Uncertainty Propagation to Modal Parameters and Metrics

ABSTRACT:This proposal effort seeks to demonstrate the feasibility of developing a methodology for propagating measurement errors through common modal parameter estimation algorithms and assurance criterion. This effort will leverage existing uncertainty quantification and modal parameter estimation software. Two modal parameter estimation algorithms and two uncertainty propagation techniques will be considered during the Phase I program. An experimental and simulation (finite element) model will be constructed, tested, and analyzed using the proposed methodology. Additionally, the accuracy and efficiency of the proposed tool as well as important feedback and key learning lessons will be reported in the form a feasibility study.BENEFIT:Potential applications will include the use of the developed software to assist in the verification, validation and accreditation (VV&A) of any experimental modal analysis. An additional benefit includes the ability to analyze unit-to-unit variation in any mass produced component where structural dynamic considerations are important. Generic to any system requiring VV&A for experimental modal analysis, the developed software could be utilized by commercial companies such as Boeing, Lockheed Martin, and Northrop Grumman.