3 stage hydraulic actuator for shock test and method for operating of the same

The present invention to ensure that flow into the acceleration chamber to the pressure oil by way of a communication path that is opened while the piston is accelerated forward on the 3-speed hydraulic generation device and a driving method of the above acceleration piston accelerating the mass. And a three-stage installation the hydraulic velocity generating apparatus and the pressure chamber 10 in a separate space from each other is filled with a gas and an oil pressure state, to be in communication with the pressure chamber 10 in accordance with the present invention, the pressure chamber (10 ), another oil that is pressurized by the charge oil to the communication via the distribution chamber 20 and the distribution chambers 20 and the communicating portion 31 to be filled therein, the pressure from the distribution chamber 20 to the When the oil is supplied and includes an acceleration chamber 30 which accelerates the piston 32 is installed to move forward, and the driving method, the gas filling step (S110) of filling a pressurized gas to the upper portion of the pressure chamber 10, and the first oil filling step (S120) for charging the pressurized oil to the distribution chamber 20, and the second oil charge step (S130) of filling the pressure oil to the bottom of the pressure chamber 10, the acceleration chamber (30 ) and the oil supply to the piston acceleration (acceleration piston driving step (S140) to start to advance 32) pressurized to, As the flow into the oil is the acceleration chamber 30 is charged by way of a communication with the distribution chamber 20 is formed between and the accelerator piston 32 to advance the distribution chamber 20 and the acceleration chamber (30) masses ( It includes an acceleration phase (S150) to accelerate M).