Coriolis Gyro Closed Modes Vibration Immunity
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Solution Overview
Problem
Coriolis gyros based on spring and mass systems are sensitive to accelerations and vibrations, leading to error signals in rotation rate sensors.
Innovation Solution
A Coriolis gyro with a substrate and multiple individual structures connected via spring elements, featuring closed excitation and detection modes that are not easily excited by accelerations or vibrations, utilizing force transmitters and taps to measure Coriolis forces during rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spring and mass systems are used for Coriolis gyro, then the resonant frequencies of useful modes can be lower and produce significant error signals, but vibration and linear accelerations can excite these modes and cause error signals
Solution Approach 1:
The proof mass is divided into multiple individual structures (at least two) that are coupled to the substrate and to each other via spring elements. This segmentation allows the system to achieve closed excitation and detection modes that are not easily excited by external accelerations and vibrations, thereby reducing error signals while maintaining measurement precision.
Solution Approach 2:
Instead of using traditional open modes that are easily excited by external forces, the patent inverts the approach by designing closed modes where the proof mass structures are coupled through spring elements to form a closed system. This closed configuration prevents external accelerations and vibrations from easily exciting the useful modes, thus reducing error signals.
2Object-affected harmful factors
If shape and bending oscillations are used, then externally closed modes do not transmit forces to the outside, but soft suspension is required which deflects significantly under accelerations and vibration
Solution Approach 1:
The proof mass is segmented into multiple individual structures coupled by spring elements, creating a closed system that maintains force balance while reducing deflection under external accelerations. The segmented structure allows each component to contribute to the closed mode without requiring excessive soft suspension.
Solution Approach 2:
The patent changes the mechanical parameters of the system by using spring elements with specific stiffness characteristics that allow the closed modes to maintain low force transmission to the mount while having sufficient rigidity to resist deflection under accelerations and vibrations.
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 solution significantly reduces sensitivity to accelerations and vibrations, minimizing error signals and allowing for precise measurement of rotation rates with reduced manufacturing complexity.
Implementation Method 1
spring elements which couple some of the individual structures to the substrate and to one another
Implementation Method 2
The detection mode is excited, in the excited excitation mode, by a Coriolis force when the Coriolis gyro is rotated about a sensitive axis
Data Source
AI summary
A Coriolis gyro having an arrangement which comprises a substrate, at least two individual structures and spring elements. The spring elements couple the individual structures to the substrate and to one another. Force transmitters and taps are provided. The arrangement has at least one excitation mode which can be excited by the force transmitters and at least one detection mode which can be measured by the taps. The excitation mode and the detection mode are closed, as a result of which no disturbance excitations of the excitation mode and of the detection mode can be caused by linear accelerations and/or vibrations if there is no need to take account of manufacturing tolerances.