Angular Velocity Sensor Vibration Arm Coupling for Lateral Acceleration
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Solution Overview
Problem
Existing horizontally located angular velocity sensors face challenges in distinguishing between vibrations caused by angular velocity and lateral acceleration, leading to reduced sensitivity and complex fixation issues.
Innovation Solution
A horizontally located angular velocity sensor design featuring a pair of first and second vibration arms coupled without a fixed section in between, allowing direct transmission of Coriolis force distortion and easy fixation, with one end of each second vibration arm coupled to the first vibration arm and the other end as a free end, enhancing sensitivity and detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a horizontally located angular velocity sensor is used, then miniaturization and low profile are achieved, but it becomes difficult to distinguish vibrations caused by angular velocity from those caused by lateral acceleration
Solution Approach 1:
The sensor is divided into multiple vibration arms (first vibration arm and second vibration arms) with different coupling configurations to the fixed section. The first vibration arm is coupled at both ends to the fixed section, while the second vibration arms are coupled only at one end, creating segmented structures that respond differently to angular velocity and lateral acceleration, enabling distinction between these forces.
Solution Approach 2:
The vibration arms are designed with asymmetric coupling configurations relative to the fixed section. The first vibration arm has symmetric coupling at both ends, while the second vibration arms have asymmetric coupling with free ends, creating different vibration characteristics that allow differentiation between Coriolis force-induced vibrations and lateral acceleration-induced vibrations.
2Measurement precision
If the drive arm and detection arm are coupled with a fixed section in between, then a complicated mechanism is provided to transmit distortion, but the fixed section becomes difficult to fix
Solution Approach 1:
The invention extracts and eliminates the complex fixed section mechanism from the distortion transmission path. By directly coupling the vibration arms to the fixed section in a simplified configuration, the patent removes the need for complicated intermediate mechanisms while maintaining effective distortion transmission through the vibration arms themselves.
3Device complexity
If the drive arm and detection arm are directly coupled without a fixed section, then the complicated mechanism is eliminated, but the arms are hardly vibrated and sensitivity is reduced
Solution Approach 1:
The vibration arms are designed with dynamic coupling characteristics, where the first vibration arm is coupled at both ends and the second vibration arms are coupled with free ends. This dynamic configuration allows the arms to vibrate effectively in response to Coriolis force while maintaining a simple overall structure, thereby preserving sensitivity without requiring complex mechanisms.
4Stability of the object's composition
If both ends of the vibration arms are fixed to the fixed section, then the structure is stable, but the arms are hardly vibrated and sensitivity is reduced
Solution Approach 1:
Different parts of the vibration arm structure are given different coupling qualities: the first vibration arm is coupled at both ends to the fixed section for stability, while the second vibration arms are coupled with free ends to enable effective vibration. This local differentiation of coupling characteristics allows the structure to maintain stability where needed while permitting vibration where required for sensitivity.
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 design effectively distinguishes between Coriolis force and lateral acceleration vibrations, improving sensitivity and detection accuracy while simplifying the fixation process, even when subjected to lateral acceleration.
Implementation Method 1
when the angular velocity sensor receives acceleration in a lateral direction
Implementation Method 2
a complicated mechanism is necessarily provided in the fixed section so as to efficiently transmit a distortion generated by Coriolis force
Data Source
AI summary
Provided is a horizontally located sensitive angular velocity sensor capable of easily eliminating influence of acceleration in a lateral direction and whose fixed section is easily fixed. The angular velocity sensor includes a pair of fixed sections fixed on a top of an sensor support section of a case, a detection arm extending along a plane parallel to the sensor support section, and a pair of upper drive arm and lower drive arm extending along the plane parallel to the sensor support section and extending in a direction opposite to each other so as to intersect an extending direction of the detection arm.