LMS acquisition system and water hammer pressure parameter calibration method and processing method thereof

Abstract

The invention belongs to the field of liquid rocket engine test parameter testing, and particularly relates to an LMS acquisition system and a water hammer pressure parameter calibration method and processing method thereof. The problem that an existing water hammer pressure acquisition system is low in signal acquisition accuracy is solved, a water hammer pressure signal is used as a new thoughtof dynamic signal acquisition, and the water hammer pressure signal and dynamic parameters such as vibration and pulsating pressure are acquired together by means of the characteristic that an LMS acquisition system is high in acquisition rate (generally 25.6 kHz or above). The water hammer pressure signal is accurately obtained; the LMS acquisition system and a water hammer pressure signal conditioner need to be combined, a new water hammer pressure parameter calibration and measurement method needs to be researched and explored, and meanwhile, measurement data can explore a new water hammerpressure parameter measurement data processing method by utilizing powerful time domain, frequency domain and other calculation and analysis functions of the LMS so as to meet the water hammer pressure parameter measurement requirements.

Description

technical field [0001] The invention belongs to the field of liquid rocket engine test parameter testing, and in particular relates to an LMS acquisition system and a water hammer pressure parameter calibration method and processing method thereof. Background technique [0002] In the ground test of the liquid rocket engine, the water hammer pressure data is the main index to measure the instantaneous impact of the fluid on the pipelines and valves before the pump when the engine starts and shuts down, and reflects the impact of water hammer on the pipelines and valves before the pump on the test bench to a certain extent. At the same time, it provides an important reference for the material selection, welding process and strength design of key components such as the pump pipeline and valves. The water hammer pressure signal is a transient signal. Its measurement method is different from that of steady-state parameters such as temperature and pressure. The signal acquisition...

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Problems solved by technology

[0003] In order to solve the problem of low accuracy of the signal obtained by the existing water hammer pressure acquisition system, the present invention provides an LMS acquisition system and its water hammer pressure parameter calibration method and processing method, which uses the water hammer pressure signal as a dynamic signal acquisition A new idea, taking advantage of the high acquisition rate (generally above 25.6kHz) of the LMS acquisition system, to collect water hammer pressure signals together with dynamic parameters such as vibration and pulsation pressure

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