BERUASHVILI, V. Topologická optimalizace závěsu na poddajném podkladu [online]. Brno: Vysoké učení technické v Brně. Fakulta strojního inženýrství. 2020.

Posudek vedoucího

Löffelmann, František

Topic of the theses is related to previous study of the hinge design done in cooperation with industrial partner. This thesis focused more on optimization of the design closer to the original component, so that final result can simply replace the old one. Student consulted intensively in the last month. Optimization was done in several variants which could be arranged better, e.g. showing more cases of mass constraints. Results from several optimization variants were manually combined to the final design, but the process of geometry finalization is not described in detail so that reader don’t see if the component could be further improved or not. Text contains several typographical and stylistic errors and some explanations could be arranged better, e.g. introduction could have subtitles for the given task, manufacturing, and optimization. From the larger perspective, student proved ability to accomplish optimization task of the real component and interpret results on good level.

Posudek oponenta

Symonov, Volodymyr

The goals declared in the specification of the thesis are achieved in general. The work extent corresponds to the requirements. However, the thesis has disadvantages, which should be highlighted: 1. The English and the quality of the work formatting are poor. 2. The figures and their captions do not define the shown objects clearly enough. In some cases one have to guess what the author wanted to show. 3. The introduction contains too much information, which describes in detail what is topological optimization, also what kind of manufacturing methods exist for complex structures (different types of 3D printing and CNC milling). 4. However, the part being optimized is not complex, the FE model is described in too considerable detail. 5. The material used for the FE model creation is defined at the end of the thesis. In the beginning hypothetical properties are defined only (modulus of elasticity and Poisson’s coefficient). At the same time some stress limits are used as constrains of optimization, however the chosen limit stress values are not explained. 6. At the end of the thesis, based on the maximum stress occurred, a particular material is defined (aluminium alloy 7075), however its treatment is not specified and its properties are not listed anywhere after. 7. It is not clear, what kind of material is used for the optimized part strength check. 8. It is not clear, which material exactly was used for the flexible basement. 9. It is not clear, why it is declared in the introduction (see p. 12, the last paragraph) several types of 3D printing technologies would be considered. In fact, further the author consider only CNC technology and 3D printing without saying about any specific type of these technologies, what is logically within the defined goals. 10. The chosen optimization domain is limited by the initial part outer profile and its maximum thickness, however such a choice limits the optimization too much. It is better limiting the domain by the tangents to the outer surfaces near the holes, excluding the material around these holes. 11. It is not clear why the brackets and material near the holes are included into the optimization domain, while the author says the customer requires not to change the brackets design and position. Moreover, the geometry around the holes is almost fixed, because of the joints strength. 12. On the p. 51 the author takes as the maximum stress the one, which occur on the inner surface of one of the attaching holes. It is not correct, because the joint is modelled by RBE2 element, which cannot model the real stress distribution around a hole. 13. At the end of the thesis the general conclusions about the chosen optimization method and procedure are made, what is self-evident. The student should have made particular conclusions about outputs of his work in relation to the defined goals instead. Finally, it could be concluded the student in general has required skills for performing such a task. The methods and procedure are chosen and applied correctly. The student showed understanding of the topic, however some incomprehension in particularities can be seen. Also inattention and chaotic character in some extent could be felt while reading the thesis.

eVSKP id 125360