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Enhanced element-specific modal formulations for flexible multibody dynamics
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Ryan, Robert R. |
| Copyright Year | 1989 |
| Description | The accuracy of current flexible multibody formalisms based on assumed modes is examined in the context of standard spacecraft motions involving structural components undergoing both slow and fast overall translational and rotational motions as well as small deformations. Limitations of current techniques in treating: (1) element-specific coupling behavior of large motion and small deformation, and (2) motion-induced structural stiffness variations, are noted. The roles of nonlinear and linear elastic structural theories in accurately predicting transient large-displacement dynamic behavior of flexible multibody systems are examined in detail. Coupling effects between deformation and overall motion are carefully scrutinized in the context of assumed-mode discretization techniques. Consistently linearized beam, plate, and shell formulations involving in-plane stretch variables are proposed and shown to yield very accurate simulation results and extremely fast modal convergence for most motions involving small strains. In some particular cases, however, in which membrane stiffness dominates bending stiffness, a nonlinear strain formulation is required in order to capture proper coupling between deformation and overall motion. |
| File Size | 369031 |
| Page Count | 26 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900000778 |
| Archival Resource Key | ark:/13960/t1fj7c58x |
| Language | English |
| Publisher Date | 1989-05-01 |
| Access Restriction | Open |
| Subject Keyword | Spacecraft Design, Testing And Performance Dynamic Structural Analysis Finite Element Method Deformation Plates Structural Members Flexible Spacecraft Beams Supports Stiffness Mathematical Models Coupling Rotation Spacecraft Motion Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
