Vibration Sensor With Shear-Deformed Elastic Element
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Solution Overview
Problem
Current vibration sensors, particularly those used as bone conduction microphones, suffer from insufficient sensitivity, which affects the quality of sound transmission and are not effective in noisy environments.
Innovation Solution
A vibration sensor design incorporating a vibration receiver with a housing and a vibration unit comprising a mass element and an elastic element, where the cross-sectional area deviation between the mass element and the acoustic cavity is less than 25%, enhancing volume compression ratio and sensitivity by reducing the spring coefficient through shear deformation of the elastic element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the cross-sectional area of the mass element is reduced to match the acoustic cavity, then the volume compression ratio and sensitivity are improved, but the mass of the vibration unit decreases
Solution Approach 1:
The patent optimizes the cross-sectional area parameter of the mass element to be less than 25% of the acoustic cavity area, and adjusts the elastic element properties to achieve the desired spring coefficient, thereby improving sensitivity through parameter optimization
2Measurement precision
If the spring coefficient is reduced through shear deformation of the elastic element, then the sensitivity is improved, but the structural stability deteriorates
Solution Approach 1:
The patent applies different deformation modes to different parts of the elastic element, using shear deformation specifically to reduce the spring coefficient while maintaining overall structural integrity through localized quality differentiation
Solution Approach 2:
The patent employs composite structural design combining the mass element and elastic element with specific material properties to achieve both low spring coefficient and high structural stability simultaneously
3Measurement precision
If the vibration unit is acoustically connected to the first acoustic cavity, then the sound transmission quality is improved, but the environmental noise interference increases
Solution Approach 1:
The patent uses the acoustic cavity as an intermediary between the vibration unit and the external environment, allowing sound transmission while providing acoustic isolation from environmental noise through the cavity structure
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 improves sensitivity and reduces environmental noise interference, making it suitable for use in noisy conditions and enhancing sound transmission quality.
Implementation Method 1
reducing the spring coefficient through shear deformation of the elastic element
Implementation Method 2
an elastic element, where the cross-sectional area deviation between the mass element and the acoustic cavity is less than 25%, enhancing volume compression ratio and sensitivity by reducing the spring coefficient through shear deformation of the elastic element
Implementation Method 3
The vibration unit vibrates in response to the vibration of the housing and transmit, through the first acoustic cavity, the vibration to the acoustic transducer to generate an electrical signal
Data Source
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AI summary
A vibration sensor includes a vibration receiver and an acoustic transducer. The vibration receiver includes a housing and a vibration unit. The housing forms an acoustic cavity. The vibration unit is located in the acoustic cavity and divides the acoustic cavity into a first acoustic cavity and a second acoustic cavity. The acoustic transducer is acoustically connected to the first acoustic cavity. The housing is configured to generate vibration based on an external vibration signal. The vibration unit vibrates in response to the vibration of the housing and transmits, through the first acoustic cavity, the vibration to the acoustic transducer to generate an electrical signal. The vibrating unit includes a mass element and an elastic element. A deviation between cross-sectional areas of the mass element and the first acoustic cavity perpendicular to a vibration direction of the mass unit is less than 25%.