Coriolis Flow Meter Damping Correction for Two-Phase Media
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Solution Overview
Problem
Conventional in-line measuring devices for flow media, especially those with vibration-type transducers, face significant inaccuracies and reduced reproducibility due to inhomogeneities like gas bubbles and solid particles, leading to fluctuations in mass flow rate measurements, particularly in two- or multi-phase media, which can result in overflow or underdosage during filling processes.
Innovation Solution
An in-line measuring device with a vibration-type transducer that determines an anti-symmetrical damping value based on the spatial distribution of inhomogeneities within the measuring tube, using vibration measurement signals and excitation signals to correct for the phase difference and zero-point variations, ensuring accurate mass flow rate and totalized mass flow measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional vibration-type transducers are used for measuring mass flow rate in two-phase or multi-phase media, then the measuring device can operate continuously, but the measurement precision deteriorates due to inhomogeneities like gas bubbles and solid particles causing fluctuations and zero-point variations
Solution Approach 1:
The patent implements feedback by continuously monitoring the damping behavior of the measuring tube and automatically adjusting the evaluation algorithm based on detected inhomogeneities. The system measures the damping ratio and quality factor, compares them against reference values, and dynamically compensates for measurement errors caused by gas bubbles and solid particles, thereby maintaining high measurement precision during continuous operation
Solution Approach 2:
The patent changes the evaluation parameters from fixed reference values to dynamically adjustable parameters that adapt to varying medium conditions. By monitoring damping ratio and quality factor variations and adjusting the evaluation algorithm accordingly, the system maintains accurate measurements despite changes in medium composition, flow rate, and inhomogeneity levels during continuous operation
2Measurement precision
If the measuring tube vibrates to generate Coriolis forces for measurement, then mass flow rate can be determined, but inhomogeneities in the medium cause asymmetrical damping that reduces measurement reproducibility
Solution Approach 1:
The system continuously monitors the damping ratio and quality factor of the measuring tube vibrations and feeds this information back to adjust the measurement evaluation. By detecting asymmetrical damping patterns caused by inhomogeneities and automatically compensating through adaptive algorithms, the system maintains high measurement reproducibility while continuing to determine mass flow rate accurately
Solution Approach 2:
The patent transitions from static evaluation methods to dynamic adaptation by continuously adjusting measurement parameters based on real-time damping characteristics. The system modifies its evaluation algorithm dynamically in response to changing medium conditions and vibration damping patterns, ensuring consistent measurement reproducibility across varying operational conditions
3Manufacturing precision
If in-line measuring devices are used for precise dosing in filling processes, then filling accuracy can be improved, but inhomogeneities in two-phase media cause overflow or underdosage
Solution Approach 1:
The patent applies feedback control by continuously monitoring damping characteristics and automatically adjusting dosing commands based on detected inhomogeneities. The system compares real-time damping measurements against reference values and dynamically compensates for measurement errors, preventing overflow and underdosage while maintaining high dosing accuracy in filling processes
Solution Approach 2:
The system takes preliminary anti-action by detecting the presence of inhomogeneities through damping analysis and proactively compensating for their harmful effects before they cause dosing errors. By identifying gas bubbles and solid particles through damping variations and pre-adjusting measurements, the system prevents overflow and underdosage events before they occur
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 significantly minimizes the impact of inhomogeneities on measurement accuracy, providing robust and repeatable results for mass flow rates and totalized mass flows, even in two- or multi-phase media, thereby ensuring precise dosing during filling processes.
Implementation Method 1
a measuring transducer of the vibration type with at least one measuring tube which vibrates at least temporarily during operation
Implementation Method 2
in the flowing medium reaction forces, such as Coriolis forces, acceleration forces, frictional forces or the like, induce and derived from these at least one measurement signal
Implementation Method 3
a damping value of reference to an anti-symmetrical damping of vibrations induced by the medium in the at least one measuring tube is determined
Data Source
Figure 1a~3b
Figure 2
Figure 4
AI summary
The invention relates to an in-line measuring device, particularly designed as a Coriolis mass flow/density measuring device and/or Coriolis mass flow/viscosity measuring device, comprising a measuring sensor (10) of the vibration type having at least one measuring tube (110) vibrating at least intermittently during operation for guiding at least intermittently – for example, as a result of loading the same with gas bubbles or solid particles – a two- or multi-phase flowable medium, having an exciter arrangement (116) acting on the measuring tube for producing vibrations of the at least one measuring tube (110), and having a sensor arrangement (117, 118) for measuring vibrations of the at least one measuring tube, said sensor arrangement providing at least one vibration measurement signal (S1, S2) representing vibrations of the measuring tube. The in-line measuring device further comprises measuring device electronics (20) which are electrically coupled with the measuring sensor and which provide at least one exciter signal (iexc) driving the exciter arrangement at least intermittently and which determine a damping value (XDI) of the first type at least intermittently. Said damping value momentarily represents an antisymmetrical damping of vibrations of the at least one measuring tube induced by a medium guided in the at least one measuring tube relative to an imaginary center plane of the at least one measuring tube which is coplanar with a cross-section of the measuring tube.