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Volume 71, Issue 4
 
December 2021
 
DOI: 10.47978/TUS.2021.71.04

Table of Contents

 
Application of Volume of Fluid Method for the Droplet Modelling in Microfluidic Channels
Emil Grigorov
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Fractional Control of а Model of the Current-Decoupled AC Motor
B. Grasiani, N. Nikolova
PDF
Bioengineering – Current Applications and Future Perspectives
Boris Kirov, Slavil Peykov
PDF
Robust DRC-Systems
Emil Nikolov
PDF
Investigation of best Practices in Building of Smart Homes Control Systems
Alexandra N. Georgieva
PDF
Operation with a Smart Manufacturing System
A. Taneva, K. Kutryanski, M. Petrov
PDF
Enzyme Biosensor for Determination of Glucose in Honey Bee
Antonia L. Pandelova, Dimitar I. Dimitrov, Nikolay S. Stoyanov
PDF
Development of a system for measurement of carbon monoxide and smoke detection
Antonia L. Pandelova, Todor M. Georgiev, Nikolay S. Stoyanov, Bozhidar P. Dzhudzhev
PDF
Analysis of Load Profiles with Dynamic Loads, External Consumption and Added PV Generation
George S. Milushev
PDF
 

 Application of Volume of Fluid Method for the Droplet Modelling in Microfluidic Channels
Emil Grigorov

Abstract
We used the volume-of-fluid (VOF) method to investigate the droplet formation regime and its transition in a square microfluidic flow-focusing device. Droplet shape, size, and its formation frequency were examined in a three-dimensional numerical simulation. The results were evaluated through examination of the regimes of droplet formation and the formation of droplet of a given size as a function of different parameters. Comparison of the simulation results with preexisting experimental data from the literature showed good agreement, validating the VOF method.

Keywords
microfluidics, droplets, modeling, CFD, Volume of Fluid.

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DOI: 10.47978/TUS.2021.71.04.001

 

Fractional Control of а Model of the Current-Decoupled AC Motor
B. Grasiani, N. Nikolova

Abstract
This paper proposes an approach to oppose the parameters disturbances in a control system. This control principle is applied in the present work to the Current-Decoupled AC Motor of a technological module.

Keywords
fractal control, robust stability margin, robust performance margin, robust performance, robust stability.

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DOI: 10.47978/TUS.2021.71.04.002
 

Bioengineering – Current Applications and Future Perspectives
Boris Kirov, Slavil Peykov

Abstract
The field of Bioengineering has provoked significant interest both as a theoretical approach towards a better understanding of living systems and as a compilation of applied methods for improved control over such systems. In the latter aspect, significant success has been achieved in decoding biological information formatted as genes and genomes, modeling of biological processes such as the metabolic conversion of matter and energy, design and engineering of novel biological parts like synthetic promoters and mutator devices, and, finally, development of novel types of bioprocess systems with improved control capability like microfluidics devices. In this work, we present the achievements of BioInfoTech Lab in all the above-mentioned applied areas and we elaborate on the future possibilities which the field of Bioengineering provides.

Keywords
Bioengineering, Genomics, Metabolic mode-ling, Microfluidics.

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DOI: 10.47978/TUS.2021.71.04.003
 

Robust DRC-Systems
Emil Nikolov

Abstract
In this work are proposed, researched, and analyzed structures, methods, and algorithms for designing of fractional DRC-, DRC. Clegg-, DRC.Clegg.Inverse- robust systems. For their development, inverse solutions of the synthesis problem were used using rational fractional operators from the theory of generalized fractional calculus. Their potential advantages are proven. Results of perturbation analysis for numerical examples are presented.

Keywords
inverses models, fractional DRC-, DRC.Clegg-, DRC.Clegg.Inverse-systems, ML-Clegg-differentiation filters, perturbation quality analysis.

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DOI: 10.47978/TUS.2021.71.04.004
 

Investigation of best Practices in Building of Smart Homes Control Systems
Alexandra N. Georgieva

Abstract
As energy used in a home is increasing and renewable energy systems are deployed, so home energy management system (HEMS) requires both energy consumption and generation simultaneously to reduce the energy cost. One of the major attributes of the smart grid is to integrate renewable and storage energy resources at the consumption premises. This article presents the methods used in smart home control systems in the integration of renewable energy sources (RES), battery storage, and other electricity sources. The work also investigates the methods for optimization of the house’s consumption in case of integration of heat and cold sources including renewable heat generation (RES). Smart homes save energy and heat, which is why they are eco-friendly and can even be cheaper to live in. In near future the smart houses will present a significant part of the participants at the energy markets, so the optimization methods investigation having economical parameters is also in the scope of this investigation.

Keywords
smart house, renewable energy sources, demand response, optimal control of energy systems.

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DOI: 10.47978/TUS.2021.71.04.005
 

Operation with a Smart Manufacturing System
A. Taneva, K. Kutryanski, M. Petrov

Abstract
The aim of this paper is to present basic hardware components of a flexible assembly system (FAS) and discuss its characteristics, classify the systems and describe a real application. The FAS-200 system offers professional training according to the industrial reality, simulating a real assembly process and including different technologies from Industry 4.0. This system consists of an automated flexible assembly cell with five different stages: assembly, handling, quality inspection, transfer, and warehouse. The FAS-200 system is the ideal answer to research and training in industrial automation. It is fully modular and flexible equipment and in keeping with industrial reality. The technologies included in its different assembly modules, as well as the assembly process with several variants, allow the user to develop the professional skills required by the modern automated industry.

Keywords
Flexible manufacturing systems, Flexible assembly systems, Intelligent manufacturing systems.

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DOI: 10.47978/TUS.2021.71.04.006
 

Enzyme Biosensor for Determination of Glucose in Honey Bee
Antonia L. Pandelova, Dimitar I. Dimitrov, Nikolay S. Stoyanov

Abstract
an enzyme biosensor for the determination of glucose in honey was developed by using enzyme glucose oxidase. The measuring range of the biosensor and its response is determined. A measurement with real samples was made.

Keywords
biosensor, glucose, honey.

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DOI: 10.47978/TUS.2021.71.04.007
 

Development of a system for measurement of carbon monoxide and smoke detection
Antonia L. Pandelova, Todor M. Georgiev, Nikolay S. Stoyanov, Bozhidar P. Dzhudzhev

Abstract
carbon monoxide is a colorless and odorless gas that is lighter than air; it can cause symptoms of poisoning to vary degrees, which can lead to serious consequences. The aim of the report is to develop a system for measuring the concentration of carbon monoxide and smoke. An electrochemical sensor MQ-2 and an Arduino platform were used for the development of the system. A series of experiments were performed to test the system – in the city park, in underground parking, garage, indoor. The obtained results are analyzed.

Keywords
carbon monoxide, MQ-2, Arduino Uno.

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DOI: 10.47978/TUS.2021.71.04.008
 

Analysis of Load Profiles with Dynamic Loads, External Consumption and Added PV Generation
George S. Milushev

Abstract
The Examination of Load Profiles is a powerful method for specifying problematic loads in installations. The examiner's experience plays a significant role in reaching the proper conclusions and deciding the next actions to mitigate negative effects, disconnection, replacing, or removal of the problematic loads. Usually, an examiner gains experience over time as they encounter various cases throughout their career. A way to expedite the process of obtaining a better experience is by sharing and studying complex cases documented by other experts from the engineering community. The present paper aims to share an experience of analysis of load profiles of a client with very dynamic own loads, additional external consumption out of his own premises and installed PV generation for internal needs only.

Keywords
Energy efficiency, Load management, Photovoltaic systems, Power engineering, Power generation.

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DOI: 10.47978/TUS.2021.71.04.009


Last changed on 04.11.2021, 14:01:14