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navigation algorithm was designed to generate command inputs for the existing controller. The navigation algorithm includes roll, pitch, and throttle commands.  ART developed the algorithm and the code and integrated to a simulation of the aircraft.  The simulation tested from many input scenarios and delivered to ARI. The effectiveness and robustness of the algorithm and the code were verifies by the completion of successful flight tests.

Project 9: Sensor Visualization

Summary of Services Performed: Develop visualization tool for Apache helicopter electro-optical sensor blind spots

Under contract to the Army’s Aviation Technical Test Center (ATTC) at Ft. Rucker, Al. ART developed a software graphics tool to assist in visualizing the regions in the air and ground space around a helicopter that were not observable by the electro-optical sensors on the helicopter. The cone of observability for each sensor on the helicopter was rendered along with the helicopter and the terrain and the shadow produced by the tail of the helicopter for rearward looking sensors was overlaid on this observability cone. Several different ways of rendering the display were implemented to provide alternate views. In one view the space covered by the sensors was rendered and in another view the space not covered by the sensors was rendered. The observer can set the eyepoint using the mouse to move closer to and further away from the helicopter as well as to translate and rotate in the space around the helicopter to customize the viewpoint. The helicopter can be moved in the space over the terrain from a mission plan to identify the vulnerable areas where ground and air launched missiles may not be detectable. This software has now been deployed in Iraq and Afghanistan to support mission planning for helicopter sorties.

Project 10: CH-53 Aeroelastic Simulation Model

Summary of Services Performed: Develop RCAS model of CH-53 for aeroelastic analysis

ART is supporting Sikorsky Aircraft in modeling the CH-53 helicopter in the RCAS. The focus of this effort is on detailed aeroelastic modeling and running tests under high load factors.  ART provided number of reports analyzing the results of RCAS in comparison with flight tests.  Among them the identification of Floquet Transition Matrix roots and the effects of elastic swashplate on the aeroelastic stability of the rotor can be named.

ART is also supporting an aircraft manufacturer in modeling new coaxial rotor helicopter UAV in RCAS. This manufacturer is using RCAS to analyze the mutual interference of the two rotors.

Project 11: Ducted Fan Model

Summary of Services Performed: Develop a ducted fan model in FLIGHTLAB that includes blade element modeling of the rotor, panel method modeling of the duct, and mutual interaction between the rotor and duct.

The ducted/shrouded fan has become widely adopted in modern rotorcraft as a safe, low noise, and effective anti-torque device. Ducted fans have also found popular applications as the main VTOL lifting

Advanced Rotorcraft Technology, Inc.

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