STRESS AND NORMAL MODE ANALYSIS OF NOSE LANDING GEAR DOOR FOR TYPICAL TRAINER AIRCRAFT

Mechanical design

The typical trainer aircraft have tricycle type of aircraft consisting of one nose landing gear and two main landing gears. To maintain the aerodynamically smooth surface the landing door bay should be covered with doors. The Nose Landing Gear Door is attached to the aircraft fuselage through three hinges which are driven by a hydraulic actuator attached to the central hinge. The NLG-Door structure is made of two aluminum skins between them the stiffener to make it a box structure with help of fasteners. The hinges are machined from aluminum alloy, attached to the structure by steel alloy bolts. The Nose Landing Gear Door is designed to resist the critical aero dynamical loading in different conditions. The Nose Landing Gear Door structural analysis is carried out using MSC/NASTRAN for given boundary conditions and loading. The static strength and fastener check for critical load case is carried out. The normal mode analysis of NLG door is carried out to check the natural frequency of door with respect aircraft structure to avoid resonance.

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