MEMS Vibration Element with Dissimilar Elastic Support
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Solution Overview
Problem
Conventional vibration-driven energy harvesters have a low flexibility in adapting to varying predominant frequencies due to the same material used for the elastic support unit and movable unit, requiring significant cost and effort for adaptation.
Innovation Solution
A MEMS vibration element with an elastic support unit made of a material different from the fixed and movable units, preferably with higher fracture toughness, such as metal, allowing for easier adaptation to various environmental frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the elastic support unit is made of the same material as the movable unit, then the manufacturing process is simplified, but the adaptability to various predominant frequencies is reduced
Solution Approach 1:
The patent applies local quality by making the elastic support unit from a different material than the movable unit. Specifically, the elastic support unit uses a material with different elastic properties (different Young's modulus) to provide the necessary flexibility for adapting to various predominant frequencies, while the movable unit maintains its original material properties for its specific function. This localized material differentiation resolves the contradiction by providing frequency adaptability where needed without complicating the overall manufacturing process.
Solution Approach 2:
The patent employs composite materials by combining different materials for the elastic support unit and the movable unit. The elastic support unit is constructed from a material selected based on the target predominant frequency, creating a composite structure that optimizes both adaptability and manufacturing efficiency. This approach allows the system to adapt to different frequency requirements while maintaining a relatively streamlined manufacturing process.
2Reliability
If the elastic support unit is made of a material with high fracture toughness, then the durability is improved, but the design flexibility is reduced
Solution Approach 1:
The patent applies parameter changes by selecting materials for the elastic support unit based on specific parameter requirements - particularly fracture toughness and Young's modulus. By changing the material parameters according to the target predominant frequency and durability requirements, the patent achieves both high reliability and design flexibility. The method allows optimization of fracture toughness for durability while independently optimizing other parameters for frequency adaptation.
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
Enables easy manufacturing of a MEMS vibration element that can adapt to various environmental vibrations by matching the resonance frequency with the predominant frequency, improving design flexibility and durability.
Implementation Method 1
an elastic support unit that elastically supports the movable unit at the base unit
Implementation Method 2
it is necessary to match a resonance frequency of the vibration-driven energy harvester with a predominant frequency which is a predominant frequency in a power spectrum of the environmental vibration
Data Source
AI summary
A MEMS vibration element includes: a base unit; a fixed unit fixed to the base unit; a movable unit that is movable relative to the fixed unit; and an elastic support unit that elastically supports the movable unit at the base unit. The elastic support unit is made of a material different from a material of the fixed unit and the movable unit.