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Journal articles on the topic 'Flow control system'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

YAMAMOTO, Hideaki, Noriyuki NAKANO, Masahiro WATANABE, and Kensuke HARA. "2D21 Active Feedback Control of a Leakage-Flow-Induced Vibration of Translational 1DOF System by Flow Control." Proceedings of the Symposium on the Motion and Vibration Control 2010 (2010): _2D21–1_—_2D21–16_. http://dx.doi.org/10.1299/jsmemovic.2010._2d21-1_.

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2

Bong, Ki Wan, Stephen C. Chapin, Daniel C. Pregibon, David Baah, Tamara M. Floyd-Smith, and Patrick S. Doyle. "Compressed-air flow control system." Lab Chip 11, no. 4 (2011): 743–47. http://dx.doi.org/10.1039/c0lc00303d.

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3

Choi, Jeongju. "Flow control system design without flow meter sensor." Sensors and Actuators A: Physical 185 (October 2012): 127–31. http://dx.doi.org/10.1016/j.sna.2012.07.010.

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4

Khalil, Umair, Muhammad Yousaf Ali Khan, Umer Amir Khan, and Shahid Atiq. "Power Flow Control by Unified Power Flow Controller." April 2020 39, no. 2 (April 1, 2020): 257–66. http://dx.doi.org/10.22581/muet1982.2002.04.

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The demand of energy usage is increasing rapidly and to meet the energy requirements, best possible transmission systems should be adopted to avoid energy losses in our transmission systems. In Pakistan’s WAPDA (Water & Power Development Authority) system, the rapid increase in load and less generation capacity has increased load shedding thought the country. The government has planned to increase the generation capacity but the supply companies are facing line load-ability, environmental constraints, power limitations problems etc. Most of the supply companies prefer to extend the existing electrical networks instead of building new network to reduce financial burdens. In this paper the implementation of the FACTS (Flexible AC Transmission Systems) Devices in an electrical network is described. The FACTS devices enhance power transfer capacity of the line without adding new transmission line. These devices also protect the system from overloading in case of any contingency in the electrical network. The control of power flow, reactive power compensation and voltage control are the main capabilities of FACTS devices. This paper describes the impacts of FACTS devices on improving the voltage stability and power handling capability of a transmission line. The proposed methods for the controllable flow of active and reactive power in a transmission line are also elaborated. A simple electrical system is examined to explain the improvement in the constraints of power system using FACTS devices.

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Bybee, Karen. "An Integrated Electric Flow-Control System." Journal of Petroleum Technology 53, no. 10 (October 1, 2001): 52. http://dx.doi.org/10.2118/1001-0052-jpt.

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6

Randall, E. W., M. Kojima, C. T. O'Connor, and K. Herzog. "A capillary gas flow control system." Journal of Physics E: Scientific Instruments 21, no. 5 (May 1988): 505–7. http://dx.doi.org/10.1088/0022-3735/21/5/019.

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7

Khan, M. Y. A., U. Khalil, H. Khan, A. Uddin, and S. Ahmed. "Power Flow Control by Unified Power Flow Controller." Engineering, Technology & Applied Science Research 9, no. 2 (April 10, 2019): 3900–3904. http://dx.doi.org/10.48084/etasr.2587.

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The demand for electricity is increasing day by day and we have to produce more electrical energy to meet the load demands. Most of the experts prefer to extend the existing electrical networks over building the new network with greater costs. In this paper, the implementation of the flexible AC transmission systems (FACTS) devices in a simple electrical network is described. FACTS devices enhance power transfer capacity of the line without laying out new transmission line. These devices also protect the system from overloading in case of any contingency in the electrical network. Moreover, this paper describes the impacts of FACTS devices on improving the voltage stability and power handling capability of a transmission line. The proposed methods for the controllable flow of active and reactive power in a transmission line are also elaborated. A simple electrical system is examined to explain the improvement in the constraints of power system using FACTS devices.

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8

Rajagopal, S., V. G. Kulkarni, and S. Stidham. "Optimal flow control of a stochastic fluid-flow system." IEEE Journal on Selected Areas in Communications 13, no. 7 (1995): 1219–28. http://dx.doi.org/10.1109/49.414641.

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9

Wlezien, R. "Micro adaptive flow control." Aeronautical Journal 104, no. 1040 (October 2000): 453–58. http://dx.doi.org/10.1017/s0001924000091946.

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Abstract The Defense Advanced Research Projects Agency (DARPA) Micro Adaptive Flow Control programme is described using a series of illustrative examples. Adaptive flow control is defined to be the active modification of aerodynamic flows using small, time-dependent actuators in judiciously chosen locations. A diverse set of large-scale applications is described, in which micro adaptive flow control has a substantial overall system benefit.

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Äijälä, G., and D. Lumley. "Integrated soft sensor model for flow control." Water Science and Technology 53, no. 4-5 (February 1, 2006): 473–82. http://dx.doi.org/10.2166/wst.2006.152.

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Tighter discharge permits often require wastewater treatment plants to maximize utilization of available facilities in order to cost-effectively reach these goals. Important aspects are minimizing internal disturbances and using available information in a smart way to improve plant performance. In this study, flow control throughout a large highly automated wastewater treatment plant (WWTP) was implemented in order to reduce internal disturbances and to provide a firm foundation for more advanced process control. A modular flow control system was constructed based on existing instrumentation and soft sensor flow models. Modules were constructed for every unit process in water treatment and integrated into a plant-wide model. The flow control system is used to automatically control recirculation flows and bypass flows at the plant. The system was also successful in making accurate flow estimations at points in the plant where it is not possible to have conventional flow meter instrumentation. The system provides fault detection for physical flow measuring devices. The module construction allows easy adaptation for new unit processes added to the treatment plant.

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11

Ben Yehuda, Raz, Michael Kiperberg, and Nezer Jacob Zaidenberg. "Nanovised Control Flow Attestation." Applied Sciences 12, no. 5 (March 4, 2022): 2669. http://dx.doi.org/10.3390/app12052669.

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This paper presents an improvement of control flow attestation (C-FLAT) for Linux. C-FLAT is a control attestation system for embedded devices. It was implemented as a software executing in ARM’s TrustZone on bare-metal devices. We extend the design and implementation of C-FLAT through the use of a type 2 Nanovisor in the Linux operating system. We call our improved system “C-FLAT Linux”. Compared to the original C-FLAT, C-FLAT Linux reduces processing overheads and is able to detect the SlowLoris attack. We describe the architecture of C-FLAT Linux and provide extensive measurements of its performance in benchmarks and real-world scenarios. In addition, we demonstrate the detection of the SlowLoris attack on the Apache web server.

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12

Chen, Wei Hua, and Yan Wei Chen. "Power System Control Considering Line Flow Risk." Applied Mechanics and Materials 687-691 (November 2014): 3203–6. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.3203.

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Line flow is one of the key factors which dominate the power system security. To deal with this problem, this paper proposed a method of power system assessment and control based on power system Line flow risk. Probabilistic power flow (PPF) is used to analyze the random of system statuses. The severity function is used to describe the impact of the transmission line load. Line flow risk is defined as the result of the probability multiplying the severity of Line flow. It is an indicator of power system security. This reduces the system line flow risk and increases the system security.

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13

Li, Yudong, Yuqing Zhang, Zhangbing Zhou, and LinLin Shen. "Intelligent flow control algorithm for microservice system." Cognitive Computation and Systems 3, no. 3 (April 16, 2021): 276–85. http://dx.doi.org/10.1049/ccs2.12013.

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14

Riyanto, Didik, Puja Oktavia, and Jefriyanto Jefriyanto. "Internal Control System Analysis of Cash Flow." Jurnal Akuntansi, Manajemen, Bisnis dan Teknologi (AMBITEK) 2, no. 1 (February 1, 2022): 80–100. http://dx.doi.org/10.56870/ambitek.v2i1.35.

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This study aims to determine the extent to which the internal control system for cash receipts and disbursements is carried out by the Al-Hafidz DAPM UPK in carrying out its activities in order to achieve its goals. The method used in this research is qualitative research, with flowchart data analysis techniques, namely by pictorial analysis techniques used to explain the procedures that occur briefly and clearly, and descriptively, namely by first collecting data, classifying and interpreting data so that it can provide a clear picture of the problem under study. In collecting data using observation techniques, interviews, questionnaires and documentation, where the data taken is primary data in the form of evidence of records or historical reports that have been arranged in published and unpublished archives. The results of this study indicate that the internal control system for cash receipts and disbursements at UPK DAPM Al-Hafidz has been running well, but is not fully in accordance with the five components of internal control according to COSO theory. Four components are appropriate, namely the control environment, risk assessment, information and communication, and monitoring, while one component, namely control activities, is not appropriate.

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Fan, Zhao Long, Jian Hui Zhao, Fan Li, and Sun Rong. "Design of Bulk Solid Flow Control System." Advanced Materials Research 898 (February 2014): 568–73. http://dx.doi.org/10.4028/www.scientific.net/amr.898.568.

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This paper introduced the hardware module, software process, and control mode and communication protocol of bulk solid flow control system based on the C8051F020. It selected the C8051F020 of transplanted uCos-II embedded operating system as the core, used the module software design idea, and realized the cooperation of collection, PID control, communication and other tasks. The industry site experiment showed that the system had good adaptability, stability and control effect, the control accuracy reached to ±1%FS, and the measuring accuracy reached to ±5.

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Fütterer, C., N. Minc, V. Bormuth, J. H. Codarbox, P. Laval, J. Rossier, and J. L. Viovy. "Injection and flow control system for microchannels." Lab Chip 4, no. 4 (2004): 351–56. http://dx.doi.org/10.1039/b316729a.

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17

Thomsen, J. "Going with the flow [waterworks control system]." Engineering & Technology 5, no. 3 (February 20, 2010): 41. http://dx.doi.org/10.1049/et.2010.0309.

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18

YOSHIDA, Hiro, Takehiko SEGAWA, Hiroyuki ABE, Yoshihiro KIKUJIMA, and Akira NISHIZAWA. "An Attempt of Active Flow Control System." Proceedings of the Fluids engineering conference 2004 (2004): 5. http://dx.doi.org/10.1299/jsmefed.2004.5.

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19

Gong, D. C. "An automated flow line control system design." Computer Integrated Manufacturing Systems 11, no. 3 (July 1998): 207–15. http://dx.doi.org/10.1016/s0951-5240(98)00021-4.

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20

Yang, Jin Ming. "Fuzzy Control for Variable Cooling Water Flow System." Advanced Materials Research 461 (February 2012): 105–8. http://dx.doi.org/10.4028/www.scientific.net/amr.461.105.

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The variable flow cooling water system can achieve energy saving benefits just like variable primary flow chilled water system for central air conditioning system. How to design the control system with appropriate control algorithms and control strategies is particularly important. We can clarify the basic control principle of variable cooling water flow technology based on the analysis on DOF (degree of freedom) of cooling water systems, it is important for control system design. The article pointed out explicitly that the realization of variable flow technology for cooling water system must construct two control loops, one for cooling water supply temperature the other for return temperature, further more discussed control strategies for two control loops. In the end the article illustrated the synchronous frequency conversion technology for multiple cooling water pumps system to avoid overload when part of pumps put in operation

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21

ARAKAWA, Akio, Koichi SEKIMIZU, and Susumu SUMIDA. "Fuzzy Logic Control Application for BWR Recirculation Flow Control System." Journal of Nuclear Science and Technology 25, no. 3 (March 1988): 263–73. http://dx.doi.org/10.1080/18811248.1988.9733586.

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22

Benyamina, Maamar, Mohamed Bouhamida, Tayeb Allaoui, Rachid Taleb, and Mouloud Denai. "Robust control of a UPFC system with H~ control technique." Indonesian Journal of Electrical Engineering and Computer Science 18, no. 1 (April 1, 2020): 533. http://dx.doi.org/10.11591/ijeecs.v18.i1.pp533-543.

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<p>FACTS (Flexible AC Transmission Systems) technology has now been accepted as a potential solution to the stability problem and load flow. The Unified Power Flow Controller (UPFC) is considered to be the most powerful and versatile among all FACTS devices. This paper presents the control of a UPFC system using Hinf robust control technique. A simulation study using Matlab/Simulink is presented to the performance of this control strategy and the robustness with respect to variations of the system parameters such as the inductance of the transmission line.</p>

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23

Zhang, Lijie, Wenbo Fu, Xiaoming Yuan, and Zhaoliang Meng. "Research on Optimal Control of Excavator Negative Control Swing System." Processes 8, no. 9 (September 4, 2020): 1096. http://dx.doi.org/10.3390/pr8091096.

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In order to improve the energy efficiency and dynamic of negative control swing systems of excavators, this paper proposes a technical scheme of adding two PRVs (pressure reducing valves) to main valve pilot control circuit, which can adjust main value opening arbitrarily according to the working condition. A pump-value compound control strategy was formulated to regulate the system power flow. During swing motor acceleration, main pump and the two PRVs are controlled to match system supply flow with motor demand flow, thereby reducing motor overflow and shortening system response time. During swing motor braking, the channel from motor to tank is opened to release hydraulic brake pressure by controlling PRVs before swing speed reduces to zero, which prevents the motor from reversing and oscillating. A simulation model of 37-ton excavator was established, and the control strategy was simulated. The original and optimized performance of the swing system were compared and analyzed, and results show that the application of new scheme with the compound control strategy can reduce overflow and increase braking stability of the swing system. In addition, system response and speed control performance are also improved when excavator performs a single-swing action.

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24

KRISHNAN, SUREN, RAJAN THANGAVELOO, SHAPI-EE BIN ABD RAHMAN, and SIVA RAJA SINDIRAMUTTY. "Smart Ambulance Traffic Control System." Trends in Undergraduate Research 4, no. 1 (June 29, 2021): c28–34. http://dx.doi.org/10.33736/tur.2831.2021.

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The traffic lights control system is broadly implemented to track and control the flow of vehicles through the intersection of multiple roads. Nevertheless, the synchronization of traffic light system at adjacent junctions is an intricate issue given the different parameters involved. Existing traffic light control systems do not control many flows approaching the same junctions. This results in traffic jams and congestion at urban areas or major cities with high volume traffic consisting of various types of vehicles. This includes emergency ambulances travelling on the same traffic junction during peak hour traffic. Thus, an enhanced traffic light control system is imperative to provide a smooth and free flow for an ambulance on the way to its destination. The Smart Ambulance Traffic Control System proposed in this paper is an integrated system of traffic light control for emergency ambulance service. The traffic lights can be controlled in a timely and efficient manner every time an emergency ambulance is approaching. The Radio-Frequency Identification (RFID) is used as an instrument to communicate with traffic lights during traffic congestion. The emergency ambulance driver needs to activate the RFID tag to allow the detection of RFID readers to control the traffic light operation at the upcoming traffic light junctions. The traffic lights in the path of the ambulance are forced to be green to allow the emergency ambulance to pass through the junction with top priority. Immediately after the ambulance has passed the junction, the control system will reset and return to normal operations.

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Bagutdinov, R. A., and D. V. Bezhuashvili. "Developing a unified centralized transport flow control system." Transport Technician: Education and Practice 2, no. 1 (March 27, 2021): 71–77. http://dx.doi.org/10.46684/2687-1033.2021.1.71-77.

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Currently, there is an increase in information for data mining in transport systems, the main reason is the increase in the number of heterogeneous sources. The relevance of the topic lies in the need to collect, process, aggregate, and model large volumes of unstructured information that cannot be effectively processed by traditional methods. With the increasing flow of vehicles, its diversity, there is a need to optimize the processes of transportation and logistics, increase the system safety of road traffic. The creation of an information knowledge base will help to solve a number of important problems, including: the efficiency of road use, reduction of toxic emissions, control and unloading of traffic flows, reduction in the number of accidents, and prompt notification of services.The idea of developing a unified centralized traffic control system is described. To collect, store and process heterogeneous information, it is proposed to use a cloud infrastructure with split computation. For the purpose of high-quality processing and aggregation of heterogeneous information, it is recommended to investigate hidden dependencies in the data, build and analyze various aggregation options and interpret them in relation to specific tasks.The system should connect all participants in ground traffic, collect dissimilar materials that can be obtained from their devices and a variety of sensors, and also automate the management and decision-making in transport systems. Unstructured information must be correctly interpreted, categorized, and consistently labeled to identify implicit relationships between data.The scientific novelty of the research consists in the formation of the functions of the system being developed, the description of the main aspects, requirements, interfaces, models and methods for aggregating heterogeneous data.The results of the work can be used not only for analyzing big data in the field of transport, but also in other directions when solving problems of processing heterogeneous information.

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Stalewski, Wienczyslaw, and Andrzej Krzysiak. "Flow-separation-control system operating in feedback closed loop." Aircraft Engineering and Aerospace Technology 91, no. 3 (March 4, 2019): 498–508. http://dx.doi.org/10.1108/aeat-12-2017-0270.

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Purpose The purpose of this study is to develop the concept of self-adapting system which would be able to control a flow on the wing-high-lift system and protect the flow against strong separation. Design/methodology/approach The self-adapting system has been developed based on computational approach. The computational studies have been conducted using the URANS solver. The experimental investigations have been conducted to verify the computational results. Findings The developed solution is controlled by closed-loop-control (CLC) system. As flow actuators, the main-wing trailing-edge nozzles are proposed. Based on signals received from the pressure sensors located at the flap trailing edge, the CLC algorithm changes the amount of air blown from the nozzles. The results of computational simulations confirmed good effectiveness and reliability of the developed system. These results have been partially confirmed by experimental investigations. Research limitations/implications The presented research on an improvement of the effectiveness of high-lift systems of modern aircraft was conducted on the relatively lower level of the technology readiness. However, despite this limitation, the results of presented studies can provide a basis for developing innovative self-adaptive aerodynamic systems that potentially may be implemented in future aircrafts. Practical implications The studies on autonomous flow-separation control systems, operating in a closed feedback loop, are a great hope for significant advances in modern aeronautical engineering, also in the UAV area. The results of the presented studies can provide a basis for developing innovative self-adaptive aerodynamic systems at a higher level of technological readiness. Originality/value The presented approach is especially original and valuable in relation to the innovative concept of high-lift system supported by air-jets blown form the main-wing-trailing-edge nozzles; the effective and reliable flow sensors are the pressure sensors located at the flap trailing edge, and the effective and robust algorithm controlling the self-adapting aerodynamic system – original especially in respect to a strategy of deactivation of flow actuators.

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Xu, J. L., Shi Ming Ji, and Z. P. Fang. "Autonomous Control of Abrasive Flow Precision Machining." Advanced Materials Research 215 (March 2011): 384–88. http://dx.doi.org/10.4028/www.scientific.net/amr.215.384.

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Autonomous nodes distribution, including their relations, real time quality and network communication in abrasive flow precision machining (AFPM) was studied. Autonomous nodes are arranged according to their function. Control program of motor speed is copied into liquid level nodes, pressure nodes, temperature nodes, flux nodes and input/output nodes. If nodes failure has happened, competition algorithm is enabled automatically to select a new node to run important program. Reliability of autonomous control system can be calculated utilizing the formula derived from probability theory. ARM 9 embedded systems with 32 bit CPU and real time embedded operating system are adopted to realize real time quality and reliability of nodes which run independently. CAN field bus and message type flag are used in network communication structure to ensure the real time quality and reliability of nodes connection. Results reveal that using autonomous decentralized control in AFPM possesses not only the characteristic of real time quality, but also the online fault tolerance, which can ensure that system runs continuously even if some nodes break down. The method can avoid system destruction and improve whole system reliability.

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AL-Rawi, Mohammed A., and Mohamed O. Mostafa. "Power Flow Control using Phase Shift Transformers." Tikrit Journal of Engineering Sciences 17, no. 1 (March 31, 2010): 10–15. http://dx.doi.org/10.25130/tjes.17.1.02.

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The present paper examines and tests an alternative method to control and redirect electric power flow through certain paths (transmission lines). The control and redirecting of power flow is achieved through the use of phase shift transformers PSTs. An algorithm is presented which searches for a proper phase shift angle introduced by a PST at any given location. The proposed method is based on modelling the PST and the power system employing Newton-Raphson load flow approach. Finally, the installation of series of PSTs on the interconnected power systems aims at mitigating uncontrolled parallel flows and unbalanced sharing of power among transmission lines. The obtained results showed the effectiveness of the proposed method in sharing and controlling the electrical power flow among different interties of the 5-bus network on which the study applied.

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Jolly, M. R., and D. L. Margolis. "Regenerative Systems for Vibration Control." Journal of Vibration and Acoustics 119, no. 2 (April 1, 1997): 208–15. http://dx.doi.org/10.1115/1.2889705.

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The potential for energy regeneration in vibration control systems is investigated. Such control systems hold the possibility of self-sustainability by alternately extracting and releasing energy originating from the vibrating system in a controlled non-passive manner. To be self-sustaining, more energy must on average flow into the control system than flows out. Generally speaking, the performance of such a system will approach that of an active system while theoretically requiring no externally supplied power. As research progresses in this area, an increasing number of viable applications for regenerative vibration control systems are being uncovered. This paper examines two broad applications: base-excited suspensions and periodically excited compound mounts. Some experimental results of the former are presented to support our claims.

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Zhang, Jun, Zhen Hong Zhao, Hong Yun Ma, Dong Wang, and Li Guo. "Comparison of Groundwater Flow Systems under the Control of Different Aquifer Structures." Advanced Materials Research 610-613 (December 2012): 2688–92. http://dx.doi.org/10.4028/www.scientific.net/amr.610-613.2688.

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The structure of groundwater flow system is the core of study of groundwater system and the base of evaluation of groundwater resources. The control role of aquifer system to groundwater flow system is a key of study of the structure of groundwater flow system. The groundwater systems of the Ordos basin are analyzed as a case study. The control role of aquifer system to groundwater flow system is studied by comparison of groundwater flow systems under the control of different aquifer structures in 2-D profile numerical model. The research shows that the groundwater flow systems of the Ordos basin have the multilayer structure characteristics. The groundwater flow systems in the north of the Ordos basin show a cross-formational multi-hierarchy nested flow pattern in the northern aquifer systems without regional impermeable layer where the hydraulic connection between aquifer layers is closely. While, the hydraulic connection is discontinuous in the southern aquifer systems because there are regional impermeable layers in the aquifer systems. The groundwater flow systems in the south of the Ordos basin show a follow-formational flow pattern.

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Pranoto, Bayu, Chandra Gunawan, Hilmi Iman Firmansyah, Hangga Wicaksono, Andhika Angger Nugraha, and Muhammad Trifiananto. "Design And Control System of Automatic Control System of Coal Flow on Belt Conveyor Installation." Mekanika: Majalah Ilmiah Mekanika 20, no. 2 (September 30, 2021): 86. http://dx.doi.org/10.20961/mekanika.v20i2.51986.

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In a power plant unit whose main fuel is coal, there is generally use a belt conveyor installation. This conveyor belt serves to supply coal from the crusher unit to the combustion chamber of the power generation unit. In this study, we discuss a case where the installation of a belt conveyor which was initially only one line was then made a new branch that supplies coal to other power generating units. Equitable capacity distribution and continuity of coal distribution are the main focus of this study. Therefore, a design of automatic control system of coal flow divider on belt conveyor installation was designed. The working principle of this coal flow splitting system is to control the movement of the straight blade plough that directs the flow of coal to each unit at the certain time and continuously. Straight blade plough in the form of steel metal plate with a thickness of about 10 millimeters in which one end is connected to the end of the pneumatic cylinder. Automatic control system of coal flow divider in belt conveyor installation designed using CX-Programmer and CX-Designer applications. CX-Programmer serves to create automatic control logic concepts. While the CX-designer functions to create a Human Machine Interface (HMI), making it easier for operators to control the course of the coal supply process. The results of this study are in the form of control logic lines that can be applied to Programmable Logic Control (PLC) device and Human Machine Interface (HMI) equipment.

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Comas, J., E. Meabe, L. Sancho, G. Ferrero, J. Sipma, H. Monclús, and I. Rodriguez-Roda. "Knowledge-based system for automatic MBR control." Water Science and Technology 62, no. 12 (December 1, 2010): 2829–36. http://dx.doi.org/10.2166/wst.2010.693.

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MBR technology is currently challenging traditional wastewater treatment systems and is increasingly selected for WWTP upgrading. MBR systems typically are constructed on a smaller footprint, and provide superior treated water quality. However, the main drawback of MBR technology is that the permeability of membranes declines during filtration due to membrane fouling, which for a large part causes the high aeration requirements of an MBR to counteract this fouling phenomenon. Due to the complex and still unknown mechanisms of membrane fouling it is neither possible to describe clearly its development by means of a deterministic model, nor to control it with a purely mathematical law. Consequently the majority of MBR applications are controlled in an “open-loop” way i.e. with predefined and fixed air scour and filtration/relaxation or backwashing cycles, and scheduled inline or offline chemical cleaning as a preventive measure, without taking into account the real needs of membrane cleaning based on its filtration performance. However, existing theoretical and empirical knowledge about potential cause-effect relations between a number of factors (influent characteristics, biomass characteristics and operational conditions) and MBR operation can be used to build a knowledge-based decision support system (KB-DSS) for the automatic control of MBRs. This KB-DSS contains a knowledge-based control module, which, based on real time comparison of the current permeability trend with “reference trends”, aims at optimizing the operation and energy costs and decreasing fouling rates. In practice the automatic control system proposed regulates the set points of the key operational variables controlled in MBR systems (permeate flux, relaxation and backwash times, backwash flows and times, aeration flow rates, chemical cleaning frequency, waste sludge flow rate and recycle flow rates) and identifies its optimal value. This paper describes the concepts and the 3-level architecture of the knowledge-based DSS and details the knowledge-based control module. Preliminary results of the application of the control module to regulate the air flow rate of an MBR working with variable flux demonstrates the usefulness of this approach.

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Sun, Chun Yan, and Bao Yi Fang. "The PID Flow Control System Based on PLC." Applied Mechanics and Materials 740 (March 2015): 289–92. http://dx.doi.org/10.4028/www.scientific.net/amm.740.289.

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According to the time-varying and nonlinear characteristics of fluid, this paper puts forward a design scheme of real-time and accurate control of the liquid flow. The control system which taking the programmable logic controller (PLC) as the platform and using the PID control algorithm is composed with the touch screen, electromagnetic flow meter, temperature sensor, electric regulating valve system and so on. And the PID algorithm based on PLC design has carried on the analysis, simulation and optimization. The results show that PID algorithm is designed using this method with a strong and more precise control of the scheme. It is not only suitable for the flow control, changes in action after the equipment is also applicable to analog volume control temperature, liquid level, velocity, height etc.

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Li, Xianyu, Hua Wang, Zhiyuan Chen, and Weina Liu. "Flow Control and Optimization Technologies of Information System." Journal of Physics: Conference Series 1302 (August 2019): 022067. http://dx.doi.org/10.1088/1742-6596/1302/2/022067.

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35

Hack, S. N. "A nuclear data acquisition system flow control model." IEEE Transactions on Nuclear Science 35, no. 1 (1988): 942–50. http://dx.doi.org/10.1109/23.12864.

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Han, Yun-xiang, Xiao-qiong Huang, Xin-min Tang, and Song-chen Han. "A control policy for scheduled traffic flow system." Computers & Industrial Engineering 112 (October 2017): 238–45. http://dx.doi.org/10.1016/j.cie.2017.08.022.

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Huang, Shao-Ching, and John Kim. "Control and system identification of a separated flow." Physics of Fluids 20, no. 10 (October 2008): 101509. http://dx.doi.org/10.1063/1.3005860.

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Nikolov, Emil, Daniel Jolly, Hassane Abouaïssa, Violina Jordanova, and Bela Benova. "Fractional-Order Disturbance Absorbing Control System: Application for Traffic Flow Control." IFAC Proceedings Volumes 37, no. 19 (October 2004): 93–98. http://dx.doi.org/10.1016/s1474-6670(17)30665-1.

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39

Vitasovic, Zdenko, and John F. Andrews. "An Integrated Dynamic Model and Control System for Activated Sludge Wastewater Treatment Plants Part II — Control Systems." Water Quality Research Journal 24, no. 4 (November 1, 1989): 497–522. http://dx.doi.org/10.2166/wqrj.1989.031.

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Abstract Part I of this paper has presented an integrated dynamic model for the activated sludge process consisting of a mixture of standard engineering equations and theoretical mechanistic models. In this, Part II of the paper, the integrated model is used in computer simulations to explore process dynamics and integrated control strategies. The interactions of six individual controllers: DO, MCRT, the STOUR profile, settler flow, the compressor, and a pump station have been studied as well as interactions between plant components and design and operation. Among these interactions are those between fluctuations in the influent flow rate and the solids-liquid separator and STOUR in each portion of the biological reactor. The use of a variable volume biological reactor is proposed to damp the effects of flow rate fluctuations on the separator and thus improve effluent quality. Estimation of the STOUR profile and its use in process control is proposed for producing a sludge with more consistent settling characteristics. It is proposed that the use of separator flow control, air flow rate distribution, and step feed capabilities for process control be further explored by field studies for possible incorporation in new plant designs.

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Hervé, Aurelien, Denis Sipp, Peter J. Schmid, and Manuel Samuelides. "A physics-based approach to flow control using system identification." Journal of Fluid Mechanics 702 (June 7, 2012): 26–58. http://dx.doi.org/10.1017/jfm.2012.112.

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AbstractControl of amplifier flows poses a great challenge, since the influence of environmental noise sources and measurement contamination is a crucial component in the design of models and the subsequent performance of the controller. A model-based approach that makes a priori assumptions on the noise characteristics often yields unsatisfactory results when the true noise environment is different from the assumed one. An alternative approach is proposed that consists of a data-based system-identification technique for modelling the flow; it avoids the model-based shortcomings by directly incorporating noise influences into an auto-regressive (ARMAX) design. This technique is applied to flow over a backward-facing step, a typical example of a noise-amplifier flow. Physical insight into the specifics of the flow is used to interpret and tailor the various terms of the auto-regressive model. The designed compensator shows an impressive performance as well as a remarkable robustness to increased noise levels and to off-design operating conditions. Owing to its reliance on only time-sequences of observable data, the proposed technique should be attractive in the design of control strategies directly from experimental data and should result in effective compensators that maintain performance in a realistic disturbance environment.

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41

Ramadhani, Ari. "Water Temperature Control Using PID Control System Based on LabVIEW." Telekontran : Jurnal Ilmiah Telekomunikasi, Kendali dan Elektronika Terapan 4, no. 2 (July 23, 2016): 35–46. http://dx.doi.org/10.34010/telekontran.v4i2.1888.

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Abstract - Automatic system have grown widespread across all sector so do water heater. Traditionally, heating water is done by utilizing fire as heat source. As the growing of technology, the heating process could be done by manipulating electrical energy by convert it to heat. Electrical energy is flown to a metal rod that contact directly with the water which increase the water temperature. On some case, appropiate water temperature is needed. Altough, a thermometer is needed to read the actual temperature as a feedback value for the system and a system that can control the electricity current flow through the heater that the heat produced is linear to the current flow. With implementing microcontroller as a process node for generating PWM signal, this problem can be solved. Also, Labview is needed as an interface for monitoring and bursting an output which have been processed by Proportional, Integral, and Devivative (PID) controller to producing accurate and stable heat. Based on the results of testing, the system is able to provide a rapid response to any changes that occur, both changes in set-point and changes in water temperature (actual value). Another test is done by comparing the temperature value detected by the temperature sensor in this device with an external digital thermometer placed in the same place, and from some of the tests the temperature value detected by the temperature sensor in this device has a difference of ± 0.19 ℃ with a digital thermometer. Keyword : Water Heater, Thermometer, Microcontroller, LabView, PID.

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42

Gévay, Gábor E., Tilmann Rabl, Sebastian Breß, Loránd Madai-Tahy, Jorge-Arnulfo Quiané-Ruiz, and Volker Markl. "Imperative or Functional Control Flow Handling." ACM SIGMOD Record 51, no. 1 (May 31, 2022): 60–67. http://dx.doi.org/10.1145/3542700.3542715.

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Modern data analysis tasks often involve control flow statements, such as the iterations in PageRank and K-means. To achieve scalability, developers usually implement these tasks in distributed dataflow systems, such as Spark and Flink. Designers of such systems have to choose between providing imperative or functional control flow constructs to users. Imperative constructs are easier to use, but functional constructs are easier to compile to an efficient dataflow job. We propose Mitos, a system where control flow is both easy to use and efficient. Mitos relies on an intermediate representation based on the static single assignment form. This allows us to abstract away from specific control flow constructs and treat any imperative control flow uniformly both when building the dataflow job and when coordinating the distributed execution.

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Aswal, Pankaj, Suyash Kumar Singh, Apurv Thakur, and Kshitij Gaur. "A Novel Technique of Power Flow Control in Transmission Lines Using Interline Power Flow Control." Indonesian Journal of Electrical Engineering and Computer Science 3, no. 2 (August 1, 2016): 296. http://dx.doi.org/10.11591/ijeecs.v3.i2.pp296-304.

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The interline power flow control (IPFC) is the flexible AC transmission system controller (FACTS) came into accountability to control the flow of power in multiple line transmission system. The following paper demonstrates the IPFC modelling using Matlab Simulink. Power flow calculations has been made using Gauss-Seidel Method. Optimization of power in terms of real and reactive power flow is achieved by comparing the actual calculated term and the predicted value.

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YAU, CHIN-HORNG, ANIL K. BAJAJ, and OSITA D. I. NWOKAH. "ROBUST CONTROL OF A CHAOTIC VIBRATORY SYSTEM." International Journal of Bifurcation and Chaos 03, no. 04 (August 1993): 1075–81. http://dx.doi.org/10.1142/s0218127493000908.

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An active robust control system is designed, and is numerically verified, to suppress the undesirable chaotic vibration in a constrained flexible pipe conveying fluid, which exhibits regions of flutter and chaotic motions at sufficiently high flow velocity. The four-dimensional analytical model obtained from the continuous system by Galerkin's method is utilized for designing the control law. Some interesting nonlinear behaviors with the four-dimensional analytical model are discussed as well. Without sensing the flow velocity or gain-scheduling, a robust controller is developed for the system under large flow rate variations by using a newly developed Quantitative Feedback Design (QFD) method. This technique allows the controller to make the closed loop system response meet quantitatively specified performance requirements even though the system has large parameter variations. Numerical simulations validate the effectiveness of the QFD method which yields a remarkable result in stability and performance robustness with respect to flow velocity variations.

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Parmar, Dilip Lalchand, Deepak Kumar Singh, and Arjun Sharma. "Flow separation control in a two-airfoil system by trailing edge modification and active flow control." Progress in Computational Fluid Dynamics, An International Journal 1, no. 1 (2022): 1. http://dx.doi.org/10.1504/pcfd.2022.10052371.

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46

Wang, Yuqin, Haodong Zhang, Zhibo Han, and Xiaoqiang Ni. "Optimization Design of Centrifugal Pump Flow Control System Based on Adaptive Control." Processes 9, no. 9 (August 29, 2021): 1538. http://dx.doi.org/10.3390/pr9091538.

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In this paper, in order to improve the control characteristics of the centrifugal pump flow control system, a mathematical model of the centrifugal pump flow control system was established based on an analysis of the basic structures, such as the frequency converter, motor, and centrifugal pump. Based on the adaptive control theory, the recursive least squares algorithm with a forgetting factor was used to estimate the real-time parameters of the centrifugal pump control system, and the self-tuning PID control method was used to optimize the mathematical model of the centrifugal pump flow control system. The simulation results showed that the adjustment time of the optimized system was shortened by 16.58%, and the maximum overshoot was reduced by 83.90%, which improved the rapidity and stability of the transient response of the system. This showed that adaptive control had a significant effect on improving the robustness and anti-interference ability of the centrifugal pump control system. In order to further verify the accuracy of the self-tuning PID control method, a flow adaptive control system test platform was built. The test results showed that under the conditions of constant frequency and variable frequency, the actual flow rate of the centrifugal pump was always kept near the set flow rate, the error was small, and it had better real-time followability. The research results showed that adaptive control could revise the parameters in real-time according to changes to the centrifugal pump control system, which improved the stability and robustness of the system. Therefore, adaptive PID control could effectively improve the adaptability of centrifugal pumps to various complex working conditions and improve the working efficiency of centrifugal pumps.

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47

Caillaud, Se´bastien, Emmanuel de Langre, and Franck Baj. "Active Vibration Control for the Measurement of Fluidelastic Effects." Journal of Pressure Vessel Technology 125, no. 2 (May 1, 2003): 165–70. http://dx.doi.org/10.1115/1.1561451.

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A new method based on active vibration control is proposed to investigate fluidelastic coupling effects beyond fluidelastic instability. This active control method allows to extend the range of flow velocity explored for single input-single output control systems. The method is applied on a flexible tube inserted in a rigid bundle in water and air-water cross-flows. This structure becomes unstable for high flow velocities, fluidelastic forces then causing the damping of the fluid-structure system to fall towards zero. The active control method allows to carry out tests beyond the fluidelastic instability. The flow velocity range explored is doubled in two-phase flow.

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48

Tiţa, Irina, and Irina Mardare. "Research Regarding Pressure Compensated Flow Control Valves." Applied Mechanics and Materials 809-810 (November 2015): 992–97. http://dx.doi.org/10.4028/www.scientific.net/amm.809-810.992.

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In fluid power systems, flow control may be done either with variable displacement pump or using variable orifice. In this paper is considered the second method for flow control. In a hydraulic system, working pressure is frequently variable and therefore the use of the method does not provide constant flow rates in all operating conditions. In order to keep a constant flow, if this is important in a certain case, the flow control must be accomplished using a pressure compensated flow control valve. In this paper are analyzed possible structural diagrams, mathematical model, block diagram and functional diagram for this kind of equipment. The influence of the spring compression is analyzed also. The diagrams proposed in the paper will be used for the study of a hydraulic system designated for applications with strict flow control. It will represent an important research instrument for such cases.

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Li, Cong, and Xi Min Liu. "Nonlinear System Control Strategies." Advanced Materials Research 694-697 (May 2013): 2157–61. http://dx.doi.org/10.4028/www.scientific.net/amr.694-697.2157.

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A nonlinear model of a liquid level process is obtained on the analysis of its nonlinear characteristics. Then a practical nonlinear system control strategy of the liquid level process based on single chip computer is presented. By measuring the liquid level and flow rate, two key parameters of the liquid level process, the amplification coefficient and time constant under different load are calculated. Then the control signal is calculated according to the selected control method and the automatic control of the nonlinear system is realized. The test results are given and it shows that the nonlinear control strategy is better then the linear control strategy. The nonlinear control strategy can improve control quality considerably.

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Moon, Dae-Seong, Jae-Jin Seo, Yun-Seong Kim, and Dong-Jun Won. "Control Algorithm of Hybrid System for Feeder Flow Mode Operation in Microgrid." Transactions of The Korean Institute of Electrical Engineers 60, no. 1 (January 1, 2011): 1–7. http://dx.doi.org/10.5370/kiee.2011.60.1.001.

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