Maximum load calculation at different landing attitudes of a Beamlike main Landing Gear for light Aircraft

Landing gears must be capable of absorbing landing and taxi loads as well as transmit part of these loads to the airframe. the load calculation on landing is one of the first tasks to be achieved in the definition of a landing gear. The loads first depend on the calculation conditions (weight, speed, attitudes), and on the leg geometry. The design loads applied on aircraft are lift load, drag load, side load and torsion load. Lift is the upward force created by the air flow as it passes over the wing, drag is the retarding force (back wardforce) that limits the aircrafts speed, side load is the opposing acting in inward direction of gear leg and torsion load is applied when the air craft structure rotates. The magnitude of these loads depends on the type of airplane as well as on its mission. The reactionforce on strut leg for main and nose under carriage is calculated at different landing attitudes. In this study The analysis is restricted to main wheel layout of tricycle design. Three types of loads must be considered in the layout design of landing gears at three landing attitudes, loads at normal landing, loads with high drag and loads with dynamic breaking. these forces type is considered to make stress analysis for Beamlike Landing for light aircraft (250 Kg) which has tricycle system and main landing composed of two legsmade of carbon/epoxy composite during touchdown time, and these loads are introduced in dynamic program by using LS-prepost at critical landing attitudes.

Keywords:

Center Gravity , Landing Gear , Leg , Backward Force