MATLAB SIMEVENTS RELEASE NOTES Betriebsanweisung PDF herunterladen (Seite 64)

2 Building Simple Models with SimEvents Software

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Event-Based and Time-Based Dynamics in the Simulation

In the abs_hybrid model, the time-based dynamics of the braking system coexist with

the event-based dynamics of the network delay subsystem. When you run the simulation,

the solver and the event calendar both play a role. Upon major time steps of the solver,

the simulation solves the ordinary differential equations that represent the dynamics of

the braking system. Solving the event-based dynamics entails scheduling and processing

events, such as service completion and entity generation, on the SimEvents event

calendar. Because the model uses a variable-step solver, when events occur in the

discrete-event system, the solver has a major time step.

To learn more about:

• Solvers for SimEvents models, see “Solvers for Discrete-Event Systems”.

• Types of events in the SimEvents software and the role of the event calendar, see

“Events in SimEvents Models”.

In this model, time-based blocks interact with event-based blocks at the input and

output of the Network Delay subsystem. At each major time step of the solver, the ABS

Controller block updates the value at the input port of the Network Delay subsystem.

The Set Attribute block, which is event-based, uses this value upon the next entity

arrival at the Set Attribute block. Such entity arrivals occur at times 0, 1, 2, and so on.

When an entity completes its service, the entity arrives at the Get Attribute block, which

is event-based. This block updates the value at the output port of the subsystem. The

Brake System Dynamics block, which is time-based, uses this value upon the next major

time step of the solver.

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MATLAB SIMEVENTS RELEASE NOTES Betriebsanweisung Seite 64