Vibration Gyro Element Multi-Mode Drive Amplifies Detection Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vibration gyro elements face challenges in enhancing detection sensitivity, particularly as they are miniaturized, due to limited options for increasing the exciting force on detection vibrating arms, which restricts their ability to accurately measure angular velocities and accelerations.
Innovation Solution
The vibration gyro element employs a configuration with drive and detection vibrating arms that flexurally vibrate in multiple modes, including a drive mode and two detection modes, where the arms vibrate oppositely or in the same phase to amplify the exciting force and resonance frequencies, thereby increasing detection sensitivity. This configuration involves setting specific relationships between the resonance frequencies and dimensions of the vibrating arms to achieve higher sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the vibration gyro element is miniaturized, then the device size is reduced, but the detection sensitivity deteriorates due to limited options for increasing exciting force
Solution Approach 1:
The patent utilizes mechanical vibration of the vibrating arms in multiple modes (drive mode and two detection modes) to generate exciting force. By controlling the vibration frequencies and phases of the arms, the system achieves enhanced detection sensitivity without increasing device size. The Coriolis force generated during rotation modulates the vibration modes to produce detectable signals.
Solution Approach 2:
The patent changes physical parameters such as resonance frequencies, vibration phases, and mode combinations to optimize detection sensitivity. By setting specific frequency relationships between drive and detection modes, and by controlling the phase relationships between vibrating arms, the system amplifies the exciting force while maintaining miniaturized dimensions.
2Measurement precision
If the exciting force on detection vibrating arms is increased, then detection sensitivity is improved, but the device complexity increases due to limited configuration options
Solution Approach 1:
The vibrating arms serve multiple functions simultaneously: they act as both drive elements and detection elements, and they perform both in-plane and out-of-plane vibrations. This multi-functionality allows the system to increase detection sensitivity through multiple vibration modes without adding separate dedicated components, thereby avoiding increased device complexity.
Solution Approach 2:
The system employs mechanical vibration in multiple modes (drive mode and two detection modes) to generate exciting force. By controlling the vibration frequencies and phases of the arms, the system achieves enhanced detection sensitivity without increasing device size. The Coriolis force generated during rotation modulates the vibration modes to produce detectable signals.
3Measurement precision
If multiple vibration modes are employed, then detection sensitivity is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent changes physical parameters such as resonance frequencies, vibration phases, and mode combinations to optimize detection sensitivity. By setting specific frequency relationships between drive and detection modes, and by controlling the phase relationships between vibrating arms, the system amplifies the exciting force while maintaining miniaturized dimensions.
Solution Approach 2:
The system employs mechanical vibration in multiple modes (drive mode and two detection modes) to generate exciting force. By controlling the vibration frequencies and phases of the arms, the system achieves enhanced detection sensitivity without increasing device size. The Coriolis force generated during rotation modulates the vibration modes to produce detectable signals.
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 enhanced configuration results in increased detection sensitivity, with amplification factors up to 1.35 times the original sensitivity, allowing for more accurate measurement of angular velocities and rotations, and can be further optimized by adjusting the width-to-length ratio of the support part and detuning frequencies.
Implementation Method 1
a piezoelectric ceramic for driving is bonded to one side surface of a vibrating arm (turning bar)
Implementation Method 2
flexurally vibrates in the Y direction by Coriolis force when rotating around the Z-axis
Implementation Method 3
a piezoelectric ceramic for extraction is bonded to another adjacent side surface
Data Source
AI summary
A vibration gyro element includes drive vibrating arms and detection vibrating arms at the opposite side, and has a first detection mode in which the drive vibrating arms flexurally vibrate oppositely to each other in an out-of-plane direction in an opposite phase to an action direction of Coriolis force and the detection vibrating arms flexurally vibrate oppositely to each other in the out-of-plane direction in an opposite phase to that of the drive vibrating arms, and a second detection mode in which the drive vibrating arms flexurally vibrate oppositely to each other in the out-of-plane direction in the same phase as the action direction of the Coriolis force and the detection vibrating arms flexurally vibrate oppositely to each other in the out-of-plane direction in the same phase as that of the drive vibrating arms.