2006 Fiscal Year Final Research Report Summary
Study of the oscillating LPA Flow Sensor
| Project/Area Number |
17560218
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Dynamics/Control
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| Research Institution | Ichinoseki National College of Technology |
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Principal Investigator |
SHIMIZU Hisaki Ichinoseki National College of Technology, Department of Intelligent Systems Engineering, Professor, 制御情報工学科, 教授 (20099766)
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| Project Period (FY) |
2005 – 2006
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| Keywords | Measurement Engineering / Control Engineering / Precision Machining / Fluid Engineering |
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| Research Abstract |
The oscillating LPA(Laminar Proportional Amplifier) flow sensor having bilateral feedback loops is available for the measurement of small volume flow, because LPA is operated efficiently under the condition of low Reynolds number, i.e., laminar flow. Pattern of LPA and feedback loops were sculpted thin stainless steels on a flat plane. They were manufactured by an electric discharge machine accurately.
The relationship between the oscillating frequency and the geometry of the oscillating LPA flow sensor were studied. Following conclusions were obtained.
1) The thin feedback loops has a highly inhibitory action against the flow turbulent.
2) In the case of sensor which was made to width bs=0.3mm, depth h=0.3mm of supply nozzle, there are the lower limit of flow rate for oscillation at 0.7cc/s.
3) The signal transport time through the feedback loops were affected considerably by the geometry of the feedback loop. The structure which arranged the ports of LPA and feedback loops in the same plane have the advantage in expanding working range. The signal transport time through the feedback loops occupied about 20% of the oscillation period.
4) The signal transport velocities in the input nozzle and in the output nozzle were smaller than that of the feedback loop. Those signal transport time occupied about 10% of the oscillation period.
5) The signal transport time from the supply nozzle to the splitter occupied about 60% of the oscillation period. The calculation of the oscillating frequency was possible.
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Research Products
(10 results)
