Vibronic Measuring Tube Phase Compensation During Free Vibration
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Solution Overview
Problem
Conventional vibronic measuring systems, particularly Coriolis mass flow meters, experience significant phase errors due to electromagnetic coupling and asymmetric damping of vibrations, leading to inaccurate mass flow rate measurements, especially in applications with rapidly changing media densities, inhomogeneous media, or medium cycles.
Innovation Solution
The system alternates between active excitation and free damped vibrations of the measuring tube, using phase angle measurements during both modes to determine and compensate for phase errors, allowing for more accurate mass flow rate calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If active excitation is continuously applied to maintain vibrations, then measurement can be performed without interruption, but phase errors occur due to electromagnetic coupling and asymmetric damping
Solution Approach 1:
The patent implements periodic alternation between active excitation mode and free damped vibration mode. During free damped vibration periods, the excitation signal is suspended to eliminate electromagnetic coupling interference, allowing accurate phase error measurement. This periodic switching resolves the contradiction by accepting brief measurement interruptions in exchange for significantly improved phase accuracy.
Solution Approach 2:
The system performs preliminary measurement of phase errors during free damped vibration modes before returning to active measurement mode. By capturing phase error characteristics when electromagnetic coupling is absent, the system can subsequently compensate for these errors during continuous active excitation, improving overall measurement precision without sacrificing continuity.
2Measurement precision
If phase error compensation is implemented, then measurement accuracy improves, but system complexity increases due to additional measurement modes and processing
Solution Approach 1:
The patent employs feedback by measuring phase errors during free damped vibration modes and using this information to compensate for phase errors during active measurement modes. The measured phase error characteristics feed back into the measurement process, enabling automatic correction and improving mass flow rate accuracy without requiring complex external calibration systems.
Solution Approach 2:
The measuring tube serves multiple functions: it acts as both the measurement element during active excitation and as a test element for characterizing phase errors during free damped vibration. This multi-functionality eliminates the need for separate calibration apparatus, reducing system complexity while maintaining improved measurement accuracy.
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 precise quantification and compensation of phase errors, improving the accuracy of mass flow rate measurements in varying fluid conditions.
Implementation Method 1
significant phase errors due to electromagnetic coupling and asymmetric damping of vibrations
Implementation Method 2
asymmetric damping of vibrations
Implementation Method 3
using phase angle measurements during both modes to determine and compensate for phase errors
Data Source
AI summary
A measuring system comprises a measuring transducer having at least one measuring tube, an exciter arrangement, a sensor arrangement and an electronic transformer circuit having measurement and control electronics and having drive electronics connected to the measurement and control electronics and/or controlled by the measurement and control electronics. The drive electronics is designed, controlled by the measurement and control electronics, to generate an electrical driver signal in a first operating mode and thereby to feed electrical power into the exciter arrangement such that the at least one measuring tube executes forced mechanical vibrations at a vibration frequency predefined by the electrical drive signal at least during a first measuring interval, and in a second operating mode, to suspend generation of the electrical driver signal in such a manner that no electrical power is fed into the exciter arrangement by the drive electronics during said suspension.