Aircraft Ground Vibration Testing at the NASA Dryden Research Facility – 1993
Kehoe, Michael W. and Freudinger, Lawrence C. (1994) Aircraft Ground Vibration Testing at the NASA Dryden Research Facility – 1993. Technical Report NASA TM-104275, Research Engineering, NASA Dryden Flight Research Center.
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Abstract
The NASA Dryden Flight Research Facility performs ground vibration testing to assess the structural characteristics of new and modified research vehicles. This paper updates the research activities, techniques used, and experiences in applying this technology to aircraft since 1987. Test equipment, data analysis methods, and test procedures used for typical test programs are discussed. The data presented illustrate the use of modal test and analysis in flight research programs for a variety of aircraft. This includes a technique to acquire control surface free-play measurements on the X-31 airplane more efficiently, and to assess the effects of structural modifications on the modal characteristics of an F-18 aircraft. In addition, the status and results from current research activities are presented. These data show the effectiveness of the discrete modal filter as a preprocessor to uncouple response measurements into simple single-degree-of-freedom responses, a database for the comparison of different excitation methods on a JetStar airplane, and the effect of heating on modal frequency and damping.
| EPrint Type: | NASA Technical Memorandum |
|---|---|
| Keywords: | Ground vibration test, Hot structures, JetStar airplane, Modal analysis, Modal filter |
| Subjects: | Aircraft/Project: Multiple Aircraft (01 - 09) Aeronautics: (05) Aircraft Design, Testing And Performance Aircraft/Project: F-18 Aircraft/Project: X-31 |
| ID Code: | 236 |
| Deposited On: | 21 July 2004 |
| Additional Information: | 23 pages. Also presented at the 12th International Modal Analysis Conference (IMAC), Honolulu, HI, Feb. 2, 1994. Sponsored by SEM. |
