Gyroscopic Sensor Ceramic Base Decoupling Parasitic Vibration
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Solution Overview
Problem
Conventional gyroscopic sensors are heavy and bulky due to stiff materials used in their bases, leading to amplification of parasitic vibration modes that interfere with the 'useful' vibration mode, resulting in reduced performance and precision in rotation angle measurements.
Innovation Solution
A gyroscopic sensor with a base made of an insulating material, such as ceramic, and integrated electrical connections, using elastic conducting support rods to decouple the electrode carrier from the base, and a design that minimizes parasitic vibration modes by optimizing the material's density and Young's modulus, allowing for a lightweight and compact form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stiff material base is used to reduce vibrations, then the sensor becomes heavy and bulky, but parasitic vibration modes are amplified
Solution Approach 1:
The patent changes the material parameter from metal to ceramic, which has different density and elastic modulus characteristics. This allows achieving the required stiffness with lower mass, resolving the contradiction between base strength and sensor weight.
Solution Approach 2:
The patent uses a composite structure combining ceramic base with metalized elements and elastic conducting support rods. This composite approach allows optimizing both stiffness and weight by combining materials with complementary properties.
2Strength
If a stiff material base is used to reduce vibrations, then the sensor becomes heavy and bulky, but the sensor size increases
Solution Approach 1:
By changing from metal to ceramic material, the patent achieves higher stiffness-to-volume ratio, allowing the base to be more compact while maintaining required mechanical strength.
3Weight of moving object
If the base mass is reduced, then the sensor becomes lightweight and compact, but parasitic vibration modes interfere with the useful vibration mode
Solution Approach 1:
The patent optimizes the ceramic base dimensions and material properties to shift parasitic vibration modes away from the useful vibration frequency range, preventing interference while maintaining lightweight design.
Solution Approach 2:
The elastic conducting support rods act as intermediaries between the ceramic base and electrode carrier, providing mechanical decoupling that isolates the sensitive element from parasitic vibrations while maintaining electrical connections.
4Reliability
If support rods pass through the base to provide electrical connections, then electrical connectivity is achieved, but the base loses structural integrity and increases complexity
Solution Approach 1:
The patent replaces mechanical through-hole connections with surface-mounted electrical contacts on the ceramic base, eliminating the need for support rods to pass through the base. This maintains base structural integrity while providing reliable electrical connections.
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 reduces the mass and size of the sensor by up to two-thirds, minimizing parasitic vibration modes and enhancing the precision of rotation angle measurements by isolating the 'useful' vibration mode, while also providing a sealed and more reliable electrical connection system.
Implementation Method 1
The decoupling element is designed to decouple the electrode carrier and the sensitive element relative to the dimensional variations of the base that are brought about by the thermal variations to which the sensor is subjected.
Implementation Method 2
The decoupling element is designed to decouple the electrode carrier and the sensitive element relative to the dimensional variations of the base
Implementation Method 3
the first electrical coupler is elastic along the axial direction of the shaft of the sensitive element and along a direction perpendicular thereto to compensate for any modifications in the distance between the electrode carrier and the base
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
Gyroscopic sensor (2) comprising: - a sensitive element (4) suitable designed to vibrate; - an electrode carrier (8) capable of carrying excitation electrodes (20) and detection electrodes (20) for detecting the vibration of the sensitive element; and - elements (10,16) for supporting the electrode carrier;characterized in that the supporting elements (10, 16) comprise : - a base (10) made of an insulating material, - electrical connections (34, 35) integrated into the base (10), - conducting support rods (16) interposed between the base (10) and the electrode carrier (8), said support rods (16) being, on one side, soldered to electrical contacts (42, 46) of the electrical connections (34, 35) and, on the other side, connected to the excitation/detection electrodes (20) of the electrode carrier (8).