NASA SBIR 2007 Solicitation


PROPOSAL NUMBER: 07-2 A2.04-8684
SUBTOPIC TITLE: Aeroelasticity
PROPOSAL TITLE: Aeroelastic Uncertainty Analysis Toolbox

SMALL BUSINESS CONCERN (Firm Name, Mail Address, City/State/Zip, Phone)
Systems Technology, Inc.
13766 South Hawthorne Blvd.
Hawthorne, CA 90250 - 7083
(310) 679-2281

PRINCIPAL INVESTIGATOR/PROJECT MANAGER (Name, E-mail, Mail Address, City/State/Zip, Phone)
David H Klyde Systems Technology, Inc.
13766 S Hawthorne Blvd.
Hawthorne, CA 90250 - 7083
(310) 679-2281

Expected Technology Readiness Level (TRL) upon completion of contract: 2 to 3

TECHNICAL ABSTRACT (Limit 2000 characters, approximately 200 words)
Flutter is a potentially explosive phenomenon that results from the simultaneous interaction of aerodynamic, structural, and inertial forces. The nature of flutter mandates that flight testing be cautious and conservative. In addition to the flutter instability, adverse aeroelastic phenomena include limit cycle oscillations, buffeting, buzz, and undesirable gust response. The analytical prediction of aeroelastic phenomena in the transonic regime has historically been troublesome and requires high fidelity simulation models to obtain accurate predictions. The models are, however, computationally expensive. Traditional uncertainty analysis is therefore not often applied to flutter prediction. The proposed work is to develop computationally efficient methods that reduce the existing computational time limitations of traditional uncertainty analysis. Building upon the successful Phase I demonstration, the coupling of Design of Experiments and Response Surface Methods and the application of robust stability techniques, namely ƒÝ-analysis, will be combined into a comprehensive software toolbox: STI-Aeroservoelastic Robustness Toolbox. STI-ART will have the flexibility to use computational unsteady aerodynamic and structural finite element models from a variety of sources, ranging from simple potential flow models (e.g., doublet lattice methods) and linear structural models to solutions based on modeling of the full Navier Stokes equations and non-linear structural models with many elements.

POTENTIAL NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
NASA is a research leader in aeroelasticity. Recent advances include innovative experimental excitation mechanisms for more accurate vibration data, wavelet analysis for signal processing, stability estimation and nonlinear identification, and robust flutter boundary prediction. The proposed work naturally follows from and compliments these topic areas. The resulting toolbox, STI-ART, will be a valuable asset for the many NASA programs that involve the design, analysis, and test of air vehicles. This is true of both transports and high performance aircraft including those routinely used at NASA DFRC. As part of a research program, all of these aircraft will normally go through analysis, ground loads testing, and flutter testing to ensure safe operations for the given research mission. STI-ART will provide a new means to define the aeroelastic stability flight envelope with greater accuracy to insure safer testing. Furthermore, the toolbox will save analysis time via the more efficient algorithms.

POTENTIAL NON-NASA COMMERCIAL APPLICATIONS (Limit 1500 characters, approximately 150 words)
STI also has long standing relationships with numerous manufacturers of both commercial and military aircraft. This places STI in a unique position to demonstrate this product directly to likely potential industry users. STI-ART will benefit both the aeroelastic assessment of commercial transports and military aircraft that routinely operate near or within the critical transonic speed regime. With the many external and internal load configurations and higher g maneuvering envelope of military aircraft, a tool such as STI-ART has the potential to greatly improve the efficiency of the aeroelastic analysis process. Another post application market for the software package is academia, where the toolbox can provide a user friendly environment to evaluate new CFD/FEM modeling techniques. Academic institutions have been, and will continue to be, major players in the development of new methods and modeling techniques. Thus, STI-ART will provide a means to rapidly assess these new methods as they mature.

NASA's technology taxonomy has been developed by the SBIR-STTR program to disseminate awareness of proposed and awarded R/R&D in the agency. It is a listing of over 100 technologies, sorted into broad categories, of interest to NASA.

Launch and Flight Vehicle
Simulation Modeling Environment
Software Development Environments
Structural Modeling and Tools
Testing Requirements and Architectures

Form Generated on 08-08-08 10:51