Abstract
It is a difficult job to gauge the liquid fuel mass in a tank on spacecrafts under microgravity condition. Without the presence of strong buoyancy, the configuration of the liquid and gas in the tank is uncertain and more than one bubble may exist in the liquid part. All these will affect the measure accuracy of liquid mass gauge, especially for a method called Compression Mass Gauge (CMG). Four resonance resources affect the choice of compression frequency for CMG method. There are the structure resonance, liquid sloshing, transducer resonance and bubble resonance. Ground experimental apparatus are designed and built to validate the gauging method and the influence of different compression frequencies at different fill levels on the measurement accuracy. Harmonic phenomenon should be considered during filter design when processing test data. Results demonstrate the ground experiment system performances well with high accuracy and the measurement accuracy increases as the compression frequency climbs in low fill levels. But low compression frequencies should be the better choice for high fill levels. Liquid sloshing induces the measurement accuracy to degrade when the surface is excited to wave by external disturbance at the liquid natural frequency. The measurement accuracy is still acceptable at small amplitude vibration.
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The work was supported in part by the National Natural Science Foundation of China under Grant No.91216201 and 51205403.
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Fu, J., Chen, X. & Huang, Y. Compression Frequency Choice for Compression Mass Gauge Method and Effect on Measurement Accuracy. Microgravity Sci. Technol. 25, 213–223 (2013). https://doi.org/10.1007/s12217-013-9342-0
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DOI: https://doi.org/10.1007/s12217-013-9342-0