Coriolis Flow Meter Counteroscillator for Vibration Decoupling
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Solution Overview
Problem
Existing Coriolis mass flow meters with single curved measuring tubes face challenges in maintaining measurement accuracy across a wide range of fluid densities due to imbalance and lateral oscillations, leading to decreased sensitivity and increased complexity in design and assembly.
Innovation Solution
The design incorporates a counteroscillator formed by laterally arranged plates with specific centroidal line configurations and mass distributions to tune the internal part's eigenfrequencies, allowing for dynamic balancing and reduced mass while maintaining high sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a single curved measuring tube is used, then the installed length is reduced and sensitivity is improved, but measurement accuracy decreases due to imbalance and lateral oscillations
Solution Approach 1:
A counteroscillator is introduced that generates oscillations opposite to the measuring tube's oscillations. This counteroscillator acts as a counterweight to balance the imbalance caused by the single curved measuring tube, eliminating lateral oscillations and maintaining measurement accuracy while preserving the compact design benefits.
Solution Approach 2:
The counteroscillator is designed with an asymmetric mass distribution relative to the measuring tube, specifically positioned to create oscillations that are equal in frequency but opposite in phase. This asymmetric configuration enables effective cancellation of lateral oscillations without requiring additional complex balancing components.
2Device complexity
If a single curved measuring tube is used, then the device complexity is reduced, but lateral oscillations increase leading to decreased sensitivity
Solution Approach 1:
The counteroscillator serves as a counterweight element that cancels lateral oscillations generated by the single measuring tube. By generating equal and opposite oscillations, it maintains the sensitivity required for accurate measurement while keeping the overall device structure relatively simple.
Solution Approach 2:
The counteroscillator is designed to dynamically respond to the measuring tube's oscillations, adjusting its motion to maintain equal frequency and opposite phase conditions. This dynamic behavior ensures consistent cancellation of lateral oscillations across varying operating conditions without requiring complex mechanical linkages.
3Measurement precision
If the counteroscillator mass is increased to improve balancing, then measurement accuracy improves, but the device mass increases
Solution Approach 1:
Instead of uniformly increasing the counteroscillator mass throughout, the design concentrates mass strategically at specific locations within the counteroscillator structure. This localized mass distribution achieves the required balancing effect and lateral oscillation cancellation while minimizing the total mass added to the system.
Solution Approach 2:
The counteroscillator employs asymmetric mass distribution rather than symmetric uniform mass. This asymmetric configuration allows effective balancing and oscillation cancellation with less total mass, as the mass is positioned to maximize its counterbalancing effect rather than being distributed evenly.
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 enhances measurement accuracy and sensitivity by over 50% compared to previous designs, reduces the installed length of the transducer, and simplifies the internal part's construction with fewer components, effectively decoupling unwanted vibrations and maintaining high-quality oscillation decoupling.
Implementation Method 1
Curved, e.g. U, V or Ω shaped, vibrating measuring tubes can, as is known, when excited to bending oscillations according to a first eigenoscillation form, effect Coriolis forces in the medium flowing therethrough
Implementation Method 2
The counteroscillator essentially rests during operation, or it oscillates essentially equally-oppositely to the measuring tube, thus with equal frequency and opposite phase
Data Source
AI summary
The measuring transducer includes a transducer housing, as well as an internal part arranged in the transducer housing. The internal part includes at least one curved measuring tube vibrating, at least at times, during operation and serving for conveying the medium, as well as a counteroscillator affixed to the measuring tube on the inlet-side, accompanied by formation of a coupling zone, and to the measuring tube on the outlet-side, accompanied by the formation of a coupling zone. The internal part is held oscillatably in the transducer housing, at least by means of two connecting tube pieces, via which the measuring tube communicates during operation with the pipeline and which are so oriented with respect to one another, as well as with respect to an imaginary longitudinal axis of the measuring transducer, that the internal part can move during operation in the manner of a pendulum about the longitudinal axis. Counteroscillator of the measuring transducer of the invention is formed by means of two counteroscillator plates, of which a first counteroscillator plate is arranged on the left side of the measuring tube and a second counteroscillator plate is arranged on the right side of the measuring tube.