An Integrated, Modular Simulation System for Education ... - Cal Poly

GeneralUsing multi processor Silicon Graphics workstations and the built in TCP/IP andshared memory capabilities native to Unix, simulations can be performed on a singlemachine doing complex rotor state calculations using a joystick and one or more screens.Simulator cab motion, more complex graphics, complex simulation of components suchas powerplants or navigation aids (e.g. inertial navigation) all require multiple computers.Cal PolyThe software available for the PhEagle I lab include a three axis transfer functionmodel, a state space model, and a basic nonlinear 6 DOF rigid body model.Transfer FunctionA stand-alone three-axis transfer function model was created to demonstratetransfer function models as a means of describing a dynamic system. The model was alsoto be used for handling qualities research [Ref. 16] to provide a simple model with knowndynamics to vary control stick force shaping and processing time delay. The transferfunction model uses first and second order differential equations transformed through aLaplace transform to the frequency domain [Ref. 33]. A transfer function is a ratio ofoutput to the input of a system over a range of frequencies. Using literal factorsapproximations for the pitch, roll, and yaw axes, a simple model of the dynamics of anaircraft can be rapidly synthesized [Ref. 32]. The first order system models an overdampedspring damper system that provides a variable delay to the system. A first orderfunction models the roll axis of a conventional aircraft. The second order system acts likea spring damper system with the natural frequency and damping ratio variable. Thesecond order system is used to model the short period oscillations of an aircraft slongitudinal (pitch) and lateral (yaw) axis. Each axis is isolated dynamically providing23