Coriolis Measuring Tube Quality Calculation Using Temperature and Pressure Corrections
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Solution Overview
Problem
Current methods for calculating the quality of Coriolis measuring device tubes regarding wear or deposit formation are inadequate, leading to late recognition of wear and tear, and do not meet high standards due to insufficient consideration of subtle influencing factors such as temperature and pressure variations.
Innovation Solution
A method that determines the standard vibration properties of the measuring tube by accounting for media temperature, carrier body temperature, housing temperature, and accumulated time above threshold temperatures, using temperature coefficients and mathematical models to correct for temperature-dependent material properties and aging effects, allowing for precise calculation of modal stiffness and vibration characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If back calculation is performed using only basic variables (medium temperature, carrier body temperature, housing temperature, medium density), then the calculation is simple, but wear can only be detected at a late stage and only qualitatively
Solution Approach 1:
The patent introduces additional parameters including accumulated time above threshold temperatures, media pressure, and temperature coefficients to enhance the back calculation. These new parameters enable quantitative wear detection by capturing subtle changes in vibration characteristics that were previously undetectable, thereby resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The patent implements a feedback mechanism by continuously monitoring vibration characteristics and comparing them against reference values adjusted for temperature and pressure effects. This feedback loop enables early detection of wear by identifying deviations from expected vibration patterns, transforming qualitative assessment into quantitative measurement.
2Reliability
If temperature effects on permanent magnets are not considered, then the calculation is simpler, but temperature-dependent material properties and aging effects are not corrected
Solution Approach 1:
The patent introduces temperature coefficients and accumulated time parameters to account for temperature-dependent effects on permanent magnets and other materials. By incorporating these parameters into the back calculation, the system corrects for thermal aging and magnetization changes, thereby improving measurement reliability without excessive complexity.
Solution Approach 2:
The patent performs preliminary corrections for temperature and pressure effects before conducting the wear analysis. By pre-adjusting the vibration characteristics for known environmental factors, the system isolates the wear component more accurately, enhancing reliability while keeping the overall calculation structure organized and manageable.
3Measurement precision
If media pressure is not considered in the back calculation, then the calculation is simpler, but increased media pressure causes increased measuring tube diameter and changed stiffness
Solution Approach 1:
The patent incorporates media pressure as a correction parameter in the back calculation. By adjusting the vibration characteristics for pressure-induced changes in tube diameter and stiffness, the system maintains measurement precision while accounting for the added complexity of pressure compensation.
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 more precise determination of measuring tube quality, correcting for subtle disturbances and ensuring timely detection of wear or deposit formation, thereby maintaining the reliability of Coriolis measuring devices.
Implementation Method 1
at least one magnetic device with a permanent magnet and a coil device
Implementation Method 2
a vibration system with at least one measuring tube for guiding the medium, at least one exciter configured to excite measuring tube vibrations
Data Source
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AI summary
The invention relates to a method (100) for calculating a quality regarding at least one measuring tube (11.1) of a Coriolis measuring device (10) for measuring a density or a mass flow of a medium flowing through the measuring tube, wherein a conclusion to a state of the measuring tube can be made by determining various vibration properties.