چكيده به لاتين
Abstract:
With the development of the aviation industry, high-efficiency turbofan engines were well considered. Due to less noise and better efficiency, turbofan engines are common for civil passenger aircrafts. In turbofan engines, a duct is embedded around the core that exhausts some of the fan air to exteriority to increase the efficiency of turbofan engines. In this type of engines some part of the fan air is bypassed oround the core. The bypassed configuration is usful for increasing the engine's thrust, cooling the engine and improving brakes performance during landing. Civil aircrafts require longer runway than military aircrafts and therefore, additional methods are used to reduce the air speed during landing. One of these methods is thrust reverser system of aircraft engines. This system together with air brakes which is mounted on the wings, helps the brake system during landing.
In this thesis, modeling and simulation of thrust reverser system in turbofan engine is performed. Two types of conventional thrust reverser systems, which are used in turbofan engines, are firstly introduced. For the pivoting door type, modeling of thrust reverser mechanism is assembled on the main engine model and the full-scale model of the mechanism in CATIA is then constructed. By linking the designed mechanism to the hydraulic control unit using MATLAB/SimHydraulics, the accuracy of responses is studied by simulation. Finally, in order to minimize the error in pilot command, genetic algorithm is used to find the optimized values of the parameters of the hydraulic circuit obtained from designing the hydraulic control unit.
Keywords: Turbofan engines, thrust reverser, air brakes, hydraulic control unit, genetic algorithm.
