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Abstract

A need to control our environment is apparent from an early age. Where does it stem from?

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Authors and Affiliations

Małgorzata Godlewska
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Abstract

The paper describes a nonlinear controller design technique applied to a servo drive in the presence of hard state constraints. The approach presented is based on nonlinear state-space transformation and adaptive backstepping. It allows us to impose hard constraints on the state variables directly and to achieve asymptotic tracking of any reference trajectory inside the constraints, despite unknown plant parameters. Two control schemes (with and without integral action) are derived, investigated and then compared. Several examples demonstrate the main features of the design procedure and prove that it may be applied in case of motion control problems in electric drive automation.

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Authors and Affiliations

J. Kabziński
P. Mosiołek
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Abstract

The paper introduces Extended Identification-Based Predictive Control (EIPC), which is a novel control method developed for the problem of adaptive impact mitigation. The model-based approach utilizing the paradigm of Model Predictive Control is combined with sequential identification of selected system parameters and process disturbances. The elaborated method is implemented in the shock-absorber control system and tested under impact loading conditions. The presented numerical study proves the successful and efficient adaptation of the absorber to unknown excitation conditions as well as to unknown force and leakage disturbances appearing during the process. The EIPC is used for both semi-active and active control of the impact mitigation process, which are compared in detail. In addition, the influence of selected control parameters and disturbance identification on the efficiency of the impact absorption process is assessed. As a result, it can be concluded that an efficient and robust control method was developed and successfully applied to the problem of adaptive impact mitigation.
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Authors and Affiliations

Cezary Graczykowski
1
ORCID: ORCID
Rami Faraj
1
ORCID: ORCID

  1. Institute of Fundamental Technological Research PAS, Pawi´nskiego 5B, 02-106 Warszawa, Poland
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Abstract

Considering the importance of gear systems as one of the important vibration and noise sources in power transmission systems, an active control for suppressing gear vibration is presented in this paper. A gear bearing model is developed and used to design an active control gear-bearing system. Two possible configurations of control system are designed based on active bearing and active gear-shaft torsional coupling to control and reduce the disturbance affecting system components. The controller for computing the actuation force is designed by using the H-infinity control approach. Simulation results indicate that the desired controller can efficiently be used for vibration control of gear bearing systems.
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Bibliography

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[2] T.J. Sutton, S.J. Elliott, M.J. Brennan, K.H. Heron and D.A.C. Jessop. Active isolation of multiple structural waves on a helicopter gearbox support strut. Journal of Sound and Vibration, 205(1):81–101, 1997. doi: 10.1006/jsvi.1997.0972.
[3] G.T. Montague, A.F. Kaskak, A. Palazzolo, D. Manchala, and E. Thomas. Feed-forward control of gear mesh vibration using piezoelectric actuators. Shock and Vibration, 1(5):473–484 1994. doi: 10.3233/SAV-1994-1507.
[4] B. Rebbechi, C. Howard, and C. Hansen. Active control of gearbox vibration. Proceedings of the Active Control of Sound and Vibration Conference, pages 295–304, Fort Lauderdale, Florida, USA, 02-04 December, 1999.
[5] M.H. Chen and M.J. Brennan. Active control of gear vibration using specially configured sensors and actuators. Smart Materials and Structures, 9:342–350, 2000. doi: 10.1088/0964-1726/9/3/315.
[6] M. Li, T.C. Lim, and W.S. Shepard Jr. Modeling active vibration control of a geared rotor system. Smart Materials and Structures, 13:449–458, 2004. doi: 10.1088/0964-1726/13/3/001.
[7] Y.H. Guan, T.C. Lim, and W.S. Shepard Jr. Experimental study on active vibration control of a gearbox system. Journal of Sound and Vibration, 282(3-5):713–733, 2005. doi: 10.1016/j.jsv.2004.03.043.
[8] Y.H. Guan, M. Li, T.C. Lim, and W.S. Shepard Jr. Comparative analysis of actuator concept for active gear pair vibration control. Journal of Sound and Vibration, 269(1-2):273–294, 2004. doi: 10.1016/S0022-460X(03)00072-5.
[9] Y. Li, F. Zhang, Q. Ding, and L. Wang. Method and experiment study for active vibration control of gear meshing. Zhendong Gongcheng Xuebao/Journal of Vibration Engineering, 27(2):215–221, 2014.
[10] W. Gao, L. Wang, and Y. Liu. A modified adaptive filtering algorithm with online secondary path identification used for suppressing gearbox vibration. Journal of Mechanical Science and Technology, 30(11):4833–4843, 2016. doi: 10.1007/s12206-016-1002-z.
[11] W. Sun, F. Zhang, H. Li, H. Wang, and S. Luo. Co-simulation study on vibration control of multistage gear transmission system based on multiple control algorithms. Proceedings of the 2017 International Conference on Advanced Mechatronic Systems, pages 1–7, Xiamen, China, 2017. doi: 10.1109/ICAMechS.2017.8316474.
[12] W. Sun, F. Zhang, W. Zhu, H. Wang, S. Luo, and H. Li. A comparative study based on different control algoritms for suppressing multistage gear transmission system vibrations. Shock and Vibration, 2018:ID7984283, 2018. doi: 10.1155/2018/7984283.
[13] H. Wang, F. Zhang, H. Li, W. Sun, and S. Luo. Experimental analysis of an active vibration frequency control in gearbox. Shock and Vibration, 2018:ID7984283, 2018. doi: 10.1155/2018/1402697.
[14] C. Lauwerys, J. Swevers, and P. Sas. Robust linear control of an active suspension on a quarter car test-rig. Control Engineering Practice, 13(5):577–586, 2005. doi: 10.1016/ j.conengprac.2004.04.018.
[15] W. Sun, J. Li, Y. Zhao, and H. Gao. Vibration control for active seat suspension systems via dynamic output feedback with limited frequency characteristic. Mechatronics, 21(1):250–260, 2011. doi: 10.1016/j.mechatronics.2010.11.001.
[16] A. Farshidianfar, A. Saghafi, S.M. Kalami, and I. Saghafi. Active vibration isolation of machinery and sensitive equipment using H∞ control criterion and particle swarm optimization method. Meccanica, 47:437–453, 2012. doi: 10.1007/s11012-011-9451-z.
[17] R. Eberhart and J. Kennedy. A new optimizer using particle swarm theory. In Proceedings of the Sixth International Symposium on Micro Machine and Human Science, Nagoya, Japan, 4-6 October, 1995. doi: doi.org/10.1109/MHS.1995.494215">10.1109/MHS.1995.494215.
[18] J.F. Schutte and A.A. Groenwold. A study of global optimization using particle swarms. Journal of Global Optimization, 31:93–108, 2005. doi: 10.1007/s10898-003-6454-x.
[19] D. Sedighizadeh and E. Masehian. Particle swarm optimization methods, taxonomy and applications. International Journal of Computer Theory and Engineering, 1(5):1793-8201, 2009.
[20] A. Saghafi, A. Farshidianfar, and A.A. Akbari. Vibrations control of gear-bearing dynamic system. Modares Mechanical Engineering, 14(6):135-143, 2014. (in Persian).
[21] A. Farshidianfar and A. Saghafi. Global bifurcation and chaos analysis in nonlinear vibration of spur gear systems. Nonlinear Dynamics, 75:783–806, 2014. doi: 10.1007/s11071-013-1104-4.
[22] A. Saghafi and A. Farshidianfar. An analytical study of controlling chaotic dynamics in a spur gear system. Mechanism and Machine Theory, 96(1):179–191, 2016. doi: 10.1016/j.mechmachtheory.2015.10.002.
[23] G. Pinte, S. Devos, B. Stallaert, W. Symens, J. Swevers, and P. Sas. A piezo-based bearing for the active structural acoustic control of rotating machinery. Journal of Sound and Vibration, 329(9):1235–1253, 2010. doi: 10.1016/j.jsv.2009.10.036.
[24] S. Skogestad and I. Postlethwaite. Multivariable Feedback Control: Analysis and Design. 2nd ed., Wiley Interscience, New York, 2005.
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Authors and Affiliations

Amin Saghafi
1
ORCID: ORCID
Anooshirvan Farshidianfar
2

  1. Department of Mechanical Engineering, Birjand University of Technology, Birjand, Iran
  2. Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran
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Abstract

Passive noise reduction methods require thick and heavy barriers to be effective for low frequencies and those clasical ones are thus not suitable for reduction of low frequency noise generated by devices. Active noise-cancelling casings, where casing walls vibrations are actively controlled, are an interesting alternative that can provide much higher low-frequency noise reduction. Such systems, compared to classical ANC systems, can provide not only local, but also global noise reduction, which is highly expected for most applications. For effective control of casing vibrations a large number of actuators is required. Additionally, a high number of error sensors, usually microphones that measure noise emission from the device, is also required. All actuators have an effect on all error sensors, and the control system must take into account all paths, from each actuator to each error sensor. The Multiple Error FXLMS has very high computational requirements. To reduce it a Switched-Error FXLMS, where only one error signal is used at the given time, have been proposed. This, however, significantly reduces convergence rate. In this paper an algorithm that uses multiple errors at once, but not all, is proposed. The performance of various algorithm variants is compared using simulations with the models obtained from real active-noise cancelling casing.

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Authors and Affiliations

Krzysztof Mazur
Stanislaw Wrona
Anna Chraponska
Jaroslaw Rzepecki
Marek Pawelczyk
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Abstract

Operating cranes is challenging because payloads can experience large and dangerous oscillations. Anti-sway control of crane payload can be approached by the active methods, such as feedback control, or passive methods. The feedback control uses the feedback measurement of swing vibration to produce the command sent to a motor. The feedback control shows good effectiveness, but conflict with the actions of the human operator is a challenge of this method. The passive method uses the spring-damper to dissipate energy. The passive method does not cause conflict with the human operator but has limited performance. This paper presents the combination of two methods to overcome the disadvantages of each separate one. The passive method is used to improve the efficiency of the feedback method to avoid conflicts with the human operator. The effectiveness of the combination is simulated in a 2D crane model.
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Bibliography


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[17] Function Bay Inc., http://www.functionbay.co.kr/, last checked 27 May 2020.
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Authors and Affiliations

Trong Kien Nguyen
1

  1. Faculty of Civil Engineering, Vinh University, Vinh City, Nghe An, Vietnam
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Abstract

Methods of reliability engineering allow to anticipate an efficiency both geodetic network and single control points throughout the period of its operating. A reliability assessment of a predicted survey object behaviour produces data useful in optimisation of survey scope. timetable and accuracy. The essentials of reliability approach and procedures of finding of operational reliability characteristics have been presented in the paper. The presented characteristics include: the failure rate function ,i(/), the reliability function R(I) and the random object life F(1). Methods applied in reliability engineering viz. method of complete probability and method of evaluation of raw and parallel reliable structures have been adopted for survey purposes. Besides the standard ones original methods are also presented in the paper. Their concept lies on finding of stability functions and reliability characteristics indicated by means of statistical tests referring to density probability of predicted displacements. Although the presented theory is of general character the main application is focused on levelling networks.
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Authors and Affiliations

Bogdan Wolski
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Abstract

In order to control joints of manipulators with high precision, a position tracking control strategy combining fractional calculus with iterative learning control and sliding mode control is proposed for the control of a single joint of manipulators. Considering the coupling between joints of manipulators, a fractional-order iterative sliding mode cross-coupling control strategy is proposed and the theoretical proof of its progressive stability is given. The paper takes a two-joint manipulator as the research object to verify the control strategy of a single-joint manipulator. The results show that the control strategy proposed in this paper makes the two-joint mechanical arm chatter less and the tracking more accurate. The synchronous control of the manipulator is verified by a three-joint manipulator. The results show that the angular displacement adjustment times of the three-joint manipulator are 0.11 s, 0.31 s and 0.24 s, respectively. 3.25 s > 5 s, 3.15 s of a PD cross-coupling control strategy; 2.85 s, 2.32 s, 4.22 s of a PD iterative cross-coupling control strategy; 0.14 s, 0.33 s, 0.28 s of a fractional-order sliding mode cross-coupling control strategy. The root mean square error of the position error of the designed control strategy is 6.47 × 10-6 rad, 3.69 × 10-4 rad, 6.91 × 10-3 rad, respectively. The root mean square error of the synchronization error is 3.96 × 10-4 rad, 1.36 × 10-3 rad, 7.81 × 10-3 rad, superior to the other three control strategies. The results illustrate the effectiveness of the proposed control method.

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Authors and Affiliations

Xin Zhang
Wen-Ru Lu
Liang Zhang
Wen-Bo Xu
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Abstract

The paper presents a simulation analysis of four control systems of the raw coal feed to a jig: stabilization of the volumetric flow of the feed, stabilization of the feed tonnage, stabilization of the feed flow with the additional measurement of the feed bulk density or the additional measurement of ash content in the feed. Analysis has been performed for the first and second compartments of a jig. The aim of the feed control was to stabilize the mass of the bed in the zone where the material stratifies; the mass may change due to changes in the washability characteristics of the feed. Such control should result in stable conditions in which material loosens during subsequent media pulsation cycles; stabilizing conditions minimizes the dispersion of coal particles in the bed. The best results have been achieved for the system of feed control where the ash content was measured in the first compartment, and for feed tonnage control in the second compartment.

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Authors and Affiliations

Stanisław Cierpisz
Jarosław Joostberens
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Abstract

A problem of optimization for production and storge costs is studied. The problem consists in manufacture of n types of products, with some given restrictions, so that the total production and storage costs are minimal. The mathematical model is built using the framework of driftless control affine systems. Controllability is studied using Lie geometric methods and the optimal solution is obtained with Pontryagin Maximum Principle. It is proved that the economical system is not controllable, in the sense that we can only produce a certain quantity of products. Finally, some numerical examples are given with graphical representation.
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Bibliography

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Authors and Affiliations

Liviu Popescu
1
Ramona Dimitrov
1

  1. University of Craiova, Faculty of Economics and Business Administration, Department of Statistics and Economic Informatics, Al. I. Cuza st., No. 13, Craiova 200585, Romania
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Abstract

The paper is concerned with the presentation and analysis of the Dynamic Matrix Control (DMC) model predictive control algorithm with the representation of the process input trajectories by parametrised sums of Laguerre functions. First the formulation of the DMCL (DMC with Laguerre functions) algorithm is presented. The algorithm differs from the standard DMC one in the formulation of the decision variables of the optimization problem – coefficients of approximations by the Laguerre functions instead of control input values are these variables. Then the DMCL algorithm is applied to two multivariable benchmark problems to investigate properties of the algorithm and to provide a concise comparison with the standard DMC one. The problems with difficult dynamics are selected, which usually leads to longer prediction and control horizons. Benefits from using Laguerre functions were shown, especially evident for smaller sampling intervals.
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Bibliography

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Authors and Affiliations

Piotr Tatjewski
1

  1. Warsaw University of Technology, Nowowiejska15/19, 00-665 Warszawa, Poland
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Abstract

This paper presents the design of digital controller for longitudinal aircraft model based on the Dynamic Contraction Method. The control task is formulated as a tracking problem of velocity and flight path angle, where decoupled output transients are accomplished in spite of incomplete information about varying parameters of the system and external disturbances. The design of digital controller based on the pseudo-continuous approach is presented, where the digital controller is the result of continuous-time controller discretization. A resulting output feedback controller has a simple form of a combination of low-order linear dynamical systems and a matrix whose entries depend nonlinearly on certain known process variables. Simulation results for an aircraft model confirm theoretical expectations.

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Authors and Affiliations

Roman Czyba
Lukasz Stajer
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Abstract

Control of the technological processes of coal enrichment takes place in the presence of wide disturbances. Thus, one of the basic tasks of the coal enrichment process control systems is the stabilization of coal quality parameters at a preset level. An important problem is the choice of the controller which is robust for a variety of disturbances. The tuning of the controller parameters is no less important in the control process . Many methods of tuning the controller use the dynamic characteristics of the controlled process (dynamic model of the controlled object). Based on many studies it was found that the dynamics of many processes of coal enrichment can be represented by a dynamic model with properties of the inertial element with a time delay. The identification of object parameters (including the time constant) in industrial conditions is usually performed during normal operation (with the influence of disturbances) from this reason, determined parameters of the dynamic model may differ from the parameters of the actual process. The control system with controller parameters tuned on the basis of such a model may not satisfy the assumed control quality requirements.

In the paper, the analysis of the influence of changes in object model parameters in the course of the controlled value has been carried out. Research on the controller settings calculated according to parameters T and τ were carried out on objects with other parameter values. In the studies, a sensitivity analysis method was used. The sensitivity analysis for the three methods of tuning the PI controller for the coal enrichment processes control systems characterized by dynamic properties of the inertial element with time delay has been presented. Considerations are performed at various parameters of the object on the basis of the response of the control system for a constant value of set point. The assessment of considered tuning methods based on selected indices of control quality have been implemented.

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Authors and Affiliations

Roman Kaula
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Abstract

In this article, we extended the concept of controllability, traditionally used to control the final state of a system, to the exact control of its final speed. Inspired by Kalman’s theory, we have established some conditions to characterize the control that allows the system to reach a desired final speed exactly. When the assumptions ensuring speed-controllability are not met, we adopt a regulation strategy that involves determining the control law to make the system’s final speed approach as closely as possible to the predefined final speed, and this at a lower cost. The theoretical results obtained are illustrated through three examples.
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Authors and Affiliations

Mostafa Rachik
1
ORCID: ORCID
Issam Khaloufi
1
ORCID: ORCID
Youssef Benfatah
1
ORCID: ORCID
Hamza Boutayeb
1
ORCID: ORCID
Hassan Laarabi
1
ORCID: ORCID

  1. Laboratory of Analysis Modeling and Simulation, Department of Mathematics and Computer Science, Faculty of Sciences Ben M’Sik, Hassan II University Casablanca, BP 7955, Sidi Othman, Casablanca, Morocco
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Abstract

The article presents the reviewed and summarised research activities of Polish research groups on reference frames and reference networks in a period of 2019–2022. It contains the results on the implementation of latest resolutions on reference systems of the International Union of Geodesy and Geophysics and the International Astronomical Union focusing on changes in the consecutive issues of the Astronomical Almanac of the Institute of Geodesy and Cartography, Warsaw. It further presents the status of the implementation of the European Terrestrial Reference System 1989 (ETRS89) in Poland, monitoring the terrestrial reference frame, including research on global terrestrial reference frames, GNSS data analysis within the EUREF Permanent Network, research on GNSS receiver antenna phase centres, research on impact of non-tidal loading effects on position solutions, and on station velocities. Then the activities concerning the realization of ITRS and ETRS89 in Poland are discussed, including operational work of GNSS IGS/EPN stations as well as operational work of the laser ranging station of the International Laser Ranging Service, with special emphasis on the Polish active GNSS network for the realization of ETRS89 and maintenance of the vertical control network. Extensive research activities are observed in the field of implementation of the International Terrestrial Gravity Reference Frame in Poland, maintenance and modernization of gravity control network in Poland but also in Sweden, establishment of gravity control network in Ireland based on absolute gravity survey as well as maintenance of the national magnetic control network in Poland which is traditionally performed on a regular basis.
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Authors and Affiliations

Jan Kryński
1
ORCID: ORCID
Tomasz Liwosz
2
ORCID: ORCID

  1. Institute of Geodesy and Cartography, Warsaw, Poland
  2. Warsaw University of Technology, Warsaw, Poland
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Abstract

Self-control is a complex and multifaceted construct that can be regarded as an individual trait that follows its own developmental trajectory. In the presented study we used NAS-50 for the assessment of self-control in adolescents and young adults. Since the questionnaire has not been used before in underage participants we tested its reliability in adolescent and adult samples. We also investigated possible age and gender differences in self-control abilities as well as relations between NAS-50 and behavioral measures of cognitive control and impulsivity. Although the sample was quite small, the reliability of the questionnaire was similar to the results achieved by its authors. According to the predictions in the literature we did not find relations between NAS-50 and behavioral measures of cognitive control and impulsivity. We also did not observe significant age differences in the assessment of self-control abilities. The theoretical relevance of our results is discussed.

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Authors and Affiliations

Joanna Fryt
Tomasz Smoleń
Karolina Czernecka
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Abstract

In this article we focus on optimal control problems involving a nonlinear fractional control system of different orders with Caputo derivatives, associated to a Lagrange cost functional. Based on a lower closure theorem for orientor fields combined with Filippov’s approach, we derive an existence result for at least one optimal solution for such a problem.
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Authors and Affiliations

Rafał Kamocki
1

  1. Faculty of Mathematics and Computer Science, University of Lodz, Banacha 22, 90-238 Łódz, Poland
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Abstract

Digitaria insularis (sourgrass) is a monocotyledon weed of difficult control and high invasive behavior. Atrazine is widely applied in the Americas to control weeds in maize culture, but its efficiency against D. insularis is limited. The incorporation of atrazine into poly(epsilon-caprolactone) nanocapsules increased the herbicidal activity against susceptible weeds; however, the potential of this nanoformulation to control atrazine-tolerant weeds including D. insularis has not yet been tested. Here, we evaluated the post-emergent herbicidal activity of nanoatrazine against D. insularis plants during initial developmental stages. The study was carried out in a greenhouse, using pots filled with clay soil. Plants with two or four expanded leaves were treated with conventional or nanoencapsulated atrazine at 50 or 100% of the recommended dosage (1,000 or 2,000 g ∙ ha−1), followed by the evaluation of physiological, growth, and control parameters of the plants. Compared with conventional herbicide, both dosages of nanoatrazine induced greater and faster inhibition of D. insularis photosystem II activity at both developmental stages. Atrazine nanoencapsulation also improved the control of D. insularis plants, especially in the stage with two expanded leaves. In addition, nanoatrazine led to higher decreases of dry weight of fourleaved plants than atrazine. The use of the half-dosage of nanoatrazine was equally or more efficient in affecting most of the evaluated parameters than the conventional formulation at full dosage. Overall, these results suggest that the nanoencapsulation of atrazine potentiated its post-emergent herbicidal activity against D. insularis plants at initial developmental stages, favoring the control of this atrazine-tolerant weed.

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Authors and Affiliations

Bruno Teixeira Sousa
Anderson do Espírito Santo Pereira
Leonardo Fernandes Fraceto
Halley Caixeta de Oliveira
Giliardi Dalazen
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Abstract

Based on the respective characteristics of line-commutated converter high-voltage direct current (LCC-HVDC) and voltage-source converter high voltage direct cur- rent (VSC-HVDC), two additional emergency DC power support (EDCPS) controllers are designed, respectively. In addition a coordinated control strategy based on a hybrid multi-infeed HVDC system for EDCPS is proposed. Considering the difference in system recovery between LCC-HVDC and VSC-HVDC in EDCPS, according to the magnitude of the amount of potential power loss, the LCC-HVDC and VSC-HVDC priority issues of boosting power for EDCPS are discussed in detail. Finally, a hybrid three-infeed HVDC that consists of two parallel LCC-HVDCs and one VSC-HVDC that is built in PSCAD/EMTDC are simulated. The effectiveness of the proposed approach is verified based on this hybrid three-infeed HVDC system.

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Authors and Affiliations

Congshan Li
ORCID: ORCID
Yikai Li
ORCID: ORCID
Jian Guo
Ping He
ORCID: ORCID
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Abstract

The purpose of this paper is to show possibility and advantages of initial control plane reproduction for an adaptive fuzzy controller. Usually the fuzzy control is used when the object is not very well known. Yet the truth is, however, that some, at least general information about the object, is available. Usually, in such a case, optimization algorithms are used to tune the control structure. The purpose of this article is to show how to find a starting point that is closer to optimum than a statistically random point, and this way to obtain better results in a shorter time.

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Authors and Affiliations

Piotr Derugo
Mateusz Żychlewicz
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Abstract

The deviation from the ideal waveform causes disturbances and failure of end-user load equipment. Power traveling a long distance from the generation plant to the end-user leads to deterioration of its quality, and the intensive utilization of power leads to serious issues in the grid resulting in power quality problems. To make the system effective and able to meet modern requirements, flexible AC transmission system (FACTS) devices should be installed into the grid. The interline power flow controller (IPFC) is the latest FACTS device, which compensates for both active and reactive power among multi-line systems. The converters used in the IPFC are crucial as they can be adjusted to regulate the power flow among the lines. This paper proposes a cascaded IPFC with hysteresis and proportional resonant voltage controllers. Some main drawbacks of controllers like steady-state errors and reference tracking of converters can be easily achieved by the PR controller, which makes the system efficient and can be used for a wide range of grid applications. Hysteresis and PR controllers are explained in detail in the following sections. A comparative analysis is carried out among control algorithms to choose the suitable controller which maintains stability in the system.
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Authors and Affiliations

Sridhar Babu Gurijala
1
ORCID: ORCID
D. Ravi Kishore
1
ORCID: ORCID
Ramchandra Nittala
2
ORCID: ORCID
Rohith Reddy Godala
3
ORCID: ORCID

  1. Department of Electrical and Electronics Engineering, Koneru Lakshmaiah Education Foundation, Vaddeswaram, AP, India
  2. Department of Electrical and Electronics Engineering, St. Martin’s Engineering College, Dhulapally, near Kompally, Secunderabad, Telangana, India
  3. Faculty of Power and Electrical Engineering, Institute of Industrial Electronics and Electrical Engineering, Riga Technical University, Riga, Latvia
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Abstract

The model predictive current control (MPCC) of the permanent magnet synchronous motor (PMSM) is highly dependent on motor parameters, and a parameter mismatch will cause the system performance degradation. Therefore, a strategy based on an internal model control (IMC) observer is proposed to correct the mismatch parameters. Firstly, based on the MPCC strategy of the PMSM, according to the dynamic model of the PMSM in a rotating orthogonal coordinate system, d-axis and q-axis current IMC observers are designed, and the stability derivation is carried out. It is proved that the observer can estimate d-axis and q-axis disturbance components caused by a parameter mismatch without static error. Then, the estimated disturbance component is compensated for by the reference voltage prediction expression. Finally, the effectiveness of the proposed strategy is verified in two different conditions. The experimental results show that the proposed control strategy can effectively compensate for the parameter mismatch disturbance in MPCC for PMSM, improve the dynamic and static performance of the system, and improve the robustness of the system.
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Authors and Affiliations

Min'an Tang
1
Chenyu Wang
1
Yinhang Luo
1
ORCID: ORCID

  1. School of Automation and Electrical Engineering, Lanzhou Jiaotong University, China No. 88, Anning West Road, Anning District, Lanzhou City, Gansu Province, China
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Abstract

This paper presents a comparative study between the conventional PI (Proportional Integral) and backstepping controllers applied to the DFIG (Doubly Fed Induction Generator) used in WECS (Wind Energy Conversion System). These two different control strategies proposed in this work are developed to control the active and reactive power of the DFIG on the one hand, and to maintain the DC-link voltage constant for the inverting function on the other hand. This is ensured by generating control signals for two power electronic converters, RSC (Rotor Side Converter) and GSC (Grid Side Converter). In order to optimise the power production in the WT (Wind Turbine), an MPPT (Maximum Power Point Tracking) algorithm is applied along with each control technique. To simulate the effectiveness of the proposed controllers, MATLAB/Simulink Software is used, and the obtained results are analysed and discussed to compare PI and backstepping controllers in terms of robustness against wind speed variations and tracking performance in dynamic and steady states.
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Authors and Affiliations

Youssef Moumani
1
ORCID: ORCID
Abdeslam Jabal Laafou
1
ORCID: ORCID
Abdessalam Ait Madi
1
ORCID: ORCID

  1. Advanced Systems Engineering Laboratory, National School of Applied Sciences, Ibn Tofail University, Kenitra, Morocco
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Abstract

The time delay element present in the PI controller brings dead-time compensation capability and shows improved performance for dead-time processes. However, design of robust time delayed PI controller needs much responsiveness for uncertainty in dead-time processes. Hence in this paper, robustness of time delayed PI controller has been analyzed for First Order plus Dead-Time (FOPDT) process model. The process having dead-time greater than three times of time constant is very sensitive to dead-time variation. A first order filter is introduced to ensure robustness. Furthermore, integral time constant of time delayed PI controller is modified to attain better regulatory performance for the lag-dominant processes. The FOPDT process models are classified into dead-time/lag dominated on the basis of dead-time to time constant ratio. A unified tuning method is developed for processes with a number of dead-time to time constant ratio. Several simulation examples and experimental evaluation are exhibited to show the efficiency of the proposed unified tuning technique. The applicability to the process models other than FOPDT such as high-order, integrating, right half plane zero systems are also demonstrated via simulation examples.
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Authors and Affiliations

Arun R. Pathiran
1
R. Muniraj
2
ORCID: ORCID
M. Willjuice Iruthayarajan
3
ORCID: ORCID
S.R. Boselin Prabhu
4
T. Jarin
5
ORCID: ORCID

  1. Department of Electrical and Electronics Technology, Ethiopian Technical University, Addis Ababa, Ethiopia
  2. Department of Electrical and Electronics Engineering, P.S.R. Engineering College, Sivakasi, Virudhunagar District, Tamilnadu, India
  3. Department of Electrical and Electronics Engineering, National Engineering College, Kovilpatti, India
  4. Department of Electronics and Communication Engineering, Surya Engineering College, Mettukadai, India
  5. Department of Electrical and Electronics Engineering, Jyothi Engineering College, Thrissur, India

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