HYDRAULIC SYSTEM FOR LOADING OF AVIATION STRUCTURES FOR STRENGTH TESTING Russian patent published in 2015 - IPC G01M5/00 

FIELD: testing equipment.

SUBSTANCE: hydraulic system comprises an electrohydraulic amplifier, blocking valves with electric control, distributing valves with electric control, drain valves, check valves, a load limiter, a force exciter and an automatic control system. The distributing valve is made in the form of a two-linear two-position distributing valve, opening-closing of which is carried out in accordance with the set program. At the same time the distributing valve drains liquid from the injection line, where drain valves are installed, into the drain line. Check valves serve to reduce residual pressure in cavities of the force exciter during liquid drainage, at the same time in the injection line of the two-linear two-position distributing valve a check valve is installed additionally. Control of distributing valves is carried out from the automatic control system.

EFFECT: increased reliability of tested object protection and simplified operation of a test bench.

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