TYPES OF MODELLED SYSTEMS

Rand Model Designer can be used to create models of multicomponent, continuous, discrete and hybrid (continuous-discrete) systems. The continuous behavior of systems is described by first- and second-order differential-algebraic equations (DAE), written in scalar or matrix forms. A system may be written by the user in “free form”,including equations unresolved with respect to derivatives; Rand Model Designer will automatically detect the underlying mathematical structure.
Behavior charts (B-Charts), which are an extension of UML statechart diagrams without orthogonal states, are used for the description of discrete and hybrid behavior. For Discrete actions of B-Charts (entry, exit, transition) a very simple algorithmic language with well-known basic construction is used.
B-Charts can also be used to plan complex event-driven computational experiments.
? system of equations, in free form, is used, for the description of continuous behavior. The free form for planning equations supposes the following possibilities:
? Input of formally decidable, overdetermined or underdetermined systems;
? Use of unordered formulas;
? Use of differential equations, unresolved with respect to derivatives.
Typical applications for Rand Model Designer:
? Modeling of mechanical systems
? Modeling of electric circuits
? Simulation
? Modeling of liquid hydraulic systems
? Modeling of gas systems
? Modeling of control systems
? Modeling of macroeconomic

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