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A Modern Approach to the Asynchronous Sequential Circuit Synthesis

Piotr Czekalski Krzysztof Tokarz Bolesław Pochopień
Theoretical and Applied Informatics | 2014 | vol. 26 | No 1-2 | 25-37
Keywords logic circuits automatic control web service
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Abstract

This paper presents novel approach to the Huffman’s asynchronous sequential circuit two valued Boolean switching system design. The algorithm is implemented as software using distributed, service oriented application model with means of the web service component design. It considers method implementation challenges, both towards Moore and Mealy structures with particular respect to the estimation of the Huffman’s minimization algorithm computational complexity. The paper provides implementation details, theoretical model estimation and experimental results that acknowledge the theoretical approach in practice. This paper also examine the multistep design process implementation and its problems inherent in web service based environment both for development and educational purposes.

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Authors and Affiliations

Piotr Czekalski
Krzysztof Tokarz
Bolesław Pochopień

Evaluation of the Sedimentation Process in the Thickener by Using the Parameters of Longitudinal Ultrasonic Oscillations and Lamb Waves

Vladimir Morkun Natalia Morkun Vitaliy Tron Oleksandra Serdiuk Alona Haponenko
Archives of Acoustics | 2023 | vol. 48 | No 4 | 539-548 | DOI: 10.24425/aoa.2023.146819
Keywords thickener ultrasound automatic control modeling parameter estimation
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Abstract

Water is widely used in the mining industry, particularly in mineral enrichment processes. In the process of magnetic separation or flotation of crushed ore, a concentrate (an enriched product), and tailings (a product with a low content of a useful component) are obtained. One of the main tasks of enrichment processes is the efficient use of water resources. This is achieved by reclaiming and subsequent reusing water contained in ore beneficiation products by extracting it in industrial thickeners. Optimizing this process makes it possible to reduce water usage in the mining industry, reduce costs of mineral enrichment processes, and address extremely urgent environmental protection problems. To evaluate the process of sedimentation of the solid phase in the pulp within the thickener, measurements of parameters of longitudinal ultrasonic oscillations and Lamb waves that have traveled a fixed distance in the pulp and along the measuring surface in contact with it are used. The proposed approach allows for the consideration of pulp density, particle size of the solid phase in the ore material and the dynamics of changes in these parameters in the thickener at the initial stage of the sedimentation process. Based on the obtained values, adjustments can be made to the characteristics of its initial product, leading to reduced water usage and minimized loss of a useful component.
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Authors and Affiliations

Vladimir Morkun
1
Natalia Morkun
1
Vitaliy Tron
1
Oleksandra Serdiuk
1
Alona Haponenko
1
  1. Kryvyi Rih National University, Kryvyi Rih, Ukraine

Nonlinear Dynamics of a Controlled Stirred Tank Bioreactor With Predator-Prey Relationship

Bolesław Tabiś Szymon Skoneczny Wojciech S. Stryjewski
Chemical and Process Engineering | 2014 | No 3 September | 349-360 | DOI: 10.2478/cpe-2014-0026
Keywords predator-prey dynamics automatic control steady states bioreactor
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Abstract

The paper presents the dynamic characteristics of a continuous tank bioreactor for microbiological process, with a developed predator-prey food chain. The presence of the predator microorganism considerably influences the position and stability character of steady-states. There appears to exist a wide range of unstable steady-states and high-amplitude oscillations of state variables. Without automatic control, the system can operate only in unsteady conditions. From technological point of view, this circumstance is unfavorable. It was shown that oscillations can be removed by employing automatic control with continuous P or PI controllers. Moreover, the use of a controller with integrating element causes removal of the predator from the bioreactor. The paper discusses an application of this phenomenon for practical purposes.

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Authors and Affiliations

Bolesław Tabiś
Szymon Skoneczny
Wojciech S. Stryjewski

Automatic Laser Interferometer And Vision Measurement System For Stripe Rod Calibration

Min Zhao Qiu-Hong Huang Ling-Jian Zhu Zong-Ming Qiu
Metrology and Measurement Systems | 2015 | vol. 22 | No 4 | 491-502
Keywords stripe edge automatic control laser interferometer vision measurement
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Abstract

In order to calibrate the stripe precision of a leveling rod, an automatic laser interferometer and a vision measurement system were designed by Xi’an University of Technology in China. The rod was driven by a closed-loop control and the data were collected at the stop state to ensure precision. The laser interferometer provided not only the long distance data but also a position feedback signal in the automatic control loop. CCD camera and a vision measurement method were used to inspect the stripe edge position and defect. A pixel-equivalent self-calibration method was designed to improve precision. ROI (regions of interest) method and an outline tracing method were designed to quickly extract multiple stripe edges. A combination of the image data with the interferometer data reduces control difficulty and ensures the measurement accuracy. The vision measurement method reached sub-pixel precision and the defective edges were reported. The system can automatically calibrate a stripe leveling rod with a high degree of efficiency and precision.
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Authors and Affiliations

Min Zhao
Qiu-Hong Huang
Ling-Jian Zhu
Zong-Ming Qiu

Hydrodynamic tilting pad journal bearing with automatic control

Andrejus Marcinkevičius
Archive of Mechanical Engineering | 2010 | vol. 57 | No 4 | 343-354 | DOI: 10.2478/v10180-010-0019-6
Keywords hydrodynamic bearing automatic control wear and temperature decrease data of main properties
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Abstract

Hydrodynamic three tilting-pad journal bearing is analyzed in the paper. It is shown that, when assembling that type of not controlled bearing, it is impossible to obtain a small clearance between the pad and the journal at high frequency of journal rotation. In a static state, i.e. when the journal is immobile, such a bearing should be assembled with a large interference between the pads and the journal in order to guarantee the small clearance at rotation. At start, when the hydrodynamic lubricating wedges between the pads and journal are absent, the bearing would work with dry friction, resulting in quick wear of pads and high load of the drive motor. Apart of that, it is impossible to control the power consumption and temperature regime neither for idle nor for working rotation of the journal. The proposed automatic control gives a possibility to regulate the clearance between the pads and the journal by measuring and controlling the axial force of the pad load, and in such a way to improve work conditions of the bearing.

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Authors and Affiliations

Andrejus Marcinkevičius

The Stability Interval of the Set of Linear System

Talgat Mazakov Waldemar Wójcik Sholpan Jomartova Nurgul Karymsakova Gulzat Ziyatbekova Aisulu Tursynbai
International Journal of Electronics and Telecommunications | 2021 | vol. 67 | No 2 | 155-161 | DOI: 10.24425/ijet.2021.135958
Keywords automatic control system stability matrix minor characteristic polynomial Hurwitz criterion Lienard-Shipard criterion of interval mathematics Lyapunov function
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Abstract

The article considers the problem of stability of interval-defined linear systems based on the Hurwitz and Lienard- Shipar interval criteria. Krylov, Leverier, and Leverier- Danilevsky algorithms are implemented for automated construction and analysis of the interval characteristic polynomial. The interval mathematics library was used while developing the software. The stability of the dynamic system described by linear ordinary differential equations is determined and based on the properties of the eigenvalues of the interval characteristic polynomial. On the basis of numerical calculations, the authors compare several methods of constructing the characteristic polynomial. The developed software that implements the introduced interval arithmetic operations can be used in the study of dynamic properties of automatic control systems, energy, economic and other non-linear systems.
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Authors and Affiliations

Talgat Mazakov
1
Waldemar Wójcik
2
Sholpan Jomartova
1
Nurgul Karymsakova
3
Gulzat Ziyatbekova
1
Aisulu Tursynbai
3
  1. Institute of Information and Computational Technologies CS MES RK, Al-Farabi Kazakh National University, Almaty, Kazakhstan
  2. Lublin Technical University, Poland
  3. Al-Farabi Kazakh National University, Almaty, Kazakhstan

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