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Landing Gear Theory Essay

3508 Words15 Pages

RELIABILITY STUDIES ON THE INFLUENCE OF JOINT CLEARANCE ON THE KINEMATICS OF THE NOSE LANDING GEAR MECHANISM OF A TRANSPORT AIRCRAFT USING CONTACT THEORY

ABSTRACT Contact between two objects is an important facet in multibody dynamics. It is a discontinuous, non-linear phenomenon and consequently it requires iterative simulations. The paper presents the reliability evaluation of the retraction landing gear mechanism by three contact models Viz. Impact Function Model, Coefficient of Restitution Model and Clearance Link Model. The simulations have been performed using the standard commercial multibody dynamics software ADAMS. The precision of these simulations depends on user-defined parameters like stiffness, Damping, Penetration Depth, Force exponent, Penalty and Restitution Coefficient that impacts the overall reliability of the mechanism. The optimal value of these parameters have been obtained by an optimization process using Design of Experiments tool available in ADAMS to match with the nominal values without any clearance.. The overall reliability of the mechanism has been evaluated at different instants of the retraction cycle by using Response Surface Based Monte Carlo Simulation and Direct Monte Carlo …show more content…

The procedure adopted has been by using the design of experiments approach with three level full factorial designs by varying the Joint Clearance. For a three level, one variable full factorial design 31=3 runs have to be performed. This gives three output configurations for each angular step considered for the simulations. The response surface has been fitted accordingly from the output responses obtained for the three points. A second-order model has been found to be accurate enough in approximating a portion of the true response surface with parabolic curvature, which is expressed

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