Viktor Ivanov
@opu.ua
Mechanical engineering and machine elements
Odessa National Polytechnic University
EDUCATION
PhD "Mechanical engineering and machine elements"
Doctor of science "Project management"
RESEARCH INTERESTS
Heuristics method in engineering, project management and education
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Viktor Ivanov, Lubomir Dimitrov, Svitlana Ivanova, and Mariia Volkova
Springer Nature Switzerland
Svitlana Ivanova, Lubomir Dimitrov, Viktor Ivanov, Galyna Urum, and Olena Olefir
Springer Nature Switzerland
Svitlana Ivanova, Lubomir Dimitrov, Viktor Ivanov, Anatolii Konoplov, and Natalia Cheredarchuk
Springer Nature Switzerland
Viktor Ivanov, Liubov Bovnegra, Svitlana Ivanova, Galyna Naleva, and Olha Kononova
Springer International Publishing
V. Ivanov, S. Ivanova, A. Niedzwiecki, and M. Rath
New Century Health Publishers LLC
Atherosclerotic cardiovascular disease is accompanied by changes in arterial connective tissue. We evaluated the effects of fat-soluble vitamins A, D, and E individually and in combinations on the composition of extracellular matrix produced and deposited by arterial wall cells, human aortic smooth muscle cells, and endothelial cells. Individually, vitamins D and E stimulated collagen type I extracellular matrix deposition in human aortic smooth muscle cell cultures. However, vitamins A, D, and E reduced collagen type IV deposition by human aortic smooth muscle cell, counteracting the stimulatory effects of vitamin C. The extracellular matrix deposition of heparan sulfate by human aortic smooth muscle cells increased by vitamin C and its combination (C+D+E). β-carotene + D + C induced the extracellular matrix deposition of collagen I by endothelial cells. Vitamin E with other vitamins resulted in either induction (E+C+A) or inhibition (E+D). The extracellular matrix deposition of type IV collagen and elastin by human aortic endothelial cells was not affected by test vitamins, except the extracellular matrix type IV collagen decrease by combinations (A+E), (A+D+E), and (C+D+E). The extracellular matrix deposition of all tested glycosaminoglycans was reduced by vitamin A and its combination (A+C+D+E). Therefore, the fat-soluble vitamins applied individually or in combination—both with each other or with ascorbic acid—can affect extracellular matrix deposition of type I and IV collagens, and key glycosaminoglycans by cultured human aortic arterial wall cells.
Viktor Ivanov, Lubomir Dimitrov, Svitlana Ivanova, and Mariia Volkova
Springer International Publishing
The analysis of the concepts used for engineering analysis of existing product samples is given: Remanufacturing, Repair, Reverse engineering, Redesign, Repurposing. In all cases, there is a decryption phase consisting analysis of technical state and identification. The identification involves the analysis of a design, the identification of units that make it up, the definition of technical specifications and the complete reproduction a technical documentation of existing product. The analysis of the technical condition and identification are presented using the approaches of the pattern recognition process. The problem of further use of the product after identifying the causes of destruction and studying the design and functionality is presented as the process of recognizing the project type: Repair, Redesign, Repurposing, etc. The developed approach was used to analyze the technical state and identification the transmission parameters. The design structure matrix and the morphological map of damage were used to determine the root causes of the transmission failure and the damage scenario.
Viktor Ivanov, Svitlana Ivanova, Galyna Urum, and Dmytro Purich
Springer International Publishing
The experiment was carried out on a setup that allows you to change the position of the bevel gear axes. Spur bevel gears were made of Plexiglas. The contact area along the face width of the teeth is determined based on optical measurements with a microscope. The load distribution along the face width based on the contact area of each tooth part is defined. The research was carried out in accordance with the theory of the design of experiments. The combination of mounting errors was set in accordance with the Hartley’s experiment plan for forth input factors. The dependence of the load distribution factor on mounting errors has been established. The method of transferring data obtained on Plexiglas models for steel gears is indicated. This method is based on the use of similarity theory.
Viktor Ivanov, Lubomir Dimitrov, Svitlana Ivanova, and Olena Olefir
ASTES Journal
Svitlana Ivanova, Lubomir Dimitrov, Viktor Ivanov, and Svitlana Scvorcova
IEEE
In the paper presented the method of brainstorming with some examples is presented and the main requirements to the moderator, discussion participants and critics have been analyzed. The correspondence between the performing roles of the participants in the brainstorming session and the team roles of Belbin was determined. The procedure of brainstorming session with participants who are ideally suited for Belbin's team roles is described. An experiment was carried out with students performing a course project on machine elements using the developed method. The experiment showed the greater efficiency of the project teams, formed in accordance with the Belbin methodology and performing brainstorming in accordance with the developed recommendations.
Viktor Ivanov, Galyna Urum, and Svitlana Ivanova
Springer International Publishing
Spur bevel gears are characterized by a load concentration at the ends of the teeth, where gear teeth are at their weakest. To reduce load concentration at the ends of the teeth, the modification is used by longitudinal crowning of a flank profile. The crowning contact in a spur bevel gear can be achieved through deliberately introduced mounting errors. With a deviation of the shaft angle along with the deviation mounting distance, it is possible to achieve initial contact in the middle of gear tooth surfaces. The problem of the theory of gearing is solved - dependencies are obtained to determine the initial contactpoint of the teeth. For this, the intersection line of an octoid surface of the tooth and a plane of gearing was found, in the presence of mounting errors. The trajectory of the contact point on the surface of the teeth during mating was determined. The maximum achievable contact crowning values are given depending on the degree of transmission accuracy and the total number of teeth. Crowning is calculated for the range of modules 6.3… 10. A fixture design for controlling axial displacement during gear assembly has been developed.
Svitlana Ivanova, Lubomir Dimitrov, Viktor Ivanov, and Galyna Naleva
IEEE
An experiment was conducted to check the relationship between the results of the project team work and the selection of team members that takes into account personality types of students. In the first kind of project team there were participants without special advance preparation. The second and third kinds of project teams were going through special trainings in creativity enhancement method. In addition, a third kind of project teams composed of the participants according to their personality types. The experiment showed that the third kind of project teams coped with tasks much better than other groups.
Viktor Ivanov, Lubomir Dimitrov, Svitlana Ivanova, and Olena Olefir
IEEE
Personal types of students were determined in accordance with the Myers-Briggs typology. It is established that the dominant types of students - prospective teachers of Maths - basically correspond to the dominant types of students studying a science, mathematics, engineering and technology. The effectiveness of the heuristic method largely depends on the selection of students for the project team and the distribution of roles within the team in accordance with the personality type of students. Creativity enhancement method united the Myers-Briggs typology and heuristic methods are developed.
Viktor Ivanov, Galyna Urum, Svitlana Ivanova, and Mariia Volkova
Private Company Technology Center
Various designs of CVTs were explored from two points of view: analysis of the design itself and analysis of the methods and techniques, used in the process of creation of the CVT. To solve the problem of finding new designs of mechanisms, the graph transformation method was developed. It includes the following heuristic techniques: a decrease in the number of graph nodes at simplification of a design or to remove non-essential elements; a change in location of graph edges and comparison of a new location of edges and necessary changes in a design; a search for all possible options for location of the parts that correspond to the same graph; introduction to the graph of the nodes, corresponding to the property, for implementation of which a part (a node) can be added to a design or, vice versa, can be removed from a design, and the property it implemented will be implemented by other parts. The original design of the CVT, in which load is transmitted by gear engagement without using friction disks and flexible sections, was developed. A continuously variable of transition ratio is ensured by a gear wheel with a variable pitch. The gear wheel consists of three gear sectors, two of which are involved in meshing. The third unloaded sector performs a turn with angular velocity that is higher than velocity of rotation of the output shaft until it takes a position before coming into engagement. The CVT does not have such drawback as fluctuations of transmission ratio. Based on the analysis of the bond-graphs, efficiency was determined, which depending on velocity of the output shaft is in the range of 95…97 %. The disadvantage of the developed design is an insufficiently wide gear ratio range R=1.5…1.6, which is limited by transverse contact ratio e α
Viktor Ivanov, Galyna Urum, Svitlana Ivanova, and Galyna Naleva
Private Company Technology Center
The application of heuristic methods in the design of transmissions is investigated. The entire path that the designer passes from the development of the design requirements, then the preliminary design and finally the development of the detailed design is considered. Heuristic methods are divided into three groups according to three design phases. For each phase, one generalized heuristic method that includes all heuristic techniques of the known methods referred to a particular group should be used when designing transmissions. Special attention is paid to the methods that use matrix and graph models. These methods are the most suitable for analyzing complex technical objects. Search for design features that are not used in right-angle gearboxes is performed by the method of creativity enhancement. Using the method of studying the structure of the problem based on the use of matrix and graph models at the phase of preliminary design, it was found that the power split in the bevel stage is possible at an angle between the axes of the bevel gear not equal to 90°. A comparative analysis of the found design with the existing gearbox at the phase of detailed design using the method of evaluating the variants for a design solution is made. Evidence of the effectiveness of heuristic methods is the development of a new gearbox design with better technical characteristics: smaller weight and dimensions. The developed heuristic methods are aimed at solving the tasks of designing transmissions; they can be used by designers, inventors and are interesting for experts in the field of heuristics.