GREGOR, L. Optimalizace konstrukce motocyklového rámu z kompozitních materiálů s ohledem na výrobní technologii [online]. Brno: Vysoké učení technické v Brně. Fakulta strojního inženýrství. 2025.
The dissertation by Ing. Lukáš Gregor presents a comprehensive and technically high-quality research focused on the design and optimisation of a motorcycle frame made of composite materials. The work was carried out within the framework of a research project in which Brno University of Technology was a co-investigator, and which was successfully defended. This fact confirms the relevance and contribution of the research not only to academia but also to industrial practice. Regarding the content and structure of the thesis: The thesis is clearly structured into ten chapters, which logically follow from the introduction through the literature review, experimental part, numerical analyses, to the conclusions. The author has demonstrated a deep understanding of composite materials, their mechanical properties, manufacturing technologies, and structural optimisation methods. The literature review is extensive, up-to-date, and includes both theoretical knowledge and practical applications. Regarding methodology and experimental part: The doctoral candidate chose a methodology that combines numerical simulations, topology optimisation, experimental measurements, and practical prototype manufacturing. A significant contribution is the validation of the material model using the ARAMIS DIC system, which demonstrates the author's multidisciplinary approach. Work with CAD systems, 3D scanning, fixture design, and part manufacturing including CNC programming, tool selection, and cutting conditions far exceeds standard engineering activities. Regarding results and contribution: The results are supported by both numerical simulations and experimental measurements. The optimised frame shows significant improvements in torsional, lateral), and longitudinal stiffness while simultaneously reducing weight. The work contributes to science particularly in the area of linking optimisation methods with real manufacturing technologies, which remains an underexplored topic in composite structure design. Regarding independence and professional level: The author has demonstrated a high degree of independence, technical proficiency, and the ability to connect theoretical knowledge with practical implementation. He designed, manufactured, and tested most of the components himself, which proves his ability to lead a complex technical project. The thesis is written in professional language, stylistically refined, and in English, which increases its international applicability. Regarding publication activity: The author has published the results of his work in several peer-reviewed journals indexed in WoS and Scopus and actively participated in international conferences. This publication activity confirms the scientific relevance of the work. Conclusion: The dissertation by Ing. Lukáš Gregor meets the requirements for a doctoral thesis both in terms of professional and formal aspects. The author has demonstrated the ability to conduct independent scientific research, a multidisciplinary approach, and high technical expertise. The work has significant contributions to both science and practice. Recommendation: Based on the above, I recommend the dissertation by Ing. Lukáš Gregor for defense and propose the awarding of the academic degree “Doctor” (Ph.D.).
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