Structure Design And Parameter Optimization Of Magneto-rheological Shimmy Damper

Aircrafts in the process of landing is easily affected by crosswind, the airport road surface and other factors,thus the front wheel shimmy happens. Front wheel shimmy of aircraft has adverse effects on ground handling performance, reliability of landing and ride comfort. Currently mounting a hydraulic anti-swing system on the front landing gear is the most effective control measures of aircraft wheel pendulum vibration. This anti-pendulum measure belongs to passive control and is not able to respond to the front wheel pendulum damping change due to the change of aircraft load.Thus its control effect still has certain improvement and promotion space. Therefore, this paper has designed a new magneto-rheological damper structure based on the principle of MR to improve the existing gear anti-swing performance and to enhance the control effect of the landing gear shimmy.In this paper, a vane type magneto-rheological damper is designed, which is based on the joint operation mode of pressure difference and shear. The magnetic circuit of the shimmy damper is optimized using ANSYS WORKBENCH software. According to the optimization results, the design of structure and the throttle channel size has been completed using CATIA and PROE. What’s more, the drawing for processing has been finished using AutoCAD. Processing, assembly, debugging and testing of the shimmy test device and auxiliary parts has been completed.Damping characteristics test has been carried out on the platform for the vibration reducing device in a landing gear Research Institute,which is on basis of the theoretical analysis. In this process, damping characteristic tests have been realized in different working conditions,such as the situation of zero current, different amplitude and frequency and the condition of different current, different amplitude and frequency.The results show that the damping gap of the magneto-rheological damper can effectively produce anti-swing damping. Namely in the case of the failure of magnetic field control,the damping gap is still able to provide minimum damping. When the current is on,in thesame amplitude and the same frequency, the output damping force of the damper is improved, and can be adjusted in a certain range, which proves the feasibility of the design.