Last issue
2018 (vol. 28) - Number 4


T. Kaczorek:

A new method for computation of positive realizations of fractional linear continuous-time systems



A. Biswas, A. Sarkar:

Development of dual hesitant fuzzy prioritized operators based on Einstein operations with their application to multi-criteria group decision making



L. Li, R. Zhang, J. Wang, X. Shang:

Some q-orthopair linguistic Heronian mean operators with their application to multi-attribute group decision making



J. Duda:

Lyapunov matrices approach to the parametric optimization of a system with two delays and a PD controller



M. Lhous, M. Rachik, El M. Magri:

Ideal observability for bilinear discrete-time systems with and without delays in observation



P.T. Anh, A. Babiarz, A. Czornik, M. Niezabitowski:

Variation of constant formulas for fractional difference equations



K. Bingi, R. Ibrahim, M. Noh Karsiti, S. Miya Hassan, V. Rajah Harindran:

A comparative study of 2DOF PID and 2DOF fractional order PID controllers on a class of unstable systems




ACS Abstract:

2018 (Volume 28)
Number 3
1.

Exact and approximate controllability conditions for the micro-swimmers deflection governed by electric field on a plane: The Green's function approach

2.

Navigation of humanoids by a hybridized regression-adaptive particle swarm optimization approach

3.

Flexible function block for industrial applications of~active disturbance rejection controller

4.

Definition of dynamic characteristics of pointer measuring devices on the basis of automatic indications determination

5.

Methods of planning deliveries of food products to a trade network with the selection of suppliers and transport companies

6.

The practical stability of the discrete, fractional order, state space model of the heat transfer process

7.

Engineering example of the constraint forces in non-holonomic mechanical: forklift-truck robot motion. Part I

8.

A new chaotic system with axe-shaped equilibrium, its circuit implementation and adaptive synchronization



Exact and approximate controllability conditions for the micro-swimmers deflection governed by electric field on a plane: The Green's function approach

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As.Zh. Khurshudyan
(NAS of Armenia, Shanghai Jiao Tong University, China)

We study the exact and approximate controllabilities of the Langevin equation describing the Brownian motion of particles with a white noise. The Langevin equation is shown to describe also the bacterial run-and-tumble motion. Applying the Green's function approach to the Green's function representation of the Langevin equation, we obtain necessary and sufficient conditions for exact controllability in the form of a finite-dimensional problem of moments. For the approximate controllability, we obtain only sufficient conditions. The sets of resolving controls are characterized in both cases. The theoretical derivations are supported by a numerical analysis.

keywords: run, tumble, micro-swimmers, Green's function of nonlinear equation, discontinuous control

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Navigation of humanoids by a hybridized regression-adaptive particle swarm optimization approach

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P.B. Kumar, C. Sahu, D.R. Parhi
(National Institute of Technology, India)

In the era of humanoid robotics, navigation and path planning of humanoids in complex environments have always remained as one of the most promising area of research. In this paper, a novel hybridized navigational controller is proposed using the logic of both classical technique and computational intelligence for path planning of humanoids. The proposed navigational controller is a hybridization of regression analysis with adaptive particle swarm optimization. The inputs given to the regression controller are in the forms of obstacle distances, and the output of the regression controller is interim turning angle. The output interim turning angle is again fed to the adaptive particle swarm optimization controller along with other inputs. The output of the adaptive particle swarm optimization controller termed as final turning angle acts as the directing factor for smooth navigation of humanoids in a complex environment. The proposed navigational controller is tested for single as well as multiple humanoids in both simulation and experimental environments. The results obtained from both the environments are compared against each other, and a good agreement between them is observed. Finally, the proposed hybridization technique is also tested against other existing navigational approaches for validation of better efficiency.

keywords: navigation, humanoid NAO, RA, APSO, Petri-Net, V-REP

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Flexible function block for industrial applications of~active disturbance rejection controller

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P. Nowak, K. Stebel, T. Klopot, J. Czeczot, M. Fratczak, P. Laszczyk
(Silesian University of Technology, Poland)

In this paper, the PLC-based (Programmable Logic Controller) industrial implementation in the form of the general-purpose function block for ADRC (Active Disturbance Rejection Controller) is presented. The details of practical aspects are discussed because their reliable implementation is not trivial for higher order ADRC. Additional important novelties discussed in the paper are the impact of the derivative backoff and the method that significantly simplifies tuning of higher order ADRC by avoiding the usual trial and error procedure. The results of the practical validation of the suggested concepts complete the paper and show the potential industrial applicability of ADRC.

keywords: industrial control systems, active disturbance rejection control (ADRC), practical tuning, practical implementation, programmable logic controller (PLC)

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Definition of dynamic characteristics of pointer measuring devices on the basis of automatic indications determination

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V. Kucheruk, P. Kulakov, A. Kulakova
(Vinnytsia National Technical University, Ukraine)
I. Kurytnik
(State Higher School in Oswiecim, Poland)
R. Lishchuk
(Uman National University of Horticulture, Ukraine)
Y. Moskvichova
(Vinnytsia State Pedagogical University, Ukraine)

The article presents the method and algorithm of automatic pointer measuring devices (voltmeter, manometer, metronomes etc.) indications determination in order to determine their dynamic characteristics with the help of web-camera and personal computer. The results of testing and experimental research of developed tool for determining the dynamic characteristics of pointer measuring devices are given. Using this method, the algorithm and the software developed, the process of determining the dynamic characteristics of the pointer measuring devices was automated. The time of recognition and calculation of one measured value for a dual-core processor and webcam with a resolution of 0.3 Mp averages 250--330 ms.

keywords: pointer measuring devices, binarization, skeletonization, recognition, dynamic characteristics

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Methods of planning deliveries of food products to a trade network with the selection of suppliers and transport companies

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M. Magiera
(AGH University of Science and Technology, Poland)

The paper refers to planning deliveries of food products (especially those available in certain seasons) to the recipients: supermarket networks. The paper presents two approaches to solving problems of simultaneous selection of suppliers and transportation modes and construction of product flow schedules with these transportation modes. Linear mathematical models have been built for the presented solution approaches. The cost criterion has been taken into consideration in them. The following costs have been taken into account: purchase of products by individual recipients, transport services, storing of products supplied before the planned deadlines and penalties for delays in supply of products. Two solution approaches (used for transportation planning and selection of suppliers and selection of transportation modes) have been compared. The~monolithic approach calls for simultaneous solutions for the problems of supplier selection and selection of transportation modes. In the alternative (hierarchical) solution approach, suppliers are selected first, and then transportation companies and their relevant transportation modes are selected. The results of computational experiments are used for comparison of the hierarchical and monolithic solution approaches.

keywords: supply network, supply chain management, logistics, integer programming, transportation, scheduling, hierarchical planning

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The practical stability of the discrete, fractional order, state space model of the heat transfer process

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K. Oprzedkiewicz
(AGH University of Science and Technology, Poland)
E. Gawin
(High Vocational School in Tarnow, Poland)

In the paper the practical stability problem for the discrete, non-integer order model of one dimensional heat transfer process is discussed. The conditions associating the practical stability to sample time and maximal size of finite-dimensional approximation of heat transfer model are proposed. These conditions are formulated with the use of spectrum decomposition property and practical stability conditions for scalar, positive, fractional order systems. Results are illustrated by a numerical example.

keywords: discrete non-integer order system, heat transfer, diffusion equation, Grunvald-Letnikov operator, practical stability

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Engineering example of the constraint forces in non-holonomic mechanical: forklift-truck robot motion. Part I

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S. Haddout, M.A. Guennoun
(Ibn Tofail University, Morocco)
Z. Chen
(University of British Columbia, Canada)

In the presented paper, a problem of nonholonomic constrained mechanical systems is treated. New methods in nonholonomic mechanics are applied to a problem of a Forklift-truck robot motion. This method of the geometrical theory of general nonholonomic constrained systems on fibered manifolds and their jet prolongations, based on so-called Chetaev-type constraint forces. The relevance of this theory for general types of nonholonomic constraints, not only linear or affine ones, was then verified on appropriate models. On the other hand, the equations of motion of a Forklift-truck robot are highly nonlinear and rolling without slipping condition can only be expressed by nonholonomic constraint equations. In this paper, the geometrical theory is applied to the above mentioned mechanical problem. The results of numerical solutions of constrained equations of motion, derived within the theory, are presented.

keywords: forklift-truck robot; Lagrangian systems, nonholonomic constraints, reduced equations of motion, numerical solution

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A new chaotic system with axe-shaped equilibrium, its circuit implementation and adaptive synchronization

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S. Vaidyanathan
(Vel Tech University, India)
A. Sambas
(Universiti Sultan Zainal Abidin, Malaysia, Universitas Muhammadiyah Tasikmalaya, Indonesia)
M. Mamat
(Universiti Sultan Zainal Abidin Gong Badak, Malaysia)

In the recent years, chaotic systems with uncountable equilibrium points such as chaotic systems with line equilibrium and curve equilibrium have been studied well in the literature. This reports a new 3-D chaotic system with an axe-shaped curve of equilibrium points. Dynamics of the chaotic system with the axe-shaped equilibrium has been studied by using phase plots, bifurcation diagram, Lyapunov exponents and Lyapunov dimension. Furthermore, an electronic circuit implementation of the new chaotic system with axe-shaped equilibrium has been designed to check its feasibility. As a control application, we report results for the synchronization of the new system possessing an axe-shaped curve of equilibrium points.

keywords: chaos, chaotic systems, curve equilibrium, Lyapunov exponents, circuit design, synchronization

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