Modern aircraft landing gears consist of many complex, nonlinear subsystems including the landing gear structure, shock absorber, hydraulic steering, braking, antiskid system and tires. SDI Engineering has developed a landing gear modeling and simulation software tool called GearSim that includes detailed models of the relevant landing gear subsystems, including the shock absorber, tire and leg flexibility, as well as aeroservoelastic modeling capability for the airframe and the flight control system. A realistic model of a commercial transport airplane was built with GearSim to study the effects of aircraft and landing gear subsystem dynamics on landing loads.
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