Design of a test bench for simulation of impact energy absorption in a main landing gear Boeing 737-300

This paper presents the methods and calculations of the design of an energy absorption test bench for the Boeing 737-300 main landing gear. The design of the hydraulic circuit stimulates the Hydraulic System A of the aircraft, it has: a hydraulic power unit for 3HP that supllies 15gpm at 3000psi, a filter of 10um, a reservoir of 4.8gal, a directional solenoid valve 4/3 ways with capacity of 2gpm, a pressure reducing valve and a double acting cylinder whose extension force is 37kN. Complying with FAR 23.723, the design of the pneumatic circuit applied to the structure of the bench; has six standard cylinders whose extension force is 4.5 kN, six throttle valves, six bistable 5/2 way selenoid valves. The air generation system is composed of a helical compressor from 6.334 m3/min to 10 bar; an air tank of 0.2 m3, an absorption dryer and a DHS pressure maintenance unit. The simulation of the circuits is done through the FluidSim software, the control is made from the electrical circuits that use push buttons, switches, relays and solenoid valves.