Development And Piloted Simulation Testing Of Advanced Response Types For Ship Based Rotorcraft
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Development and Piloted Simulation Testing of Advanced Response Types for Ship-based Rotorcraft
Piloted simulation tests were conducted to develop and evaluate advanced control laws and optimal response types for ship-based rotorcraft. Simulations used the GENHEL-PSU non-linear flight model of the H-60 integrated with the Penn State rotorcraft flight simulator. The simulation includes ship motion, a visual model of a FFG-7 frigate, and the Control EquivalentTurbulence Input (CETI) model for airwake turbulence. The controller uses a Non-Linear Dynamic Inversion (NLDI) scheme to accurately track a variety of response types. An AttitudeCommand / Attitude Hold (ACAH) control mode was used as the baseline control law. Differentvariants of Acceleration Command / Velocity Hold (ACVH) and Translational Rate Command/ Position Hold (TRC/PH) response types were designed to make use of ship deck motion measurements. Filtered deck states are fed into the control laws to command velocity and position relative to the landing spot. Piloted simulation tests were performed for a variety of control configurations with and without ship motion and airwake turbulence effects using a maritime Mission Task Element (MTE). Pilot comments and handling qualities ratings indicated that the best performance wasachieved using an ACVH response type for the pitch axis on approach, which then automaticallytransitions to TRC/PH over the ship deck. Level 1 Handling Qualities were achieved in all testcases when using the optimized ship-relative ACVH/TRC Automatic Transition control mode.Simulation results indicated that it is best to filter out most of the dynamic ship deck motion(primarily ship roll) and to maximize the lateral axis TRC bandwidth.
Scientific and Technical Aerospace Reports
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Advanced Helicopter Cockpit and Control Configurations for Helicopter Combat Missions
Two piloted simulations were conducted by the U.S. Army Aeroflightdynamics Directorate to evaluate workload and helicopter qualities requirements for single pilot operation in a combat Nap-of-the-Earth environment. The single-pilot advanced cockpit engineering simulation (SPACES) investigations were performed on the NASA Ames Vertical Motion Simulator, using the Advanced Digital Control System control laws and an advanced concepts glass cockpit. The first simulation (SPACES I) compared single pilot to dual crewmember operation for the same flight tasks to determine differences between dual and single ratings, and to discover which control laws enabled adequate single-pilot helicopter operation. The SPACES II simulation concentrated on single-pilot operations and use of control laws thought to be viable candidates for single pilot operations workload. Measures detected significant differences between dual-and single-pilot operation and between single-pilot task segments. Control system configurations were task dependent, demonstrating the need for an inflight reconfigurable control system to match the optimal control system with the required task.