Vibration Transducer Coupling Elements for Eigenfrequency Tuning
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Solution Overview
Problem
Existing methods for tuning measuring transducers of the vibration-type are complex and introduce deviations from ideal geometry, making it difficult to prevent imbalances and accurately set eigenfrequencies, especially in later production phases.
Innovation Solution
A measuring transducer with a tube arrangement connected by coupling elements that allow for precise adjustment of eigenfrequencies by modifying the bending stiffness of these elements, using techniques like volume removal to achieve target frequencies without plastic deformation of the tubes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex tuning methods are used to set eigenfrequencies, then measurement precision is improved, but device complexity increases and manufacturing precision deteriorates due to geometric deviations
Solution Approach 1:
The coupling elements are designed as separate, discrete components that can be independently adjusted. By segmenting the tuning function into individual coupling element adjustments rather than complex global tuning, the method simplifies the overall process while maintaining precision in eigenfrequency setting.
Solution Approach 2:
The coupling elements are pre-adjusted to achieve target eigenfrequencies before final assembly. This preliminary adjustment of bending stiffness through volume removal allows the tube arrangement to be tuned in advance, avoiding complex post-assembly tuning procedures and preventing geometric deviations.
2Manufacturing precision
If volume removal from coupling elements is performed, then manufacturing precision is improved by preventing plastic deformation, but device complexity increases due to additional manufacturing steps
Solution Approach 1:
The problematic plastic deformation step is extracted and replaced with volume removal from coupling elements. By removing material from the coupling elements rather than deforming the tubes, the method achieves precise geometry without the harmful effects of plastic deformation, even though it adds a manufacturing step.
Solution Approach 2:
The coupling elements serve as intermediary components that absorb the tuning adjustments. Instead of directly modifying the measuring tubes, the coupling elements are adjusted to achieve the desired eigenfrequencies, protecting the tube geometry from deformation while still enabling precise frequency control.
3Adaptability or versatility
If coupling elements with different bending stiffness are used, then adaptability is improved for frequency tuning, but manufacturing precision deteriorates due to asymmetry requirements
Solution Approach 1:
The invention deliberately introduces asymmetry in the coupling elements by removing different volumes from each side. This controlled asymmetry in the coupling elements (not the tubes) enables precise eigenfrequency tuning while maintaining symmetry in the critical measuring tubes, thus improving adaptability without compromising tube manufacturing precision.
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 simplifies and effectively trims eigenfrequencies to desired targets, preventing detuning and imbalances, and can be applied to both new and existing transducers, ensuring precise operation and reducing the risk of oscillation mode shifts.
Implementation Method 1
measuring transducer of vibration-type... causing the at least one tube to vibrate for ascertaining the interim eigenfrequency
Implementation Method 2
bending stiffness of the first coupling element... bending stiffness of the second coupling element
Data Source
AI summary
A measuring transducer comprises a housing, and a tube arrangement formed by means of at least two tubes extending within the housing. At least one tube is embodied as a measuring tube serving for conveying flowing medium and another tube is mechanically connected with the tube by means of a coupling element to form an inlet-side coupling zone and by means of a coupling element. The coupling element is arranged equally far removed from the housing end. One coupling element has, about an imaginary longitudinal axis of the tube arrangement imaginarily connecting a center of mass of the coupling element and a center of mass of the other coupling element, with an angle of intersection equal to that with the other coupling element, a bending stiffness, which deviates from a bending stiffness of the other coupling element about said imaginary longitudinal axis of the tube arrangement.