A Mathematical Representation of an Advanced Helicopter for Piloted Simulator Investigations of Control System and Display Variations.
NATIONAL AERONUATICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER
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This report documents a mathematical model of an advanced helicopter the model is suitable for use in controldisplay research involving piloted simulation. The general design approach for the six-degree-of-freedom equations of motion is to use the full set of nonlinear gravitational and inertial terms of the equations and to express the aerodynamic forces and moments as the reference values and first-order terms of a Taylor series expansion about a reference trajectory defined as a function of longitudinal airspeed. Provisions for several different specific and generic flight control systems are included in the model. The logic required to drive various flight control and weapon delivery symbols on a pilots electronic display is also provided. Finally, the model includes a simplified representation of low-altitude wind and turbulence effects. This model has been used in a piloted simulator investigation, recently conducted at Ames Research Center, of the effects of control-system and display variations for an attack helicopter mission. Author