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Active vertical tail buffeting alleviation on a twin-tail fighter configuration in a wind tunnel
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Moses, Robert W. |
| Copyright Year | 1997 |
| Description | A 1/6-scale F-18 wind-tunnel model was tested in the Transonic Dynamics Tunnel at the NASA Langley Research Center as part of the Actively Controlled Response Of Buffet-Affected Tails (ACROBAT) program to assess the use of active controls in reducing vertical tail buffeting. The starboard vertical tail was equipped with an active rudder and other aerodynamic devices, and the port vertical tail was equipped with piezoelectric actuators. The tunnel conditions were atmospheric air at a dynamic pressure of 14 psf. By using single-input-single-output control laws at gains well below the physical limits of the control effectors, the power spectral density of the root strains at the frequency of the first bending mode of the vertical tail was reduced by as much as 60 percent up to angles of attack of 37 degrees. Root mean square (RMS) values of root strain were reduced by as much as 19 percent. Stability margins indicate that a constant gain setting in the control law may be used throughout the range of angle of attack tested. |
| File Size | 438751 |
| Page Count | 8 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20040110392 |
| Archival Resource Key | ark:/13960/t9479b535 |
| Language | English |
| Publisher Date | 1997-01-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Design, Testing And Performance Root-mean-square Errors Tail Assemblies Stability Transonic Wind Tunnels F-18 Aircraft Siso Control Systems Piezoelectric Actuators Flow Visualization Wind Tunnel Models Control Theory Angle of Attack Active Control Buffeting Leading Edges Dynamic Pressure 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 |
