Effect of Gravity on Dynamic Behavior of Beams

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by Ralph J. Dornsife, U.S. Army Corps of Engineers, United States,

Document Type: Proceeding Paper

Part of: Engineering, Construction, and Operations in Space II:

Abstract: Large space structures will be needed to provide structural framework for maintaining relative positions of individual components of systems in low earth orbit. Particularly because of the high cost of transporting payload into low earth orbit, large space structures must first be dynamically analyzed and tested on earth. The resulting ground based test behavior must be correlated to behavior in a microgravity environment. Past laboratory testing has, largely, examined dynamic behavior only in directions perpendicular to the gravity vector. This study examines the correlation between earth based natural frequencies in vibration directions parallel to the gravity vector and the theoretical natural frequencies encountered in a microgravity environement. The structure considered is a prismatic beam.

Subject Headings: Space frames | Orbits | Gravity forces | Beams | Structural behavior | Space structures | Structural analysis | Structural dynamics |

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