Vibrating Densitometer Inner Surface Raised Portions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vibrating densitometers face challenges in achieving sufficient resonant frequency mode separation due to design tolerances, leading to impractical density measurements, particularly when trying to distinguish between closely spaced three-lobed radial vibration modes, which often results in low product yield and precision issues during manufacturing.
Innovation Solution
The use of wire electrical discharge machining (EDM) to precisely cut raised portions on the inner surface of the vibrating member, allowing for increased frequency separation between desired and undesired vibrational modes, while maintaining a cylindrical outer shape, thereby enhancing the accuracy of density measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional grinding methods are used to separate vibrational modes, then manufacturing complexity is reduced, but manufacturing precision and frequency separation are insufficient
Solution Approach 1:
The patent replaces traditional mechanical grinding methods with wire electrical discharge machining (EDM). This substitution enables precise cutting of raised portions on the inner surface of the vibrating member, achieving the required frequency separation between vibrational modes while maintaining manufacturing feasibility. The wire EDM process provides the necessary precision without the limitations of conventional grinding.
2Reliability
If design tolerances are relaxed to simplify manufacturing, then ease of manufacture improves, but resonant frequency mode separation becomes insufficient
Solution Approach 1:
The patent changes the manufacturing parameters by adopting wire EDM technology, which enables tight tolerances and precise dimensional control. This parameter change allows for the creation of raised portions with specific dimensions and positions on the inner surface, ensuring reliable frequency separation while maintaining ease of manufacture through automated precision machining.
3Measurement precision
If precision cutting methods are used to improve frequency separation, then measurement accuracy improves, but productivity decreases
Solution Approach 1:
The patent applies preliminary action by designing and forming the raised portions on the inner surface during the manufacturing process itself, rather than attempting to achieve frequency separation through post-manufacturing adjustments or selective testing. The wire EDM process creates the precise geometry needed for mode separation upfront, ensuring both measurement accuracy and manufacturing productivity.
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 provides improved resonant frequency mode separation, increasing the accuracy of density measurements and maintaining a higher product yield by allowing for precise and repeatable cutting of complex shapes, overcoming the limitations of traditional grinding methods.
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
Conversely, the vibration of the vibrating member 12 induces a voltage in the vibrating sensor 17.
Implementation Method 3
As the vibrating member 12 vibrates, the fluid contacting the vibrating member's wall vibrates along with the vibrating member 12. The added mass of the fluid contacting the vibrating member 12 lowers the resonant frequency.
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A vibrating member (500) for a vibrating densitometer (800) is provided. The vibrating member (500) includes an inner surface (531) with one or more arcuate portions (730). The inner surface (531) of the vibrating member (500) also includes one or more raised portions (530) sized and located 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.