Vibronic Flowmeter Phase Error Compensation Using Dual Excitation Modes
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Solution Overview
Problem
Conventional vibronic measuring systems, such as Coriolis mass flow meters, experience significant phase errors due to electromagnetic coupling and asymmetric excitation of vibrations, leading to inaccurate mass flow rate measurements, especially in applications with varying media properties or multiple phases.
Innovation Solution
The system employs a dual operating mode for the vibration exciter, alternating between forced and free damped vibrations, allowing for the quantification and compensation of phase errors by analyzing phase differences in vibration signals during different operational modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic coupling and asymmetric excitation are used in conventional vibronic measuring systems, then the system structure is simple, but phase errors occur leading to inaccurate mass flow rate measurements
Solution Approach 1:
The system alternates between two operating modes: a first mode for normal measurement and a second mode for phase error compensation. By periodically switching between these modes, the system quantifies phase errors through controlled asymmetric excitation and then compensates them, achieving accurate mass flow rate measurements without requiring permanently complex hardware
Solution Approach 2:
The system changes operational parameters by adjusting the excitation signal characteristics in different modes. In the second mode, asymmetric excitation parameters are intentionally modified to quantify phase errors, then these parameter insights are used to compensate for errors in the first mode, improving measurement accuracy through parameter manipulation rather than structural complexity
2Measurement precision
If dual operating modes with alternating forced and free damped vibrations are implemented, then phase errors can be quantified and compensated, but the control system becomes more complex
Solution Approach 1:
The system dynamically switches between two operational states: forced vibrations in the first mode for normal operation, and free damped vibrations in the second mode for phase error quantification. This dynamic operation allows the same hardware to perform multiple functions at different times, achieving precise phase error compensation without permanently complex control mechanisms
Solution Approach 2:
The system performs preliminary phase error quantification in the second mode before returning to normal measurement in the first mode. By proactively measuring and storing phase error characteristics during the free damped vibration mode, the system prepares compensation data in advance, enabling accurate correction during subsequent measurement cycles without adding continuous operational complexity
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 approach enables accurate determination of mass flow rates by accounting for phase errors, improving measurement precision in varying flow conditions, and can be implemented with minimal software modifications to existing systems.
Implementation Method 1
Conventional vibronic measuring systems, such as Coriolis mass flow meters, experience significant phase errors due to electromagnetic coupling and asymmetric excitation of vibrations
Implementation Method 2
The at least one measuring tube of such a measuring transducer is configured to conduct medium in the lumen and to be vibrated at the same time, in particular in such a way that it carries out useful vibrations, viz., mechanical vibrations around a rest position, at a useful frequency
Implementation Method 3
bending vibrations at a natural resonant frequency typically serve as useful vibrations
Implementation Method 4
experience significant phase errors due to electromagnetic coupling and asymmetric excitation of vibrations
Implementation Method 5
allowing for the quantification and compensation of phase errors by analyzing phase differences in vibration signals during different operational modes
Data Source
AI summary
A measuring system includes: a measuring transducer having at least one measuring tube for guiding a flowing fluid measured material; an exciter arrangement; a sensor arrangement; and an electronic transformer circuit coupled to both the exciter arrangement and to the sensor arrangement and configured to generate, in a first operating mode, a first driver signal having a first signal amplitude and a first signal frequency and, a second operating mode, a second driver signal having a second signal amplitude different from the first signal amplitude and a second signal frequency, and thus in each case to feed electric power into the exciter arrangement such that the at least one measuring tube forced mechanical vibrations with a useful amplitude and frequency and configured to determine phase error measurement values representing deviations of phase angles or phase differences based on measurement signals provided during first and second measuring intervals.