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research-article

Design and folding/unfolding dynamics of an over-constrained airplane?s landing gear with four side stays

[+] Author and Article Information
Camille Parat

Department of Mechanical Engineering, Tsinghua University, Beijing, 1000084, China
pkm16@mails.tsinghua.edu.cn

Zu-Yun Li

Department of Mechanical Engineering, Tsinghua University, Beijing, 1000084, China
lizuyun16@mails.tsinghua.edu.cn

Jing-Shan Zhao

Department of Mechanical Engineering, Tsinghua University, Beijing 1000084, China
jingshanzhao@mail.tsinghua.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4041485 History: Received March 20, 2018; Revised September 09, 2018

Abstract

This paper introduces the design of a specific landing gear retraction system presenting a mechanism with four redundant side stays and examines its dynamic behaviour during the folding and unfolding process. It is the objective of adding three more side stays into the mechanism to reduce the loads at the attachment points in order, for example, to use lighter materials for aircraft frames such as composite materials. First, a design concept of a four-side-stay landing gear retraction system is presented with its particular motion, and its main kinematics parameters are given. Then, the impact of the side stay's redundancy on the mechanism parameters is examined. Because the mechanism is over-constrained, the allowable parameters belong to a specific region of the space called feasible region. Finally, a dynamic analysis of the system is made through the Newton-Euler approach. Numerical simulations indicate that this kind of landing gear retraction system equitably share the loads between the different side stays, reducing the total load at one side stay.

Copyright (c) 2018 by ASME
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