Strength Optimization of Landing Gear's Leg for Aerial Vehicle using ANSYS Solver

K Rama, Krishna Tech, S Chaithanya, A Bhanu Prasanna
unpublished
The landing gear is a structure that supports an aircraft on ground and allows it to taxi, takeoff , and land. In fact, landing gear design tends to have several interferences with the aircraft structural design. Present research is going in the weight of landing gear has become an important factor and efforts are being made to reduce the weight of the aircraft landing gear to consequently increase the payload. This thesis presents an approach to optimize the weight of landing gear's leg for an
more » ... g gear's leg for an Un-manned Aerial Vehicle (UAV) made of aluminum ASM 7075 material adopted from aerospace specification materials. A cantilever type conventional landing gear's leg is chosen for analysis. The model is drafted in CATIA V5, meshed in ANSYS Mesh tool and software and analysis is carried out in ANSYS solver. Loads are applied through a rigid boundary condition & screw boundary connection. First the structural behavior of the component is analyzed by performing static and random analysis when subjected to behavior constraints. Optimization process is carried out iteratively to optimize the structural parameters of the component. Weight of landing gear's leg is optimized using ANSYS optimization and less stress concentrated areas in design is identified using ANSYS shape optimization module. A new optimized landing gear's leg with reduced weight is modeled with same material properties, boundary conditions and design loads. The behavior of component is checked using structural analysis which includes static and random vibration (PSD) analysis. 1.0 INTRODUCTION: Each type of aircraft needs a unique landing gear with a specific structural system, which can complete the demands described by unique characteristics associated with each air craft. The landing gear is the component that supports an aircraft and allows it to move on the ground. Conventional landing gear is one of the types among the landing gear where the gear legs are arraigned in tricycle fashion. The tricycle arrangement has one gear strut either back or front and two main gear legs. The main gear leg comprises a simple single piece of aluminum alloy spring leaf type which is bolted at the bottom of the fuselage. The design and development of a landing gear encompasses several engineering disciplines such as structures, mechanical systems, aerodynamics, material science, and so on. The conventional landing gear design [1] and development for aerospace vehicles is based on the availability of several critical components/systems such as forgings, machined parts, mechanisms, sheet metal parts, electrical systems, hydraulic systems, and a wide variety of materials such as aluminum alloys, steel and titanium, beryllium, and polymer composites. As the science of materials is progressing continuously it is natural that the use of new materials will replace older designs with new ones. Energy absorption and crashworthy features are the primary design criteria that govern the development of landing gears. The impact force on landing gear has been discussed by Flugge [2] considering both the landing and taxiing impact forces and neglected the drag force acting on it. The crack generation in the landing gear components was observed by Fujimoto [3] and the basic causes of damage were found to be processing operations, latent
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