Vibration Measurement Device Phase Shift Frequency Control
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Solution Overview
Problem
Measurement devices of the vibration type face issues with frequency instabilities and nonlinear effects due to noisy vibration signals, which affect the accuracy of fluid flow rate and density measurements.
Innovation Solution
The process involves exciting the measurement device at its natural frequencies using an adjustable excitation frequency and determining the phase shift between the response signal and the force, which is used to automatically adjust the excitation frequency through a frequency controller, ensuring optimal vibration excitation and reducing noise and frequency instabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the measured vibration signal is amplified and fed back to the exciter arrangement, then the vibration amplitude is maintained, but frequency instabilities and nonlinear effects occur due to noise
Solution Approach 1:
The patent implements feedback by measuring the vibration signal and using the determined natural frequency to adjust the excitation frequency. The controller continuously monitors the vibration signal, determines the natural frequency from it, and adjusts the exciter arrangement to operate at the determined natural frequency, creating a closed-loop feedback system that maintains accurate operation despite changes in system conditions
Solution Approach 2:
The patent changes the excitation frequency parameter dynamically based on the determined natural frequency. Instead of using a fixed excitation frequency, the system continuously determines the natural frequency from the vibration signal and adjusts the excitation frequency to match, thereby adapting to changes in flow rate and density that alter the system's natural frequency
2Measurement precision
If the excitation frequency is adjusted to match natural frequency, then measurement precision is improved, but the system complexity increases due to frequency control requirements
Solution Approach 1:
The system determines the natural frequency from its own vibration signal and uses this information to self-adjust its excitation frequency. The measurement device serves itself by extracting the natural frequency information from its operational vibration signal and automatically adjusting its excitation parameters without requiring external calibration or complex control systems
Solution Approach 2:
The vibration signal serves multiple functions: it is used for measurement purposes and simultaneously provides the information needed to determine the natural frequency for excitation control. The same measured vibration signal that would normally only be used for flow rate determination is also utilized to identify the natural frequency, eliminating the need for separate frequency identification systems
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 allows for precise and stable measurement of fluid flow rates and densities by adapting to altered natural frequencies, minimizing noise and frequency instabilities, and maintaining maximum amplitude of the analyzed signal.
Implementation Method 1
a measurement device of the vibration type in which a measurement tube through which the measurement medium flows is excited to vibrations
Implementation Method 2
the amplitude of the measured vibration signal is maximum when the vibration system is excited to its natural frequency
Implementation Method 3
A measurement device of the vibration type is also known as a Coriolis measurement device in which a measurement tube through which the measurement medium flows is excited to vibrations
Data Source
AI summary
A process is disclosed for operating a measurement device of the vibration type in which at least one exciter arrangement excites the system to vibration and from the vibration parameters, a measurement quantity of a measurement medium in a tube system is determined. A time-dependent force f(t)=F sin(ωt)+g(t) with at least one sinusoidal component with an adjustable frequency ω can be used which acts on at least one vibration-capable part of the measurement device of the vibration type. A response signal of the vibration-capable part, (e.g., its time dependent velocity v(t)=V sin(ωt+ψ)+h(t)) can be measured, and a phase shift Ψ between the response signal and the force f of a signal component which oscillates with a frequency ω is determined. The phase shift Ψ can be used as the input for a frequency controller so that the excitation frequency is automatically adjusted as a function of Ψ.