DEVELOPMENT OF STRUCTURAL UNCERTAINTY MODELS

The development and utilization of an uncertainty model for structures that undergo a change in operational environment is presented. The mo tivating application is the development of an on-orbit (0-g) uncertain ty model for structural central based solely an ground (1-g) modeling and experimentation, although other applications can be used. A parame tric uncertainty model (mean errors and bounds on modal parameters) is developed for a nominal environment and then localized to specific de grees of freedom (mass and stiffness uncertainties) using a first-orde r sensitivity method. The nominal mass and stiffness uncertainties are then projected into a modified environment to create an analogous, mo dified uncertainty model. The middeck active control experiment is int roduced to verify the prediction of a space-based uncertainty model.