Axisymmetric Coriolis Gyroscope Force-Angle Tracking Mode
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Solution Overview
Problem
Existing axisymmetric Coriolis vibrating gyroscopes face limitations in dynamic range and lock-in effects, particularly in Force To Rebalance (FTR) and Whole Angle (WA) modes, which restrict their operational effectiveness.
Innovation Solution
The implementation of a Force Angle Tracking (FAT) mode that combines pseudo-WA and pseudo-FTR modes, using a forcing control loop to maintain vibration direction at a variable setpoint, calculated from previous angular directions, allowing continuous output without dynamic range limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Force To Rebalance (FTR) mode is used to overcome lock-in effect, then continuous output is achieved, but dynamic range is restricted by rebalance force
Solution Approach 1:
The patent applies dynamics by making the setpoint variable rather than fixed. The setpoint is updated based on the angular direction from the previous sampling interval, allowing the system to adapt to changing angular rates dynamically. This resolves the contradiction by enabling the system to maintain continuous output while expanding the effective dynamic range through adaptive setpoint adjustment.
Solution Approach 2:
The patent changes the parameter of the setpoint from a constant value in FTR mode to a variable value that updates based on previous angular direction measurements. This parameter change allows the system to overcome the fixed dynamic range limitation of traditional FTR mode while maintaining continuous output operation.
2Measurement precision
If Whole Angle (WA) mode is used for high angular velocities, then geometric scale factor is achieved, but lock-in effect occurs for angular rates smaller than lock-in rate
Solution Approach 1:
The patent merges the advantages of both FTR mode (continuous output through rebalance force) and WA mode (geometric scale factor for high angular velocities) into a unified operating mode. By combining the forcing control mechanism with variable setpoint tracking, the system achieves continuous output across the entire dynamic range while maintaining measurement precision through the geometric scale factor relationship.
Solution Approach 2:
The patent creates a universal operating mode that functions effectively across all angular velocity ranges, replacing the need to switch between FTR and WA modes. The variable setpoint forcing control mechanism provides multi-functionality, delivering both the continuous output characteristic of FTR mode and the measurement precision of WA mode throughout the entire operational range.
3Ease of operation
If FTR mode operates with fixed setpoint, then control simplicity is maintained, but dynamic range is limited by rebalance force capability
Solution Approach 1:
The patent introduces dynamics to the setpoint parameter, transforming it from a fixed value to a variable that adapts based on previous angular direction measurements. This dynamic adjustment maintains control simplicity by using a straightforward forcing control mechanism while significantly expanding the dynamic range through the adaptive setpoint that automatically adjusts to the input angular rate.
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
FAT mode enables a robust gyroscope operation with continuous output and unlimited dynamic range, overcoming the limitations of FTR and WA modes without requiring hardware changes.
Implementation Method 1
When the gyroscope experiences angular rotation, the Coriolis effect induces secondary vibrations orthogonal to the original oscillation plane
Implementation Method 2
In one example the coupling between the resonator and the control elements is capacitive
Implementation Method 3
In another example the coupling between the resonator and the control elements is piezoelectric
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
A patch antenna includes: an upper patch radiator, a lower patch radiator beneath the upper patch radiator, an upper feed layer beneath the lower patch radiator, a ground plane beneath the upper feed and a lower feed layer beneath the ground plane. The upper feed layer couples a first feed line to the upper patch radiator. The ground plane has slot apertures in orthogonal directions, to obtain orthogonal polarizations. The lower feed layer couples a second feed line to the lower patch radiator. The upper feed layer is coupled to the lower patch radiator via the ground plane slot aperture in one direction, and the lower feed layer is coupled to the lower patch radiator via the ground plane slot aperture in an orthogonal direction.