Author(s): Sheronosova Tatiana
Linked Author(s):
Keywords: Pipes; Flows; Hydraulics; Automatic control; Valve; Pump; Power plant; Numerical simulation
Abstract: The paper is devoted to elaboration of a technique of«direct»mathematical modeling of automatic control units in the systems of technological pipelines of thermal and atomic power stations, hydrodrivers and so on. The problem of simulation of disturbances is considered. For the complete description of disturbances it is necessary to simulate external parts of system, i. e. all considered system wholly. However it is possible to isolate the unit of automatic regulation in a separate subsystem if to set the disturbances from external environment as incoming Riemann’s invariants. The offered approach is illustrated for the system of pressure automatic control in a return pipeline of a heat supply system. For this purpose the mathematical model of the actuator valve was elaborated. It allows to watch the dynamics of its functioning evidently. The mathematical model represents a system of the differential and algebraic equations, which are solved numerically by finite difference method. The results of accounts of system reaction on disturbances of various amplitude and duration are demonstrated. The contribution of the various factors (friction, inertness) to dynamics of process is specified. The results may be applied in accounts of thermohydraulic parameters of complicated pipe systems in large heat and power objects.
Year: 1999