Liquid-Cavity Vibration Sensing for Stable Frequency Response
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Solution Overview
Problem
Vibration sensing devices exhibit unstable frequency response due to high sensitivity near the resonant frequency and low sensitivity at other frequencies, leading to inconsistent performance across different frequency ranges.
Innovation Solution
Incorporating a vibration component with a liquid and a plate body forming a cavity wall, which introduces a second resonant frequency different from the primary resonant frequency of the vibration sensor, stabilizing the frequency response across a wider range by adjusting structural parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the vibration sensing device operates near its resonant frequency, then the sensitivity is high, but the frequency response becomes unstable and inconsistent across different frequency ranges
Solution Approach 1:
The invention divides the single resonant system into multiple resonant systems by introducing additional vibration components (second and third vibration components) with different resonant frequencies. This segmentation allows the device to maintain high sensitivity across multiple frequency bands rather than being limited to a single resonant peak, thereby stabilizing the frequency response across a broader spectrum.
Solution Approach 2:
The invention changes the resonant frequency parameters by designing vibration components with specifically tuned resonant frequencies (first resonant frequency for the vibration sensor, second resonant frequency for the first vibration component, and third resonant frequency for the second vibration component). By adjusting these parameter values, the device achieves stable frequency response across different frequency ranges while maintaining high sensitivity at each resonant frequency.
2Measurement precision
If a single resonant frequency is used, then the sensitivity is high at that frequency, but the frequency response curve shows large amplitude differences between peak and trough
Solution Approach 1:
The invention segments the frequency response into multiple bands by introducing additional vibration components with distinct resonant frequencies. The first vibration component provides a second resonant frequency and the second vibration component provides a third resonant frequency, creating overlapping or adjacent frequency bands that collectively broaden the effective frequency response range while maintaining high sensitivity across each segment.
Solution Approach 2:
The invention merges multiple resonant systems (vibration sensor plus first and second vibration components) into a unified sensing device. The combined system leverages the resonant characteristics of each component to achieve both high sensitivity at specific frequencies and extended frequency response coverage, effectively combining the advantages of multiple single-frequency sensors into one device.
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 introduction of a second resonant frequency enhances sensitivity and stability of the vibration sensing device across a broader frequency range, reducing the amplitude difference between peaks and troughs to 5-15 dBV, improving overall performance.
Implementation Method 1
the at least one vibration component may be configured to form one or more resonant systems, and one of the one or more resonant systems may be composed of the liquid and the plate body
Data Source
AI summary
An embodiment of the present disclosure provides a vibration sensing device, which may include a vibration sensor and at least one vibration component. The vibration sensor has a first resonant frequency, at least one vibration component may be configured to transmit the received vibration to the vibration sensor, and the at least one vibration component may include a liquid arranged in the target cavity and a plate body forming a part of the cavity wall of the target cavity. The at least one vibration component may provide at least one second resonant frequency for the vibration sensing device, and at least one second resonant frequency may be different from the first resonant frequency.