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Ritz method for transient response in systems having unsymmetric stiffness
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Butler, Thomas G. |
| Copyright Year | 1989 |
| Description | The DMAP coding was automated to such an extent by using the device of bubble vectors, that it is useable for analyses in its present form. This feasibility study demonstrates that the Ritz Method is so compelling as to warrant coding its modules in FORTRAN and organizing the resulting coding into a new Rigid Format. Even though this Ritz technique was developed for unsymmetric stiffness matrices, it offers advantages to problems with symmetric stiffnesses. If used for the symmetric case the solution would be simplified to one set of modes, because the adjoint would be the same as the primary. Its advantage in either type of symmetry over a classical eigenvalue modal expansion is that information density per Ritz mode is far richer than per eigenvalue mode; thus far fewer modes would be needed for the same accuracy and every mode would actively participate in the response. Considerable economy can be realized in adapting Ritz vectors for modal solutions. This new Ritz capability now makes NASTRAN even more powerful than before. |
| File Size | 2004756 |
| Page Count | 52 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19890013583 |
| Archival Resource Key | ark:/13960/t75t8j786 |
| Language | English |
| Publisher Date | 1989-03-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Stiffness Matrix Transient Response Harmonics Bubbles Format Control Systems Design Vectors Mathematics Nastran Active Control Loads Forces Fortran Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
