Shimmy dynamics in a dual-wheel nose landing gear with freeplay under stochastic wind disturbances

Du, Xiaolei; Xu, Yong; Liu, Qi; Liu, Chongchong; Yue, Xiaole; Liu, Xiaochuan; Kurths, Jürgen

doi:10.1007/s11071-023-09182-3

Cited by 4 publications

(2 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The role of x 0 from other neurons’ external stimulus ( Li et al, 2024b ; Li et al, 2024a ; Du et al, 2024) is the same as I ext when other parameters are fixed. When the external stimulation of other neurons contributing to the ith neuron is weak, system (4) (the Hamiltonian energy, change in Hamiltonian energy, and membrane potential) is stable ( Figure 4A ).…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Hamiltonian energy in a modified Hindmarsh–Rose model

Zheng,

Xu,

Shen

2024

Front. Netw. Physiol.

Self Cite

View full text Add to dashboard Cite

This paper investigates the Hamiltonian energy of a modified Hindmarsh–Rose (HR) model to observe its effect on short-term memory. A Hamiltonian energy function and its variable function are given in the reduced system with a single node according to Helmholtz’s theorem. We consider the role of the coupling strength and the links between neurons in the pattern formation to show that the coupling and cooperative neurons are necessary for generating the fire or a clear short-term memory when all the neurons are in sync. Then, we consider the effect of the degree and external stimulus from other neurons on the emergence and disappearance of short-term memory, which illustrates that generating short-term memory requires much energy, and the coupling strength could further reduce energy consumption. Finally, the dynamical mechanisms of the generation of short-term memory are concluded.

show abstract

Section: Numerical Results and Discussionmentioning

confidence: 99%

Hamiltonian energy in a modified Hindmarsh–Rose model

Zheng,

Xu,

Shen

2024

Front. Netw. Physiol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Variations in different design parameters-namely, the energy absorption coefficient of the shimmy damper and the location of the gravity center of the landing gear-were studied. Both increasing the torsional damping and optimizing the stiffness distribution of the NLG can effectively improve the anti-swing performance, preventing the shimmy [23][24][25]. Several instability suppression strategies have been investigated in recent decades by developing multi-disciplinary formulations and the innovative design of active vibration absorbers [26][27][28][29][30][31][32][33].…”

Section: Introduction 1vibration Characterization In Aerospace Fieldmentioning

confidence: 99%

Vibration Qualification Campaign on Main Landing Gear System for High-Speed Compound Helicopter

Chiariello,

Carandente Tartaglia,

Arena

et al. 2024

Aerospace

View full text Add to dashboard Cite

Vibrations in helicopters have strong implications for their performance and safety, leading to the increased fatigue of components and reduced operational efficiency. As helicopters are designed to land on several types of surfaces, the landing gear system dissipates the impact on the ground and maintains stability during landing and take-off. These vibrations can arise from a variety of sources, such as aerodynamic loads, mechanical imbalances, and engine instabilities. In the present work, the authors describe the vibration qualification process of the main landing gear tailored to fast helicopters within the Clean Sky 2 Racer program. The method entails devising preliminary load sets that deform the structure in its key excited mode shapes to assess stresses and address the experimental campaign. A full-scale prototype model is then tested for sine sweep and random vibrations as per the Airbus Helicopter requirements in order to reach the final qualification and acceptance stage. Although the discussion centers on a landing gear structure, the described process could be extended to other critical equipment as well.

show abstract

Dynamical Behaviours of the Nose Landing Gear with Freeplay and Stochastic Disturbance

Du,

2024

Lecture Notes in Mechanical Engineering

View full text Add to dashboard Cite

Shimmy dynamics of a dual wheel nose landing gear system with torsional freeplay under stochastic lateral disturbances is studied. Dynamic characteristics of the deterministic case are numerically analyzed, especially the shimmy of the landing gear through bifurcation analysis. Meanwhile, the influences of the freeplay nonlinearity on shimmy behaviours are examined in detail. Impacts of stochastic lateral disturbances on the shimmy of the landing gear system are performed via time history and recurrence plots. Our results show that the interaction between the freeplay nonlinearity and the random load induces a significant reduction in the critical shimmy velocity, which has an adverse impact on the stability of the nose landing gear of an aircraft.

show abstract

Shimmy dynamics in a dual-wheel nose landing gear with freeplay under stochastic wind disturbances

Cited by 4 publications

References 39 publications

Hamiltonian energy in a modified Hindmarsh–Rose model

Hamiltonian energy in a modified Hindmarsh–Rose model

Vibration Qualification Campaign on Main Landing Gear System for High-Speed Compound Helicopter

Dynamical Behaviours of the Nose Landing Gear with Freeplay and Stochastic Disturbance

Contact Info

Product

Resources

About