Analytical and experimental investigations of the damping characteristics of bolted and welded structural connections for plates and shells

The design of the structural connections is important from the standpoint of reducing system vibration amplitudes or enhancing joint damping capacity. A stateof- the-art review was performed and a generic experimental model was developed and constructed. The test model consists of two concentric circular cylindrical shells and four vanes connected by groups of bolts. First, a finite element model was developed and analyzed, using the MSC/NASTRAN computer program. The first analysis was a modal survey of the model to investigate dynamic characteristics of the whole system. Secondly a frequency response analysis gave the input/output relationship between an input point (excitation) and an output point (response) in the frequency domain, which depends on the damping characteristics of the structure.supported in part by the Foundation research Program of the Naval Postgraduate School with fund provided by David W. Taylor Naval Ship Research and Development Center.http://archive.org/details/analyticalexperi00shinN00167-85-WR5-0371N

Investigation of the spin stability of the NPS Mini-Satellite (ORION)

A preliminary design of the Naval Postgraduate School Mini-Satellite consists of a long cylindrical body and four radial booms and uses the single spin stabilization scheme for its attitude control. Stability conditions between design parameters for simple spinning motions of the satellite in space are investigated by applying Liapunov stability theory and using the natural modes as the admissible functions of internal coordinates. The stability diagram from this study shows that the internal stability conditions due to the flexibility of booms limit the angular velocity range of simple spins whlie the Maximum Axis Rule limit the minimum lengths of booms.NPS Mini-Satellite (ORION) Projecthttp://archive.org/details/investigationofs00kimkMIPR F62400-87-0004N