Vibratory ring structure
AssigneeAtlantic Inertial Systems Limited
InventorChristopher Paul Fell
Life of this patent
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Abstract
A method of tuning a vibratory ring structure is described which comprises determining an angular spacing for a pair of fine tuning holes (16) of substantially the same size, located on or near the neutral axis of the vibratory ring structure (10), the angular offset being selected to reduce to an acceptable level the frequency split between the target normal mode and a further normal mode which Is angularly offset relative to the target normal mode, and forming the pair of fine tuning holes (16) in the vibratory ring structure (10) at the determined angular spacing, A ring structure, for example a gyroscope, tuned or balanced in this manner is also disclosed.
Claims16
A method of tuning a vibratory ring structure comprising determining an angular spacing for a pair of fine tuning holes of substantially the same size, located on or near the neutral axis of the vibratory ring structure, the angular offset being selected to reduce to an acceptable level the frequency split between the target normal mode and a further normal mode which is angularly offset relative to the target normal mode, and forming the pair of fine tuning holes in the vibratory ring structure at the determined angular spacing.
A vibratory ring structure comprising a ring body tuned by the formation of a pair of fine tuning holes of substantially the same size, located on or near the neutral axis of the ring body, the fine tuning holes being positioned at an angular offset relative to one another that is selected to reduce to an acceptable level the frequency split between a target normal mode and a further normal mode of the ring body, the further normal mode being angularly offset relative to the target normal mode.
Dependencies are inferred from the claim text.