MODELS
In this section and the next one will be presented problems regarding derivation of a model that the best fits experiments. The proper choice of a model for the object is a complicated task. For the problem under consideration a model can be written very conveniently as a product of transfer functions of subsystems. The model reconstruction comes down to replacing one of the transfer functions for subsystem by another one. Multiplication of transfer function and input function (pulse) and, next, application of inverse Laplace transform algorithm results in the model solution. If few models are considered the presented procedure is simpler and faster than solution of set of partial differential equations.
Gas flow line through a system was divided into four zones (Fig. 1). The zones are distinguishable on the basis of geometry, function or both. Inner volume of the valves is neglected. Geometry of the apparatus was determined on the basis of technical data presented by manufacturer and previously made investigations [11, 13]. Table 1 gives a complete list of technical data.
Tab. 1. Flow zones description and data.