Analytical and Experimental Studies of the Quantification and Propagation of Uncertainties in Nonlinear System Modeling and Simulation
Abstract
This research focuses on developing methods and procedures suitable for use with dynamic response measurements from flexible structural components and assemblages that may incorporate elements undergoing significant multi-dimensional nonlinear deformations. By using a powerful, model-free approach to obtain computationally efficient reduced-order models, a general framework will be developed for the probabilistic representation and propagation of measured uncertainties in the stochastic nonlinear test articles, their related nonparametric nonlinear model, and the corresponding probabilistic time-history response of the physical system. The planned studies include carefully conducted experimental investigations of generic types of nonlinearities likely to be encountered in aerospace structures. The experimental studies are leading to a better understanding of the physics of the underlying phenomena, thus allowing the development of suitable reduced-order mathematical models to characterize the essential features of the document structural characteristics. High-fidelity models (both parametric as well as non-parametric) are being created that have the potential to provide predictive descriptions of nonlinear system behavior under arbitrary dynamic environments. Research activities are proceeding along two fronts: (1) an experimental phase involving the design and fabrication of an adjustable test apparatus for conducting studies on a generic multidimensional joint element that incorporates important nonlinear characteristics such as nonlinear elastic properties, hysteretic characteristics, and dead space nonlinearities involving friction; and (2) an analytical phase focused on the development of a theoretical framework for processing experimental structural response measurements from uncertain systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 02, 2004
- Accession Number
- ADA431071
Entities
People
- Sami F. Masri
Organizations
- University of Southern California