TECHNIQUE FOR EFFICIENT SIMULATION OF LARGE DYNAMIC SYSTEMS.

Simulation of physical systems frequently involves initial value problems whose solutions exhibit widely different dynamic properties. A scheme is presented in which a system may be partitioned into two systems, one containing the slowly varying modes and the other containing essentially the rapidly varying modes. A multirate integration method is presented to integrate this partitioned system, resulting in considerable computer time savings. An example of an autopilot model is used to illustrate the scheme.