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| Електронна визитка | ас. инж. Мирослав Левентов Кокаларов
Отговорник по кандидатстудентски прием
на факултет „Машиностроене и уредостроене“
Катедра "Машиностроене и уредостроене"
Факултет „Машиностроене и уредостроене“
Технически университет - Габрово
ул. "Хаджи Димитър" № 47, корпус № 2 – „Баждар“, каб. 2402 А
сл. тел.: +359 66 827 443 | |
| Публикация: №1 | Kokalarov, M., N. Angeov "RESEARCH OF PROSPECTS FOR APPLICATION OF PHOTOGRAMMETRIC AND STEREOPHOTOGRAMMETRIC METHODS OF MEASUREMENT IN MECHANICAL ENGINEERING AND INDUSTRIAL ENGINEERING" Сборник с доклади от Международна научна конференция “УНИТЕХ’24” – Габрово, (2024): pp. 1-8. | | Издателство: | Сборник с доклади от Международна научна конференция “УНИТЕХ’24” – Габрово | | Изд.год.: | 2024 | | Вид: | Научна публикация - Доклад от межд. конф. в Б-я | | Абстракт: | The report examines the results of the team's research on the application of the photogrammetric method, from its beginnings to its modern applications for the measurement of small and large objects in the field of fine mechanics and technique. The theoretical foundations of the method are described, as well as its application for measuring deformations in mechanical structures and engineering equipment. The paper analyzes the key factors that have a significant influence on the accuracy of the measurements and the uncertainty budget. Typical errors that occur under specific conditions of operation of the method and concrete types of equipment are considered, such as recommendations are offered to minimize these errors. Particular attention is paid to the initial stage of using the stereophotogrammetric method for measuring large objects and deformations in mechanical engineering and industrial engineering. The main dependencies of the method are presented through the analysis of its constituent elements. According to the authors, this method has significant potential for future application in manufacturing processes. Purposes for continued research to improve the accuracy of the methods and expand their practical application have been determined. Recommendations are given regarding the main technical characteristics, equipment requirements and the application of the methods in a real working environment. | | Web: | https://www.unitech.tugab.bg/component/sppagebuilder/page/18 | | Пълен текст: | Изтегли | |
| Публикация: №2 | Angelov, N., M. Kokalarov, NUMERICAL EXPERIMENTS TO INVESTIGATE THE LASER MARKING PROCESS OF C35 STEEL SAMPLES, International Scientific Conference “UNITECH 2024” – Gabrovo, (2024): pp. 1-7. DOI: 10.70456 | | Издателство: | International Scientific Conference “UNITECH 2024” – Gabrovo | | Изд.год.: | 2024 | | Вид: | Научна публикация - Доклад от межд. конф. в Б-я | | Абстракт: | The research concerns the process of laser marking by melting C35 structural steel samples. Numerical experiments are done for fiber laser and CuBr laser technological systems. Temperature fields are obtained for different values of power density, speed and two values of wavelength. The temperature dependence of the material parameters was reported. Graphs of temperature versus power density for three speeds and temperature vs. speed for three power densities are plotted. The results have been analyzed and preliminary operating intervals have been determined for these quantities for the laser marking process by melting. | | Web: | https://www.unitech.tugab.bg/component/sppagebuilder/page/18 | | Пълен текст: | Изтегли | |
| Публикация: №3 | Kokalarov, M., D. Dichev, B. Sotirov, S. Parvanov, B. Sakakakushev "Accuracy Analysis Methods for Photogrammetric Measurements in Industrial Production" 2024 XXXIV International Scientific Symposium Metrology and Metrology Assurance (MMA), (2024): pp. 1-5. DOI: 10.1109/MMA62616.2024.10817674 | | Издателство: | 2024 XXXIV International Scientific Symposium Metrology and Metrology Assurance (MMA) | | Изд.год.: | 2024 | | Вид: | Научна публикация - Доклад от межд. конф. в Б-я | | Абстракт: | The following article examines the implementation of photogrammetric measuremet method(PhMM) in heavy-duty machineryconstruction, giving accent to the accuracy of this method and the error analyses methods. The study focuses on key factors, influencing the accuracy of the measurements, such as focus distance, base distance and paralax. The article makes an analisis how these parameters influence the space coordinates of the objects through the methods of error dispersement and offers ways of optimization of the measurement process. The results of the study shows, that the photogrammetric methodis reliable and effective tool for precise measurement of complex geometric shapes and constructions in theindustrial production. The article emphasises the importance of the high accuracy of measurements and gives reccomendations on improvement of the measurement processes throughphotogrammetry. | | Web: | https://ieeexplore.ieee.org/document/10817674 | | Пълен текст: | Изтегли | |
| Публикация: №4 | Karadzhov, Ts., M. Kokalarov, B. Georgiev "Accuracy Measurement System for Mechanical Watch via the Computer's built-in Microphone" 2024 XXXIV International Scientific Symposium Metrology and Metrology Assurance (MMA), (2024): pp. 1-5. DOI: 10.1109/MMA62616.2024.10817670 | | Издателство: | 2024 XXXIV International Scientific Symposium Metrology and Metrology Assurance (MMA) | | Изд.год.: | 2024 | | Вид: | Научна публикация - Доклад от межд. конф. в Б-я | | Абстракт: | This paper presents a new system for measuring the accuracy of mechanical clocks using the computer's built-in microphone. The system is based on the analysis of acoustic signals generated by the balance wheel of the watch and offers an innovative and affordable method to assess the dynamic accuracy of time in real conditions. The accuracy of a mechanical watch is an important parameter related to multiple factors such as oscillations, shocks and vibrations that affect its precise functioning. In this context, the developed system provides a readily applicable alternative to measure and improve the accuracy of watches using standard computational devices and acoustic analyses. The proposed methodology contributes to expanding the possibilities of investigating the dynamic characteristics of mechanical watches in the scientific community and metrology research. | | Web: | https://ieeexplore.ieee.org/document/10817670 | | Пълен текст: | Изтегли | |
| Публикация: №5 | Kokalarov, M., D. Dichev, B. Sotirov, S. Parvanov, B. Sakakakushev "Implementation of the Stereophotogrametric Method for Measurement of Deformations in Engineering Structures and Constructions" 2024 XXXIV International Scientific Symposium Metrology and Metrology Assurance (MMA), (2024): pp. 1-4. DOI: 10.1109/MMA62616.2024.10817627 | | Издателство: | 2024 XXXIV International Scientific Symposium Metrology and Metrology Assurance (MMA) | | Изд.год.: | 2024 | | Вид: | Научна публикация - Доклад от нац. конф. в чужбина | | Абстракт: | The article presents a stereophotogramertric method of deformation measurement in heavy-duty machinery building and engineering constructions. The method is based on space measurements and observations, which provide high accuracy and precision in the deformation analyses in a three-dimentional space. A special focus is given on the applicability of the method with the usage of a easy-to-access equipment, such as digital cameras and personal computers, which makes it cost-effective and suitable for various engineering applications. The analyses of the results demonstrates, that the stereophotogrametry provides reliable measurements, as also allowes observation and evaluation of the defformations in real time. Despite some restrictions, mainly in connection with optic distortion and the immage quality, the method has been affirmed as a key tool in contemporary machine-building, with potential for further development and refinement. | | Web: | https://ieeexplore.ieee.org/document/10817627 | | Пълен текст: | Изтегли | |
| Публикация: №6 | Tsvetanov, G. , Kokalarov, M. , Karadzhov, T. , Georgiev, I., A NEW METHOD FOR CONTACTLESS MEASUREMENT OF SMALL MODULE GEARS WITH ASYMMETRIC PROFILE, Annals of DAAAM and Proceedings of the International DAAAM Symposium, 2023, 34(1), pp. 262–267 | | Издателство: | Annals of DAAAM and Proceedings of the International DAAAM Symposium | | Изд.год.: | 2023 | | Вид: | Научна публикация - Доклад от межд.конф. в чужбина | | Абстракт: | In the field of mechanical engineering, achieving precise measurements of small-module gears and transmissions is critical. This paper presents an innovative non-contact method for assessing the accuracy of these components, based on optic-electronic signal processing principles. It offers superior precision in evaluating gear geometry, pitch, and profile. With recent advancements in gear manufacturing, there is a growing need for efficient and precise measurement methods to ensure optimal performance and durability. Traditional tactile methods and double-flank inspections have limitations, including potential subjective errors. This paper addresses these challenges by providing a comprehensive solution that not only enhances measurement accuracy but also sheds light on the relationship between production variables and gear precision. This study is significant for delivering high-precision gear assessments, revealing production-precision links, reducing subjective errors, highlighting automation potential, and contributing to the discourse on mechanical precision in gear-dependent industries. Drawing from foundational research in gear measurement, optic-electronic signal processing, and manufacturing automation, its primary aim was to determine if non-contact methods improve small-module gear measurement. Through rigorous analysis, this study unequivocally affirms this question, advancing gear and transmission measurement and control. © 2023 Danube Adria Association for Automation and Manufacturing, DAAAM. All rights reserved. | | Web: | https://daaam.info/34th-proceedings-2023 | | Пълен текст: | Изтегли | |
| Публикация: №7 | Artiukh, S., Kokalarov, M., Kniazieva, V., Artiukh, A., Milchev, M., METROLOGICAL ASPECTS IN MAINTENANCE OF ENERGY-SAVING AUTOMATED SYSTEMS FOR CONTROL OF PUMP UNITS IN PUMPING STATIONS, Annals of DAAAM and Proceedings of the International DAAAM Symposium, 2023, 34(1), pp. 268-273 | | Издателство: | Annals of DAAAM and Proceedings of the International DAAAM Symposium | | Изд.год.: | 2023 | | Вид: | Научна публикация - Доклад от межд.конф. в чужбина | | Абстракт: | In the specialized realm of hydrocarbon transport engineering, this article presents a focused exploration into refining the current regulatory paradigms, with a cardinal objective: to enhance the operational efficacy of pumping units within oil pumping stations throughout their standard functional modalities. Historically, there exists a significant lacuna concerning comprehensive solutions capable of attenuating energy dissipation during oil conveyance and achieving benchmarked efficiency metrics intrinsic to oil pumping infrastructure. This pivotal matter, if addressed rigorously, stands to elevate both the technical and economic dimensions of primary oil conduits. The article's central aim, underpinning its entire analytical discourse, is to accentuate the energy efficiency of pumping units operational within oil transport hubs. To achieve this, the research introduces an avant-garde methodology primed for the calibration of pumps' dynamics and their associated network functionalities, optimizing their consumption paradigms in the process. Given the tangible fiscal constraints around the modernization of both primary and auxiliary equipment within oil pumping stations, there emerges an even more pressing impetus to amplify the paradigm of energy conservation. In a technologically progressive era where oil transport processes are rapidly automating, the development of automated energy-conservation-centric control systems is paramount. Such systems, by design, should ensure the reduction of energy losses, underscoring the article's overarching aim of bolstering energy efficiency within the hydrocarbon transportation sector. © 2023 Danube Adria Association for Automation and Manufacturing, DAAAM. All rights reserved. | | Web: | https://daaam.info/34th-proceedings-2023 | | Пълен текст: | Изтегли | |
| Публикация: №8 | Kniazieva, V., S. Artiukh, M. Kokalarov, Measurement of Psychophysiological Indicators in Order to Assess the Professional Qualities of Thermal Power Plants Operators, Sofia, Bulgaria, 2022, pp. 123 - 127. | | Издателство: | XXXII International Scientific Symposium Metrology and Metrology Assurance 2022 September 7-11, 2022, Sozopol, Bulgaria. Technical University of Sofia | | Изд.год.: | 2022 | | Вид: | Научна публикация - Доклад от межд. конф. в Б-я | | Абстракт: | The article takes into account the necessity to make a professional selection of candidates applying for thermal power plants operators, as being one of the key and priority components. A methodology for measuring the psychophysiological indicators as well as a forecast model regarding the group of professional suitability of thermal power plants operators is proposed. High accuracy of the forecast is expected due to the fact that the most informative psychophysiological indicators were determined in the process of measurement. | | Web: | http://www.metrology-bg.org/bg/home/ | | Пълен текст: | Изтегли | |
| Публикация: №9 | Sotirov, B., D. Tonev, S. Parvanov, M. Kokalarov, Determining the Geometrical Elements in the Photogrammetric Method for Measuring Linear Dimensions, Vienna, Austria, 2021, pp. 275 - 280, ISBN: 978-3-902734-33-4, ISSN: 1726-9679 | | Издателство: | Proceedings of the 32th DAAAM International Symposium, 2021 г., Vienna, Austria | | Изд.год.: | 2021 | | Вид: | Научна публикация - Доклад от межд.конф. в чужбина | | Абстракт: | This paper presents the specific characteristics of the photogrammetric measurement method applied in industry. The focus of the study are linear and angular dimensions of mechanical parts from heavy industry. The definitions of sizes to be determined using the photogrammetric measurement method are based on the international standards ISO 14405-1:2016 and ISO 286-1:2010 dealing with geometrical product specifications. The main objective is to define the algorithms for processing the results obtained by the photogrammetric method, and to use the method without the need of a specialized software which is costly and limits the applicability of the method in small and medium-sized companies. | | Web: | https://daaam.info/ | | Пълен текст: | Изтегли | |
| Публикация: №10 | Kokalarov, M., B. Sakakushev †, S. Parvanov, Generalized methodology for application of the photogrammetric method for measurement in heavy engineering, Sofia, Bulgaria, 2021 г., ISSN 2603-3194. | | Издателство: | Technical University of Sofia, Bulgaria, 31th INTERNATIONAL SCIENTIFIC SYMPOSIUM METROLOGY AND METROLOGY ASSURANCE 2021, September 7-11, 2021, Sozopol, Bulgaria | | Изд.год.: | 2021 | | Вид: | Научна публикация - Доклад от межд. конф. в Б-я | | Абстракт: | The article presentsthe possibility of using the photogrammetric method for control of dimensions and location in heavy engineering by applying a specificallydeveloped methodology for its application.A new methodology for application of this method for measuring large parts and structures in the field of heavy engineering is proposed. | | Web: | http://www.metrology-bg.org/bg/submission/ | | Пълен текст: | Изтегли | |
| Публикация: №11 | Gueorguiev, Tz., M. Kokalarov, B. Sakakushev †, Recent Trends in FMEA Methodology, Ruse, Bulgaria, 2020, pp. 1 - 4. | | Издателство: | 7th International Conference on Energy Efficiency and Agricultural Engineering (EE&AE), 12-14 November 2020, Ruse, Bulgaria | | Изд.год.: | 2020 | | Вид: | Научна публикация - Доклад от межд. конф. в Б-я | | Абстракт: | This paper intends to present the latest trends in
one of the most popular methods for risk analysis- the Failure
Mode and Effects Analysis (FMEA). The application of FMEA
in the automotive industry has been significantly modified in
the summer of 2019. This necessitates the elaboration of a
transition methodology supported by appropriate training and
practical implementation in industry. | | Web: | http://eeae-conf.uni-ruse.bg/ | | Пълен текст: | Изтегли | |
| Публикация: №12 | Kokalarov, M., B. Sakakushev, S. Parvanov, Improvement of Micrometer-normalmeter for Control of Gears in Heavy Engineering, Sofia, Bulgaria, 2020, pp. 23 - 26. ISSN 2603-3194. | | Издателство: | 30th INTERNATIONAL SCIENTIFIC SYMPOSIUM METROLOGY AND METROLOGY ASSURANCE 2020 September 7-11, 2020, Sozopol, Bulgaria, Technical University of Sofia, Prepress & Print SIMOLINI 94 Ltd. | | Изд.год.: | 2020 | | Вид: | Научна публикация - Доклад от межд. конф. в Б-я | | Абстракт: | The report discusses the measurement of the length of the total normal W by a specialized micrometer for measuring in the conditions of heavy engineering. The need for improvement of a specialized micrometric measuring instrument for W control is substantiated and the results of the empirical study are presented. | | Web: | http://metrology-bg.org/fulltextpapers/Proceedings_MMO_2020.pdf | | Пълен текст: | Изтегли | |
| Публикация: №13 | Kokalarov, M., Predetermination of the Uncertainty Budget and Error Analysis of the Photogrammetric Method in Heavy Machinery, Vienna, Austria, 2019, pp. 914 - 920. ISSN 1726-9679. | | Издателство: | Proceedings of the 30th DAAAM International Symposium, Published by DAAAM International, 2019, Vienna, Austria | | Изд.год.: | 2019 | | Вид: | Научна публикация - Доклад от межд.конф. в чужбина | | Абстракт: | The report examines the major sources of uncertainty in the Photogrammetric Measurement Method and their application
in heavy machinery using free software. This article aims to highlight the major differences between measurement error
and uncertainty, as well as to determine the true difference between the uncertainty budget using the photogrammetric
method of measurement in small and very small sizes (about and less than 2 mm) and these sizes that are widespread in
the heavy machinery industry. | | Web: | https://daaam.info/ | | Пълен текст: | Изтегли | |
| Публикация: №14 | Kokalarov, M., B. Sakakushev, S. Parvanov, Exploring the need for FMEA analysis in the choice of the Photogrammetric method for control and measurement in heavy machinery, Sofia, Bulgaria 2019, pp.119 - 123. | | Издателство: | XXIX International Scientific Symposium Metrology and Metrology Assurance 2019, Technical University of Sofia, Bulgaria | | Изд.год.: | 2019 | | Вид: | Научна публикация - Доклад от межд. конф. в Б-я | | Абстракт: | The article examines the feasibility of the application and the acute practical need to develop the FMEA (the analysis of the failures and their consequences), the choice of the photogrammetric method for technical control of the quality indicators, tolerances of the form, the position and the dimensions in the heavy machine building, dependence. | | Web: | http://www.metrology-bg.org/ | | Пълен текст: | Изтегли | |
| Публикация: №15 | Sakakushev, B., M. Kokalarov, S. Parvanov, PERSPECTIVES FOR THE APPLICATIONOF THE PHOTOGRAPMETRIC METHOD FOR LARGE-SCALEDETAILS AND STRUCTURES, Sofia, Bulgaria, 2018, pp. 23 - 26. | | Издателство: | 28th INTERNATIONAL SCIENTIFIC SYMPOSIUM METROLOGY AND METROLOGY ASSURANCE 2018 | | Изд.год.: | 2018 | | Вид: | Научна публикация - Доклад от межд. конф. в Б-я | | Абстракт: | This paper examines the practical applicability of the photogrammetric method for technical control of
the quality indicators, tolerances of form, location and dimensions in the heavy machine industry, using widespread
non-specialized software products. | | Web: | http://www.metrology-bg.org/bg/home/ | | Пълен текст: | Изтегли | |
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