Low temperature hydraulic shock test method

Abstract

The invention discloses a low-temperature hydraulic impact test method. The method is used for testing a strength characteristic of an accumulator bearing a lot of hydraulic impact under a low temperature condition and the method is realized mainly based on a low-temperature hydraulic impact test system. The system is mainly formed by a falling impact bench, a support, a corrugated pipe pressure chamber, a thermal insulation system, a pressure monitoring unit and the like. The pressure chamber is divided into an external cavity and an internal cavity by one corrugated pipe. An external cavity portion of the pressure chamber is connected to a glass steel shaft. The external cavity is directly immersed into the thermal insulation system which is filled with liquid nitrogen. The internal cavity is filled with the liquid nitrogen and is connected to the accumulator. In the invention, the impact bench is cooperated with the corrugated pipe so that impact under a low temperature medium is realized; through a simple method, a gasification phenomenon of the liquid nitrogen in a pipeline is effectively solved; a real condition is simulated and a low-temperature impact resistance test of the accumulator can be effectively realized; through setting work parameters of an impact bench height, internal contracting brake time and the like, a pressure impact amplitude is accurately set so that different test demands are satisfied.

Description

technical field [0001] The invention particularly relates to a low-temperature hydraulic impact test method, the pressure medium of which is liquid nitrogen, which can be applied to truly simulate the pressure impact in a rocket fuel delivery pipeline and assess the impact resistance performance of a pressure accumulator on the pipeline. Background technique [0002] In the pressure shock test in the simulated rocket fuel delivery pipeline, the simulated medium is liquid nitrogen, which is used to truly assess the impact resistance of the pressure accumulator. Because liquid nitrogen is very easy to gasify under normal test conditions, it cannot be maintained in liquid nitrogen. , so how to maintain liquid nitrogen as a pressure medium is a difficult problem. [0003] Considering that the traditional vibration and shock table cooperates with the controller, the acceleration is used as the feedback, and the pressure signal is not directly controlled, and the cost is relativel...

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Problems solved by technology

[0003] Considering that the traditional vibration shock table cooperates with the controller to use acceleration as feedback, and does not directly control the pressure signal, and because only the impact test is performed, the cost is relatively high

[0004] In addition, the circuit of the detection system generally cannot directly withstand low temperature, and will fail in a low temperature environment. Moreover, when there is a large amount of gas in the sensor, the detected peak is much smaller than the actual one, and the pulse width is relatively increased, which cannot be true. The results of the reaction test

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