基于分岔理论的起落架撑杆式锁机构设计

doi:10.7527/S1000-6893.2020.23958

Abstract

Abstract: An analytical method is presented to study the performance of a locking mechanism using bifurcation theory. Taking the combined uplock/downlock mechanism of a nose landing gear as the research object, the effects of the retractable and unlocked actuator on the stability of the mechanism are studied by numerical continuation based on the bifurcation theory. The correspondence relationship between bifurcation points and the locking/unlocking behavior in bifurcation diagrams is explained. According to different unlock actuator forces, five unlocking states of the lock mechanism are divided for the up/down unlocking process. The loci of the unlocking/locking bifurcation points are obtained through numerical continuation. After defining the critical unlocking force/angle according to the cusp bifurcation points of the loci, we analyze the influence of spring stiffness, original length and installation position on the preceding variables. Finally, optimization of the critical up unlocking force is conducted with a constraint on the initial over-center angle. The results show that bifurcation analysis can quickly and comprehensively grasp the changing trend of dynamic characteristics with different parameters, exhibiting certain advantages in analyzing the performance of locking mechanism and guiding the preliminary design of parameters.

Key words: landing gears, strut locking mechanism, bifurcation theory, numerical continuation, stability

CLC Number:

V226

YANG Yixin, YIN Yin, NIE Hong, WEI Xiaohui. Strut locking mechanism design for landing gear based on bifurcation theory[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020, 41(11): 223958-223958.

References 25

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Strut locking mechanism design for landing gear based on bifurcation theory

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