چكيده به لاتين
Investigation of fuel control systems of gas turbine engines is one of the research fields in Systems Simulation and Control laboratory in Iran University of Science and Technology (IUST) and in recent years, a research project entitled "Design and Implementation of a Modern Fuel Control System for a Turboshaft Gas Turbine Engine" has been conducted in this laboratory. In this project, the goal is replacement of current hydromechanical fuel control system by a modern one. In the current system, control algorithm is implemented via mechanical and haydraulic mechanisms which makes the control structure complicated and inhibits further developments. A new structure comprised of Electronic Control Unit (ECU) and Fuel Control Unit (FCU) including a variable displacement pump is suggested. Present dissertation is introduced and conducted in order to design and implementation of the FCU for the mentioned engine.
In the recent years, the load sensing (LS) approach is proposed in industrial hydraulics for adjusting the flow and pressure of variable displacement pumps with the aim of increasing the efficiency. In this method, pressure as the representative of the load is fed back to the pump controller through hydraulic signal. This study suggests utilizing of this method in FCU design and then evaluates the performance against experiments. To this end, firstly, the diagram of the FCU based on LS method is proposed and then the necessary equipments prepared and manufactured. After that, a test bench, including pump driver, tank, piping, pressure transducer, flowmeter, data acquisition, electronic interfaces for signal processing and industrial PC, is developed to evaluate the performance of the proposed FCU based on LS and ELS methods.
In order to design the pressure controller, both classic and intelligent (ANFIS) methods are used and also system identification method employed for modeling the FCU. In addition, the hardware-in-the-loop simulation is performed in order to test the FCU in near real conditions. In the HIL simulation platform, turboshaft engine and ECU are simulated in real-time environment and FCU is placed in the simulation loop as a hardware. Comparing the experiments with model-in-the-loop simulation results verifies the performance of the proposed FCU. Finally, the consumed and lost power of the FCU are compared to that of some conventional FCUs and a significant improvement is shown in terms of efficiency.
