A user-friendly interactive Turbo Pascal simulation toolkit

Article Abstract:

A Turbo Pascal-based simulator specifically designed for continuous-time models with time delays and hysteretic phenomena is presented and its use illustrated with examples. Delays can be time- and state-dependent. For models with hysteretic (multi-valued) behavior, use is made of a recently introduced mathematical paradigm: the differential automaton. For models defined by differential or delay-differential equations with jumps in the derivatives, the differential automaton formalism can be bypassed by using a switch function to indicate points of low differentiability in the model. The switch function interacts with the simulator to approximate each point of discontinuity where the numerical integrator is to be reinitialized. This interaction, transparent to the user and implemented via side effects of the switch function, replaces the explicit scheduling of state events by the user. For models with time delays, a global approximation is constructed for each delayed state variable. Each global approximation partitioned into sufficiently smooth segments and a smoothness index is associated with the boundary separating any two such segments. Whenever a delay crosses between two adjacent segments, should the value of the smoothness index require it, the time of crossing is approximated iteratively, the numerical integrator is reinitialized, and a new segment is started in the partition. A new segment is also started whenever a switching takes place. The simulator graphical output interface is self-configuring at execution time with respect to the video display adapter-display combination in use. Interactive plotting programs with on-line documentation are also provided to retrieve, then plot, problem data from save files generated during a simulation. (Reprinted by permission of the publisher.)

Magnetic fields, Continuous Simulation, Automata

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Turbo-simulation: a technical note

Article Abstract:

Many reported computer execution-speed benchmarks involve artificial programs exploring the fixed- and floating-point instruction sets. Instead, we report results from two actual dynamic-system simulation problems long used as benchmarks by the simulation community. PHYSBE (Korn and Wait 1978) is a blood-circulation model used in physiological studies, and the Hidinger benchmark (Hidinger 1982) is a practical three-dimensional flight simulation (really a torpedo-autopilot simulation) developed at the Naval Ocean Systems Center. Such programs can give realistic indications of practical results obtainable with different machines. Specifically, we report on a study of measured and predicted simulation speeds of personal computers with speeded-up clocks and of new 32-bit personal computers. This is a glimpse into a new, bright world of very cost-effective simulation; an 80386-387-based PC clone outruns a timeshared VAX 11-780 in the flight-simulation benchmark. (Reprinted with permission of the publisher.)

Benchmarking, Benchmark, Simulation, Mathematics of Computing, Dynamic Systems, Floating-Point Arithmetic, Floating point arithmetic

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SIMTOOLS: a software tool kit for discrete event simulation in Pascal

Article Abstract:

SIMTOOLS is a collection of procedures and functions that allow discrete event simulation programs to be easily developed in Pascal. The package, which implements the event view, has procedures for creating and deleting entities, managing lists or queues, event scheduling and sequencing, system tracing and data collection. It is useful for any model-building effort, but especially those which do not fall neatly into the class of queuing networks where specialized simulation software is available. The advantages of such an approach include the ability to apply top-down design, self-documentation, portability and the fact that the only development software required is the Pascal compiler.

Application development software, Discrete Simulation, Simulation Theory

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