Loading...
Please wait, while we are loading the content...
Similar Documents
Modal identities for multibody elastic spacecraft: an aid to selecting modes for simulation
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Hablani, Hari B. |
| Copyright Year | 1989 |
| Description | The question: Which set of modes furnishes a higher fidelity math model of dynamics of a multibody, deformable spacecraft (hinges-free or hinges-locked vehicle modes) is answered. Two sets of general, discretized, linear equations of motion of a spacecraft with an arbitrary number of deformable appendages, each articulated directly to the core body, are obtained using the above two families of modes. By a comparison of these equations, ten sets of modal identities are constructed which involve modal momenta coefficients and frequencies associated with both classes of modes. The sums of infinite series that appear in the identities are obtained in terms of mass, and first and second moments of inertia of the appendages, core body, and vehicle by using certain basic identities concerning appendage modes. Applying the above identities to a four-body spacecraft, the hinges-locked vehicle modes are found to yield a higher fidelity model than hinges-free modes, because the latter modes have nonconverging modal coefficients; a characteristic proved and illustrated. |
| File Size | 836045 |
| Page Count | 13 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900013759 |
| Archival Resource Key | ark:/13960/t3227t56n |
| Language | English |
| Publisher Date | 1989-12-15 |
| Access Restriction | Open |
| Subject Keyword | Computer Programming And Software Flexible Bodies Moments of Inertia Deformation Control Systems Design Mathematical Models Computerized Simulation Linear Equations Equations of Motion Many Body Problem Appendages Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
