Low temperature pressure cycle life test method and system

Abstract

The invention discloses a low-temperature pressure cycle life test method and system, and its typical implementation includes: respectively using a vibration generating device and a bellows assembly as a power source and a transmission element, and the transmission part of the bellows assembly passes through the transmission assembly and the vibration generating device The moving parts are connected, and the bellows assembly is used to cooperate with the pressure measuring connecting pipe and the bellows respectively to form a closed liquid cavity filled with an incompressible low-temperature fluid medium and a closed air cavity filled with a compressible low-temperature fluid medium; and through The movement of the moving part of the vibration generating device drives the transmission part of the bellows assembly to expand and contract, so that the liquid filled in the liquid chamber squeezes the bellows to form a pressure pulsation. The system of the invention is simple in structure, low in assembly and maintenance cost, easy to operate, and can adapt to different pressure pulsation amplitudes and frequencies by conveniently adjusting the output displacement and frequency of the vibrating table, ensuring higher control precision of pressure pulsation.

Description

technical field [0001] The invention particularly relates to a low-temperature pressure cycle life test system and method, which can be applied to simulate pressure fluctuations in rocket fuel delivery pipelines, and to assess the fatigue performance of pressure accumulator bellows on pipelines in an incompressible low-temperature fluid medium environment . Background technique [0002] The severity level of the pressure pulsation in the rocket fuel delivery pipeline is determined by the pulsation amplitude, equilibrium pressure and pulsation frequency, and the simulated medium is usually liquid nitrogen. At present, the traditional electromagnetic vibrating table cooperates with the vibration controller to accurately realize the predetermined alternating frequency and displacement amplitude, and can provide a relatively large thrust. However, the precise displacement control provided by the shaking table cannot be directly applied to the pressure pulsation simulation test....

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Problems solved by technology

However, the precise displacement control provided by the shaking table cannot be directly applied to the pressure pulsation simulation test

In addition, most hydraulic fatigue test equipment can compress the air chamber of the accumulator bellows through the actuator to achieve the pulsation amplitude, but because the medium of the actuator is hydraulic oil, the sealing method is not suitable for liquid nitrogen, and cannot Effective thermal insulation of the medium inside the actuator and therefore also difficult to apply

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