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Testing and Model Updating for Geometrically Nonlinear Hypersonic Vehicle Assemblies Using Nonlinear Normal Modes

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University of Wisconsin System Madison United States

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As the USAF begins to deploy an Airframe Digital Twin ADT to track the life and maintenance of each vehicle, one can expect each vehicle to vary somewhat from its nominal blueprint and its dynamics will evolve as the vehicle ages or is modified. This work explored a new model updating framework based on nonlinear normal modes that was used to understand and validate the computational models, and to update the model to assure that it accurately represents the nonlinear structure of interest. A model updating strategy was proposed and tested on various simplified structures to evaluate its applicability for substructures of aircraft that are or will be of interest for future vehicles.

Descriptive Note:

Technical Report,15 Mar 2017,14 Mar 2020



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Approved For Public Release;

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