Gyro Vibrator Element Frequency Separation for Temperature Drift
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Solution Overview
Problem
Conventional gyro vibrator elements experience significant temperature drift due to unwanted vibrations, particularly in out-of-plane flexural mode, which is not adequately suppressed by existing designs, leading to instability across varying temperature ranges.
Innovation Solution
The design incorporates a configuration where the difference between the y1-mode and y2-mode vibrational frequencies is set to be greater than the difference between these frequencies and the drive vibrational frequency, with specific beam thickness and fixation section arrangements to minimize temperature drift and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional gyro vibrator element designs are used, then the device can operate in broad temperature ranges, but temperature drift occurs due to unwanted vibrations
Solution Approach 1:
The patent applies parameter changes by carefully controlling the relationship between drive vibrational frequency fd and unwanted mode vibrational frequencies fy1 and fy2. Specifically, it sets |fd-fy1|>|fd-fy2| to optimize frequency separation and minimize temperature drift while maintaining broad temperature range operation
Solution Approach 2:
The patent uses mechanical vibration principles by controlling the vibrational frequencies of the gyro vibrator element. It regulates the drive vibrational frequency fd and manages unwanted mode frequencies fy1 and fy2 through structural design, using vibration frequency relationships to suppress temperature drift
2Reliability
If out-of-plane flexural mode vibrations are suppressed by setting frequency ratios, then temperature drift is reduced, but other unwanted vibrations remain insufficiently suppressed
Solution Approach 1:
The patent extends parameter changes beyond just out-of-plane flexural mode by controlling multiple frequency relationships simultaneously. It sets |fd-fy1|>|fd-fy2| where fy1 and fy2 represent different unwanted mode frequencies, thereby suppressing multiple types of unwanted vibrations including but not limited to out-of-plane flexural modes
Solution Approach 2:
The patent uses mechanical vibration control by managing the vibrational characteristics of the gyro element. It regulates the drive frequency fd and controls unwanted vibrations at frequencies fy1 and fy2 through structural design, creating frequency separation to suppress multiple vibration modes
3Volume of moving object
If the gyro vibrator element is miniaturized, then it can be used in portable equipment, but temperature stability becomes more difficult to maintain
Solution Approach 1:
The patent applies parameter changes by optimizing frequency relationships in miniaturized structures. By controlling the relationship |fd-fy1|>|fd-fy2| in compact gyro vibrator elements, it maintains temperature stability despite reduced size, enabling use in portable equipment
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 suppresses the excitation of unwanted vibrations, reducing temperature drift and providing a stable characteristic for the gyro vibrator element, even across broad temperature ranges.
Implementation Method 1
a drive vibrational frequency fd at which the first vibration arm and the second vibration arm vibrate along a second direction perpendicular to a first direction in which one of the first vibration arm and the second vibration arm extends
Implementation Method 2
a y1-mode vibrational frequency fy1 at which the base section, the first vibration arm, and the second vibration arm vibrate in the same direction along the first direction
Data Source
AI summary
A gyro element as a vibrator element fulfills the relationship: |fd−fy1|>|fd−fy2|, where fd is a drive vibrational frequency of first through fourth drive vibration arms, fy1 is a y1-mode vibrational frequency of a y1 mode, in which a base section and the first through fourth drive vibration arms vibrate in the same direction along a first direction (a y-axis direction) in which the first drive vibration arm extends, and fy2 is a y2-mode vibrational frequency of a y2 mode in which the base section vibrates along the first direction and the first through fourth drive vibration arms vibrate along the first direction in an opposite direction to a direction in which the base section vibrates.