Chyrva O. Models of transient processes in the elements of the bleed air system and the ice protection system of aircrafts for working out their control algorithms

The dissertation is devoted to the creation of a mathematical model for the modeling of transient heat-hydraulic processes of pressure and temperature changes, proceeding with the joint functioning of elements of the bleed air system (BAS) and the ice protection system (IPS) of the aircraft. The following results were obtained: a mathematical model of transient thermal processes occurring in a plate heat exchanger was developed; it was established that simulation of heat processes in a heat exchanger is possible to perform on the basis of calculations only for a part of heat transfer plates; the mathematical model of transient processes occurring in the electropneumatic digital regulator (EPDR) is improved; it was established that in the modeling of transient thermal processes in airplane pneumatic systems, hydraulic processes can be considered as quasi-stationary; It has been established that for a mathematical model of dynamic processes of BAS and IPS, consisting of mathematical models of the basic elements of the systems, being investigated it is possible to perform calculations with different values of the step in time for each element. The developed practical applications for the simulation of transient processes in the BAS and IPS, as well as the dynamic processes in the EPDR, were used in the development process of the control system for the elements of airplane systems.