METERING PIN DIAMETER OPTIMIZATION OF AN AIRCRAFT LANDING GEAR SHOCK ABSORBER

One of the most important components an aircraft is landing gear. In today`s modern gears, mostly oleo-pneumatic shock struts are used. Analytically, gear can be modeled as a mass-spring-damper system. The model used in study included such strut, tire and wheel. Furthermore, tapered metering pin was added to order control area orifice by which hydraulic oil flows during act impact force. Landing design usually aims minimize two elements vertical acceleration displacement mass. force indicated acceleration. Displacement absorber should minimum decrease size, weight space needed for An optimization problem defined those parameters within range given inputs. For this purpose, composite objective function created include optimize output simultaneously with equal weight. Among many inputs, hub tip external diameters were selected variables other inputs kept constant. study, genetic algorithm method coupled Matlab/Simulink model. After some iterations, solution converged determine where mass minimized objective. At end process, reduced from 2.433 g 1.7828 (-36.47%) constraint 2 maximum. X1 increased 0.2982 m 0.3682 (+23.47%) acceptable limit 0.4 m.