SAE Aerospace Control and Guidance CommitteeMeeting No. 96

Hilton Head SCOct. 19-21, 2005

Ron Hess

Dept. of Mechanical and Aeronautical EngineeringUniversity of California

Davis, CA

Outline

• A simplified technique for modeling piloted rotorcraft operations near ships

• A simplified approach for modeling pilot pursuit control behavior in multi-loop flight tasks

• Certification and design issues for rudder control systems in transport aircraft

• Nonlinear inversion control for a ducted fan UAV

• Design, construction and testing of a UAV for remote sensing

A Simplified Technique for Modeling Piloted Rotorcraft Operations Near Ships

Research supported by Phase II SBIR to Robert Heffley Engineering: Pilot Behavioral Modeling for Flight Operations Near Ships; Naval Air Warfare Center, Patuxent River, MD

A Simplified Technique for Modeling Piloted Rotorcraft Operations Near Ships

• Aircraft shipboard operations, fixed or rotary wing, can be potentially hazardous to personnel in the vehicle and on the flight deck

• Determining suitability of proposed flight control systems for shipboard operations through analysis and computer simulation is an important, if not critical design challenge

• Computational requirements for high-fidelity modeling of the near-ship environment may inhibit its use as a preliminary assessment tool for the flight control/handling qualities engineer

• Simplified approaches to this complex modeling problem may be useful

A Simplified Technique for Modeling Piloted Rotorcraft Operations Near Ships

• Ship motion from closed-form expressions

• Atmospheric turbulence modeling from scaled METS (Mixer-Equivalent Turbulence Simulation)

• Pilot model selection

• Handling qualities level prediction

• AIAA Paper No. 2005-6030, AIAA Atmospheric Flight Mechanics Conference and Exhibit, San Francisco, CA 15-18 August, 2005

A simplified approach for modeling pilot pursuit control behavior in multi-loop flight tasks

Research supported by Phase II SBIR to Robert Heffley Engineering: Pilot Behavioral Modeling for Flight Operations Near Ships; Naval Air Warfare Center, Patuxent River, MD

A simplified approach for modeling pilot pursuit control behavior in multi-loop flight tasks

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A simplified approach for modeling pilot pursuit control behavior in multi-loop flight tasks

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Hover repositioning task UCE = 1 UCE = 3

Certification and design issues for rudder control systems in transport aircraft

Research Supported by: FAA Hughes Research Center; Certification Standards for Transport Aircraft

From NTSB recommendations regarding AA 587 accident

• Modify FAR Part 25 standards to include a certification standard that will ensure safe handing qualities in the yaw axis throughout the flight envelope, including limits for rudder pedal sensitivity.

• After certification standard established, review designs of existing airplanes to determine if they meet the standard…determine if the airplanes would be adequately protected from the adverse effects of potential aircraft-pilot coupling (APC) after rudder inputs at all airspeeds.

Certification and design issues for rudder control systems in transport aircraft

Rudder Pedal Force/Feel System Characteristics

Certification and design issues for rudder control systems in transport aircraft

Pilot modeling results

System A System B

highly nonlinear force/feel more linear force/feel

AIAA Paper No. 2005-6035, AIAA Atmospheric Flight Mechanics Conference and Exhibit, San Francisco, CA 15-18 August, 2005

Nonlinear inversion control for a ducted fan UAV

Research Supported by: Army Aeroflightdyamamics Directorate, NASA Ames; MS Student: Christina Spaulding (MS 2005)

NASA lead researchers: Dr. Mark Tischler, Mohammadreza Mansur, Dr. Jack Franklin

Nonlinear aero model of 29 inch diameter UAV

Nonlinear inversion control for a ducted fan UAV

CONDUIT used for outer-loop design

Nonlinear inversion control for a ducted fan UAV

Velocity command-following performance

AIAA Paper No. 2005-6231, AIAA Atmospheric Flight Mechanics Conference and Exhibit, San Francisco, CA 15-18 August, 2005

Design, construction and testing of a UAV for remote sensing

Research Supported by: University of California, California Space Institute (Two year grant)

• Participants: J. J. Chattot (Team Lead)

R. Davis (Propulsion)

M. Hafez (Aerodynamics)

R. Hess (Guidance and Control)

S. Joshi (Guidance and Control)

V. La Saponara (Structures)

C. van Dam (Aerodynamics/Performance)

• Design just getting underway