Modification of the equation for mass flow rate (mass) measurement of liquid with account of dynamic influencing factors

Щелчков, А. В.; Fafurin, V. A.; Korneev, R. A.; Tukhvatullin, R.R.

doi:10.1016/j.flowmeasinst.2021.102117

Cited by 5 publications

(1 citation statement)

References 5 publications

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“…Regarding dynamic measurement technology, there are studies focusing not only on geometric measurement, but also on flow measurement and vibration measurement. Considering the liquid flow fluctuation and turbulent pulsation, Shchelchkov et al modified the mass flow measurement equation and conducted a comparative experiment with the transfer standard [18]; Jia Binghui proposed a method to measure the vibration at the tip of a 2D tool with the mirror light beam and to measure the transverse and longitudinal vibration displacement at the tip of the tool [19]. At present, there are many studies on static calibration of tracker performance in China.…”

Section: Introductionmentioning

confidence: 99%

Research on Radial Double Velocity Measurement Method of Laser Tracker

Lv,

Hu,

et al. 2024

Processes

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For the dynamic problem that the low-speed sliding table is unable to meet the radial measuring speed of the laser tracker, this paper takes the sliding table of the indoor large-length standard device as the moving object to double the measuring distance by adding a pyramid prism, thereby doubling the radial speed of the laser tracker. In this paper, the measurement data are analyzed through equal interval measurement experiments, equal sampling frequency experiments and repeatability measurement experiments using a pyramid prism to obtain the following conclusions, respectively: Firstly, the stability of the actual interval of the laser tracker is optimal when the rated speed of the sliding table is 50 mm/s. When the pyramid prism is not used, the minimum standard deviation obtained by the laser tracker at a sampling interval of 5 mm is 0.0158 mm. Secondly, during the equal sampling frequency measurement, the stability of the laser interferometer is better than that of the laser tracker when the pyramid prism is not used. With two instruments at a sampling frequency of 10 Hz, the standard deviations of the local velocity of the laser interferometer are 0.1466 mm/s, 0.0693 mm/s and 0.1106 mm/s, respectively. The standard deviations of the laser tracker are 0.1582 mm/s, 0.1033 mm/s and 0.2008 mm/s, respectively. The same conclusion is obtained at a sampling frequency of 20 Hz. The stability of the laser tracker is better than that of the laser interferometer when the pyramid prism is used. Thirdly, the stability and reliability of the local velocity of the laser tracker are better than that of the laser interferometer. For example, at 10 Hz, the standard deviations of the local velocity of the laser tracker are 0.2745 mm/s and 0.2097 mm/s, respectively, and the repeatability of the local velocity is 0.9140 mm/s. The standard deviations of the local velocity of the interferometer are 0.6141 mm/s and 0.6368 mm/s, respectively, and the repeatability of the local velocity is 1.4886 mm/s. And the local velocity of the two measuring instruments is more reliable and stable at a low frequency (10 Hz). This experimental scheme provides a way to measure the high speed of a laser tracker using a sliding table at low speed.

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Section: Introductionmentioning

confidence: 99%

Research on Radial Double Velocity Measurement Method of Laser Tracker

Lv,

Hu,

et al. 2024

Processes

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New switching gate diverter valve for large flow measurement systems

Albaïna¹,

Esteban²,

Albaina³

et al. 2023

Flow Measurement and Instrumentation

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Inf uence of the variable geometry of the diverter nozzle on the metrological characteristics of a calibration unit with weighing devices

Korneev,

Shchelchkov,

Korneev

2023

jour

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This article discusses the issues of improving the metrological characteristics, weight-dimensional and technical and economic indicators of calibration installations with weighing devices due to the introduction of a fl ow switch with a variable nozzle exit geometry into their design. It is assumed that the use of this design of the fl ow switch will solve the problem of fi lling the nozzle exit with water, reduce the dimensions of the hydraulic path, simplify the maintenance procedure, and reduce the cost of installations. A description of the design, principles of operation and a timing diagram of a fl ow switch with a variable nozzle exit geometry are presented. The local hydrodynamic characteristics of the water fl ow by a Pitot tube in the nozzle exit are studied with a change in its width in the mass fl ow rate range from 25 to 550 t/h. The optimal values of the nozzle cut width are experimentally determined depending on the value of the mass fl ow rate of the liquid, at which it is completely fi lled with liquid. A study of the metrological characteristics of a calibration installation with weighing devices, which includes a fl ow switch with a variable nozzle exit geometry, methods of indirect measurements and comparisons using a comparison standard in a wide range of liquid mass fl ow rates, has been carried out. The impact on the metrological characteristics of a calibration installation with weighing devices of the nozzle cut width in the investigated range of liquid fl ow is established. Graphical dependences of the expanded measurement uncertainty of the installation when reproducing the unit of liquid mass fl ow rate on the measurement time interval and on the mass fl ow rate of the liquid are presented. Based on the research results, the optimal values of the nozzle cut width and measurement time intervals were determined depending on the mass fl ow rates of the liquid when using a fl ow switch with a variable nozzle cut geometry. The expansion of the range of operation of weighing devices, which are part of the verifi cation installations with weighing devices, is justifi ed. According to the results of the research, the proposed design of the fl ow switch with a variable geometry of the nozzle exit is recommended for use in the design of new and modernization of installations for calibration with weight devices of fl ow switches.

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Modification of the equation for mass flow rate (mass) measurement of liquid with account of dynamic influencing factors

Cited by 5 publications

References 5 publications

Research on Radial Double Velocity Measurement Method of Laser Tracker

Research on Radial Double Velocity Measurement Method of Laser Tracker

New switching gate diverter valve for large flow measurement systems

Inf uence of the variable geometry of the diverter nozzle on the metrological characteristics of a calibration unit with weighing devices

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