Coriolis Mass Flowmeter Pressure Measurement via Oscillation
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Solution Overview
Problem
Conventional Coriolis mass flowmeters require additional devices like strain gauges to measure pressure, which complicates the measurement process and increases costs.
Innovation Solution
A method that uses a physical-mathematical model to evaluate the oscillatory response of the measuring tube, allowing for pressure determination without additional devices by stimulating the tube at varying frequencies and natural oscillating modes, and incorporating factors like elastic rigidity, temperature, and mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gauges are used to measure pressure in the measuring tube, then pressure measurement capability is improved, but device complexity and cost increase
Solution Approach 1:
The measuring tube is made to serve multiple functions: it acts as both the flow measurement element and the pressure sensing element. By stimulating the measuring tube to oscillate and analyzing its oscillatory response, the system simultaneously determines mass flow rate and pressure without requiring separate strain gauge-based pressure measurement provisions.
Solution Approach 2:
The measuring tube itself provides the pressure measurement function through its own oscillatory characteristics. The physical-mathematical model uses the tube's natural response to stimulation to extract pressure information, allowing the system to self-measure pressure without external sensing devices attached to the tube.
2Measurement precision
If the measuring tube is stimulated in multiple oscillating modes, then measurement accuracy is improved, but the operational complexity increases
Solution Approach 1:
The system applies periodic stimulation to the measuring tube at specific frequencies corresponding to its natural oscillating modes. By using periodic excitation signals and analyzing the resulting periodic responses, the system can determine characteristic values and pressure through well-defined mathematical relationships, making the multi-mode operation manageable.
Solution Approach 2:
The system measures the oscillatory response of the measuring tube and uses this feedback information in conjunction with the physical-mathematical model to determine both mass flow rate and pressure. The response data from multiple oscillating modes provides redundant information that enhances measurement accuracy while the model processes this data to provide accurate readings.
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
Enables precise pressure measurement within the Coriolis mass flowmeter without additional hardware, improving accuracy and reducing complexity, while accounting for temperature and mechanical influences.
Implementation Method 1
the measuring tube is stimulated into oscillating, and the resulting oscillatory response of the measuring tube is measured
Implementation Method 2
mass flow meter that employs the Coriolis principle
Implementation Method 3
the physical-mathematical model factors in the effective elastic rigidity of the measuring tube
Data Source
AI summary
A method for operating a mass flowmeter that employs the Coriolis principle and through which flows a medium, the flowmeter including a measuring tube through which passes a medium, which measuring tube is stimulated into oscillating and the resulting oscillatory response of the measuring tube is measured includes the step of gauging the pressure of the medium flowing through the measuring tube by evaluating the collected oscillatory response on the basis of a physical-mathematical model for the dynamics of the mass flowmeter. Thus, without requiring any additional devices, it is possible for a Coriolis mass flowmeter, apart from measuring the mass flow, to also measure the pressure in the measuring tube.