Apparatus and method for determining the rate of rotation of a m

Details Apparatus and method for determining the rate of rotation of a m Apparatus and method for determining the rate of rotation of a m

1991-10-17

1993-03-02

Chapman, John E.

Measuring and testing

Speed, velocity, or acceleration

Angular rate using gyroscopic or coriolis effect

G01P 904

Patent

active

051899132

ABSTRACT:
An apparatus and method for determining the rate of rotation of a body rotating with an angular velocity .omega. about a first axis. The apparatus comprises a housing adapted to be fixed to the body so as to rotate with the angular velocity .omega. about the first axis and a mechanical system within the housing having more than two degrees of freedom. Electromagnetic drive coils are provided for applying a forced vibration to the mechanical system about a second axis substantially perpendicular to the first axis, thereby producing a Coriolis response along a third axis mutually perpendicular to the first and second axes, the forced vibration having a predetermined magnitude and a frequency which is constrained to lie within a predetermined range such that there is produced a coupling between the degrees of freedom whereby the magnitude of the Coriolis response is substantially insensitive to frequency. The magnitude of the Coriolis response is measured and a computing device responsive to the magnitude of the forced vibration and to the magnitude of the Coriolis response calculates the rate of rotation .omega.. In a preferred embodiment, the mechanical system has four degrees of freedom and comprises an inertial beam having a couple of concentrated masses or an inertial mass element coupled thereto.

REFERENCES:
patent: 4884446 (1989-12-01), Ljung
patent: 4930351 (1990-06-01), Macy et al.

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