Angular Velocity Sensor Fixed Portion Slits
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Solution Overview
Problem
Existing angular velocity sensors of the horizontally located type face challenges in efficiently transmitting distortion generated by the Coriolis force due to the fixed portion's rigidity, leading to inefficient vibration transmission and potential shakiness during operation.
Innovation Solution
Incorporating one or more slits or trenches in the fixed portion that intersect with the detection arm portion, allowing for easier distortion and efficient transmission of Coriolis-induced vibrations, while maintaining structural integrity for secure mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fixed portion is tightly fixed onto the support surface, then the mounting stability is improved, but the transmission efficiency of Coriolis force-induced distortion deteriorates
Solution Approach 1:
The fixed portion is segmented by introducing slits or trenches that divide the structure into multiple regions. This segmentation allows different parts of the fixed portion to have different degrees of freedom - some areas can deform to transmit Coriolis force while other areas maintain rigid mounting stability. The slits create distinct zones that can independently respond to different mechanical demands.
Solution Approach 2:
Different regions of the fixed portion are given different local properties through the slits. Areas with slits have reduced rigidity to facilitate distortion transmission, while areas without slits maintain full rigidity for stable mounting. This local differentiation allows the structure to simultaneously satisfy both mounting stability and distortion transmission efficiency requirements in different spatial locations.
2Measurement precision
If the fixed portion is loosely fixed onto the support surface, then the transmission efficiency of Coriolis force-induced distortion is improved, but the structural stability deteriorates causing shakiness
Solution Approach 1:
The fixed portion is divided into rigid mounting regions and flexible sensing regions by the slits. The rigid regions maintain structural stability and prevent shakiness, while the flexible regions near the detection arms allow efficient distortion transmission. This spatial segmentation resolves the contradiction between overall structural stability and local flexibility.
Solution Approach 2:
The structure merges rigid and flexible characteristics within a single fixed portion by strategically placing slits. The combination of rigid areas (for stability) and slit-containing areas (for flexibility) allows the fixed portion to simultaneously provide structural stability against shakiness and local flexibility for distortion transmission.
3Strength
If the fixed portion is made rigid, then the structural strength is improved, but the sensitivity to Coriolis force deteriorates
Solution Approach 1:
The fixed portion exhibits non-uniform local quality with rigid regions providing structural strength and slit-containing regions providing sensitivity. The slits create localized zones of reduced stiffness that are highly responsive to Coriolis force, while the overall structure maintains sufficient strength through the rigid portions.
Solution Approach 2:
The structure is segmented into load-bearing rigid regions and force-sensitive flexible regions. This segmentation allows the rigid portions to handle mechanical loads and maintain structural integrity, while the flexible portions with slits specialize in detecting and transmitting Coriolis force-induced distortions.
4Measurement precision
If the fixed portion is made flexible, then the sensitivity to Coriolis force is improved, but the mounting stability deteriorates
Solution Approach 1:
Different local regions of the fixed portion have different flexibility characteristics. Regions with slits are made flexible to enhance sensitivity to Coriolis force, while other regions maintain rigidity to ensure mounting stability. This local quality differentiation allows simultaneous achievement of sensitivity and stability.
Solution Approach 2:
The fixed portion is segmented into flexible sensing zones and rigid mounting zones. The flexible zones with slits provide high sensitivity to Coriolis force by allowing easy distortion, while the rigid zones provide stable mounting by resisting deformation under operational loads.
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 enhances the sensitivity, accuracy, and resolution of angular velocity detection by effectively discriminating Coriolis-based vibrations from translational acceleration-induced vibrations, improving the overall performance and stability of the sensor.
Implementation Method 1
a drive arm portion connected to the fixed portion and extending along the plane parallel to the support surface... distortion generated by the Coriolis force applied on the drive arm
Data Source
AI summary
An angular velocity sensor of a horizontally located type, in which influence of a translational acceleration applied thereto from a lateral direction is readily removed and a fixed portion thereof is easily fixed, is provided. It includes a fixed portion fixed to the top surface of a sensor element supporting portion of a casing, an upper detection arm portion and a lower detection arm portion respectively connected to the fixed portion on sides opposite to each other and extending along a plane parallel to the top surface of the sensor element supporting portion, and a pair of upper vibration arms connected to the fixed portion with the upper detection arm portion in between. The fixed portion includes one or more slits extending at least in a direction intersecting with the extending direction of the upper detection arm portion.