The use of function generation in the real-time simulation of stiff systems
Abstract
A function generation method is proposed to simulate stiff dynamic systems. The equations of the fast subsystem are integrated off-line over a time period that will be employed as the step-size for the on-line integration of the slow subsystem. A time-shift scheme is also introduced in which the frame times for the fast subsystem are shifted half an integration step with respect to the integer frame times for the slow subsystems. Three practical examples show that the function generation method has speed and accuracy advantages over conventional integration of all state equations with a common step size. It is also shown that the time-shift scheme, nonlinear flight control, airframe/landing gear, and tracked vehicle can enhance the accuracy of the function generation method.
- Publication:
-
IN: AIAA Flight Simulation Technologies Conference and Exhibit
- Pub Date:
- 1990
- Bibcode:
- 1990fst..conf..217H
- Keywords:
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- Dynamical Systems;
- Flight Control;
- Function Generators;
- Rigid Structures;
- Systems Simulation;
- Landing Gear;
- Real Time Operation;
- Time Dependence;
- Tracking (Position);
- Engineering (General)