Vibrating Gyro Sensor Frequency Ratio Optimization
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Solution Overview
Problem
Existing vibrating gyro sensors face challenges in maintaining detection sensitivity due to leakage outputs caused by imprecise processing and miniaturization, which can reduce mechanical strength and increase leakage outputs, leading to decreased detection sensitivity.
Innovation Solution
The design incorporates a vibrating element with a base, drive vibrating arms, detection vibrating arms, and adjustment vibrating arms, where the frequencies of these arms are adjusted to satisfy specific ratios to enhance vibration transmission efficiency and reduce leakage outputs, thereby improving detection sensitivity without compromising mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the vibrating element is miniaturized to reduce size, then the device becomes more compact, but the mechanical strength decreases and leakage outputs increase
Solution Approach 1:
The patent optimizes the frequency ratio parameter between drive and detection vibrating arms to satisfy a specific mathematical relationship. By controlling the frequency ratio within a predetermined range, the invention achieves effective leakage output suppression while maintaining the miniaturized structure's mechanical strength, resolving the contradiction between size reduction and strength maintenance
2Ease of manufacture
If imprecise processing is used to simplify manufacturing, then the ease of manufacture increases, but leakage outputs occur and detection sensitivity decreases
Solution Approach 1:
The invention transforms the manufacturing problem from requiring high precision to accepting normal precision by changing the frequency ratio parameter. By designing the vibrating arms with frequencies satisfying the predetermined ratio relationship, the system becomes tolerant to processing variations while maintaining high detection sensitivity, thus resolving the contradiction between ease of manufacture and measurement precision
3Ease of manufacture
If the cross-sectional shape of vibrating arms deviates from rectangular due to etching anisotropy, then the ease of manufacture increases, but the vibration direction deviates and leakage output increases
Solution Approach 1:
The patent compensates for the unstable vibration direction caused by etching anisotropy by optimizing the frequency ratio parameter between drive and detection arms. This parameter optimization ensures that even with non-rectangular cross-sections from anisotropic etching, the vibration directions remain properly aligned and leakage outputs are suppressed, resolving the contradiction between manufacturing ease and compositional stability
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 increases the detection sensitivity of the vibrating gyro sensor by optimizing the frequency ratios of the vibrating arms, reducing leakage outputs, and maintaining mechanical strength, resulting in stable and high-sensitivity angular velocity detection.
Implementation Method 1
a piezoelectric vibrating element (vibrating gyro device) made of quartz or any other piezoelectric material
Implementation Method 2
detects an angular velocity in the form of an electric signal produced in part of the gyro vibrating element by swing, rotation, and other vibrating actions
Implementation Method 3
When a drive signal (vibration excitation signal) is applied to the drive electrode to cause the vibrating arms to vibrate in a direction along the first surface (in-plane vibration), and the vibrating element is rotated around a detection axis extending in the direction in which the vibrating arms extend (for example, Y axis in the case of vibrating gyro device formed of quartz Z plate), the vibrating arms vibrate under a Coriolis force in the direction perpendicular to the first surface (out-of-plane vibration)
Implementation Method 4
the frequencies of natural vibration of the drive vibrating arm and the detection vibrating arm are made equal to each other, thereby making the drive vibrating arm and the detection vibrating arm resonate with each other
Data Source
AI summary
A vibrating element includes a base, drive vibrating arms, detection vibrating arms, and adjustment vibrating arms. The drive vibrating arms are driven to make bending vibration in a predetermined plane. The following expressions (1) and (2) are satisfied:f3>f2 (1)0.964×(1−0.321(1+L/t))≦f2/f1≦0.995 (2)where t represents the thickness of the base, L represents the length of the base in the direction in which the drive vibrating arms extend, f1 represents the frequency of natural vibration of the detection vibrating arms in a direction that intersects the predetermined plane, f2 represents the frequency of natural vibration of the drive vibrating arms in a direction that intersects the predetermined plane, and f3 represents the frequency of natural vibration of the adjustment vibrating arms in a direction that intersects the predetermined plane.