Vibrating Bridge With Segmented Exciter For Drift Reduction
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Solution Overview
Problem
Vibrating-wire sensors face challenges with measurement precision due to the introduction of piezoceramics, which cause inaccurate values and drift over time, especially when used in vibrating bridges with magnetic excitation, leading to increased energy consumption and complex assemblies.
Innovation Solution
A vibrating bridge design where one vibrator is free of exciter or detector elements, allowing for optimal resonance properties with a high Q-factor, and using a separate vibrator for excitation and detection, eliminating negative impacts on resonance behavior and allowing for precise measurement without drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If piezoceramics are applied to the vibrating bar for excitation and detection, then the assembly becomes more integrated, but measurement precision deteriorates due to drift and inaccurate values
Solution Approach 1:
The vibrating bridge is divided into multiple independent vibrators (first, second, third, and fourth vibrators). The exciter is applied only to the first vibrator, while the second, third, and fourth vibrators remain free of exciter elements. This segmentation isolates the piezoceramic excitation to a specific component, preventing its harmful effects (drift, mass changes, elasticity changes) from affecting the measurement vibrators, thereby maintaining measurement precision while achieving integrated excitation.
Solution Approach 2:
The harmful elements (piezoceramic exciters and detectors) are extracted from the measurement-critical vibrators and placed only on the first vibrator. The second, third, and fourth vibrators are kept free of such elements, effectively removing the source of measurement drift and inaccuracy from the measurement path, thus preserving measurement precision while maintaining integrated excitation capability.
2Ease of operation
If multiple piezoelectric elements are assembled on vibrating bars, then excitation and detection are achieved, but measurement precision deteriorates due to mass changes and elasticity changes
Solution Approach 1:
The system is segmented into excitation vibrators (first vibrator with piezoceramic exciter) and measurement vibrators (second, third, and fourth vibrators without exciters). This segmentation ensures that mass changes and elasticity changes in the piezoceramic elements affect only the first vibrator, while the measurement vibrators maintain their original mass and elasticity characteristics, preserving measurement stability.
Solution Approach 2:
The piezoceramic excitation elements are extracted from the measurement vibrators and confined to the first vibrator only. This removal eliminates the harmful effects of piezoceramic mass changes, elasticity changes, and temperature sensitivity from the measurement path, ensuring that measurements remain stable and accurate while excitation functionality is preserved through the first vibrator.
3Device complexity
If a single vibrator is used for both excitation and detection, then device complexity is reduced, but measurement precision deteriorates due to disturbed resonance behavior
Solution Approach 1:
The system is segmented into dedicated excitation vibrators (first vibrator) and dedicated measurement vibrators (second, third, and fourth vibrators). This functional segmentation allows each vibrator to perform its specific role without interference, preserving the high Q-factor and sharp resonance characteristics of the measurement vibrators while maintaining a relatively simple overall structure with only four vibrators total.
Solution Approach 2:
The excitation function is extracted from the measurement vibrators and assigned to the first vibrator with the piezoceramic exciter. This separation ensures that the resonance behavior of the measurement vibrators (second, third, and fourth) remains undisturbed and maintains high quality factors, while the excitation vibrator handles all piezoceramic-related disturbances, thus preserving measurement precision.
4Ease of operation
If piezoelectric elements are mounted on the vibrating bar, then excitation is achieved, but energy consumption increases
Solution Approach 1:
The excitation function is segmented and assigned to a single first vibrator with piezoceramic exciter, while the second, third, and fourth vibrators require no active excitation. This segmentation minimizes the total energy consumption by limiting piezoceramic excitation to one vibrator rather than multiple, reducing overall power requirements while maintaining effective measurement capability through the remaining vibrators.
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 design achieves the highest measurement precision possible with vibrating-wire sensors, reducing energy consumption and eliminating drift, while allowing for faster measurement intervals by eliminating the need for repetitive frequency searches.
Implementation Method 1
at least one of the vibration exciters or vibration detectors is designed as a piezoelectric element
Implementation Method 2
the resonance frequency of the vibrating wire, which is made to vibrate during operation by an exciter assembly, changes
Implementation Method 3
at least one of the vibration exciters or vibration detectors is designed as a piezoelectric element
Data Source
AI summary
The invention relates to a vibrating bridge for a vibrating-wire sensor, comprising opposing clamping points for connecting the vibrating bridge to the vibrating-wire sensor and comprising multiple vibrators which are provided between the clamping points and which are mechanically connected to the securing points and can be tensioned via the securing points, wherein one of the vibrators is free of a vibration exciter or vibration detector, and another vibrator is provided with a vibration exciter.