Piezoelectric Beam Coupling Structure for Stable Resonant Vibration
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Solution Overview
Problem
Conventional piezoelectric devices experience increased resonant frequency and vibration variation due to strong connections between beam sections, leading to undesirable stiffness and vibration modes.
Innovation Solution
A piezoelectric device design featuring a connecting section with slits and coupling portions that connect beam sections while reducing excessive force, incorporating a bridging portion and coupling portions to synchronize vibrations and prevent coupled vibration modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the connecting section connects beam sections with strong force, then vibration variation is reduced, but resonant frequency increases and beam sections become stiffer
Solution Approach 1:
The connecting section's geometry is modified by introducing slits and coupling portions that change its mechanical parameters. The slits reduce the connecting section's stiffness while the coupling portions maintain connection functionality, allowing vibration synchronization without excessive force transmission that would raise resonant frequency
Solution Approach 2:
The connecting section is divided into multiple functional parts including slits and coupling portions. This segmentation allows different regions to serve different functions: slits for stress reduction and flexibility, coupling portions for vibration synchronization, resolving the contradiction between connection strength and stiffness
2Stability of the object's composition
If the connection between beam sections is strengthened, then vibration synchronization is improved, but coupled vibration modes are generated
Solution Approach 1:
The connecting section has non-uniform structure with slits and coupling portions at specific locations. This local quality variation ensures that connection is strong enough for synchronization at coupling portions while slits prevent excessive force transmission that would generate harmful coupled vibration modes
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 reduces vibration variation and maintains resonant frequency stability, enhancing the device's performance as an ultrasonic transducer by promoting fundamental mode vibration and minimizing coupled vibration modes.
Implementation Method 1
Each of the plurality of beam sections is a piezoelectric vibrating section including a plurality of layers
Data Source
AI summary
A piezoelectric device includes a connecting section connecting a pair of beam sections adjacent to each other. The connecting section is connected to one of the pair of beam sections at a first end portion. The connecting section is connected to another of the pair of beam sections at a second end portion. The second end portion faces the first end portion in a direction in which the pair of beam sections are aligned. A second coupling portion is located along a first coupling portion. The connecting section includes only one first end portion. The connecting section includes only one second end portion. Each of the first end portion and the second end portion is closer to a tip end portion than to a fixed end portion of each of the pair of beam sections.