Bifurcation analysis of dual-sidestay landing gear locking performance considering joint clearance

Xu, Kui; Yin, Yin; Yang, Yixin; Nie, Hong; Wei, Xiaohui

doi:10.1016/j.cja.2021.08.038

Cited by 9 publications

(14 citation statements)

References 19 publications

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“…The shimmy damper and the strut's torsional stiffness are connected in parallel, and the parallel stiffness is then connected in series with the sliding tube's torsional stiffness. Equation (2)(3)(4)(5)(6)(7)(8)(9)(10)(11) displays the analogous relationship between the torsional damping of the two models. The sliding tube damping, the shimmy damper damping, and the main fitting damping are coupled in series.…”

Section: Mathematical Modeling Of Three Torsional Degrees Of Freedom ...mentioning

confidence: 99%

“…The gyroscopic torque generated by changes in aircraft sliding speed, structural lateral bending angle speed, and sliding tube torsional angular speed are represented by letters 2 V I R  in equations (2-3) and (2)(3)(4), respectively. Equation (2-4) embodies the linked moments of the two modes, sliding tube and structural lateral bending, as seen in equation (2)(3)(4)(5)(6), where g l is the distance from the nose landing gear connection point to the ground measured from the fuselage.…”

Section: Mathematical Modeling Of Three Torsional Degrees Of Freedom ...mentioning

confidence: 99%

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Influence of structural torsional degree of freedom on nose landing gear shimmy

Ding,

Feng,

Liu

et al. 2023

Preprint

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The structural characteristic of combining a maneuvering mechanism and a shimmy damper into a single component is present in the nose landing gear of large civil aircraft. Establishing a more accurate shimmy model based on this property is crucial. The three torsional degrees of freedom shimmy of the nose landing gear was mathematically and physically modeled. The time domain curve, spectrum diagram, and bifurcation diagram were used to compare the three torsional degrees of freedom shimmy model and the single torsional degrees of freedom shimmy model. The three-torsional freedom model predicts a greater amplitude and a longer convergence time in comparison to the findings of the single-torsional freedom model. The sliding tube's torsional vibration frequency falls from 10.9Hz to 8.1Hz in the three-torsional degree-of-freedom model, while the structure's lateral vibration frequency stays the same. The three-torsional freedom model predicts a decrease in the region of stable and torsional shimmy and an increase in the area of lateral and quasi-periodic shimmy. The amplitudes of all degrees of freedom in the three torsional degrees of freedom model, regardless of whether it is torsional or lateral, are greater than those in the single torsional degrees of freedom model when the vertical load is fixed. By increasing the torsional degrees of freedom of the shimmy damper and the main fitting, the inertia, stiffness, and damping in the torsional direction are redistributed in the three-torsional shimmy vibration model, which reduces the stability of the system.

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Section: Mathematical Modeling Of Three Torsional Degrees Of Freedom ...mentioning

confidence: 99%

Section: Mathematical Modeling Of Three Torsional Degrees Of Freedom ...mentioning

confidence: 99%

Influence of structural torsional degree of freedom on nose landing gear shimmy

Ding,

Feng,

Liu

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Additional sidestay links are generally installed at the reinforced frame of the aircraft fuselage; these links can effectively share the load borne by the wings and optimize the load transfer of the main landing gear [10]. Moreover, this approach can significantly reduce the vertical space, solving the problem that the planar retraction mechanism has difficulty in retracting the landing gear along a complex trajectory into a narrow space [11]. Moreover, this complex retraction leads to some new problems.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the complete locking performance of the landing gear is strongly influenced by the position of the sidestays. Xu et al [11] conducted a bifurcation analysis on the configuration, cooperative locking, and parameter impact of the 3D DSS retraction mechanism, solving the kinematic problem of the two sidestay links interfering with each other during locking process. However, the current research is generally based on the full rigidity mechanical model of ideal articulation.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Synchronized Locking Dynamic Characteristics of a Dual-Sidestay Main Landing Gear Retraction Mechanism

Zhang,

Wu,

Zhu

et al. 2024

Aerospace

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As an advanced design technology for large wide-body airliners, the three-dimensional (3D) dual-sidestay (DSS) landing gear retraction mechanism can share the ground loads transferred by the landing gear, reducing the load on the wings. However, the addition of a strut system may significantly impact the synchronous locking performance of the landing gear with extremely high sensitivity. To study this impact pattern, both a rigid–flexible-coupling dynamic model of DSS landing gear considering joint clearance and node deviation and a synchronous locking test platform are established in this paper, and the simulation model is validated through the experimental results. Based on the simulation model, this paper conducts a detailed study on the influence of different node deviations and joint clearance on the synchronous locking dynamic characteristics of the DSS landing gear. The results show that, as the node deviation increases, the locking of the lock link gradually lags until one side cannot be fully locked; the structural clearance has a smaller impact on the synchronous locking of the landing gear. The feasible region of parameters satisfying the synchronous locking condition is given, which provides a basis and support for the parameter design of dual-sidestay retraction mechanisms.

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“…The vibration and noise caused by joint clearance and its wear directly affect the stability and service life of the NLG. Especially after long-term work, the joint clearance increases with the deepening of wear, and these problems are more prominent [29,30]. The transmission characteristics of each joint of the NLG are different, and little is known about the influence of different joint clearance on shimmy.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Joint Clearance Effects on the Shimmy of Nose Landing Gear

Jiang,

Feng,

Liu

et al. 2023

Aerospace

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Through the establishment of a three-dimensional joint clearance model, the effects of joint clearances at different positions on shimmy stability are evaluated. In this paper, considering the radial, axial and coupling characteristics of joint clearance, the shimmy multibody dynamics (MBD) model is applied to different joints in the nose landing gear (NLG) transmission system. It is proposed to evaluate the influence of joint clearance on shimmy from two aspects of position factor and wear factor. The study found that different joint clearances have different effects on shimmy: the joint clearance between the NLG and fuselage has little influence on shimmy; the larger axial clearance of upper and lower torque link joint will cause the shimmy of the NLG, but the radial clearance has no effect on shimmy; while the joint clearance between turning sleeve and upper torque link, lower torque link and piston only works in the axial and radial coupling. The reasons for the different influence characteristics of each joint space are analyzed. Consequently, studying and summarizing the influence of different clearance on shimmy is of great significance for the design and maintenance of the NLG joints.

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Bifurcation analysis of dual-sidestay landing gear locking performance considering joint clearance

Cited by 9 publications

References 19 publications

Influence of structural torsional degree of freedom on nose landing gear shimmy

Influence of structural torsional degree of freedom on nose landing gear shimmy

Analysis of the Synchronized Locking Dynamic Characteristics of a Dual-Sidestay Main Landing Gear Retraction Mechanism

Evaluation of Joint Clearance Effects on the Shimmy of Nose Landing Gear

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