Flexural Vibration Element Frame Grooves
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Solution Overview
Problem
Piezoelectric vibration elements in flexural vibration mode suffer from mechanical and thermoelastic energy losses, leading to decreased performance characterized by increased CI values and reduced Q values, due to vibration energy leakage and heat conduction across the central supporting arm.
Innovation Solution
A flexural vibration element design featuring a central supporting arm extending between vibrating arms, with a frame body supporting the vibration element body at the end opposite to the connecting part, and grooves on the frame body's side parts to manage stress and temperature gradients, thereby minimizing energy loss and enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a central supporting arm is used to connect vibrating arms, then structural stability is improved, but mechanical energy loss increases due to vibration leakage
Solution Approach 1:
The harmful function of the central supporting arm (vibration leakage path) is extracted and eliminated by replacing it with frame body side parts that do not transmit vibration, while retaining the necessary structural support function
Solution Approach 2:
The support structure is segmented into the frame body and its side parts, allowing the side parts to provide structural stability without forming a continuous vibration transmission path through the center of the vibrating arms
2Strength
If a solid frame body is used to support the vibration element, then mechanical strength is improved, but thermoelastic energy loss increases due to heat conduction
Solution Approach 1:
The frame body is segmented by forming grooves that divide the side parts into multiple sections, interrupting the continuous heat conduction path while preserving the overall structural integrity and strength
Solution Approach 2:
The frame body has non-uniform thermal conductivity due to the grooves, creating regions of high and low thermal conductivity that prevent uniform heat distribution and reduce thermoelastic losses in critical areas
3Strength
If the frame body is made thick to increase strength, then mechanical strength is improved, but thermoelastic loss increases due to greater heat conduction path
Solution Approach 1:
Even though the frame body is thick, the grooves segment the structure into isolated thermal zones, preventing heat from conducting across the entire thickness and effectively limiting the heat conduction path length
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 suppresses mechanical and thermoelastic losses, resulting in improved performance by reducing vibration leakage and heat transfer, leading to higher Q values and enhanced operational stability.
Implementation Method 1
grooves on the frame body's side parts to manage stress and temperature gradients, thereby minimizing energy loss
Implementation Method 2
piezoelectric vibration elements in flexural vibration mode
Data Source
AI summary
A flexural vibration element according to a first aspect of the invention includes: a vibration element body composed of a plurality of vibrating arms provided in parallel, a connecting part connecting the vibrating arms, and one central supporting arm extending between the vibrating arms from the connecting part in parallel with the vibrating arms at equal distance from the arms; and a frame body disposed outside the vibration element body.