Yaw Rate Sensor Rigid Coupling Bar Vibration Suppression
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Solution Overview
Problem
Existing yaw rate sensors are sensitive to external vibrations due to minimal frequency spacing between desirable and undesirable detection modes, leading to errors from parasitic parallel oscillations.
Innovation Solution
The sensor structure incorporates a rigid coupling bar and suspension springs to suppress deflections, shifting parasitic parallel detection modes to higher frequencies, thereby increasing sensitivity to vibrations and stabilizing the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid coupling bar is introduced to suppress parasitic parallel oscillations, then the frequency spacing between usable and undesirable modes is widened, but the device complexity increases
Solution Approach 1:
The sensor structure is divided into separate functional components: a rigid coupling bar for suppressing parasitic oscillations, suspension springs for mechanical coupling, and detection means for measuring deflection. This segmentation allows each component to perform its specific function optimally while maintaining overall system reliability.
Solution Approach 2:
The rigid coupling bar acts as an intermediary element between the seismic mass and the substrate, functioning as a guide rail that suppresses large deflections of the outer part. It mediates the mechanical interaction to shift parasitic parallel oscillation frequencies to higher ranges while allowing the desired antiparallel oscillations to proceed normally.
2Speed
If the frequency spacing between detection modes is minimized, then the sensor can operate at lower frequencies, but the sensitivity to interfering vibrations increases
Solution Approach 1:
The invention changes the frequency parameters of the sensor structure by introducing the rigid coupling bar, which shifts the parasitic parallel oscillation frequencies to higher ranges. This parameter change creates a larger frequency gap between the usable antiparallel modes and the undesirable parallel modes, reducing sensitivity to external vibrations at the operating frequency.
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 design enhances the sensor's stability by suppressing parasitic oscillations, reducing sensitivity to interfering vibrations and improving the frequency spacing between usable and undesirable modes.
Implementation Method 1
In the presence of a yaw rate parallel to the main extension plane and perpendicular to the oscillation axis, Coriolis forces running perpendicularly to the main extension plane act on the first and the second Coriolis element, and deflect the first and the second Coriolis element perpendicular to the main extension plane.
Implementation Method 2
The surface electrodes overlap the Coriolis elements perpendicular to the main extension plane, forming with the Coriolis elements a plate-type capacitor structure, which permits capacitive measurement of the change in clearance between the Coriolis elements and the surface electrodes.
Implementation Method 3
The first seismic mass is connected to the substrate with the aid of a first suspension spring, the second seismic mass is connected to the substrate with the aid of a second suspension spring.
Data Source
AI summary
A sensor structure includes a substrate having a main extension plane, a first seismic mass and a second seismic mass, the first and the second seismic masses being deflectable relative to the substrate along a direction of deflection essentially perpendicular to the main extension plane. The first and second seismic masses are coupled together via a rigid coupling rocker pivotable around a rocker axis parallel to the main extension plane. The first seismic mass is suspended from the substrate with the aid of a first suspension spring, and an essentially rigid first coupling bar is situated between the first suspension spring and the first seismic mass.