Prime-Branch Resonator Conductive Layer for Vibratory Sensor Damping
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Solution Overview
Problem
Resonators for angular parameter sensors, such as rate gyros, face issues with mechanical and electrical damping due to conductive layers, which degrade performance and increase energy requirements, especially when geometrical harmonic defects occur.
Innovation Solution
A conductive layer with a prime number of branches (at least seven) extending from the central portion to the peripheral edge of the bell, minimizing coverage in high-damping areas while ensuring electrical continuity, made of metal like platinum, with branches along meridians and covering the stem for easy powering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous conductive layer is applied to the bell, then electrical continuity is ensured, but mechanical damping and electrical damping increase
Solution Approach 1:
The conductive layer is segmented into discrete branches rather than being continuous. Multiple separate conductive branches extend from the central portion to the peripheral edge of the bell, providing electrical continuity while minimizing the total conductive material and its associated damping effects.
Solution Approach 2:
The conductive layer is applied selectively in specific regions (along meridians from center to edge) rather than uniformly across the entire bell surface. This local application ensures electrical continuity where needed while avoiding unnecessary conductive material in regions that would increase damping.
2Reliability
If a continuous conductive layer is applied to the bell, then electrical continuity is ensured, but electrical damping increases due to resistive losses
Solution Approach 1:
The conductive path is divided into separate branches, reducing the total cross-sectional area of conductive material and thereby minimizing resistive losses. The segmented structure maintains sufficient electrical continuity for operation while reducing energy loss through the conductive layer.
3Reliability
If the conductive layer covers the peripheral edge, then electrical continuity is achieved, but mechanical damping increases in high-damping areas
Solution Approach 1:
The conductive layer is strategically positioned along meridians extending from the central portion to the peripheral edge, concentrating conductivity where electrical continuity is most critical while avoiding excessive coverage in the peripheral edge regions where mechanical damping is most penalizing.
4Ease of manufacture
If a conventional conductive layer configuration is used, then fabrication is simple, but subharmonics are generated due to geometrical harmonic defects
Solution Approach 1:
The use of a prime number of branches (7, 11, or 13) creates an asymmetric configuration that does not harmonically align with common geometrical harmonic defects (orders 1-4). This asymmetric, non-repeating pattern disrupts the formation of subharmonic frequencies that would otherwise be generated by symmetric defects.
5Reliability
If the conductive layer is made thicker or more extensive, then electrical continuity is improved, but mechanical damping increases
Solution Approach 1:
Instead of using a thick continuous layer, the conductive path is achieved through multiple thin, segmented branches. This segmentation provides sufficient electrical continuity while minimizing the total volume of conductive material, thereby reducing mechanical damping effects.
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 reduces mechanical and electrical damping, limits subharmonics, increases fabrication tolerance, and maintains resonator performance by optimizing the conductive layer's influence on the bell's mechanical behavior.
Implementation Method 1
The conductive layer comprises branches extending from a central portion of the bell to a peripheral edge of the bell... sufficient conduction of electricity
Implementation Method 2
a resonator for a vibratory sensor of an angular parameter... the bell to be deformed into an ellipse and in order to detect the orientation of the ellipse
Data Source
AI summary
A resonator for an angular parameter sensor, the resonator comprising a bell of electrically-insulating material provided with a central stem and an electrically-conductive layer, the conductive layer comprising branches extending from a central portion of the bell to a peripheral edge of the bell, the number of said branches being a prime number not less than seven.