Accession Number:

AD1105916

Title:

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

Descriptive Note:

Technical Report,15 Mar 2017,14 Mar 2020

Corporate Author:

University of Wisconsin System Madison United States

Personal Author(s):

• Allen,Matthew S.
• Kwarta,Michael
• Van Damme,Christopher

Report Date:

2020-04-28

Pagination or Media Count:

123.0

Abstract:

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.

Descriptors:

• computational science
• computational fluid dynamics
• modulus of elasticity
• mechanics
• resonant frequency
• bayesian networks
• nonlinear dynamics
• modal analysis
• finite element analysis
• nonlinear systems

Subject Categories:

• Numerical Mathematics
• Theoretical Mathematics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE