Gyrometer Coupling Device for Symmetrical Mode Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Microelectromechanical gyrometers face challenges in distinguishing between useful and non-useful resonant modes, with the non-useful in-phase mode having a lower resonant frequency than the useful antiphase mode, and existing coupling devices do not effectively impose symmetrical movements on elements in movement.
Innovation Solution
A coupling device with a symmetry plane, featuring two articulated levers connected to elements and a coupling element that moves in translation, preventing rotation and allowing symmetrical movement, is used to connect decoupling frames in a gyrometer, shifting the in-phase mode to higher frequencies and favoring the antiphase excitation mode at a lower frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional coupling devices are used to connect two movable elements, then the elements can move relative to each other, but the device cannot effectively impose symmetrical movements or distinguish between useful and non-useful resonant modes
Solution Approach 1:
The coupling device is segmented into distinct functional components: two articulated levers connected to the movable elements, a separate coupling element that enforces symmetry, and anchoring studs with springs for controlled translation. This segmentation allows each component to perform its specific function independently, enabling precise imposition of symmetrical movements while maintaining manageable structural complexity
Solution Approach 2:
The coupling device introduces asymmetry in its constraint mechanism: it allows symmetrical movements (in-phase and antiphase modes) while preventing asymmetrical movements through the symmetry plane constraint. This selective asymmetry enables the device to distinguish between useful antiphase modes and non-useful in-phase modes by imposing symmetrical movement patterns that favor the antiphase resonant mode
2Measurement precision
If the non-useful in-phase mode has a lower resonant frequency, then it is easier to excite, but it becomes harder to distinguish from useful signals and reduces measurement accuracy
Solution Approach 1:
The coupling device converts the potentially harmful in-phase mode into a beneficial constraint condition. By enforcing symmetry through the coupling element and symmetry plane, the device causes in-phase movements to generate opposing forces that cancel out, effectively suppressing the non-useful mode. This transforms what would be a source of measurement error into a mechanism that actively enhances signal distinction accuracy
Solution Approach 2:
The coupling device applies preliminary anti-action by pre-constraining the movable elements to follow symmetrical movement patterns before excitation occurs. The symmetry plane constraint and coupling element预先 establish movement boundaries that prevent the system from naturally settling into the non-useful in-phase mode, thereby preventing disturbance sensitivity before it can affect measurements
3Stability of the object's composition
If the coupling element allows free rotation, then the levers can move independently, but symmetrical movements cannot be imposed on the elements
Solution Approach 1:
The coupling element exhibits local quality by providing different degrees of freedom in different directions: it allows free translation along the symmetry plane (providing movement freedom) while constraining rotation about the out-of-plane axis (imposing symmetry). This directional differentiation enables the device to maintain lever movement freedom in useful directions while enforcing symmetrical movement constraints in critical directions
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 configuration improves the operation of the gyrometer by reducing the sensitivity to disturbances and allowing differential measurements by ensuring symmetrical movements, enhancing the gyrometer's ability to detect rotation speed while minimizing the impact of acceleration or gravity.
Implementation Method 1
said coupling element being connected to the support by one or more anchoring studs and springs providing a movement in translation in said direction of the plane while preventing rotation about the out-of-plane direction
Implementation Method 2
two levers articulated in rotation on a support about an out-of-plane direction
Implementation Method 3
two levers articulated in rotation on a support about an out-of-plane direction, each lever including a first end intended to be connected respectively to one of the two elements movable with respect to each other
Implementation Method 4
The two movable elements connected by the coupling device then have movements symmetrical with respect to the symmetry plane
Data Source
AI summary
A mechanical coupling device coupling in movement two elements able to move in translation along a first direction, configured to impose thereon movements in phase opposition, the coupling device including two arms rotationally articulated about a second out-of-plane direction, each arm to be connected to one of the movable elements, a coupling element to which the two arms are connected by elements having high rigidity in a third direction, the coupling element being configured to move in translation along the third direction, first and second devices for suspending the coupling element configured to guide the coupling element in translation along the third direction and to limit rotational movement thereof about the second direction.