Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 19
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

This paper investigates the possibility of automatically linearizing nonlinear models. Constructing a linearised model for a nonlinear system is quite labor-intensive and practically unrealistic when the dimension is greater than 3. Therefore, it is important to automate the process of linearisation of the original nonlinear model. Based on the application of computer algebra, a constructive algorithm for the linearisation of a system of non-linear ordinary differential equations was developed. A software was developed on MatLab. The effectiveness of the proposed algorithm has been demonstrated on applied problems: an unmanned aerial vehicle dynamics model and a twolink robot model. The obtained linearized models were then used to test the stability of the original models. In order to account for possible inaccuracies in the measurements of the technical parameters of the model, an interval linearized model is adopted. For such a model, the procedure for constructing the corresponding interval characteristic polynomial and the corresponding Hurwitz matrix is automated. On the basis of the analysis of the properties of the main minors of the Hurwitz matrix, the stability of the studied system was analyzed.
Go to article

Authors and Affiliations

Aigerim Mazakova
3
Sholpan Jomartova
3
Waldemar Wójcik
2
Talgat Mazakov
1
Gulzat Ziyatbekova
1

  1. Institute of Information and Computational Technologies CS MES RK, Al-Farabi Kazakh National University, Kazakhstan
  2. Lublin Technical University, Poland
  3. Al-Farabi Kazakh NationalUniversity, Kazakhstan
Download PDF Download RIS Download Bibtex

Abstract

In recent years, a significant development of technologies related to the control and communication of mobile robots, including Unmanned Aerial Vehicles, has been noticeable. Developing these technologies requires having the necessary hardware and software to enable prototyping and simulation of control algorithms in laboratory conditions. The article presents the Laboratory of Intelligent Mobile Robots equipped with the latest solutions. The laboratory equipment consists of four quadcopter drones (QDrone) and two wheeled robots (QBot), equipped with rich sensor sets, a ground control station with Matlab-Simulink software, OptiTRACK object tracking system, and the necessary infrastructure for communication and security. The paper presents the results of measurements from sensors of robots monitoring various quantities during work. The measurements concerned, among others, the quantities of robots registered by IMU sensors of the tested robots (i.e., accelerometers, magnetometers, gyroscopes and others).

Go to article

Authors and Affiliations

Sebastian Dudzik
Piotr Szeląg
Janusz Baran
Download PDF Download RIS Download Bibtex

Abstract

Schemes are presented for calculating tuples of solutions of matrix polynomial equations using continued fractions. Despite the fact that the simplest matrix equations were solved in the second half of the 19th century, and the problem of multiplier decomposition was then deeply analysed, many tasks in this area have not yet been solved. Therefore, the construction of computer schemes for calculating the sequences of solutions is proposed in this work. The second-order matrix equations can be solved by a matrix chain function or iterative method. The results of the numerical experiment using the MatLab package for a given number of iterations are presented. A similar calculation is done for a symmetric square matrix equation of the 2nd order. Also, for the discrete (time) Riccati equation, as its analytical solution cannot be performed yet, we propose constructing its own special scheme of development of the solution in the matrix continued fraction. Next, matrix equations of the n-th order, matrix polynomial equations of the order of non-canonical form, and finally, the conditions for the termination of the iterative process in solving matrix equations by branched continued fractions and the criteria of convergence of matrix branching chain fractions to solutions are discussed.

Go to article

Authors and Affiliations

J. Dorożyński
M. Nedashkovskyy
Download PDF Download RIS Download Bibtex

Abstract

In the field of power and drive systems, electrical AC machines are mostly modeled using a set of explicit ordinary differential equations in a state space representation. It is shown, that by using other equation types for simulation, algebraic constraints arising from aggregating several machines to a more complex system can directly be considered. The effects of different model variants on numerical ODE/DAE solvers are investigated in the focus of this work in order perform efficient simulations of larger systems possessing electrical AC machines.

Go to article

Authors and Affiliations

Michael Popp
Patrick Laza
Wolfgang Mathis
Download PDF Download RIS Download Bibtex

Abstract

This paper presents a mathematical model of a power controller for a high-frequency induction heating system based on a modified half-bridge series resonant inverter. The output real power is precise over the heating coil, and this real power is processed as a feedback signal that contends a closed-loop topology with a proportional-integral-derivative controller. This technique enables both control of the closed-loop power and determination of the stability of the high-frequency inverter. Unlike the topologies of existing power controllers, the proposed topology enables direct control of the real power of the high-frequency inverter.

Go to article

Authors and Affiliations

Palash Pal
Debabrata Roy
Avik Datta
Pradip K. Sadhu
Atanu Banerjee
Download PDF Download RIS Download Bibtex

Abstract

The article proposes an adaptive algorithm that generates all object signals, including those for which measurements are not performed due to the difficulties associated with on-line measurements. The algorithm is modeled on the idea of the Kalman filter using its equation, however, the selection of gains is optimized in a different way, i.e. the constant values depend on the adopted ranges of adaptation errors. Moreover, the knowledge of the statistics of all noise signals is not imposed and there is no linearity constraint. This approach allowed to reduce the complexity of calculations. This algorithm can be used in real-time systems to generate signals of objects described by non-linear differential equations and it is universal, which allows it to be used for various objects. In the conducted research, on the example of a biochemically contaminated river, only easily measurable signals were used to generated the object signals, and in addition, in the case of absence some measurements, the functioning of the algorithm did not destabilize.
Go to article

Authors and Affiliations

Przemysław Hawro
ORCID: ORCID
Tadeusz Kwater
ORCID: ORCID
Jacek Bartman
ORCID: ORCID
Bogdan Kwiatkowski
ORCID: ORCID

Download PDF Download RIS Download Bibtex

Abstract

Mathematical package Matlab is a very convenient programming language, used for calculations in the field of linear algebra for scientists and engineers. Its main advantage for civil engineers is the simplicity of the language and the wide range of application in the field of linear statics. This mathematical platformwas used for programming of static calculations of multi-span, continuous, beam bridge structures. In the formulated theoretical approach, the internal forces were calculated using the method of forces. Knowing the influence matrix and load values in the unit states, the envelope of internal forces can be determined. The first step is entering the vector of loads and the second is calculating an envelope using special function. Obtaining the results from individual loads in a variety of operating conditions, it is possible to calculate the global envelope of internal forces and proceed with modifications of the model. The theoretical approach was computationally tested on the example of an alternative design concept of the MA-46 bridge along the A4 motorway. One of the biggest advantages of the discussed computational approach is the wide access to the results of intermediate calculations. Another benefits of working with mathematical packages are improving insight in the field of static calculations and getting used to working with code like in some programs for structural analysis (e.g. SOFiSTiK). The discussed computational approach is a good way to pre-design due to the little time required to compare several variants of solution, so it can be helpful in optimizing the structure.
Go to article

Bibliography

[1] P.I. Kattan, Matlab for Beginners: A Gentle Approach. Petra Books, 2008.
[2] W.Wunderlich,W.D. Pilkey, Mechanics of Structures. Variational and Computational Methods. CRC Press, 2002.
[3] A. Guerra, P.D. Kiousis, “Design optimization of reinforced concrete structures”, Computers and Concrete, 2006, vol. 3, no. 5, pp. 313-334.
[4] R.F. Kale, N.G. Gore, P.J. Salunke, “Applications of Matlab in optimization of bridge superstructures”, International Journal of Research in Engineering and Technology, 2014, vol. 3, no. 5, pp. 34-39.
[5] A. Martins, L. Simões, J. Negrão, “Optimum design of concrete cable-stayed bridges”, Engineering Optimization, 2016, vol. 48, no. 5, pp. 772-791, DOI: 10.1080/0305215X.2015.1057057.
[6] A. Martins, L. Simões, J. Negrão, “Optimization of cable forces on concrete cable-stayed bridges including geometrical nonlinearities”, Computers and Structures, 2015, vol. 155, pp. 18-27, DOI: 10.1016/j.compstruc.2015.02.032.
[7] B. Czaplewski, “Projekt mostu drogowego MA-46 w ciagu autostrady A4”. Opiekun: dr inz. Paweł Hawryszków, Politechnika Wrocławska, 2015 (in Polish).
[8] E.C. Hambly, Bridge Deck Behaviour. CRC Press, 1991.
[9] J. Hołowaty, “Numerical Approach for the Live Load Distribution in Road Bridges”, Computer Technology and Application, 2015, vol. 6, pp. 101-106, DOI: 10.17265/1934-7332/2015.02.007.
[10] R. Bareš, Ch.E. Massonnet, Analysis of Beam Grids and Orthotropic Plates by the Guyon–Massonnet-Bareš Method. Lockwood; SNTL, 1968.
[11] J. Biliszczuk, P. Hawryszków, M. Sułkowski, “Kładka Wezowisko w Jadwisinie koło Zegrza”, Inzynieria i Budownictwo, 2009, no. 1/2, pp. 46-48 (in Polish).
[12] J. Biliszczuk, P. Hawryszków, M. Sułkowski, “The design of Snake Footbridge in Jadwisin”, in Concrete structures in Poland 2000-2005. Polish Cement Association, 2006, pp. 12-13.
[13] J. Biliszczuk, P. Hawryszków, M.Wegrzyniak, A. Maury, M. Sułkowski, “Podwieszona kładka dla pieszych z drewna klejonego w Sromowcach Niznych”, Inzynieria i Budownictwo, 2008, no. 1/2, pp. 5-8 (in Polish).
[14] J. Biliszczuk, P. Hawryszków, “Foot and cycling bridge over the Dunajec River in Sromowce Nizne”, in Engineering structures (Inženýrské stavby V4). CKAIT, 2012, pp. 136-143.
[15] H. Zobel, T. Alkhafaji, Mosty drewniane. Warszawa: WKŁ, 2006 (in Polish).
Go to article

Authors and Affiliations

Paweł Hawryszków
1
Bronisław Czaplewski
1

  1. Wrocław University of Science and Technology, Faculty of Civil Engineering, ul. Wybrzeze Wyspianskiego 27, 50-370 Wrocław, Poland
Download PDF Download RIS Download Bibtex

Abstract

The paper contains selected results of research on the Domestic Power System (DPS) as an unmanned factory. Models of the DPS system of the MISO type, obtained as a result of identification for 14 inputs and 4 outputs were presented. Particular attention was given to the identification and the assessment of the DPS development based on the systems and control theory. The obtained models of the DPS development were analyzed and discussed. The studies were obtained model of the development of the DPS, and on the basis of is knowledge of the structural and parametrical changes of system development. The model can be used to analyze the design and development of the system from the point of view of the growth of internal organization system and the transition to higher levels of control.

Go to article

Authors and Affiliations

Jerzy Tchórzewski
Download PDF Download RIS Download Bibtex

Abstract

Casting is the most widely used manufacturing technique. Furan No-bake mould system is very widely accepted in competitive foundry

industries due to its excellent characteristics of producing heavy and extremely difficult castings. These castings have excellent surface

finish and high dimensional stability. Self setting and high dimensional stability are the key characteristics of FNB mould system which

leads to reduce production cycle time for foundry industries which will ultimately save machining cost, labour cost and energy.

Compressive strength is the main aspect of furan no bake mould, which can be improved by analyzing the effect of various parameters on

it. ANN is a useful technique for determining the relation of various parameters like Grain Fineness Number, Loss on Ignition, pH, % resin

and temperature of sand with compressive strength of the FNB mould. Matlab version: R2015a version 8.3 software with ANN tool box

can be used to gain output of relation. This paper deals with the representation of relationship of various parameters affecting on the

compressive strength of FNB mould

Go to article

Authors and Affiliations

S.G. Acharya
J.A. Vadher
Download PDF Download RIS Download Bibtex

Abstract

The article describes how to identify the boundary and yield surface for hypoplastic constitutive equations proposed by Wu, Gudehus and Bauer. It is shown how to identify and plot the surfaces for any equation in this class. Calculation errors are analyzed characteristic for applied set of numerical formulas. In the paper there are computer links to the source code prepared in the MATLAB system, based on instructions in the article. A sample consitutive domains are shown, plotted using the attached computer program.

Go to article

Authors and Affiliations

Z. Sikora
P. Cieśla
Download PDF Download RIS Download Bibtex

Abstract

This paper focused on a study concerned with the motion of platforms at loading stations during truck changing in Trucklift slope hoisting system built in Jaeryong open-pit iron mine, DPR of Korea. The motion of platform in Trucklift slope hoisting system produces undesirable effect on truck changing. To analyze the motion of platform during truck changing, we built the dynamic model in ADAMS environment and control system in MATLAB/Simulink. Simulation results indicate that the normal truck changing can be realized without arresters at loading stations by a reasonable structural design of platforms and loading stations.
Go to article

Bibliography

[1] A.A. Kuleshov, RU Patent, 2168630 C1, filed June 10 (2001).
[2] W . Peter, WO, 2008/138055 A1, filed Nov. 20 (2008).
[3] J.D. Tarasov, RU Patent, 2284958 C1, filed Oct. 10 (2006).
[4] http://www.siemagtecberg.com/infocentre/technical-information/ti_27-trucklift.html, accessed: 05.02.2017
[5] M. Schmid, Tire modeling for multibody dynamics applications. Technical Report, sbel.wisc.edu, University of Wisconsin‐Madison, 5-14 (2011)
[6] X.B. Ning, C.L. Zhao, J.H. Shen, Procedia Engineering 16, 333-341 (2011).
[7] X.Q. Zhang, B. Yang, C. Yang, G.N. Xu, Procedia Engineering 37, 120-124 (2012).
[8] P.G. Adamczyk, D. Gorsich, G. Hudas, J. Overholt, Proceedings of SPIE 5083, 63-74 (2003).
Go to article

Authors and Affiliations

Tok Hyong Han
1
ORCID: ORCID
Kwang Hyok Kim
1
ORCID: ORCID
Un Chol Han
2
ORCID: ORCID
Kwang Myong Li
2
ORCID: ORCID

  1. Kim Chaek University of Technology, Faculty of Mining Engineering, Pyongyang, Democratic People’s Republic of Korea
  2. Kim Chaek University of Technology, School of Science and Engineering, Pyongyang, Democratic People’s Republic of Korea
Download PDF Download RIS Download Bibtex

Abstract

With the extinction of fossil fuels and high increase in power demand, the necessity for renewable energy power generation has increased globally. Solar PV is one such renewable energy power generation, widely used these days in the power sector. The inverters used for power conversion suffer from power losses in the switching elements. This paper aims at the detailed analysis on switching losses in these inverters and also aims at increasing the efficiency of the inverter by reducing losses. Losses in these power electronic switches vary with their types. In this analysis the most widely used semiconductor switches like the insulated gate bipolar transistor (IGBT) and metal oxide semiconductor field effect transistor (MOSFET) are compared. Also using the sinusoidal pulse width modulation (SPWM) technique, improves the system efficiency considerably. Two SPWM-based singlephase inverters with the IGBT and MOSFET are designed and simulated in a MATLAB Simulink environment. The voltage drop and, thereby, the power loss across the switches are compared and analysed. The proposed technique shows that the SPWM inverter with the IGBT has lower power loss than the SPWM inverter with the MOSFET.
Go to article

Authors and Affiliations

Sivaraj Panneerselvam
1
ORCID: ORCID
Karunanithi Kandasamy
1
ORCID: ORCID
Chandrasekar Perumal
1
ORCID: ORCID

  1. Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Chennai, Tamil Nadu, India
Download PDF Download RIS Download Bibtex

Abstract

Progress in the industry is accompanied by the development of new materials and more efficient technological production processes. At present, additive production is becoming very attractive in all industries (research, development, production), which brings a number of advantages compared to subtractive methods (customization, production speed, control of material properties by users, etc.). The main advantage of 3D printing is the controlled deposition of material in defined places. Instead of demanding manual labour, fully automated production via computers leads to the manufacturing of complex components from materials whose production in conventional ways would be problematic or even impossible. Because these are new technologies, the main direction of research at present is to identify the basic physical properties of these materials under different types of loading.
The main goal of this article is to observe the dependence of the behaviour of the extruded material (thermoplastic reinforced with chopped carbon fibre) on the printing parameters (thickness of the lamina, the orientation of the fibres of the printed material, etc.). Based on published scientific works, it appears that these settings have a significant impact on the achieved physical properties. This is the reason why the authors decided to analyze the influence of these parameters on the basis of processed data from experimental measurements of mechanical properties in the MATLAB program. As this is FFF printing, an essential condition is to identify and specify the directional dependence of the behavior of the printed material. This physical phenomenon is a necessary condition for gradual knowledge for the purposes of a subsequent mathematical description of the material properties. According to the authors, for the purposes of modeling these materials in FEM-based programs, it is essential to define the directional dependence in the plane of the lamina.
Go to article

Authors and Affiliations

J. Majko
1
ORCID: ORCID
M. Handrik
1
ORCID: ORCID
M. Vaško
1
ORCID: ORCID
M. Sága
1
ORCID: ORCID
P. Kopas
1
ORCID: ORCID
F. Dorčiak
1
ORCID: ORCID
A. Sapietová
1
ORCID: ORCID

  1. University of Žilina, Faculty of Mechanical Engineering, Department of Applied Mechanics, Univerzitná 8215/1, 010 26 Žilina, Slovak Republic
Download PDF Download RIS Download Bibtex

Abstract

This paper aims to discuss the behavior of the proprietary real-time simulator (RTS) during testing the coordination of distance relay protections in power engineering. During the construction process of the simulator, the mapping of various dynamic phenomena occurring in the modeled part of the power system was considered. The main advantage to the solution is a lower cost of construction while maintaining high values of essential parameters, based on the generally available software environment (MATLAB/Simulink). The obtained results are discussed in detail. This paper is important from the point of view of the cost-effectiveness of design procedures, especially in power systems exploitation and when avoiding faults that result from the selection of protection relay devices, electrical devices, system operations, and optimization of operating conditions. The manuscript thoroughly discusses the hardware configuration and sample results, so that the presented real-time simulator can be reproduced by another researcher.
Go to article

Bibliography

  1.  M. Faruque, T. Strasser, and G. Lauss, “Real-Time Simulation Technologies for Power Systems Design, Testing and Analysis”, IEEE Power Energy Technol. Syst. J., vol. 2, no. 2, pp. 63‒73, 2015.
  2.  P.G. McLaren, R. Kuffel, R. Wierckx, J. Giesbrecht, and L. Arendt, “A real time digital simulator for testing relays”, IEEE Trans. Power Deliv., vol. 7, no. 1, pp. 207–213, 1992.
  3.  C. Dufour and J. Belanger, “A PC-based real-time parallel simulator of electric systems and drives”, Parallel Comput. Electr. Eng., vol. 7, no. 1, pp. 105–113, 2004.
  4.  D. Majstorovic, I. Celanovic, N.D. Teslic, N. Celanovic, and V.A. Katic, “Ultralow-latency hardware-in-the-loop platform for rapid validation of power electronics designs”, IEEE Trans. Ind.. Electron., vol. 58, no. 10, pp. 4708–4716, 2011.
  5.  R. Razzaghi, M. Mitjans, F. Rachidi, and M. Paolone, “An automated FPGA real-time simulator for power electronics and power systems electromagnetic transient applications”, Electr. Power Syst. Res. vol. 141, pp. 147–156, 2016.
  6.  F.R. Blánquez, E. Rebollo, F. Blázquez, and C.A. Platero, “Real Time Power Plant Simulation Platform for Training on Electrical Protections and Automatic Voltage Regulators”, 12th International Conference on Environment and Electrical Engineering, Wroclaw, Poland, 2013, pp.18‒22.
  7.  L.A. Montoya and D. Montenegro, “Adaptive Protection Testbed Using Real time and Hardware-in-the-Loop Simulation”, IEEE International Conference PowerTech., 2013, Grenoble, France, 2013, pp. 20‒24.
  8.  M. Krakowski and Ł. Nogal, “Testing power system protections utilizing hardware-in-the-loop simulations on real-time Linux”, Bull. Pol. Acad. Sci. Tech. Sci., vol. 68, no. 5, pp. 1099‒1105, 2020.
  9.  X. Guillaud et al., “Applications of Real-Time Simulation Technologies in Power and Energy Systems”, IEEE Power Energy Technol. Syst. J., vol. 2, no. 3, pp. 103–115, 2015.
  10.  M.D. Omar Faruque et al., “Real-Time Simulation Technologies for Power Systems Design, Testing, and Analysis”, IEEE Power Energy Technol. Syst. J., vol. 2, no. 2, pp. 63–73, 2015.
  11.  R. Kuffel, D. Ouellete, and P. Forsyth, “Real time simulation and testing using IEC 61850”, Modern Electric Power Systems, (MEPS) International Symposium, 2010, pp. 1‒8.
  12.  D. Gurusinghe, S. Kariyawasam, and D. Ouellette, “Testing of IEC 61850 sampled values based digital substation automation systems”, J. Eng., vol. 15, 2018, pp. 807–811.
  13.  M. Krakowski, K. Kurek, and Ł. Nogal, “Comparative analysis of the DAQ cards-based and the IEC 61850-based real time simulations in the matlab/simulink environment for power system protections”, Electr. Power Syst. Res., vol. 192, pp. 1‒6, 2021.
  14.  RTDS Technologies Inc., Real Time Digital Simulators, [Online] Available: https://www.rtds.com, (accesed: 10.01.2019).
  15.  OPAL-RT Technologies, [Online] Available: https://www.opal-rt.com, (accesed: 10.05.2019).
  16.  Z. Yang, Y. Wang, L. Xing, B. Yin, and J.Tao, “Relay Protection Simulation and Testing of Online Setting Value Modification Based on RTDS”, IEEE Access, vol. 8, pp. 4693‒4699, 2019.
  17. Simulink desktop realtime toolbox, [Online] Available: https://www.mathworks.com/products/simulink-desktop-real-time.html, (accesed: 10.02.2019).
  18.  F. Coffele, C. Booth, and A. Dysko, “An adaptive overcurrent protection scheme for distribution networks”, IEEE Trans. Power Deliv., vol 30, no. 1, pp. 561–568, 2015.
  19.  D. Dantas, “Energy and reactive power differential protectionhardware-in-the-loop validation for transformer application”, J. Eng., vol. 15, pp. 1160–1164, 2018.
  20.  Z. Xu, Z. Su, J. Zhang, A. Wen, and Q. Yang, “An interphase distance relaying algorithm for series-compensated transmission lines”, IEEE Trans. Power Deliv., vol. 29, no. 2, pp. 834–841, 2014.
  21.  R. Kuffel, P. Forsyth, and C. Peters, “The Role and Importance of Real Time Digital Simulation in the Development and Testing of Power System Control and Protection Equipment”, IFAC PapersOnLine, vol. 49‒27, pp. 178–182, 2016.
  22.  V. Papaspiliotopoulos, G. Korres, V. Kleftakis, and N. Hatziargyriou, “Hardware-in-theloop design and optimal setting of adaptive protection schemes for distribution systems with distributed generation”, IEEE Trans. Power Deliv., vol. 32, no. 1, pp. 393–400, 2015.
  23.  A. Smolarczyk, E. Bartosiewicz, R. Kowalik, and D.D. Rasolomampionona, „A Simple Real-Time Simulator for Protection Devices Test”, EnergyCon 2014, IEEE International Energy Conference, Dubrovnik, Croatia, 2014, pp. 837 – 843.
  24.  GE Digital Energy, D60 Line Distance Protection System. UR Series Instruction Manual, (accessed: 12.06.2018).
  25.  Advantech, [Online] Available: https://www.www.advantech.com, (accessed: 15.07.2019).
  26.  OMICRON electronics, CMS 156 Reference Manual,Version CMS156.AE.9, (accessed: 14.07.2020).
  27.  P. Opała, “Extension of a real time simulator for testing of protection relays”, M.Sc. thesis, Warsaw University of Technology, Electrical Power Engineering Institute, Warsaw, 2018.
Go to article

Authors and Affiliations

Adam Smolarczyk
1
ORCID: ORCID
Sebastian Łapczyński
1
ORCID: ORCID
Michał Szulborski
1
ORCID: ORCID
Łukasz Kolimas
1
ORCID: ORCID
Łukasz Kozarek
2
ORCID: ORCID

  1. Warsaw University of Technology, Faculty of Electrical Engineering, Electrical Power Engineering Institute, 00-662 Warsaw, Poland
  2. ILF Consulting Engineers Polska Sp. z o.o., ul. Osmańska 12, 02-823 Warsaw, Poland
Download PDF Download RIS Download Bibtex

Abstract

Simplified optimization method using the MATLAB function fminbnd was adopted to determine the optimal feed temperature (OFT) for an isothermal packed-bed reactor (PBR) performing hydrogen peroxide decomposition (HPD) by immobilized Terminox Ultra catalase (TUC). The feed temperature was determined to maximize (minimize) the average reactant conversion (reactant concentration) over a fixed period time at the reactor outlet. The optimization was based on material balance and rate equation for enzyme action and decay and considered the effect of mass-transfer limitations on the system behavior. In order to highlight the relevance and applicability of the work reported here, the case of optimality under isothermal operating conditions is considered and the practical example is worked out. Optimisation method under consideration shows that inappropriate selection of the feed temperature may lead to a decrease in the bioreactor productivity.
Go to article

Authors and Affiliations

Ireneusz Grubecki
1
ORCID: ORCID
Wirginia Tomczak
2
ORCID: ORCID

  1. Cracow University of Technology, Faculty of Chemical Engineering and Technology, Warszawska 24, 31-155 Cracow, Poland
  2. Bydgoszcz University of Science and Technology, Seminaryjna 3, 85-326 Bydgoszcz, Poland
Download PDF Download RIS Download Bibtex

Abstract

Time-of-use (TOU) electricity pricing has been applied in many countries around the world

to encourage manufacturers to reduce their electricity consumption from peak periods to

off-peak periods. This paper investigates a new model of Optimizing Electricity costs during

Integrated Scheduling of Jobs and Stochastic Preventive Maintenance under time of-use

(TOU) electricity pricing scheme in unrelated parallel machine, in which the electricity price

varies throughout a day. The problem lies in assigning a group of jobs, the flexible intervals

of preventive maintenance to a set of unrelated parallel machines and then scheduling of jobs

and flexible preventive maintenance on each separate machine so as to minimize the total

electricity cost. We build an improved continuous-time mixed-integer linear programming

(MILP) model for the problem. To the best of our knowledge, no papers considering both

production scheduling and Stochastic Preventive Maintenance under time of-use (TOU) electricity

pricing scheme with minimization total Electricity costs in unrelated parallel machine.

To evaluate the performance of this model, computational experiments are presented, and

numerical results are given using the software CPLEX and MATLAB with then discussed.

Go to article

Authors and Affiliations

Sadiqi Assia
El Abbassi Ikram
El Barkany Abdellah
Darcherif Moumen
El Biyaali Ahmed
Download PDF Download RIS Download Bibtex

Abstract

The development of electric vehicles (EV) necessitates the search for new solutions for configuring powertrain systems to increase reliability and efficiency. The modularity of power supplies, converters, and electrical machines is one such solution. Among modular electric machines, dual three-phase (DTP) motors are the most common in high-power drives. To simplify low and medium power drives for EVs based on DTP PM motor, it is proposed to use a BLDC drive and machine of the simplest design – with concentrated windings and surface mounted PMs on the rotor. To study and create such drives, an improved mathematical model of DTP PM machine was developed in this work. It is based on the results of 2D FEM modeling of the magnetic field. According to the developed method, the dependences of the self and mutual inductances between all phase windings from the angle of rotor position and loads of different motor modulus were determined. Based on these inductances, the circuit computer model of DTP PM machine was created in the Matlab/Simulink. It has a high simulation speed and a high level of adequacy, which is confirmed by experimental studies with a mock-up sample of the electric drive system.
Go to article

Authors and Affiliations

Ihor Shchur
1
Damian Mazur
2
ORCID: ORCID
Olekcandr Makarchuk
1 3
Ihor Bilyakovskyy
1
Valentyn Turkovskyi
1
Bogdan Kwiatkowski
4
ORCID: ORCID
Dawid Kalandyk
5

  1. Department of Electric Mechatronics and Computer-Controlled Electromechanical Systems, Lviv Polytechnic National University, Lviv 79013, Ukraine
  2. Department of Electrical Engineering and Fundamentals of Computer Science, Rzeszow University of Technology, Rzeszow 35-959, Poland
  3. Faculty of Electrical Engineering, Czestochowa University of Technology, Czestochowa 42-200, Poland
  4. Department of Electrical Engineering and Fundamentals of ComputerScience, Rzeszow University of Technology, Rzeszow 35-959, Poland
  5. Doctoral School of Engineering and Technical Sciences at the Rzeszow University of Technology, Rzeszów 35-959, Poland

This page uses 'cookies'. Learn more