Vibration Sensor Elastic Coupler Resonance Matching
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Solution Overview
Problem
Existing vibration-type sensors for measuring medium density and mass flow rate experience mechanical stresses and reduced accuracy due to rigid coupling of measuring tubes, leading to significant deviations in resonant frequencies.
Innovation Solution
The sensor design incorporates curved measuring tubes with a weak elastic vibration coupler, allowing them to vibrate in phase and counterphase modes with resonant frequencies that differ by no more than 8%, minimizing mechanical stresses and crosstalk, and featuring a support structure with collectors and gusset plates for fluidic connection and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If measuring tubes are rigidly coupled to oscillators, then structural stability is improved, but mechanical stresses and constraining forces increase, impairing measuring accuracy and sensitivity
Solution Approach 1:
The patent changes the coupling stiffness parameter from rigid to elastic, allowing the vibration coupler to deform elastically during operation. This parameter change reduces constraining forces on the measuring tubes while maintaining structural stability, thereby resolving the contradiction between structural stability and measuring accuracy
2Reliability
If measuring tubes have great deviation in resonant frequencies, then individual tube characteristics are preserved, but constraining forces and mechanical stresses between coupled tubes increase
Solution Approach 1:
The patent introduces dynamic elasticity to the coupling system, allowing the vibration coupler to adapt its stiffness characteristics during vibration cycles. This dynamic coupling accommodates frequency deviations between tubes while minimizing constraining forces, resolving the contradiction between preserving tube characteristics and reducing mechanical stresses
3Force
If a weak elastic vibration coupler is used, then mechanical stresses are reduced, but coupling strength between measuring tubes decreases
Solution Approach 1:
The patent employs an elastic vibration coupler that functions as a flexible coupling element between measuring tubes. This flexible coupling reduces mechanical stresses by allowing elastic deformation while maintaining sufficient coupling strength through controlled elasticity, resolving the contradiction between reducing stresses and maintaining coupling strength
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 design enhances measuring accuracy and sensitivity by reducing mechanical stresses and maintaining low vibration coupler forces, preventing plastic deformations and ensuring precise phase separation of vibration modes.
Implementation Method 1
at least one first elastic vibration coupler, which couples the first measuring tube and the second measuring tube together to the oscillator
Implementation Method 2
the first measuring tube is designed to vibrate in a first bending vibration mode, which is mirror-symmetrical in relation to the first measuring tube transverse plane
Data Source
AI summary
The present disclosure relates to a vibration-type sensor for measuring the density and/or the mass flow rate of a medium, having at least one first oscillator, the sensor including: a curved first measuring tube; a curved second measuring tube; at least one first elastic vibration coupler that couples the first measuring tube and the second measuring tube to each; and at least one exciter for exciting oscillator vibrations in a bending vibration mode. The oscillator has a first oscillator resonant frequency for when the measuring tubes vibrate approximately in phase in the bending vibration mode and a greater second oscillator resonant frequency for when the measuring tubes vibrate approximately in counterphase in the bending vibration mode. The first and second measuring tubes have resonant frequencies differing from their arithmetic mean by no more than 8%, no more than 4%, no more than 2% or no more than 1%.