Accession Number : ADP003715

Title :   Continuum Modelling of Damping in Large Space Structures,


Personal Author(s) : Abrate,S. ; Sun,C. T.

Report Date : 1984

Pagination or Media Count : 9

Abstract : Large Space Structures (LSS) are periodic lattices made up of a large number of elements. Their overall appearance may be that of a beam or a plate, complexity rather than that of their expected behavior. Therefore several investigators have developed equivalent continuum models to simplify linear and nonlinear analyses. These simple models accurately represent the behavior of the original structure for long wavelengths. LSS are subjected to stringent requirements for position, shape and vibration control so that an active control system needs to be implemented. Passive damping in LSS insures the stability of the active control system, allows for higher gains, reduces the bandwidth and therefore the number of sensors and actuators to be used. Sources of damping can be many, among which joint friction and internal damping seem of interest. In this study internal damping will be considered. The formulation of mathematical models including damping effects for discrete and continuous structures are discussed, the damping properties of the equivalent continuum models are determined and results are presented for several examples. (Author)

Descriptors :   *Structural mechanics, *Mathematical models, *Damping, *Spacecraft, Control systems, Finite element analysis, Lattice dynamics, Shape, Vibration

Distribution Statement : APPROVED FOR PUBLIC RELEASE