Abstract
In this paper, nonlinear vibration analysis of a typical aircraft oleo pneumatic landing gear has been done. Mathematical model of the main landing gear is developed, and dynamic equations have been written incorporating the effect of lift force, friction force to study the landing gear behaviour at touchdown condition. The nonlinear effect of stiffness, damping coefficient properties are considered in the analysis. The displacement, velocity, acceleration values are obtained on different landing velocities by numerical simulations using MATLAB/Simulink. Using the same parameters of the aircraft, landing gear and tire, the dynamic analysis was also done in ABAQUS. The results obtained by the nonlinear vibration analysis using the developed model in MATLAB/Simulink have close agreement with the results obtained from ABAQUS. On the basis of the presented model, dynamic simulations of landing for large transport aircraft were performed for different sink velocities. The developed model is also helpful to fine tune the stiffness and damping properties of landing gear in the design stage itself to reduce the replacement / repair cost and increase the life of landing gear assembly.
Highlights
Landing is the most critical operational phase of an aircraft
One dimensional look up table is used for the nonlinear landing gear spring stiffness, tire spring stiffness and damping and the data is entered with reference to the experimental values from [9]
The vertical displacement, velocity responses and total force due to touch down impact of the main landing gear using ABAQUS in time domain is presented in the Figs. 12-14
Summary
Landing is the most critical operational phase of an aircraft. Landing performance of the aircraft can be directly deteriorated by factors such as excessive sink speed, take off speed, ground effects, crosswind, runway unevenness and pilot errors. The Simulink model of landing gear and approach given in this research is helpful to carry out nonlinear vibration analysis by using experimental inputs and to fine tune stiffness and damping values of oleo pneumatic landing gear in the initial design stage itself. This will reduce the vibration levels and settling time of the landing gears to increase the life of landing gear and aircraft structure
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
