Angular Rate Sensor Oscillation Isolation via Absorption Portion
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Solution Overview
Problem
Existing angular rate sensors with tuning-fork oscillators face issues with oscillation leakage and external oscillation influence, leading to system malfunctions, particularly when mounted on vehicles or robots, as the oscillator's properties change and external vibrations affect the sensor output.
Innovation Solution
The angular rate sensor design incorporates a tuning-fork oscillator with a support portion and an oscillation absorption portion on its back face, and a mounting portion with a heavy weight separated from the package, to absorb and isolate oscillations, thereby reducing the transmission of oscillations to the mounting portion and minimizing external influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tuning-fork oscillator is mounted on a support substrate or base to enable operation, then the oscillator can function properly, but the oscillation leaks to the mounting portion and external oscillation influences the oscillator
Solution Approach 1:
The patent introduces an oscillation absorption portion as an intermediary element between the support substrate and the mounting portion. This intermediate component absorbs oscillations before they can propagate to the mounting portion, thereby preventing external oscillation influence while maintaining oscillator operation stability
Solution Approach 2:
The patent extracts the oscillation absorption function from the support substrate itself and implements it as a separate oscillation absorption portion. This separation allows the support substrate to focus on structural support while the dedicated oscillation absorption portion handles vibration isolation, effectively resolving the contradiction between mounting stability and oscillation isolation
2Stability of the object's composition
If a member with large amplitude holds the oscillator support to achieve counter balance, then structural stability is improved, but oscillation leakage increases
Solution Approach 1:
The oscillation absorption portion serves as a mediator between the structurally stable member and the oscillator mounting portion. It allows the large-amplitude member to provide structural stability while preventing the resulting oscillations from leaking to the mounting portion through its vibration absorption capability
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 effectively restrains oscillation leakage and external oscillation influences, maintaining the sensor's accuracy and preventing system malfunctions by enhancing the inertia moment and thermal stability of the support portions, thus ensuring reliable angular rate detection.
Implementation Method 1
The oscillation absorption portion is provided on a back face of the support portion opposite to the front face
Implementation Method 2
The heavy weight is fixed to the fixing portion and is separated from the mounting portion. It is possible to restrain the oscillation of the fixing portion even if the mounting portion oscillates, because of an inertia moment of the heavy weight
Data Source
AI summary
An angular rate sensor includes a tuning-fork oscillator, a support portion, an oscillation absorption portion and a mounting portion. The tuning-fork oscillator has a base and arm portions extending from the base. The support portion supports the base of the tuning-fork oscillator at a front face thereof. The oscillation absorption portion is provided on a back face of the support portion opposite to the front face. The mounting portion mounts the support portion through the oscillation absorption portion.