| 1. |
- Angelov, B., et al.
(författare)
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An integrated model for designing of technical systems : Another step to coherence between theory and practice
- 2020
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Ingår i: IOP Conference Series. - : Institute of Physics Publishing (IOPP).
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Konferensbidrag (refereegranskat)abstract
- A number of authors recommend selecting the systems design methods to be used depending on the practical tasks to be solved. At the same time, results of studies aiming at clarifying and systematizing practical tasks are very rare. In the frames of the research performed, it was revealed that in the companies four major tasks use to be solved - adapting an existing solution to work in new conditions, refining an existing solution, combining it with previously developed elements and creating a new solution. Resultantly, in the research an integrated model for design of technical systems was proposed. This model was obtained by combining (overlaying) the methods for solving the four main tasks defined and subsequently the content of the different stages in the proposed model was clarified. © Published under licence by IOP Publishing Ltd.
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| 2. |
- Angelov, Borislav, et al.
(författare)
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An integrated model of technical system design : Further development of the concept
- 2021
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Ingår i: AIP Conference Proceedings. - : American Institute of Physics (AIP). - 9780735441408
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Konferensbidrag (refereegranskat)abstract
- As a result of the research performed earlier, it was found that the development of technical systems in practice solves four major tasks-adapting an existing solution to work in new conditions, refining an existing solution, combining it with previously developed elements and creating a new solution. Accordingly, the principal focus of the present research is on a more integrated model for the design of technical systems. The model is obtained by combining (overlaying) the methods for solving the four main tasks defined. The current study presents the findings from the subsequent development of the concept-the place of the scientific research in the proposed integrated model is determined and the process of selecting or synthesizing a technical proposal in each of the defined four cases is clarified.
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| 3. |
- Angelov, Borislav, et al.
(författare)
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The system for the conversion of matter, energy and information : the missing element in the theory of technical systems
- 2012
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Ingår i: The Seventh International Symposium KOD 2012 Machine and Industrial Design in Mechanical Engineering Proceedings. - Novi Sad : Faculty of Technical Sciences. - 9788678923999 ; , s. 65-70
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Konferensbidrag (refereegranskat)abstract
- The last years of the past century were characterized by the rapid development of engineering. Technical sciences have also made their evolutionary leap. What is still missing is a generally accepted scientific subject that systematizes the existing knowledge in one scientific complex, based on the general principles in the structure, design and use of the technical systems. The paper presents results from the analysis of the object of the study and the contents of a general science of the technical systems.
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| 4. |
- Bagni, T., et al.
(författare)
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Modeling Results of the Quench Behavior of a Nb-Ti Canted-Cosine-Theta Corrector Magnet for LHC
- 2024
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Ingår i: IEEE transactions on applied superconductivity (Print). - : IEEE. - 1051-8223 .- 1558-2515. ; 34:5
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Tidskriftsartikel (refereegranskat)abstract
- A newly designed superconducting magnet of the Canted-Cosine-Theta (CCT) type was developed as a result of a collaboration between Swedish universities (Uppsala and Linneaus) and Swedish industries. This magnet was designed to function as a replacement of the present LHC orbit corrector magnets, which are approaching their end of life due to the radiation load. As a result, the new CCT magnet was developed to be more radiation tolerant and to constitute a one-to-one replacement to the currently installed version, which is a 1 m long 70 mm double aperture dipole magnet. The final magnet, which is currently under construction, will be tested at FREIA laboratory at Uppsala University and generate a magnetic field of 3.3 T and an integrated field of 2.8 Tm at about 85 A. To examine the magnet quench behavior and to identify a suitable quench protection system, the 3D electro-magnetic and thermal behavior of the coil was modeled using the RAT-Raccoon software. Based on the simulation results, a Metrosil varistor was selected to protect the magnet during the test. In this article, we report the results of the numerical analysis. The magnet model is equipped with a spot heater to initialize the quench and the temperature and voltages are monitored during the avalanche effect. The simulated current decay and the hot-spot temperature are analyzed with a focus on the impact of quench-back on the magnet protection.
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| 5. |
- Dobreva, Antoaneta, et al.
(författare)
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Measuring and Evaluation in Machine Science and Design Education, based upon Diagnostic Research
- 2013
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Ingår i: Procedia Social and Behavioral Science. - Brussels : Elsevier BV. - 1877-0428. ; , s. 1190-1194
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Konferensbidrag (refereegranskat)abstract
- The interests and expectations of the students at Ruse University, Bulgaria in the area of Machine Science and Design are important for the lecturers delivering those subjects. The problem statement is connected with the identification of the challenges for academic staff. The purpose of the study is to improve the quality of education by analyzing the students’ assessment of the study process. Empirical and theoretical methods are used during the research. A method of inquiry based upon online assessment and a diagnostic method are introduced. The results are processed automatically. The results obtained are summarized and critically analyzed.
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| 6. |
- Dobreva, Antoaneta, et al.
(författare)
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Theoretical research of dynamic loading of cardan drive shafts with computer modeling and applications
- 2012
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Ingår i: International Conference onInformation Technologies (InfoTech-2012) 26th issue. - Sofia : Publishing House of Technical University. ; , s. 98-105
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Konferensbidrag (refereegranskat)abstract
- The paper justifies the necessity to analyze and precise the methodology ofcalculation of such drive shafts, which are important components in the complicateddriveline of automobiles and heavy vehicles. Based upon the elaborated threedimensional models, an innovative approach is developed and applied by the authors’team. Through the developed model based upon Simulink the variation of dynamicloading of the intermediate shaft of cardan drives has been investigated. Results fromcomputer simulation are shown and discussed. The presented approach for precisecalculating and design of drive shafts is aiming to improve the quality of theengineering design activities.
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| 7. |
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| 8. |
- Haralanova, Valentina, et al.
(författare)
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Challenges in Training on Engineering Graphics - Experiences from Two European Universities
- 2018
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Ingår i: EDULEARN18. - : The International Academy of Technology, Education and Development. - 9788409027095 ; , s. 7502-7512
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Konferensbidrag (refereegranskat)abstract
- In the presented publication the authors reflect on their long-term teaching experiences in the field of Applied geometry and Engineering graphics accumulated at two European universities - Ruse University, Bulgaria and Linnaeus University, Sweden. The main problems and challenges in the training of students of the engineering specialties of the two universities in disciplines related to descriptive geometry, technical drawing, engineering graphics and 2D and 3D CAD, are related to an establishment of practical skills for execution of different types of drawings, to the building up a spatial vision for faster and more efficient reading and implementing of drawings and an accumulation of sufficient knowledge and information on the current standards in the field of engineering graphics and technical documentation. Graphics and visualization are a preferred form of communication in engineering practices and engineering education. Various methods of descriptive geometry and computer graphics are applied in order to achieve an effective visualization. By using technical standards for defining the practical usage of symbols, graphical elements and units of measurement, a visual language is created that assists and ensures a transmission of unambiguous, clear and understandable information. The publication presents a review of approaches and training methods applied at both universities over the past 10 years, and a comparison of the results achieved. Finally, conclusions are drawn, how having in consideration others and their own experiences and taking into account some recent trends in the work of designers, developers and technologists, the students' learning outcomes of in their preparation for future engineers could be improved.
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| 9. |
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| 10. |
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| 11. |
- Haralanova, Valentina, et al.
(författare)
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Developing a bicycle example as support for teaching product development in higher education
- 2014
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Ingår i: INTED2014. - : The International Academy of Technology, Education and Development. - 9788461684120 ; , s. 198-207
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Konferensbidrag (refereegranskat)abstract
- Based on previous experiences, making the subject Product Development understandable for the students' needs more and clear examples. In this case, it is easier for the students to understand if the products selected as examples are familiar to them. The idea was to make the students take the roles of design engineers, costumers, and users of the product which would be developed. That is the reason to select a student bicycle as example. A questionnaire, which was prepared and sent to students in different European countries, was used to collect the voice of the customer. Based on the gathered information, the process of product development was applied to achieve a conceptual design based on customers' requirements. This paper is presenting how a student bicycle example was developed and used in a product development course. In the preparation of the example two final year students were involved in cooperation with the authors of this paper. The result from this work was improved and modified by the authors to be suitable as a teaching example.
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| 12. |
- Haralanova, Valentina, et al.
(författare)
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Development of an automated system for assembling cold pressed segments : industrial application of a degree project
- 2015
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Ingår i: Proceedings of Trc-IFToMM Symposium on Theory of Machines and Mechanisms. - : Turkish Machine Theory Association. - 9786058422001 ; , s. 356-362
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Konferensbidrag (refereegranskat)abstract
- In this paper a successful final project work, done at Linnaeus University (LNU), is presented as a result of cooperation between the company and the students group, which will find its industrial application in making the production process of the company more efficient. In the presented paper the emphasis is on the process followed during the design project and on the continuous and fruitful cooperation between the company providing the project, the student´s design team and the University itself.
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| 13. |
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| 14. |
- Haralanova, Valentina, et al.
(författare)
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Failures in gearboxes due to material problems
- 2016
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Ingår i: Materials, Methods & Technologies. - 1314-7269. ; 10, s. 112-136
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Tidskriftsartikel (refereegranskat)abstract
- Mechanical failures in general can appear because of weak design, wrong handling, and problems during the manufacturing process, material problems etc. This paper is dealing with failures in lifting machinery gearboxes which appear because of material stresses and tribological problems. The study conducted is based on theoretical analysis and analysis of inspection results for failures that have appeared in cranes and other lifting machinery in southern part of Sweden. Investigation shows that besides the surface damages like abrasive and adhesive failures also cracks in the material in different parts appear. Since these types of gearboxes are made in short series, gearbox housings and sometimes also gears are made of welded steel. Hence welding process makes the weld joints brittle; cracks do start and developed until the part fails. Another problem that happens due to welding is wrapping which leads to changes in the geometrical tolerances and that does affect the parallelism of the shafts and the functionality of the gearbox.
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| 15. |
- Haralanova, Valentina, et al.
(författare)
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Generalized algorithm for a functional : structural analysis of technical systems
- 2012
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Ingår i: The Seventh International Symposium KOD 2012 Machine and Industrial Design in Mechanical Engineering PROCEEDINGS. - Novi Sad. - 9788678923999 ; , s. 71-74
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Konferensbidrag (refereegranskat)abstract
- A generalized algorithm for functionalstructural analysis of the technical systems based on the hierarchical relationship between the system for conversion of material, energy and information, the technical system and the executive organs of the technical system, is proposed. The universality of the proposed algorithm is a prerequisite for solving important problems in the theory of the technical systems for revealing regularities, generally valid for all technical objects and transferring knowledge from one scientific field to another one.
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| 16. |
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| 17. |
- Haralanova, Valentina, et al.
(författare)
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Re-designing of a product development course for mechanical engineering students by shifting responsibilities to them
- 2017
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Ingår i: INTED2017. - : IATED-INT ASSOC TECHNOLOGY EDUCATION & DEVELOPMENT. - 9788461784912 ; , s. 5991-5999
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Konferensbidrag (refereegranskat)abstract
- Market needs and customer expectations on new products grow continuously, which increases the requirements on the product engineers and designers. Respectively, is becomes real challenge to educate engineering students theoretically by studding contemporary methods and techniques in design and practically mastering skills in multi-disciplinary product development process. The presented paper is meant to introduce an experiment in teaching Product development course for Mechanical engineering students at Linnaeus University (LNU). After teaching the course in several years we experience that, teaching creativity, critical thinking and decision making by presenting different tools and techniques, could be hard to make it inspiring enough for the students. During the fall semester of 2014 a decision was taken to re-design the course by shifting some of the activities and responsibilities from the teacher to the students. They were involved in delivering and clarifying the theory by summarizing the lectures. Students have an active role in working on industrial projects and presenting the results achieved. The individual apprizing based on the group members contribution was also a students' responsibility. There were benefits but also some problems which will be discussed in this paper. The conclusion made after this experiment reflected in the course planning for the next years.
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| 18. |
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| 19. |
- Haralanova, Valentina, et al.
(författare)
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Regular Student Feedback Concerning Education Quality : Good Practice To Follow
- 2014
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Ingår i: Balkan Region Conference on Engineering and Business Education. - : Walter de Gruyter GmbH. - 1843-6730. ; , s. 425-430
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Konferensbidrag (refereegranskat)abstract
- This paper presents some of the experience of two European Universities concerning regular student feedback in the area of higher education quality, which is implemented at the end of every course of a particular subject. It also presents a comparison between survey questionnaires at Linnaeus University, Sweden in Machine Design courses, at the Mechanical Engineering Department, where such feedback has been applied during the last fifteen years, and the existing experience in the same field at the Department of Machine Sciences, Machine Elements, and Engineering Graphics at the University of Ruse, Bulgaria. Conclusions are made on the necessity of providing students with regular opportunity to take part in quality management in higher education.
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| 20. |
- Haralanova, Valentina, et al.
(författare)
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Teaching standards in higher engineering education : necessity, objectives and approaches
- 2014
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Ingår i: Acta Technica Corviniensis. - Rumenia. - 2067-3809. ; VII, s. 45-50
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Tidskriftsartikel (refereegranskat)abstract
- Abstract: In the presented report, through in-depth study of international researches, the importance of standards in all areas of life and pressing need to deepen the study of standards in the higher engineering education has been reasoned. Results of a questionnaire survey have been stooped, with respondents - engineering students, confirming their awareness that enhanced study in the field of standardization is needed. Education about standards and up to date information about them is condition for improving the quality and effectiveness of their study. The authors propose a comprehensive approach to education about standards, which includes complementing of the curriculum of technical subjects and creation of new discipline that studies standards used in the particular specialty and those found in everyday life. Positive contribution to the creation of good qualified engineers has access to updated information about standards, which would be achieved through the establishment of an Information Centre at campus in constant contact with Standardization Institute.
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| 21. |
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| 22. |
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| 23. |
- Haralanova, Valentina, et al.
(författare)
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Visualization in the teaching process of fundamental engineering subjects
- 2012
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Ingår i: Science & Technologies. - St. Zagora, Bulgaria. - 1314-4111. ; II:4, s. 109-113
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Tidskriftsartikel (refereegranskat)abstract
- Graphics and visualization are preferred forms of communication in engineering practice and engineering education. In visualization there are different methods of descriptive geometry and computer graphics. The presentation of the teaching material by visualization contributes to a quick and easy acceptance by students, helps to create spatial vision.
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| 24. |
- Kans, Mirka, et al.
(författare)
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Interdisciplinary, International and Industial Cooperation Efforts within the Mechanical Engineering Department
- 2014
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Ingår i: Proceeding of the 10th international CDIO Conference. - : CDIO. - 9788469721476 - 846972147X
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Konferensbidrag (refereegranskat)abstract
- Cooperation is a multi-faceted concept in higher education. It could denote the cooperation between industry and academia, enabling students to train problem solving in a real life context. It could also describe the internationalization efforts found in teachers’ and students’ exchange programs. Moreover, cooperation exists between disciplines in order to enable a holistic perspective on course contents. This paper describes experiences of teaching some courses where all these aspects of cooperation are utilized for reaching the best possible conditions for teaching. The courses are within Machine Design, Product Development, Project Management, and Degree Project, and are all taught in English and contain projects in cooperation with industries. These courses are dealing with different approaches to the industrial projects to give the students an overall view and understanding of the real engineering work. The practical work is in form of student driven industrial projects, where students from the Mechanical Engineering Department at Linnaeus University collaborate with international students. The industrial related projects results in valuable real life experiences. The background of students from different countries and experiences of international teachers enriches the teaching process and students’ teamwork activities. Another result is the valuable culture exchange between the students and teachers which gives skills for future engineers to work in the European or global labor market. The implementation of the courses is described with focus on how cooperation between industry and academia, as well as between different competences at Linnaeus University and the University of Rousse, Bulgaria are utilized for creating optimal learning conditions.
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| 25. |
- Khoshaba, Samir, et al.
(författare)
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Challenges in teaching product development using industrial projects-experiences from Linnaeus university
- 2013
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Ingår i: 7TH INTERNATIONAL TECHNOLOGY, EDUCATION AND DEVELOPMENT CONFERENCE (INTED2013). - : The International Academy of Technology, Education and Development. - 9788461626618 ; , s. 4659-4667
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Konferensbidrag (refereegranskat)abstract
- In the presented paper the authors expose their experience with caring out a course "Systematic Approach" to the "Product Development", at Linnaeus University, Sweden. Product Development is a process based on a number of techniques and methods applied in correct order to achieve the best result in design and innovation tasks. For successful product development in a present competitive market interdisciplinary different types of skills are required. The mission of the course is to prepare future leaders in new products' engineering and management. Teaching such abstract subject, where at every step decision making in aesthetic, engineering and economic issues is required, is a real challenge for the course instructors. The fundament in this course is industrial projects, about real products. The participating students must understand the theory given in the lectures at the same time as they have to manage to apply it in development of different type of products. Students from different backgrounds like Mechanical Engineering and Business Engineering programs, and exchange students from eight different countries were participating in the course. They were divided in missed groups of four people in each group. Every three groups were competed each other through solving the same problem. The projects finished with concept designs, based on identified customer needs, concept generation, developed product architecture, and project management.
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| 26. |
- Khoshaba, Samir, et al.
(författare)
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Planning, accomplishing, and examining of an industrial project-based course within the field of product development
- 2014
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Ingår i: INTED2014. - : The International Academy of Technology, Education and Development. - 9788461684120 ; , s. 189-197
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Konferensbidrag (refereegranskat)abstract
- Participating in product development course requires not only learning the theory delivered in the lectures but also learn how to combine the knowledge developed in previous courses with the systematic way of thinking in order to take right design decisions. This aim is achieved in a best way, if the educational process is accomplished in cooperation with the industry. Organization of a course based on industrial projects is not an easy task. The most difficult issues are to find suitable projects for the topic, adequate for the size of the course, and to fit to the background of the students. Before starting such course, it needs huge efforts to plan and prepare right proportions of theories, examples, seminars, and project group consultations. Although everything would be planned and scheduled in details, many problems may show up during running the course. The problems can be conflicts and miscommunications within the groups, and/or miscommunications between student groups and companies or teachers. The mixture of program-and international students with different cultural-and educational background does not always make the situation easier. The fair assessment for individual students needs different approaches from the teachers' side when the examinations of the projects are based on the reports prepared by groups. This paper is presenting experiences from teaching a project-based Product Development course with real projects from the industry. The course is given in English for program-and international students.
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| 27. |
- Khoshaba, Samir, et al.
(författare)
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Teaching design of mechanical transmissions in an international classroom - experiences and reflections
- 2017
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Ingår i: INTED2017. - : IATED-INT ASSOC TECHNOLOGY EDUCATION & DEVELOPMENT. - 9788461784912 ; , s. 6007-6016
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Konferensbidrag (refereegranskat)abstract
- The topic of mechanical transmission design is one of the fundamental parts in the subject of machine design, and it is taught almost in all the mechanical engineering programs around the world. The fundamentals are the same but the teaching methods, literature and the instruction language are different from country to country, and from university to university. Although the bachelor program in mechanical engineering at Linnaeus University (LNU), Sweden is taught in Swedish, there are some courses given in English language both for the program-and international students. The international students are usually exchange-or free movers staying at LNU for one semester or for a whole academic year. The English courses are usually in the final year of the program, which means almost all international students have different background, skills and knowledge. The mix of program students and students from different countries in an international classroom is an excellent opportunity to gain international experiences but it is also a real challenge both for teachers and student groups. This paper is presenting many years experiences and result from teaching machine transmission design though project based learning for classes mixed of program-and international students at Linnaeus University in Sweden.
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| 28. |
- Pepitone, K., et al.
(författare)
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Design and Fabrication of a Canted-Cosine-Theta Double Aperture Orbit Corrector Dipole for the LHC
- 2023
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Ingår i: IEEE transactions on applied superconductivity (Print). - : IEEE. - 1051-8223 .- 1558-2515 .- 2378-7074. ; 33:5
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Tidskriftsartikel (refereegranskat)abstract
- A prototype CCT dipole magnet developed by a collaboration between Swedish universities, Swedish industry and CERN will be tested at Uppsala University. This 1 m long double-aperture magnet can provide a field strength of 3.3 T at 85 A in a 70 mm aperture with an integrated field of 2.8 Tm. It is intended to replace the current LHC orbit corrector magnets which are reaching the end of their expected life due to the radiation load. The new magnet is designed to handle the radiation dose of the upgrade to the high-luminosity LHC, which will deliver about ten times the current radiation dose. It must therefore be more resistant to radiation and meet strict requirements in terms of electrical insulation while matching the original field quality and self-protective capability, mechanical volume, and maximum excitation current. This paper will present the latest of the design and manufacturing work, including the results of simulations of the mechanical field and the mechanical stress. Details of the various tests performed before machining the parts are also presented.
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| 29. |
- Ronkova, Viarka, et al.
(författare)
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Standards and their Place in the Learning Process of Engineering Education
- 2012
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Ingår i: Science & Technologies. - St.Zagora, Bulgaria. - 1314-4111. ; II:4, s. 114-118
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Tidskriftsartikel (refereegranskat)abstract
- The increasing globalization requires common standards at EU-level and global level. Socio-economic impact of standardization has been widely recognized by the rapid development of global trade, regional integration, multilateral and bilateral agreements and the application of ICT. Due to the specifics of engineering education, where each element of the curriculum is linked with standardization, it is imperative that access to this information has to be presented to students to be aware of how to use and apply standards.
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