Triaxial Gyrometer Planar Structure for Accurate Rotation Measurement
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Solution Overview
Problem
Existing Coriolis vibratory gyroscopes face issues with additional signals from mechanical coupling and detection device selectivity, leading to degraded rotational speed measurements, particularly in multi-axis configurations, which require complex electronic processing to isolate true rotational information.
Innovation Solution
A monolithic tri-axis inertial sensor design with deformable projections connected only at one end to a frame, ensuring equal Coriolis coupling coefficients and insensitivity to primary vibration mode, allowing for accurate measurement of rotational speeds in three orthogonal axes without additional signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex electronic processing is implemented to eliminate additional signals, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The detection device is segmented into multiple independent detection elements, each dedicated to detecting a specific secondary vibration mode. This segmentation allows each detector to be highly selective for its target mode, eliminating the need for complex electronic processing to separate mixed signals.
Solution Approach 2:
The harmful additional signal from primary vibration mode is extracted and isolated from the detection system by using detection devices that are specifically designed to detect only secondary vibration modes. This extraction eliminates the interference without requiring complex post-processing.
2Measurement precision
If detection devices are made highly sensitive to secondary vibrations, then measurement precision is improved, but selectivity deteriorates causing additional signal interference
Solution Approach 1:
Different parts of the detection device are designed with different properties: some parts are highly sensitive to specific secondary vibration modes, while other parts are designed to be insensitive to the primary vibration mode. This local differentiation of detection properties allows high sensitivity without compromising selectivity.
Solution Approach 2:
The patent replaces complex electronic signal processing with a mechanically selective detection system. The detection devices are designed with specific geometric and mechanical properties that inherently filter out primary vibration signals while amplifying secondary vibration signals, substituting mechanical design for electronic processing.
3Adaptability or versatility
If multiple single-axis gyroscopes are assembled to achieve three-axis measurement, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent merges three single-axis gyroscope functionalities into a single integrated sensitive element that can detect rotations around three orthogonal axes simultaneously. The deformable frame with strategically positioned masses and vibration modes provides inherent three-axis measurement capability, eliminating the need to assemble multiple separate gyroscopes.
Solution Approach 2:
The sensitive element is designed with universal functionality to detect rotational movements around any of the three orthogonal axes. By exciting different primary vibration modes and detecting corresponding secondary modes, the same physical structure serves multiple measurement functions without requiring separate dedicated structures for each axis.
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
The design achieves equal sensitivities across axes, eliminating the need for complex electronic processing and minimizing signal interference, resulting in improved measurement accuracy and reduced power consumption.
Implementation Method 1
when the inertial sensor is rotated around any instantaneous axis of rotation and when its sensitive element vibrates in a primary vibration mode, then said sensitive element vibrates by the Coriolis effect in a secondary vibration mode with an amplitude proportional to the projection of the instantaneous vector of rotation on said sensitive axis
Data Source
AI summary
An inertial sensor for measuring information relating to rotation in three orthogonal axes, comprising a support and a vibrating sensitive element secured to the support; the sensitive element having a deformable frame and at least two deformable projections which extend in a plane (X-Y); wherein the inertial sensor extends in the same plane; the deformable frame and the at least two deformable projections have a plane of symmetry parallel to the plane; the at least two projections are rectilinear beams which have an approximately square cross section, are not collinear and are preferably approximately orthogonal to one another; each of the deformable beams being connected by only one end to the deformable frame at a location at which the amplitude of the primary vibration mode is at a maximum; and in that the sensor has a device for detecting each of the secondary vibration modes.