Abstract
In earlier publications of landing gear shimmy analysis, efforts have concentrated on predicting the onset of shimmy instability and investigating how to stabilise shimmy-prone landing gears. Less attention has been given to the improvements of shimmy performance for a gear that is free from dynamic instability. This is the main interest of this work. We investigate the effectiveness of a linear passive mechanical device that consists of springs, dampers and inerters on suppressing landing gear shimmy oscillations. A linear model of a Fokker 100 main landing gear and two configurations of candidate shimmy suppression device have been presented. Considering the physical shimmy motions, time-domain optimisation of the parameters in the shimmy suppression devices, using a cost function of maximum amplitude of gear torsional-yaw motion, has been carried out. The performance advantage of a shimmy suppression device incorporating inerter has been presented.
Highlights
One of the essential design requirements for aircraft landing gear is that the gear should be free from excessive vibrations and dynamic instabilities, such as shimmy the topic of this paper
In landing gear shimmy analysis, most efforts have concentrated on predicting the onset of shimmy instability and investigating how to stabilise shimmy-prone landing gears
Less attention has been given to the improvement of shimmy performance for a gear that is free from dynamic instability, which is the purpose of this work
Summary
One of the essential design requirements for aircraft landing gear is that the gear should be free from excessive vibrations and dynamic instabilities, such as shimmy the topic of this paper. Since the elastic tyres play an important role in vehicle shimmy analysis, significant efforts have been made to model the tyre dynamics, including the point contact method proposed by Moreland [3] and the stretched-string tyre model by Von Schlippe and Dietrich [4]. Some linear or quasilinear methods are still used in landing gear shimmy analysis, especially efficient on small amplitude shimmy vibration cases. We investigate the possibility of improving landing gear shimmy performance using a passive device consisting of springs, dampers and inerters. In [19], Xin et al concluded that the application of inerter may destabilise the system if the gear geometry parameters were not chosen appropriately They investigated the effects of inerter on the shimmy performance considering different linear landing gear models.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
