Conceptual Design, Structural and Material Optimization of a Naval Fighter Nose Landing Gear for the Estimated Static Loads 2018-01-1911
The landing of naval aircraft on carrier is hard because of touch down, due to the shorter deck than the normal runway. The aircraft hit the deck at more than twice the vertical speed compared to typical landing on decent runway. Naval aircraft land by getting arrested with a metal rope or cable and brakes hard. They may also take-off with a catapult, which is some running device that pulls the nose gear forward at high acceleration. Most of the navy aircraft are equipped with tricycle landing gear mainly to withstand high landing load, ease of landing during cross winds and more stable motion in the ground. The navy Nose Landing Gear (NLG) structural assembly presents complex structural geometry and critical functionalities. The landing gear components are subjected to high static and dynamic loads, so they must be appropriately designed with materials of high mechanical characteristics that meet strength, stiffness and weight requirements. This paper contributes to the shape, size and material optimisation for the NLG of a supersonic naval fighter aircraft. Geometric design and modelling of NLG was done using the software SOLIDWORKS. The identical modal characteristics of the NLG assembly was obtained using ANSYS and by flight test data of an existing aircraft which literally proves the accuracy and suitability of finite element model. Static structural analysis is performed using ANSYS for the critical landing load cases. Iterations including shape, size and material optimisation were done in the NLG; the Reserve factor values are calculated to meet the required static, dynamic and mass characteristics for critical landing conditions.
K Suresh, C Senthil Kumar
Aerospace Systems and Technology Conference