Vibrating Member Apertures for Densitometer Mode Separation
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Solution Overview
Problem
Existing vibrating densitometers face challenges in achieving sufficient frequency separation between desired and undesired vibrational modes, leading to impractical density measurements due to small resonant frequency differences, which is exacerbated by manufacturing limitations and low product yield.
Innovation Solution
The introduction of strategically sized and located apertures in the vibrating member to increase frequency separation between the desired vibrational drive mode and undesired modes, allowing for more precise positioning of the driver and sensor and improving manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the vibrating member is designed without additional apertures to maintain structural simplicity, then manufacturing is easier, but the frequency separation between desired and undesired vibrational modes is insufficient
Solution Approach 1:
The vibrating member is segmented by introducing additional apertures that divide the structure into distinct regions with different vibrational characteristics. These apertures create localized mass and stiffness variations that increase the frequency separation between desired and undesired vibrational modes, allowing for more precise mode identification and measurement.
2Measurement precision
If the resonant frequency difference between vibrational modes is small to maintain measurement sensitivity, then density measurement precision is improved, but the ability to distinguish between modes becomes difficult
Solution Approach 1:
The vibrating member incorporates apertures at specific locations where the local mass and stiffness properties are modified to create distinct vibrational mode characteristics. This local modification allows the desired mode to maintain its sensitivity for density measurement while the undesired modes are shifted to different frequencies, making mode identification easier through strategic placement of structural features.
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 the frequency separation between vibrational modes, improving the accuracy of density measurements and increasing the production yield by allowing for easier identification of the desired vibrational mode and more precise aperture sizing.
Implementation Method 1
If an electric current is provided to the coil, a magnetic field is induced in the vibrating member 12 causing the vibrating member 12 to vibrate.
Implementation Method 2
The conduit can be vibrated at resonance and the resonant frequency can be measured. As is generally known in the art, the density of the fluid under test can be determined by measuring the reduced resonant frequency of the conduit.
Implementation Method 3
Conversely, the vibration of the vibrating member 12 induces a voltage in the vibrating sensor 17.
Data Source
AI summary
An apparatus is provided that comprises a vibrating member (402). The vibrating member (402) is for a vibrating densitometer (400). The vibrating member (402) includes one or more apertures (420). The one or more apertures (420) are sized and located in the vibrating member (402) to increase a frequency separation between a resonant frequency of a desired vibrational drive mode and a resonant frequency of one or more undesired vibrational modes.