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Modal vector estimation for closely spaced frequency modes
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Blair, M. Chung, Y. T. Craig Jr., R. R. |
| Copyright Year | 1982 |
| Description | Techniques for obtaining improved modal vector estimates for systems with closely spaced frequency modes are discussed. In describing the dynamical behavior of a complex structure modal parameters are often analyzed: undamped natural frequency, mode shape, modal mass, modal stiffness and modal damping. From both an analytical standpoint and an experimental standpoint, identification of modal parameters is more difficult if the system has repeated frequencies or even closely spaced frequencies. The more complex the structure, the more likely it is to have closely spaced frequencies. This makes it difficult to determine valid mode shapes using single shaker test methods. By employing band selectable analysis (zoom) techniques and by employing Kennedy-Pancu circle fitting or some multiple degree of freedom (MDOF) curve fit procedure, the usefulness of the single shaker approach can be extended. |
| File Size | 3645861 |
| Page Count | 42 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19820014643 |
| Archival Resource Key | ark:/13960/t2p60d608 |
| Language | English |
| Publisher Date | 1982-02-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Dynamic Response Shakers Degrees of Freedom Modes Standing Waves Modal Response Coupled Modes Vector Spaces Vibration Tests Aeroelasticity Frequency Ranges Vibration Simulators 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 |
