Academic literature on the topic 'Flowrate control'

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Journal articles on the topic "Flowrate control"

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Peng, Shuang, Fanglong Yin, and Yong Hu. "An Improved Zero-Flowrate Switching Control Method to Reduce Switching Losses in a Hydraulic Actuator." Actuators 13, no. 4 (2024): 137. http://dx.doi.org/10.3390/act13040137.

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Hydraulic switching actuators are high-efficiency, fast response, and low-cost solutions for hydraulic control systems. One of the challenging problems is throttling losses during valve transitions. Previously, the authors proposed a zero-flowrate switching method to reduce the throttling energy loss of the switching valve, where a hydraulic resonator is applied to make the flowrates through the lines approaching zero before the valves are switched off. The major challenge of this approach is fast switching valves whose transition times are less than 2 ms. In this paper, an improved zero-flowr
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Avila, Raudel, Yixin Wu, Rinaldo Garziera, John A. Rogers, and Yonggang Huang. "Analytical Modeling of Flowrate and Its Maxima in Electrochemical Bioelectronics with Drug Delivery Capabilities." Research 2022 (March 4, 2022): 1–13. http://dx.doi.org/10.34133/2022/9805932.

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Flowrate control in flexible bioelectronics with targeted drug delivery capabilities is essential to ensure timely and safe delivery. For neuroscience and pharmacogenetics studies in small animals, these flexible bioelectronic systems can be tailored to deliver small drug volumes on a controlled fashion without damaging surrounding tissues from stresses induced by excessively high flowrates. The drug delivery process is realized by an electrochemical reaction that pressurizes the internal bioelectronic chambers to deform a flexible polymer membrane that pumps the drug through a network of micr
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Saiz-Rubio, Verónica, Coral Ortiz, Antonio Torregrosa, et al. "Modelling Vineyard Spraying by Precisely Assessing the Duty Cycles of a Blast Sprayer Controlled by Pulse-Width-Modulated Nozzles." Agriculture 13, no. 2 (2023): 499. http://dx.doi.org/10.3390/agriculture13020499.

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The flowrate control of spraying systems with pulse-width-modulated solenoid valves is currently being implemented for precision herbicide application in commodity crops, but solutions for fruit trees set in orchards that require higher pressures are mostly in the development stage. A reason for this has been the higher flowrate and pressure requirements of blast sprayers used for dense canopies typical of high value crops. In the present study, the duty cycles preset by an operator were compared to the actual ones estimated from measuring flowrates. A new developed air-assisted orchard spraye
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Li, Dong, Jie Hang, Yunhua Li, and Sujun Dong. "Fuel Flowrate Control for Aeroengine and Fuel Thermal Management for Airborne System of Aircraft—An Overview." Applied Sciences 12, no. 1 (2021): 279. http://dx.doi.org/10.3390/app12010279.

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Fuel flowrate control system and fuel thermal management are very important for aeroengine and the overall aircraft, and it has been researched for several decades. This survey paper makes a comprehensive and systematic overview on the exiting fuel flowrate regulation methods, thermal load of fuel metering units, fuel-based thermal management, and the fuel tank’s thermal management topology network with drain and recirculation. This paper firstly reviews the mechanism, technical advantages, and technical challenges of the fuel metering unit with flowrate control valve and constant pressure dif
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Dragunov, A. I., and K. A. Trukhanov. "METHODOLOGY FOR CALCULATING THE FLOW-RATE CHARACTERISTICS OF A CHEMICAL INJECTION METERING (THROTTLE) VALVE WITH A LAMINAR AND TURBULENT STAGE OF A SHUT-OFF AND CONTROL ELEMENT." Spravochnik. Inzhenernyi zhurnal, no. 325 (April 2024): 24–38. http://dx.doi.org/10.14489/hb.2024.04.pp.024-038.

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The article discusses the methodology for calculation the flowrate-drop characteristic of chemical injecting valve with a laminar and turbulent stage of a locking and regulating element (LRE). Three types of chemicals widely used in the oil industry are used as input data. In addition, the calculation was made for three different flowrates of these types of chemicals. It is shown that, in contrast to the “cone to edge” valve type of reverse flowrate, with the use of two-stage LRE, a linear from of the flow-difference characteristic and the flow characteristic of the valve is achieved. The depe
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HABIB, ROBERT SH, and QAIS A. H. ALNOUMAN. "Microcomputer-based liquid flowrate control system." International Journal of Electronics 65, no. 1 (1988): 117–25. http://dx.doi.org/10.1080/00207218808945210.

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Shen, Hai-Feng, Xin-Jian Zhu, Meng Shao, and Hong-fei Cao. "Neural Network Predictive Control for Vanadium Redox Flow Battery." Journal of Applied Mathematics 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/538237.

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The vanadium redox flow battery (VRB) is a nonlinear system with unknown dynamics and disturbances. The flowrate of the electrolyte is an important control mechanism in the operation of a VRB system. Too low or too high flowrate is unfavorable for the safety and performance of VRB. This paper presents a neural network predictive control scheme to enhance the overall performance of the battery. A radial basis function (RBF) network is employed to approximate the dynamics of the VRB system. The genetic algorithm (GA) is used to obtain the optimum initial values of the RBF network parameters. The
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Amanowicz, Łukasz. "Controlling the Thermal Power of a Wall Heating Panel with Heat Pipes by Changing the Mass Flowrate and Temperature of Supplying Water—Experimental Investigations." Energies 13, no. 24 (2020): 6547. http://dx.doi.org/10.3390/en13246547.

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Renewable energy sources for the purpose of heating buildings cooperate perfectly with so-called low-temperature heating systems. Water loop surface heating systems had been thoroughly tested. In contrast, thermal performance of wall panels with heat pipes have not been fully recognized, yet. The determination of the thermal power as well as the control of panels thermal performance cannot be performed with the methods developed for water loop systems. In this paper, the novel heating panels with heat pipes were tested to analyze the possibility of controlling their performance by changing the
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Peng, Shuang. "Modeling and Theoretical Analysis of Zero-Flowrate-Switching Control Method for a Dynamic Load System to Reduce Switching Power Loss of Control Valves." Actuators 12, no. 5 (2023): 183. http://dx.doi.org/10.3390/act12050183.

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Valve switching is one of the most important power losses in digital hydraulics. In this paper, a dynamic Zero-Flowrate-Switching (ZFS) control method is developed for hydraulic/pneumatic systems. The proposed control strategy is to actively reduce the flowrate passing through the valve to zero before switching off the valve. To realize it, an accessory line, in which a RLC oscillator is applied to generate a sinusoidal flowrate, is allocated parallel to the main control line for flowrate regulation. The pressure, with high frequency and small amplitude wave outputs from a regular piston pump,
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Mao, Yucai, Yunxiang Wang, Lei Zhang, and Qiuju Guo. "A HUMIDITY CONTROL TECHNIQUE BASED ON NAFION MEMBRANE AND ITS APPLICATION ON THE EVALUATION OF HUMIDITY RESPONSE FOR RADON MONITOR." Radiation Protection Dosimetry 184, no. 3-4 (2019): 448–52. http://dx.doi.org/10.1093/rpd/ncz083.

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Abstract Electrostatic collection technique is widely used in various radon monitors. The mechanism of this kind of radon monitor is that the positive Po particles, produced by decay of radon, can be collected on the surface of detector in electric field. Collection efficiency, therefore, could be affected by air humidity. Calibration under different humidity conditions or test of humidity response is necessary consequently. In this study, a humidity control technique based on Nafion membrane tube (NMT) is developed. Under a consistent flowrate with a certain stable level of radon concentratio
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Dissertations / Theses on the topic "Flowrate control"

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Johnson, Christopher Alan. "Modeling of frictional gas flow in a piezoelectrically actuated high-pressure microvalve for flowrate control." Auburn, Ala., 2005. http://repo.lib.auburn.edu/Send%2012-16-07/JOHNSON_CHRISTOPHER_11.pdf.

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Tomashevskyi, Roman, Viacheslav Kulichenko, and Nikolay Mahonin. "System for Flow Rate Regulation with Pulse-Width Modulation." Thesis, Kyiv polytechnic institute, 2014. http://repository.kpi.kharkov.ua/handle/KhPI-Press/7880.

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In article describes the concept of the flow control system for ozone-oxygen mixture, using the principles of pulse-width modulation. The basic equation for calculation of the system measurement channel are given. Experimental studies of such air channel system and its performance characteristics are describes. The possibility of using flow control system ozone-oxygen mixture in medical ozone is shown.
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Ellakany, Farid. "Enhancing the Thermo-Economic Performance of a Direct Steam Generation Solar Tower Power Plant through the Implementation of Steam Flow Control Strategies for Flexible Operation." Thesis, KTH, Kraft- och värmeteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-150112.

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Above 90% of the current installed concentrating solar power plants are based on conventional steam-turbine cycles. The operation of steam turbines in these plants is distinctive when compared to traditional base-load power plants. The reason goes back to the intermittent nature of solar power which, in the absence of thermal energy storage or a back-up combustion boiler, forces plant operators to shut down the turbines during night time or at times of low solar radiation. Furthermore, such intermittency often leads to undesirable off-design turbine operating circumstances, either by load vari
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Shean, Barry John. "The design of an automated froth flotation optimising control system, based on the maximisation of air recovery through air flowrate variation." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/39852.

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Mineral froth flotation is one of the most broadly used separation methods in the mineral processing industry. Despite being introduced in the early 1900's, and numerous years of research and development, flotation is still not fully understood and remains relatively inefficient. Consequently, large economic gains stand to be made through optimisation of present processes. Although numerous years of research into the automation of froth flotation control have been conducted to increase process efficiency, options for advanced and/or optimising control systems remain limited. One proposed reaso
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(9175667), Yan-Shu Huang. "Real-Time Monitoring of Powder Mass Flowrates for MPC/PID Control of a Continuous Direct Compaction Tablet Manufacturing Process." Thesis, 2020.

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<div>To continue the shift from batch operations to continuous operations for a wider range of products, advances in real-time process management (RTPM) are necessary. The key requirements for effective RTPM are to have reliable real-time data of the critical process parameters (CPP) and critical quality attributes (CQA) of the materials being processed, and to have robust control strategies for the rejection of disturbances and setpoint tracking.</div><div><br></div><div>Real-time measurements are necessary for capturing process dynamics and implement feedback control approaches. The mass flo
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Book chapters on the topic "Flowrate control"

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Muhsun, Sadiq S., Sanaa A. Talab Al-Osmy, Shaymaa Abdul Muttaled Al-Hashimi, and Zainab T. Al-Sharify. "Theoretical, CFD Simulation and Experimental Study to Predict the Flowrate Across a Square Edge Broad Crested Weir Depending on the End Depth as a Control Section." In Proceedings of AICCE'19. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-32816-0_2.

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Damiani, Christian, S. Klein, D. Wuttig, and B. Nestler. "Measurement and Control of Ultra-Low Liquid Flowrates for Drug Delivery Application." In IFMBE Proceedings. Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-69367-3_57.

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Yu, Zhen, and Huai Li. "Identification of Flowrates and Pressures in HVAC Distribution Network Based on Collective Intelligence System." In Proceedings of the 11th International Conference on Modelling, Identification and Control (ICMIC2019). Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0474-7_115.

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Magee, Patrick, and Mark Tooley. "Intravenous Pumps and Syringe Drivers." In The Physics, Clinical Measurement and Equipment of Anaesthetic Practice for the FRCA. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199595150.003.0031.

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Many infusions are given by gravity assisted, drip sets that give a flowrate dependent on the height of the reservoir above the patient, the length of the tubing, the bore of the IV cannula, the density and viscosity of the fluid being delivered, and the patient’s venous pressure. However there is an increasing tendency to use programmable volumetric intravenous pumps and syringe drivers to deliver intravenous anaesthesia, fluids, patient controlled analgesia, epidural infusions and other drugs. Not only are they programmable, but they can also be adjusted to give desired flowrates or volumes.
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AI, HONG, JIE WANG, and ZHENG-XI LI. "APPLICATION AND INTELLIGENT CONJUNCTION OF DIFFERENT FUNCTION BLOCKS IN FLOWRATE CONTROL." In Wavelet Analysis and Active Media Technology. World Scientific Publishing Company, 2005. http://dx.doi.org/10.1142/9789812701695_0059.

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Eya, Candidus U., Malachy C. Madu, Hyginus Agomuo, Nwokocha Nathan, Joseph Okwu Ogwuche, and Obinna Fidelis Ezea. "Solar-Powered and IOT-Aided Irrigation System for Small Farm-Scale Operation." In Advances in Transdisciplinary Engineering. IOS Press, 2024. https://doi.org/10.3233/atde241306.

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This article presents a Solar-powered and IOT-aided irrigation system for small farm-scale operation. The solar panel ensures a reliable and cost-efficient power source especially in remotest villages where there is no evidence of grid utility power supply. The system employs soil moisture sensors and a Wi-Fi module connected to a microcontroller for the supervision and control of the water pumping process, creating a connected irrigation solution enabled by the Internet of Things (IoT). This system instantly sends sensor data to the Blynk mobile application, enabling farmers to access and mon
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Conference papers on the topic "Flowrate control"

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Dugstad, Arne, Liv Lunde, and Ketil Videm. "Parametric Study of CO2 Corrosion of Carbon Steel." In CORROSION 1994. NACE International, 1994. https://doi.org/10.5006/c1994-94014.

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Abstract Carbon dioxide corrosion of carbon steel has been studied as a function of CO2 partial pressure (0.05 to 2.1 MPa), temperature (20, 40 60 and 90 °C), pH (4 to 6) and flow velocity (0.1, 3.1, 8.5, and 13 m/s) under conditions where protective iron carbonate films do not form. The experiments were carried out under strict control of the water chemistry in a high pressure corrosion testing loop. The corrosion rate was generally high and increased with increasing CO2 partial pressure to an exponent of 0.7. Under conditions with significant flow, high, uniform, corrosion rates only were ob
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Ghanem, Fred, Purnima M. Kodate, Gerard M. Capellades, and Kirti M. Yenkie. "Optimal Design of Antibody Extraction Systems using Protein A Resin with Multicycling." In Foundations of Computer-Aided Process Design. PSE Press, 2024. http://dx.doi.org/10.69997/sct.170492.

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Antibody therapies are important in treating life-threatening ailments such as cancer and autoimmune diseases. Purity of the antibody is essential for successful applications and Protein A selective resin extraction is the standard step for antibody recovery. Unfortunately, such resins can cost up to 30% of the total cost of antibody production. Hence, the optimal design of this purification step becomes a critical factor in downstream processing to minimize the size of the column needed. An accurate predictive model, as a digital twin representing the purification process, is necessary where
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Dong, Zhe. "Distributed flowrate-pressure control of fluid flow networks." In 2016 IEEE 55th Conference on Decision and Control (CDC). IEEE, 2016. http://dx.doi.org/10.1109/cdc.2016.7798932.

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Chaves, Gabriela, Hamidreza Karami, Danielle Monteiro, and Virgilio José Martins Ferreira. "Development of a Virtual Flowmeter as an Enhanced Alternative for Field Production Monitoring." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206259-ms.

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Abstract Flowrate is a valuable information for the oil and gas industry. High accuracy on flowrate estimation enhances production operations to control and manage the production. Recognized as a cost-efficient solution, the VFM (virtual flowmeter) is a mathematical-based technology designed to estimate the flowrates using available field instrumentation. The VFM approach developed in this work combines black-box simulations with mixed-integer linear programming (MILP) problem to obtain the flowrates dismissing the tuning process. The methodology included a set of multiphase flow correlations,
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Dong, Zhe. "HTGR Power-Level Control Only by Regulating Helium Flowrate." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16218.

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Abstract Currently, most of the power-level control methods of nuclear reactors are given based upon the scheme of inducing reactivity directly via control rods. However, the reactivity can also be injected indirectly via the negative temperature feedback effect. Motivated by this, a cascaded power-level control of high temperature gas-cooled reactor (HTGR) is proposed by only regulating primary helium flowrate, which can be able to provide globally asymptotical closed-loop stability. This new HTGR power-level control is composed by a helium temperature controller and a neutron flux controller
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Liu, Xinjian, Weipeng Shu, and Mengxi Wang. "Modification of Filtered Air Intake Flowrate to Improve Control Room Habitability." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-81941.

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Control room habitability (CRH) shall be maintained to provide adequate protection for control room operators, such that they can remain in the control room envelope (CRE) safely for an extended period and thus control the nuclear facility during normal and accident conditions. A critical objective of CRH systems is to limit operator doses and/or exposure to toxic gases. The CRH systems does this by the combination of the intake of filtered air, isolation of outside air, recirculation systems and etc. Among the parameters determining radioactivity in a control room (in proportion to radiation
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Xu, Mingxiu, Peng Zhang, Zengqiang Wang, et al. "Research on the measurement methods of iodine flowrate." In 2012 IEEE International Conference on Cyber Technology in Automation, Control, and Intelligent Systems (CYBER). IEEE, 2012. http://dx.doi.org/10.1109/cyber.2012.6320032.

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Adib, Ali Asghari, and David J. Hoelzle. "Hybrid Control of Flowrate in Microextrusion-Based Direct-Write Additive Manufacturing." In 2021 American Control Conference (ACC). IEEE, 2021. http://dx.doi.org/10.23919/acc50511.2021.9483215.

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Fuchao, Sun, Pei Xiaohan, Liu Longda, Lin Fanfu, and Jing Weina. "Correction model research on oil well downhole flowrate test based on venturi." In 2014 33rd Chinese Control Conference (CCC). IEEE, 2014. http://dx.doi.org/10.1109/chicc.2014.6896094.

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Prakhova, M. Yu, A. N. Krasnov, and E. A. Khoroshavina. "Automatic Gas Well Flowrate Control System for Urengoy Gas-Condensate Field." In 2019 International Russian Automation Conference. IEEE, 2019. http://dx.doi.org/10.1109/rusautocon.2019.8867779.

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