Operation features of double-chamber shock-stuts with two kinds of structure

Аuthors

Ovchinnikov S. Y.

MIG corporation, 6, Leningraskoe shosse, Moscow, 125171, Russia

Abstract

The subject of the paper is calculated analysis of double-chamber shock-struts. Introductory part of the paper contains characterization of main operation modes for shock absorption including landing shock and cross over of runway irregularities. Some double-chamber shock-struts are sel ected which implement in the most complete manner advantages of the shock-strut double-chamber structure. Mathematical description of these shock-struts is discussed. In the parts one and two of the paper two structural kinds of the double-chamber shock-struts are described in detail. All operational modes are described for each kind of the shock-struts. An equation is derived for relationship between velocities of shock-strut piston and floating piston as well as a computational algorithm is suggested for state parameters. Qualitative conclusions are obtained fr om a structure of this equation about operational features of the shock-strut kinds. The part three contains calculation results to compare both kinds of the shock-struts for the cases of landing shock and cross over of runway irregularities. A vertical velocity of impact is varied for the landing case whereas height of irregularities and taxing speed are changed for the cross over case. Areas of preferred application are revealed for both kinds of the shock-struts.

Keywords:

landing gear; double-chamber shock-strut; landing shock; cross over of runway irregularity; shock-strut piston; floating piston; low-pressure chamber; high-pressure chamber; D-chamber; throttle channels; hydraulic resistance; vacuum mode