Structural Dynamics of Cable Harnessed Spacecraft Structures.

摘要

This work focused on obtaining fundamental understanding of how the dynamics of a structure change when cables are attached to it. The work was motivated by the complexity of modeling satellites when structural elements are harnessed with signal and power cables. This problem has been identified by AFRL/VSSV as significant in shock and vibration modeling and verification of satellite systems. We performed basic research to illuminate the relevant structural dynamics producing predictive models of cable-harnessed structures. Our approach was to use novel analytical methods based on homogenization techniques, singularity functions, spectral element methods and model updating methods, complete with experimental validation and model verification. Our work provides an alternative to large order finite element modeling by providing distributed parameter models with 'exact' solutions. The basic research provides a better understanding of more complicated Air Force satellite structures that are harnessed with signal and power cables. The ultimate goal was to comprehend and quantify the effect of cable harnesses on structures that cannot be tested prior to launching and to provide a predictive modeling capability. The performed research consisted of both theoretical modeling and experimental validation. Experimental investigation was used for advancing and motivating theoretical modeling considerations by performing a series of successively more complex structural systems used to highlight various dynamic modes.