Microgravity Propellant Gauging Using Modal Analysis: Phase III

The Modal Propellant Gauging experiment seeks to demonstrate the infusion potential of a non-invasive, inexpensive, and robust method for gauging both settled and unsettled propellant at gauging resolutions of 1% for settled propellants and 2-4% for unsettled, sloshing propellants. Phase III of the project represents a significant expansion of the previously funded program objectives to address immediate needs in the Orion/SLS Exploration Mission architecture. Specifically, two central objectives are: (1) Demonstrate 1% zero-g gauging resolutions of baffle-settled realistic propellant simulant in model propellant tanks with internal propellant management structures, (2) Verify a central hypothesis of the MPG approach, which is that the mass-loading of tank walls (and therefore the modal frequencies) is uniquely determined by the adhered liquid layer. This work is a continuation from T0160. Problem Statement In order to meet the objectives, two distinct experiments will be carried out. The first objective will be accomplished using the MPG parabolic flight rig with baffle-settled propellant simulant. Isopropyl alcohol (IPA) will be used to better represent the Bond Number and other liquid-structure parameters of cryogenic propellants in real tanks. The existing composite overwrapped vessel (COPV) tanks will be outfitted with propellant management devices and ring baffles to accurately reproduce the internal structures of the Orion propellant tanks. The baffles will be designed and tested to produce settled liquids within seconds after the onset of zero-g portion of the parabolic flight trajectory.
Infusion work for SLS/Orion discussed at IAC 2018

The Modal Propellant Gauging is a non-invasive and simple way to do an in-space assessment of remaining propellant left inside a vehicle's tank. This technology will benefit future NASA missions and the industry.

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