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Computational Models for Nonlinear Aeroelastic Systems

Award Information

National Aeronautics and Space Administration
Award ID:
Program Year/Program:
2005 / STTR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
Clear Science Corp.
PO Box 233 663 Owego Hill Road Harford, NY -
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 2
Fiscal Year: 2005
Title: Computational Models for Nonlinear Aeroelastic Systems
Agency: NASA
Contract: NND05AB55C
Award Amount: $499,996.00


Clear Science Corp. and Duke University propose to develop and demonstratenew and efficient computational methods of modeling nonlinear aeroelastic systems. The methods will extend the scope of multi-disciplinary computational tools like NASA Dryden's STARS by augmenting linear eigenmode stability algorithms and coupled time-marching techniques. The objective is low-dimensional models that accurately reflect nonlinearity in both structure and fluid and that are efficient enough to permit full exploration of parameter space. In Phase I, our team has demonstrated the technical merit and feasibility of two types of model order reduction: proper orthogonal decomposition (POD) of the coupled-system variables and the method of harmonic balancing (HB). The HB and POD methods represent complementary and synergistic tracks toward meeting the objective of modeling fully nonlinear aeroelastic systems, providing the capability of efficiently analyzing important nonlinear aeroelastic behavior like limit cycle oscillations, hysteresis, higher harmonic and sub-harmonic resonances, jump resonances, entrainment, beating, and period doubling. The innovation offers the possibility of engineering software for predicting nonlinear aeroelastic behavior that is as accurate and efficient as the current methods of analyzing linear systems and linear behavior like flutter. In Phase II, we propose to integrate the POD and HB methods into a single package that facilitates engineering trade-studi

Principal Investigator:

Henry A. Carlson
Principal Investigator

Business Contact:

Henry A. Carlson
Small Business Information at Submission:

Clear Science Corp.
P.O. Box 233 Harford, NY 13784

EIN/Tax ID: 161603092
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Research Institution Information:
Duke University (Dept. Mech. Engr.)
180 Hudson Hall Box 90300
Durham, NC 27708
Contact: Earl Dowell
Contact Phone: (919) 660-5321
RI Type: Nonprofit college or university