Journal of Aeronautical Engineering

Journal of Aeronautical Engineering

Optimum design of MR oleopneumatic shock absorber for airplane landing gear

Document Type : Original Article

Authors
Alireza Pourmoayed 1
Keramat Malekzadeh Fard 2
Mohammad Ali Ranjbar 3
1 Department of Mechanical Engineering, Khatmol Anbia Air Defense, Tehran, Iran
2 Department of Aerospace Engineering, MalekAshtar University of Technology, Tehran, Iran
3 Air Defence University
10.22034/joae.2020.137400
Abstract
In the present study, optimum design of a semi-active oleopneumatic shock absorber equipped with MR valve in order to use in the airplane main landing gear will be discussed. In the first phase of design, based on the force-displacement diagram design criterion and considering a maximum value of gas pressure, dimensions of the main cylinder, piston cylinder, orifice width, valve radius, and length are determined in the passive state of shock absorber. In the following and in the second phase of design, by the use of obtained information from the first phase, and according to performance criteria of MR valve and the principle of using the maximum working capacity of MR fluid without magnetic saturation of MR valve, the optimum design of MR valve in the constant volume and the active state of shock absorber will be done. In the design procedure, the effect of geometric parameters on shock absorber force is also examined and will be shown that orifice width is the most effective and sensitive geometric parameter in this regard. Optimum design of airplane main landing gear MR shock absorber based on performance criteria of MR valve and investigating the effect of MR valve parameters on shock absorber forces and magnetic properties of valve are the novelties of this research. Due to the importance and the application of MR shock absorber, the results and the achievements of the present study can be used in other industries, in addition to the airplane landing gear as a specific case study.
Keywords
Oleopneumatic shock absorber
MR shock absorber
Airplane landing gear
Optimum design
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Journal of Aeronautical Engineering
Volume 22, Issue 2
December 2020
Pages 171-196

  • Receive Date 01 August 2021
  • Revise Date 23 August 2021
  • Accept Date 27 August 2021