Measuring and testing – Frictional resistance – coefficient or characteristics – Lubricant testing
Patent
1992-06-29
1994-01-11
Chapman, John E.
Measuring and testing
Frictional resistance, coefficient or characteristics
Lubricant testing
73517B, 364553, 36457102, G01P 2100
Patent
active
052770532
ABSTRACT:
An electrostatically force balanced accelerometer employs electrostatic, single sided square law forcing after filtering and scaling the pickoff signal to determine a restoring force required to bring the pendulous mass (10) of the accelerometer back to its null position. A signal (44,48) proportional to the square root of the restoring force is applied to an electrostatic square law forcing circuit (50) that applies a restoring force to one side or the other of the pendulum (10). A system output signal (42) is proportional to the calculated restoring force, and thus linearly proportional to the sensed acceleration. The transfer function of the forcing circuit (50) is empirically determined by applying a series of known accelerations and measuring the balancing signal required to restore the pendulous mass (10) to its null position. A feedback signal (44,48) is then generated which has a relation to the pickoff signal that is the inverse of the empirically determined transverse function of the forcing circuit.
REFERENCES:
patent: 4282470 (1981-08-01), Reynolds
patent: 4483194 (1984-11-01), Rudolf
patent: 4584885 (1986-04-01), Cadwell
patent: 4611304 (1986-09-01), Butenko et al.
patent: 4873655 (1989-10-01), Kondraske
patent: 5095750 (1992-03-01), Suzuki et al.
McLane Daniel P.
Stewart Robert E.
Chapman John E.
Litton Systems Inc.
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