Research Papers

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
e-mail: pkm16@mails.tsinghua.edu.cn

Zu-Yun Li

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

Jing-Shan Zhao

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

1Corresponding author.

Contributed by the Mechanisms and Robotics Committee of ASME for publication in the JOURNAL OF MECHANISMS AND ROBOTICS. Manuscript received March 20, 2018; final manuscript received September 9, 2018; published online November 12, 2018. Assoc. Editor: Guimin Chen.

J. Mechanisms Robotics 11(1), 011001 (Nov 12, 2018) (10 pages) Paper No: JMR-18-1074; doi: 10.1115/1.4041485 History: Received March 20, 2018; Revised September 09, 2018

This paper introduces the design of a specific landing gear retraction system presenting a mechanism with four redundant side stays and examines its dynamic behavior during the folding and unfolding processes. First, a concept design of a four-side-stay landing gear retraction system is presented. To get the particular motion during folding and unfolding, the main kinematics parameters are given. Then, the influence of the side stay's kinematic redundancy on the mechanism parameters is examined. Because the mechanism is overconstrained, the allowable parameters belong to a specific region of the space called feasible region. Finally, a dynamic analysis of the over-constrained system is executed by using the Newton–Euler approach and compliant equations. Numerical simulations indicate that this kind of landing gear retraction system equitably share the loads between different side stays, and therefore, the total load at one side stay is greatly reduced.

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Fig. 1

Structure of Sarrus mechanism (a) unfolded position (b) folded position

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Fig. 2

Landing gear using a four-side-stay retraction mechanism: (a) unfolded position and (b) folded position

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Fig. 3

Front (a) and top (b) view of the retraction system

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Fig. 4

Initial (a) and final (b) positions of one arm of the retraction system

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Fig. 5

Maximum value of cosθ

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Fig. 6

Feasible region of the mechanism depending on the parameters a, b, and xA–xC

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Fig. 7

Dynamic schemes of AB (a) and BC (b) links

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Fig. 8

Free-body diagram of landing gear strut

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Fig. 9

Kinematic curves when the strut goes up and down during two periods

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Fig. 10

Forces and torques when the strut goes up and down during two periods (a) unfolded position, (b) semi-folded position, (c) folded position from isometric view and (d) folded position from top view

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Fig. 11

Views of the folding process: (a) unfolded position, (b) semifolded position, (c) folded position from isometric view, and (d) folded position from top view



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