Axially Symmetrical Vibrating Sensor Rotation Speed Determination
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Solution Overview
Problem
Axially symmetrical vibrating sensors experience significant angular drift errors due to harmonic components that are influenced by the position of the vibration relative to the casing, which complicates the determination of speed of rotation, especially under varying temperature and aging conditions.
Innovation Solution
A method involving successive evaluations of the speed of rotation at multiple geometrically offset positions, using a precession command to move the vibration, and taking a mean of these evaluations to eliminate harmonic drift errors, with specific angular offsets calculated to cancel out harmonic amplitudes and phases, thereby minimizing residual drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration and correction tables are applied to compensate drift error, then measurement precision is improved, but device complexity increases and correction possibilities are limited due to temperature and aging variations
Solution Approach 1:
The patent changes the operational parameter by sequentially evaluating speed of rotation at multiple geometrically offset positions (different angular orientations) rather than at a single position. This parameter change allows the system to capture harmonic drift variations and compute a mean value that eliminates harmonic components, improving measurement precision without requiring complex correction tables for temperature and aging effects.
2Measurement precision
If multiple evaluations at geometrically offset positions are performed, then harmonic drift errors are reduced, but measurement time increases
Solution Approach 1:
The patent employs periodic action by sequentially evaluating the speed of rotation at multiple geometrically offset positions in a systematic sequence. The vibration is moved from one position to another by applying precession commands, and evaluations are performed periodically at each position. This periodic evaluation approach enables the elimination of harmonic drift errors through mean computation while maintaining efficient measurement timing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces harmonic drift errors, allowing for more accurate determination of speed of rotation, independent of temperature and aging effects, and can be implemented using software modules integrated with the control unit of the inertial device.
Implementation Method 1
a vibrating member associated with control electrodes and with detection electrodes for generating vibration presenting an elastic line possessing periodicity of order n
Implementation Method 2
the vibration being moved from one position to another by applying a precession command using a preestablished scale factor
Data Source
AI summary
A method and device of determining a speed of rotation of an axially symmetrical vibrating sensor. The sensor has a vibrating member associated with control electrodes and with detection electrodes for generating a vibration presenting an elastic line possessing periodicity of order n and having a position that is variable as a function of the rotation of the sensor. The method includes performing successive evaluations of the speed for a predetermined number of positions of the vibration relative to the electrodes. The positions are geometrically offset relative to each other and the vibration is moved from one position to another by applying a precession command using a pre-established scale factor. The method also includes determining a speed of rotation in function of the evaluations.