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A new method to real-normalize measured complex modes
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Brown, David L. Allemang, Randall J. Zhang, Qiang Wei, Max L. |
| Copyright Year | 1987 |
| Description | A time domain subspace iteration technique is presented to compute a set of normal modes from the measured complex modes. By using the proposed method, a large number of physical coordinates are reduced to a smaller number of model or principal coordinates. Subspace free decay time responses are computed using properly scaled complex modal vectors. Companion matrix for the general case of nonproportional damping is then derived in the selected vector subspace. Subspace normal modes are obtained through eigenvalue solution of the (M sub N) sup -1 (K sub N) matrix and transformed back to the physical coordinates to get a set of normal modes. A numerical example is presented to demonstrate the outlined theory. |
| File Size | 473973 |
| Page Count | 12 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19880004236 |
| Archival Resource Key | ark:/13960/t5q866h98 |
| Language | English |
| Publisher Date | 1987-10-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Damping Errors Resonant Frequencies Computation Modal Response Coordinates Eigenvalues Data Processing Iteration Eigenvectors Matrices Mathematics Optimization Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
