T-Shaped Micromechanical Resonator for Low-Frequency Sensing
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Solution Overview
Problem
Micromechanical resonators with low frequency characteristics face challenges in reducing size and increasing sensitivity while maintaining a lower frequency characteristic, as increasing length leads to larger systems and reduced rigidity.
Innovation Solution
The design includes a micromechanical resonator with a supporting beam and a lumped mass on a loose end, where the loose end's width is greater than the fixed end's width, and a piezoelectric sensor, with air flow paths allowing air to flow through, reducing size and increasing sensitivity without increasing length or thickness, achieving resonance frequencies below 500 Hz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the length of the micromechanical resonator is increased to lower the frequency characteristic, then the frequency characteristic is improved, but the size of the total resonator system is increased and rigidity is reduced
Solution Approach 1:
The patent transitions from traditional length-based frequency control to width-based frequency control. By increasing the width of the loose end and lumped mass in the width dimension rather than extending length, the resonator achieves lower frequency characteristics while maintaining a compact overall size. This dimensional shift resolves the contradiction between frequency adjustment and size increase.
Solution Approach 2:
The patent applies local quality by creating a T-shaped supporting beam with varying width along its length. The fixed end has a smaller width while the loose end has a larger width, concentrating mass and stiffness properties at specific locations. This localized variation in geometric properties enables precise frequency control without uniformly increasing the entire resonator size.
2Use of energy by moving object
If the length of the micromechanical resonator is increased to lower the frequency characteristic, then the frequency characteristic is improved, but rigidity is reduced
Solution Approach 1:
The T-shaped supporting beam with varying width provides local quality optimization. The wider loose end section increases local stiffness and mass moment of inertia, compensating for the reduced overall beam length. This localized geometric enhancement maintains rigidity while enabling lower frequency operation through width-based tuning.
Solution Approach 2:
The resonator employs a composite structure combining the supporting beam with a lumped mass at the loose end. This composite configuration creates a system where the beam provides structural integrity and the attached mass provides inertial properties, enabling frequency control through mass distribution rather than beam length, thereby preserving rigidity.
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 minimizes size and manufacturing costs while maintaining a lower frequency characteristic, enhancing sensitivity and reducing air resistance, thus effectively addressing the size and sensitivity limitations of traditional resonators.
Implementation Method 1
a piezoelectric sensor, with air flow paths allowing air to flow through, reducing size and increasing sensitivity
Data Source
AI summary
Provided are micromechanical resonators and resonator systems including the micromechanical resonators. The micromechanical resonators may each include a supporting beam including a fixed end fixed on a supporting member and a loose end configured to vibrate, and a lumped mass arranged on the loose end, wherein the loose end has a width greater than a width of the fixed end, and a width of the lumped mass is greater than that the width of the fixed end.