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(1) Accomplish a thorough review of the current ADS-33E-PRF and conduct a comprehensive investigation of existing flight test and simulation data to identify areas which need improvement;

(2) Investigate and evaluate land-and sea-based rotorcraft operational differences and propose new specification criteria for shipboard rotorcraft operations;

(3) develop methods for simulation and/or flight test evaluation of the new specification criteria;

(4) Prototype a new handling qualities evaluation toolkit for shipboard rotorcraft operations that is compatible with industry standard simulation programs, such as FLIGHTLAB or MATLAB/Simulink; and (5) prototype the new toolkit by integrating it with FLIGHTLAB to demonstrate the functionality.

Project 3: Enhanced Rotorcraft Aerodynamic Modules to Support Flight Testing

Summary of Services Performed: Developed advanced rotorcraft aerodynamic modules to significantly enhance and improve the analytical prediction of rotorcraft performance, flying quality, and loads in support of vehicle design, manufacturing, operation, and flight testing.

Progress has been made in developing high fidelity rotorcraft simulation models in order to adequately predict rotorcraft performance, stability, and loads in support of design, operation, and flight testing. Limitations, however, exist in several essential aspects of modeling rotor aerodynamics including blade stall, rotor tip effects, rotor downwash, rotor/airframe interference, and rotor aeroelastic interaction.

This SBIR is dedicated to developing advanced rotorcraft aerodynamic modules to significantly enhance and improve the analytical prediction of rotorcraft performance, stability, dynamic response, and loads to support vehicle design, manufacturing, operation, and flight testing. The research and development focuses on five critical application areas: rotor dynamic stall, modern rotor blade tip aerodynamics, unsteady rotor downwash, low speed and high rate of descent, and rotor unsteady loads prediction. The most significant accomplishment of this research is the development of a modern viscous vortex particle model that revolutionizes the modeling of the complicated rotor wake physics. The viscous vortex particle model addresses the rotor wake transportation physics by considering both the effect of vortex stretching while convecting through the flowfield and the effect of air viscosity for the physical vortex diffusion. The model developed is intended to enhance rotor airloads calculation for both performance and vibration analysis. The development also aims at providing a high fidelity rotor wake vorticity transportation modeling tool for complicated rotorcraft aerodynamic interaction analysis.  

Project 4: Enhanced Rotorcraft Aerodynamic Modules to Support Flight Testing

Summary of Services Performed:  Develop computationally scalable software to utilize massively parallel computer systems to efficiently predict performance and stability in support of flight testing.

This project was to provide computationally scalable tools to predict rotorcraft performance, stability, and control. The ability to efficiently predict vehicle performance, stability, and control from high fidelity computer models would greatly enhance the design and testing process and improved the quality of system acquisition. Through this development, the US Navy Test Pilot School performance, stability, and control test procedures were fully implemented in a high performance parallel computing environment.

Advanced Rotorcraft Technology, Inc.

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