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 The Subsonic Rotary Wing Project conducts research to advance the knowledge and prediction capabilities for rotorcraft, enabling efficient, low-noise, multi-mission flight in support of the Next Generation Air Transportation System, and enhancing the competitiveness of rotary winged vehicles in the civil sector.
Research Overview
Several facets of rotorcraft competitiveness are being pursued through Subsonic Rotary Wing Project research efforts. They are efficiency, including aerodynamic performance and structural weight; productivity, which includes high speed, large payloads, long range, and good maneuverability; and environmental acceptance, particularly regarding noise and handling qualities.
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Propulsion (Engines)
Advanced modeling tools and concepts are essential to allowing an engine/drive system to achieve a significantly larger speed range without sacrificing power and efficiency. These tools and concepts include high-efficiency, multi/variable-speed drive systems, oil-free engine/optimized gearbox systems, and wide-operability engine systems for rotary wing applications.
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Aeromechanics (Active Rotors)
Rotorcraft aeromechanics research extends from first-principles modeling through testing and validation for isolated and multi-disciplinary phenomena. These include aerodynamic performance, air loads and wakes, interactional aerodynamics, rotor loads, vibration, and aeroelastic stability.
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Flight Dynamics and Control (New Instruments and Techniques)
Flight dynamics and control research focuses on modeling, testing, and validating real-time control of integrated, advanced rotorcraft technologies with emphasis on heavy-lift handling qualities and control.
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Materials and Structures
Rotary Wing Project research into materials and structures focuses on rotorcraft-specific issues in crashworthiness, advanced materials for airframes and engines, durability, and damage tolerance.
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Acoustics
Rotorcraft acoustics research focuses on the study and control of source noise, interior noise, gear noise, propagation, and concepts for low-noise operations in the future.
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Experimental Capabilities (Computational Methods)
The development and application of experimental capabilities in rotorcraft is essential for validation of aeromechanics, acoustics, structural response, and propulsion fundamental methods.
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Multi-Disciplinary Analysis and Technology (Computational Methods)
Elements such as Multi-Disciplinary Design & Analysis and Multi-Disciplinary Technical Challenges provide a focal point for the integration of discipline technologies. Analyses development at the system level and demonstrations of integrated components provide a path for maturing technology. The technical challenges force the integration of multiple disciplines, and bring together the analytical methods and experimental validation data that are required to advance the state-of-the-art in a multi-discipline environment.
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