ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Effect of Shock Strut Flexibility on Landing Gear Shock Absorber Friction Force
Received date: 2013-06-24
Revised date: 2014-02-27
Online published: 2014-03-17
Supported by
National Natural Science Foundation of China (51105197, 11372129, 51305198); The Priority Academic Program Development of Jiangsu Higher Education Institutions
In order to provide a new modeling method of the landing gear shock absorber friction force and offer technical advice about shock absorber binding, influence of the shock strut flexibility on landing gear shock absorber friction force is researched. With the use of high-strength steel, stiffness becomes an ever more serious issue. Traditional rigid shock strut presupposition may not be suitable for analysis of new types of aircraft landing gear. To address the binding occurring to an unmanned aircraft, a landing gear shock absorber friction force model is established with the shock strut flexibility taken into consideration. The friction force under the most serious case is calculated, and is compared with the force calculated without taking shock strut flexibility into account. The study shows that in the case when the shock strut flexibility is considered and under the ideal planar slide constraint, the friction force is 6 times that of the rigid model. The friction force thus can lead to shock absorber binding. Furthermore, the actual constraint forms are analyzed, and the coefficient of bearing deformation consistency is presented. The relationships of this coefficient with the friction force and shock absorber binding are analyzed. The influence is studied of the flexibility of the shock strut inner cylinder and outer cylinder on the value of the friction force. The study shows that the shock absorber will get stuck as the coefficient of bearing deformation consistency becomes no less than 0.53. Decreasing the inner cylinder's flexibility or increasing the outer cylinder's flexibility can decrease the shock absorber friction force.
Key words： landing gear; shock absorber; shock strut flexibility; friction force; binding
WEI Xiaohui , SONG Xiaochen , NIE Hong , YAN Xiaofeng , LI Lirong . Effect of Shock Strut Flexibility on Landing Gear Shock Absorber Friction Force[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(6) : 1604 -1611 . DOI: 10.7527/S1000-6893.2014.0003
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