Formulation of seven degree of freedom state space model of aircraft with active landing gear

This paper develops seven degree freedom state space model of aircraft which is equipped with active landing gears in the tricycle pattern. The aircraft bounce, roll, pitch, yaw and three vertical motions are considered for writing dynamic equations by Newtonics method. From these equations, the state space model has been developed to study vibration level parameters such as pitch, roll, yaw, vertical accelerations, displacements, shock strut travel and vertical reactions during take-off, landing and taxing of aircraft with active landing gears. The developed state space model is a generic one can be used to access ride comfort and static strength of active landing gears. This study is also used to analyze the characteristics of active landing gears which covers design spectrum.