scholarly journals Methods of reduction of interference signals in electromagnetic conductors that measure fluid flow

2021 ◽  
Vol 2094 (5) ◽  
pp. 052053
Author(s):  
Sulton F Amirov ◽  
Aminjon O Ataullaev ◽  
Muzaffar K Sayidov ◽  
Islomjon B Togayev

Abstract The pressure in the fluid flow, especially in the pipes of closed water supply systems, is generated mainly by pumps, and the water flow is usually pulsating. Electromagnetic transducers used to measure such nonstationary and pulsating fluid flow rates must have low inertia and high dynamic accuracy. In such cases, the frequency characteristics of electromagnetic transducers that measure fluid flow are their main parameters. It should be noted that the performance of the converters used to measure the flow rate of pulsating fluids should not depend on the change in the distribution profile of the flow velocities, otherwise additional measurement errors will occur. It is used in measuring non-stationary and pulsating fluid flow rates in controlled and controlled technological processes.

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Sadia Bakhtiar ◽  
Farid Ullah Khan

This paper presents the analytical modeling and simulation of an electromagnetic energy harvester (having linear behaviour) that generates power from pulsating fluid flow for pipeline condition monitoring systems. The modeled energy harvester is comprised of a cylindrical permanent magnet and a wound coil attached to a flexible membrane which oscillates due to the pulsating fluid flow in the pipe over which the prototype is considered to be mounted. In the harvester electrical energy is produced due to the relative motion between the coil and magnet. Based on the harvester’s architecture a lumped parameter model (single degree of freedom system) is developed and is simulated at different physical operational conditions. The simulation is performed at pressure amplitude of 625 Pa. When subjected to the operational frequency sweep, at the harvester’s resonant frequency (500 Hz) and damping ratio of 0.01, the devised model predicted the maximum open circuit voltage of 2.55 V and load voltage of 1.27 V. While operating under resonance, the maximum load voltage of 2.45 V is estimated at load resistance of 100 Ω. However, at an optimum load of 4.3 Ω, the simulation shows a production of 188151.2 μW power at a frequency of 500 Hz.


2021 ◽  
Vol 264 ◽  
pp. 01043
Author(s):  
Irina Okhremenko ◽  
Abdumalik Rizaev

The article discusses modern schemes for the treatment of oily wastewater from transport enterprises. The features of closed water supply systems and the fundamental provisions for the design of a compact module for wastewater treatment of transport enterprises are revealed.


Author(s):  
O. Primin

При устройстве объединенных систем хозяйственно-питьевого и противопожарного водоснабжения значение распределительной сети возрастает еще больше, так как на нее возлагаются дополнительные функции по транспортировке больших расходов воды на пожаротушение. Обеспечение противопожарных требований в условиях значительного снижения водопотребления в большинстве городов России приводит к негативным последствиям, связанным с малыми (0,10,3 м/с и менее) скоростями течения и застаиванием воды на отдельных участках сети. Из-за этого возможно ухудшение органолептических свойств воды, что выражается в появлении привкусов, неприятных запахов, повышении мутности и цветности и т. д. В связи с этим требуется проведение мероприятий для оптимизации выбора диаметров труб, обеспечения и сохранения требуемого качества транспортируемой воды в наружных городских и распределительных сетях, гарантированного обеспечения требуемых норм на пожаротушение. Приведены результаты исследований и гидравлические расчеты по оценке минимально допустимых скоростей движения воды и минимальных диаметров труб внутриквартальных сетей с учетом обеспечения наружного и внутреннего пожара. Испытания проведены в реальных условиях кольцевой водопроводной сети города в зонах повышенного и пониженного давления.With the arrangement of combined drinking water and fire water supply systems, the importance of the distribution network increases even more, since additional functions are assigned to provide for the transportation of large amounts of water for firefighting. Meeting the firefighting requirements in conditions of a significant reduction in water consumption in most cities of Russia leads to negative consequences associated with low (0.10.3 m/s and less) flow rates and stagnation of water in some sections of the distribution network. Thereby, the organoleptic properties of water may deteriorate expressed in the appearance of flavors, unpleasant odors, increased turbidity and color, etc. In this regard, measures are required to optimize the choice of pipe diameters, to ensure and maintain the required quality of transported water in outdoor urban and distribution networks, and to guarantee meeting the required fire extinguishing standards. The research results and hydraulic calculations for assessing the minimum permissible water flow rates and minimum pipe diameters of submain networks are given taking into account the provision of external and internal firefighting. The tests were carried out in real conditions of the municipal water supply ring main in high- and low-pressure zones.


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