Characterization of Viscoelastic Damping in an Antenna Structure
Item
- Title
- Characterization of Viscoelastic Damping in an Antenna Structure
- Description
- The dynamics of a ribbed antenna structure are examined. The symmetry of the structure generates repeated natural frequencies and hence a "beating" phenomena in the dynamic response of the structure. Two of the antenna's ribs are replaced with passively damped ribs which are treated with a constrained viscoelastic material. Since these repeated natural frequencies cannot be identified using standard frequency domain techniques, a time domain method, the Eigensystem Realization Algorithm (ERA), is employed to measure damping in the repeated and closely spaced natural frequencies. A comparison is made between ERA and the Polyreference identified modal parameters. Consideration is given to a slight structural modification to increase the interaction between the damped and undamped antenna ribs, thereby increasing the overall performance of the viscoelastic damping in each mode.
- Creator
- Argento, James
- Carlin, Robert
- Garcia, Ephrahim
- Publisher
- Wright-Patterson Air Force Base, OH : Wright Laboratory, Flight Dynamics Directorate, Air Force Systems Command
- Date
- 1991
- Format
- 1 online resource (14 pages) : ill.
- Type
- article
- Abstract
- The dynamics of a ribbed antenna structure are examined. The symmetry of the structure generates repeated natural frequencies and hence a "beating" phenomena in the dynamic response of the structure. Two of the antenna's ribs are replaced with passively damped ribs which are treated with a constrained viscoelastic material. Since these repeated natural frequencies cannot be identified using standard frequency domain techniques, a time domain method, the Eigensystem Realization Algorithm (ERA), is employed to measure damping in the repeated and closely spaced natural frequencies. A comparison is made between ERA and the Polyreference identified modal parameters. Consideration is given to a slight structural modification to increase the interaction between the damped and undamped antenna ribs, thereby increasing the overall performance of the viscoelastic damping in each mode.
- Date Issued
- 1991-08
- Extent
- 14
- Corporate Author
- State University of New York at Buffalo
- Laboratory
- Wright Laboratory
- Report Number
- WL-TR-91-3078 Volume II, pages EDF-1 to EDF-14
- DoD Project
- 2401
- DoD Task
- 240104
- Distribution Conflict
- No
- Index Abstract
- Contrails only
- Photo Quality
- Not Needed
- Report Availability
- Full text available
- Provenance
- University of Colorado Colorado Springs, Kraemer Family Library
- Identifier
- ADA241312
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| Title | Class |
|---|---|
| Proceedings of Damping '91: 13-15 February 1991 San Diego, California (EAA-1 through GBC-16) |