Boots – shoes – and leggings
Patent
1987-11-23
1990-03-13
Lall, Parshotam S.
Boots, shoes, and leggings
73290R, 73290V, 340618, G01F 2322
Patent
active
049087762
ABSTRACT:
A three-axis accelerometer (4) mounted on board a spacecraft (10) proximate a fuel tank (3) is used to derive an estimate of the amount of fuel (2) remaining within the tank (3). The output of the accelerometer (4) is converted (at 7) to a signal representing the rate of change of the polarity of the acceleration; amplitude information is ignored. This signal is then filtered by bandpass filter (8) or Fourier transform means and applied against an empirically derived function (stored within storage medium 9) relating frequency of oscillation to fuel (2) remaining in the tank (3). The function is stored for three axes; information from one axis is accessed, corresponding to the vector of a perturbing force such as caused by a thruster (11) firing. Some or all of the above described items can be located on board the spacecraft (10) itself. The accelerometer (4) can also be used directly to estimate the force imparted by the thruster, from the expression F=MA. This force is then related, by empirical data, to amount of fuel used during thruster (11) firing, which, when subtracted from an initial amount of fuel (2), provides a second check on the amount of fuel (2) remaining in the tank (3).
REFERENCES:
patent: 3389602 (1968-06-01), Clemens
patent: 4480468 (1984-11-01), Sinha
patent: 4494210 (1985-01-01), Miller
patent: 4531405 (1985-07-01), Leister
patent: 4591117 (1986-05-01), Scott
patent: 4601200 (1986-07-01), Stoffelen
Crill Philip D.
Leliakov Igor P.
Ford Aerospace & Communications Corporation
Lall Parshotam S.
Melnick S. A.
Radlo Edward J.
Zerschling Keith L.
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