Читать книгу Global Navigation Satellite Systems, Inertial Navigation, and Integration - Mohinder S. Grewal - Страница 81

If the center of mass of the rotor of a momentum wheel gyroscope is not concentric with its center of support, then the offset between the downward gravitational force on its mass and the upward force supporting it will create a torque. The component of that torque perpendicular to the spin axis of the rotor will then cause the rotor angular momentum to precess about the applied vertical force. It is an acceleration‐sensitive error torque due to axial mass unbalance that is difficult to avoid within manufacturing tolerances. It is commonly mitigated by calibrating its magnitude and compensating for it during operation.