Manifold Fluid Line Layout for Low-Resonance Vibronic Flow Measurement
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Solution Overview
Problem
Fluid line systems used for measuring physical parameters of fluids in pipelines often experience significant vibrations induced by sound waves, leading to measurement inaccuracies and high scatter in mass flow rate determination, particularly due to turbulent flow profiles and acoustic resonances.
Innovation Solution
The fluid line system is designed with specific flow cross-section ratios and shapes to minimize impedance jumps and reduce sound-induced vibrations, featuring enlarged flow cross-sections in the second and third fluid lines compared to the first and fourth fluid lines, and conical or cone-shaped transition regions to smoothly adapt flow areas, thereby reducing acoustic wave impedance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the fluid line system uses standard flow cross-sections without optimization, then the installation dimensions and structural simplicity are maintained, but sound-induced vibrations and measurement inaccuracies occur
Solution Approach 1:
The patent applies parameter changes by optimizing the flow cross-section areas of fluid lines. Specifically, the second and third fluid lines are designed with enlarged flow cross-sections compared to conventional designs, and conical transition regions are introduced to smoothly adapt flow areas. These parameter modifications reduce acoustic wave impedance variations, thereby minimizing sound-induced vibrations and improving mass flow rate measurement accuracy without significantly increasing structural complexity
2Ease of manufacture
If the fluid line system uses uniform flow cross-sections, then the manufacturing simplicity is maintained, but impedance jumps occur leading to acoustic resonances
Solution Approach 1:
The patent applies curvature by introducing conical transition regions in the fluid lines. These conical sections provide smooth, gradual transitions between different flow cross-section areas, eliminating abrupt impedance jumps that cause acoustic resonances. The curved/conical geometry distributes the impedance change over a extended transition zone, reducing harmful acoustic effects while remaining manufacturable using standard conical machining processes
3Object-affected harmful factors
If the flow cross-sections are enlarged in the second and third fluid lines, then sound-induced vibrations are reduced, but the installation dimensions may increase
Solution Approach 1:
The patent applies local quality by selectively enlarging the flow cross-sections only in the second and third fluid lines where acoustic vibrations occur, rather than uniformly increasing all fluid line dimensions. The conical transition regions are localized to specific sections where impedance matching is needed. This targeted approach reduces sound-induced vibrations in the critical measurement paths while minimizing the overall installation footprint
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 significantly reduces the tendency of fluid lines to produce sound-induced resonant vibrations, enhancing measurement accuracy and reproducibility by minimizing impedance jumps and acoustic resonances, while maintaining installation dimensions and structural constraints.
Implementation Method 1
designed such that an outlet-side flow cross-section, A 100,Min , of the first fluid line, the inlet-side flow cross-section, A 200a , of the second fluid line and the inlet-side flow cross-section A 300a of the third fluid line together satisfy a condition: A 100,Min ×A 200a ×A 300a≥10-18 m8 and that the outlet-side flow cross-section A 100,Min of the first fluid line, the largest flow cross-section A 200,Max of the second fluid line and the largest flow cross-section A 300,Max of the third fluid line together satisfy one condition: A 100,Min ×A 200,Max ×A 300,Max≤10-12 m8
Implementation Method 2
significantly reduces the tendency of fluid lines to perform sound-induced vibrations
Implementation Method 3
particularly due to turbulent flow profiles and acoustic resonances
Data Source
Figure 1
Figure 2
Figure 3a~3c
AI summary
The fluid line system comprises fluid lines (100, 200, 300, 400). Each of the two fluid lines (100, 400) has in each case one lumen (100*; 400*) which is enclosed by a wall, and extends from a flow opening (100a; 400a), located in a respective first line end (100+; 400+), of the respective fluid line both to a flow opening (100b; 400b) which is located in a line end (100#; 400#) of said fluid line (100; 400) and also as far as a flow opening (100c; 400c) which, spaced apart from said flow opening (100b; 400b), is likewise located in each case in the line end (100#; 400#) of said fluid line (100; 400). Each of the other two fluid lines (200, 300) in turn has a lumen (200*; 300*) which is enclosed by a wall and extends from a flow opening (200a; 300a) which is located in a line end (200+; 300+) of the respective fluid line (200; 300) as far as a flow opening (200b; 300b) which is located in a line end (200#; 300#) of said fluid line (200; 300), in such a way that a greatest flow section (A 200,Max; A300,Max) of the respective fluid line (200; 300) is spaced apart both from its line end (200+; 300+) and from its line end (200#; 300#). Both the fluid line (200) and the fluid line (300) are connected by way of their line end (200+; 300+) in each case to the line end (100#) of the fluid line (100) and by way of their line end (200#; 300#) in each case to the line end (400#) of the fluid line (400). The flow openings (200a; 200b; 300a; 300b) form in each case one inlet-side and outlet-side flow cross section (A200a; A200b; A300a; A300b) of the respective fluid line (200; 300). In addition, the fluid lines (100, 200, 300, 400) are configured in such a way that an outlet-side flow cross section (A100,min; A100,min) of the fluid line (100; 400) which is located at the line end (100#; 400#) of the fluid line (100; 400) and adjoins both the flow opening (100b; 400b) and the flow opening (100c; 400c) of said fluid line (100; 400) and flow cross sections (A200a; A200b; A300a; A300b) overall fulfil the conditions: (I) and (II), and (III) and (IV).