Physics-Based Identification, Modeling and Risk Management for Aeroelastic Flutter and Limit-Cycle Oscillations (LCO)

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$99,938.00
Award Year:
2009
Program:
SBIR
Phase:
Phase I
Contract:
NNX09CF03P
Award Id:
90798
Agency Tracking Number:
084393
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
1500 Bull Lea Road, Suite 203, Lexington, KY, 40511
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
790637867
Principal Investigator:
PatrickHu
Principal Investigator
(859) 699-0441
patrick.g.hu@advanceddynamics-usa.com
Business Contact:
PatrickHu
Business Official
(859) 699-0441
patrick.g.hu@advanceddynamics-usa.com
Research Institute:
n/a
Abstract
The proposed research program will develop a physics-based identification, modeling and risk management infrastructure for aeroelastic transonic flutter and limit-cycle oscillations (LCO). This capability will be built upon high fidelity state-of-the-art theoretical/computational methods as validated and verified by available experimental data bases, and will include (1) rapid flutter boundary determination for a wide range of configurations; (2) an assessment of the relative importance of various aerodynamic and structural nonlinearities for aircraft and aerospace configurations that are determined to be flutter critical and hence potentially capable of LCO; (3) an assessment of expected LCO amplitudes based upon high fidelity computational models; (4) an assessment of the potential for active and/or passive alleviation of LCO; and (5) a proposed risk management methodology that incorporates a prediction of tolerable LCO amplitudes and the capability for reducing unacceptable LCO response. Key challenges and milestones to by met include (1) a demonstration of the use of Navier-Stokes based CFD models and nonlinear structural models, including the use of system identification methods as appropriate and needed to predict flutter and LCO; (2) a demonstration of accurate modeling of aerodynamic and structural nonlinearities such as large shock wave motion, separated flow, structural freeplay and large geometric structural deflections and their impact on flutter and LCO; (3) characterization and evaluation of nonlinear dampers and nonlinear stiffness devices for alleviating LCO; (4) characterization and evaluation of active control systems for alleviating LCO; and (5) design and demonstration in wind tunnel test and flight test of an LCO alleviation device.

* information listed above is at the time of submission.

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