of attack. The rotary-balance data showed, in general, acceptable agreement with the steady-state derivative estimates. |
| File Size | 3951041 |
| Page Count | 126 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19990018654 |
| Archival Resource Key | ark:/13960/t12p02f64 |
| Language | English |
| Publisher Date | 1999-02-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Stability And Control X-31 Aircraft Static Stability Scale Models Aerodynamic Coefficients Aerodynamic Forces Yaw Pitch Inclination Dynamic Stability Harmonic Oscillation Unsteady Aerodynamics Wind Tunnel Tests Mathematical Models Roll Angle of Attack Aerodynamic Characteristics Stability Derivatives Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
