Low-temperature pressure cycle life testing method and system

Abstract

The invention discloses a low-temperature pressure cycle life testing method and system. According to a typical embodiment in the invention, a vibration generator and a bellows assembly are respectively used as a power supply and a driving element; a driving part of the bellows assembly is connected with a moving part of the vibration generator through a driving assembly; an enclosed liquid chamber filled with an incompressible low temperature fluid medium and an enclosed gas chamber filled with a compressible low temperature fluid medium are formed by separate cooperation among the bellows assembly, a pressure testing joint pipe, a diaphragm capsule, etc.; and the driving part of the bellows assembly stretches out and draws back under the driving of movement of the moving part of the vibration generator, so a liquid in the liquid chamber extrudes the diaphragm capsule so as to form pressure fluctuation. The system provided by the invention has a simple structure, has low assembling and maintenance cost, is easy to operate and can conveniently adapt to different pressure fluctuation amplitudes and frequencies by adjusting the output displacement and frequency of a vibrating table, thereby guaranteeing high control precision of pressure fluctuation.

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....

AI Technical Summary

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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