A Frequency Domain Approach to Pretest Analysis Model Correlation and Model Updating for the Mid-Frequency Range
Abstract
Large, high-performance space vehicles will require test-validated finite element models for accurate response predictions. The models of these precision spacecraft must be valid to a higher frequency range, referred to as the mid-frequency range, which is characterized by high modal density. The product of this research project is a complete finite element model validation procedure for the mid-frequency range, or any system with high modal density. The procedure includes sensor placement, analytical model reduction, test-analysis correlation, and finite element model updating. The new approach is totally independent of modal analysis. The results of this research are significant because current state-of-the-art techniques based on modal properties do not work for the mid-frequency range due to high modal density. The new approach differs from past work because it is based on principal components of the system frequency response, and frequency band averaging. The principal components are less sensitive to modeling errors and uncertainties, and can be truncated based on system energy. Frequency band averaging of response allows model uncertainty to be included in the validation process.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 2009
- Accession Number
- ADA495365
Entities
People
- Aaron Nimityongskul
- Daniel C. Kammer
Organizations
- University of Wisconsin–Madison