فهرس المقالات landing gear

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  1 - Conceptual Design of Single-Acting Oleo-Pneumatic Shock Absorber in Landing Gear with Combined Method
  Nima Ghiasi Tabari Saeed Mahdiyeh Borojeni
  Landing gear is a structure that is mounted under the fuselage and helps the aircraft in takeoffs and landings. The most important duty of landing gear is the control of vibration exerted on the system through the shock absorber which is a common component to all the la أکثر

  Landing gear is a structure that is mounted under the fuselage and helps the aircraft in takeoffs and landings. The most important duty of landing gear is the control of vibration exerted on the system through the shock absorber which is a common component to all the landing gear. Considering the importance of this issue, the necessity of investigating shock absorber with features such as high efficiency, reliability and maintenance, etc. is undeniable. In the present study In addition to choosing hydro pneumatic shock absorber its relationships arising from oil and gas liquids have been studied. This research was conducted with the aim of reducing the force variations and vibrations, with a focus on liquid gas. Thus, according to the gas laws, initially gas flow in the case of practical modes of isotherms during the taxi and poly trophic during landing has been studied. Considering that in the shock absorber only one mode can be used and Isotherms mode despite less vibration is not responsible for the landing phase and poly trophic mode exerts a lot of vibration on the fuselage, therefore a situation that can meet both needs in a way that have both phases of taxing and landing and at the same time reducing vibrations to be followed is the combination mode that its relation has been extracted at the end. The results of the extracted relations using numerical methods compared with practical results shows that not only the force on the aircraft body but also the vibrations on it have been significantly reduced and improves system performance. تفاصيل المقالة
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  2 - The dynamic response of aircraft landing gear at the moment of landing with regard to smart fluid dampers content MR
  Nima Tabari Saeed Mahdiyeh Borojeni
  Dynamics and vibrations of the aircraft at the moment of impact with the ground is an important issue in aircraft design and its suspension systems. Different models for spring and damper have been used in the design of aircraft. One of the innovative ideas is MR Fluid أکثر

  Dynamics and vibrations of the aircraft at the moment of impact with the ground is an important issue in aircraft design and its suspension systems. Different models for spring and damper have been used in the design of aircraft. One of the innovative ideas is MR Fluid Technology in its design. These shock absorbers are actually created a semi-active control system which by setting a magnetic field, the viscosity of the fluid can be adjusted and led to the desired damper so that the vibrations of the aircraft at the moment of landing reach the minimum amount. To achieve this purpose in the present study at First, a passive shock absorber is modeled and then an MR shock absorber which could provide the necessities of a landing gear system, have been analyzed. Finally, after writing the differential equations, the vibrational charts of the passive mode with semi active have been compared and the results confirmed and confirmed. تفاصيل المقالة