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Unsteady aerodynamic testing using the dynamic plunge pitch and roll model mount
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Lutze, Frederick H. Fan, Yigang |
| Copyright Year | 1999 |
| Description | A final report on the DyPPiR tests that were run are presented. Essentially it consists of two parts, a description of the data reduction techniques and the results. The data reduction techniques include three methods that were considered: 1) signal processing of wind on - wind off data; 2) using wind on data in conjunction with accelerometer measurements; and 3) using a dynamic model of the sting to predict the sting oscillations and determining the aerodynamic inputs using an optimization process. After trying all three, we ended up using method 1, mainly because of its simplicity and our confidence in its accuracy. The results section consists of time history plots of the input variables (angle of attack, roll angle, and/or plunge position) and the corresponding time histories of the output variables, C(sub L), C(sub D), C(sub m), C(sub l), C(sub m), C(sub n). Also included are some phase plots of one or more of the output variable vs. an input variable. Typically of interest are pitch moment coefficient vs. angle of attack for an oscillatory motion where the hysteresis loops can be observed. These plots are useful to determine the "more interesting" cases. Samples of the data as it appears on the disk are presented at the end of the report. The last maneuver, a rolling pull up, is indicative of the unique capabilities of the DyPPiR, allowing combinations of motions to be exercised at the same time. |
| File Size | 8026978 |
| Page Count | 257 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20000013325 |
| Archival Resource Key | ark:/13960/t5bc8x36h |
| Language | English |
| Publisher Date | 1999-08-01 |
| Access Restriction | Open |
| Subject Keyword | Aerodynamics Unsteady Aerodynamics Wind Tunnel Tests Signal Processing Aircraft Maneuvers Dynamic Models Roll Angle of Attack Aerodynamic Characteristics Stability Derivatives Data Reduction Pitch Inclination Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
