Liquid propellant mass gauge research based on compression mass gauge method
Measuring the propellant mass precisely for in-orbit satellite has been an important technical issue since last century.Compression mass gauge(CMG)is one of the high precision mass gauge methods,with advantages of good repeatability,high reliability and low power consumption.CMG has a wide application possibility in propellant mass gauge for satellite.After introducing the basic concept of CMG,the effect of compression frequency on measurement accuracy has been theoretically analyzed.A four-degree Runge-Kutta method has been applied in solving the differential equations.The simulated results showed that a lower compression frequency can help the pressure amplitude and time kept better in tube.The suggested compression frequency should be less than 0.1 Hz for application.A detailed design has been made to truly test the residual propellant mass in propellant system.Six measurements have been conducted for two liquid levels.The first three measurements were completed for the initial in-orbit correction.For the first three measurements,the repeatability of CMG is within 0.03％and the measurement precision is within 0.14％compared with the propellant injection initially.The second three measurements were finished after the propellant system worked.During the second three measurements the CMG repeatability is with 0.38％and the measurement precision is within 1.14％compared with the combined mass gauge method(combined with Bookkeeping and PVT method).According to the test correction,the measurement precision for the full scale is within 0.6％.The application of CMG in satellite propellant can maintain the need of propellant mass gauge.Since the application in satellite propellant system,CMG would become an important technical method in near future to measure the propellant mass with high precision.
liquid propellantcompression mass gauge(CMG)compression frequencymeasurement error
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