Magneto-Inductive Flow Meter Tube Deformation Compensation
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Solution Overview
Problem
Magneto-inductive flow measuring devices face challenges with deformation under pressure fluctuations and repeated pressure cycles, especially in measuring tubes made of synthetic materials, leading to inaccurate flow measurements.
Innovation Solution
A flow measuring device that uses a combination of first and second measurement signals, where the first signal depends on flow velocity and the second signal depends on the flow cross-sectional area, independent of velocity, to accurately calculate flow through a measuring tube, with the second signal obtained through strain gages or other means like acoustic surface waves, allowing for real-time calibration factor correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If synthetic material measuring tubes are used in magneto-inductive flow measuring devices, then ease of manufacture and corrosion resistance are improved, but measurement precision deteriorates due to deformation under pressure fluctuations and repeated pressure cycles
Solution Approach 1:
The patent applies feedback by continuously monitoring the measuring tube's deformation through strain gauges and using this information to compensate for measurement errors. The system measures the actual deformation of the synthetic tube wall and adjusts the flow calculation accordingly, creating a closed-loop correction mechanism that maintains measurement precision despite material deformation.
Solution Approach 2:
The patent changes the parameter approach by introducing a second measurement signal that specifically measures the cross-sectional area of the measuring tube. Instead of assuming a constant cross-section, the system dynamically adjusts the geometric parameters based on real-time deformation data from strain gauges, allowing accurate flow calculation despite changes in tube dimensions due to pressure variations.
2Reliability
If strain gages are embedded in the measuring tube layers to monitor loading, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the strain gage system to serve multiple functions: monitoring tube deformation, detecting pressure fluctuations, and providing compensation data for flow measurements. The same strain gage infrastructure used for reliability monitoring also enables accurate flow measurement compensation, eliminating the need for separate measurement systems.
Solution Approach 2:
The patent merges the reliability monitoring function with the flow measurement function by integrating strain gage data into the flow calculation process. The deformation data from strain gauges is combined with the voltage signal from the measuring electrodes to produce corrected flow values, merging what were previously separate functions into a unified measurement system.
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 solution provides robust pressure resistance and accurate flow measurement by accounting for changes in the flow cross-sectional area, reducing measurement errors caused by pressure fluctuations and material deformation, ensuring reliable volume and mass flow calculations.
Implementation Method 1
a second measurement signal is registered, which depends on the flow cross sectional area of the medium in the measuring tube and is independent of the flow velocity of the medium in the measuring tube
Implementation Method 2
the means for registering the second measurement signal involves measuring via acoustic surface waves
Data Source
AI summary
A method and flow measuring device for ascertaining flow of a medium through a measuring tube based on at least a first measurement signal, which depends at least on the flow velocity of the medium in the measuring tube, wherein the first measurement signal is registered, wherein an additional, second measurement signal is registered, which depends on the flow cross sectional area of the medium in the measuring tube and is independent of the flow velocity of the medium in the measuring tube, and wherein flow is ascertained as a function of the first and second measurement signals.