STUDY ON GEOMETRIC PARAMETER MEASUREMENT AND WEIGHT COEFFICIENT CORRECTION OF ULTRASONIC FLOWMETER |
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| He-ming Hu, Tao Meng, Feng Gao, Liang Zhang, Chi Wang |
- Abstract:
- Geometric parameter measurement system for multi-path ultrasonic flowmeters based on Leica total station has been established, which can directly measure the 3D coordinates of the conduit points and sensor points and automatically calculate geometric parameters of the flowmeter. Compared with the traditional method using the theodolite and steel tape, the first advantage of this system is the high efficiency and good accuracy, and the second is the path heights can be re-measured after the sensor mounted. Cylinder fitting is its key problem. Lukács algorithm is introduced for the cylinder fitting, and Monte-Carlo simulation method is introduced for its uncertainty estimation.To illustrate the rationality and validity of this measurement system, the calibration data and its uncertainty of 3 flowmeters in three gorges power station have been comparative analysed. Besides, the influences of the water temperature and pressure on the diameter of three gorges steel penstock and then on the other parameters have be estimated. At last, the effect on the flow rate of the path heights which are different from the design values has been analysed. When this effect is not ignorable, the analytical formulas has been deduced for the weight coefficient correction, which can get satisfactory weight coefficient.
- Keywords:
- ultrasonic flowmeter, geometric parameter, total station, Faro arm, cylinder fitting, uncertainty, weight coefficient
- Download:
- IMEKO-TC9-2013-108.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC9
- Event name:
- FLOMEKO 2013
- Title:
16th International Flow Measurement Conference
- Place:
- Paris, FRANCE
- Time:
- 24 September 2013 - 26 September 2013