DEY, A. Konstrukce brzdového systému kultivátoru [online]. Brno: Vysoké učení technické v Brně. Fakulta strojního inženýrství. 2023.

Posudek vedoucího

Zeizinger, Lukáš

The document mentioned consists of several chapters related to trailer braking systems. The first two chapters provide a summary of information regarding the trailer. The third chapter focuses on describing the basic types of braking systems. In the fourth chapter, the author explains the fundamental functionality of braking systems and provides a technical description.The fifth and sixth chapters specifically address the basic frame of the trailer and the technical details of the drum brake. The seventh chapter includes a detailed calculation of trailer brakes. Towards the end of the document, the author describes the Finite Element Method (FEM) simulation of the frame and axle, with a focus on optimizing the frame to reduce stress peaks.The calculation documentation is correct within the diploma thesis and is documented to the required extent. Additionally, the text mentions some minor shortcomings in the work: - small size of images 1.1, 1.2, - a mix of imperial and metric units in Chapter 2, - readability issues with certain figures 3.3, 4.2, - blank page 20, 61, - incomplete description of figure 6.1 (a) and (b), - redundant linearization of formulas. Despite these minor formal deficiencies, the overall level of the submitted work is considered sufficient and aligned with the assignment. The author, Mr. BEng. Arpan Dey, M.Sc., demonstrates adequate experience and knowledge in the field, showcasing the ability to work independently in the future. The thesis is recommended for defense.

Posudek oponenta

Kříž, Jakub

Level of diploma theses is on low level, as major issue connected with overall clasification is missing one of four determined goals of this theses. „Drawing documentation of main parts of production units“ is non existing. More than half of theses is research character which is unnecessary and serves as filling where long segments repeating itself fells exhaustingly. Independent addition from student side starts with chapter 7 from 10 of total. All used boundary conditions have no citation or any other proof. As example 10 000[kg] of load on cultivator, where on the other hand cultivator own weight is never mentioned nor calculated. Defined speed of 40[km/h] is law restricted but modern tractors can reach speeds 65+[km/h]. Thesis structure and information is too scattered, when reaction time is mentioned without any prove author talks about 1.5[s] and immediately after use in calculation 1[s]. problems with units, mixing imperial and metric, visual site as capital K in [kg], empty pages 20, 61 etc. After first simulation we are told max tension in material is 150[MPa] where max yield strength is 355[MPa]. Next information, where iterations will aim is missing. Possibly to weaken construction where max tension would be closer to 355[MPa] or lower this tension to end with lower values than 150[MPa]? From poorly generated pictures, reader can assume, final results to be lower but there is missing information about real improvement and benefit in absolute or relative values. Good approach is adding material in most loaded places and playing with shape of ribs, these changes are generally good way how to improve part design with little affect on cost and production. At the end of theses author recommend inspection of ribs after 500h which is pure divination from crystal ball. Similarly, conclusion is about recommendation of different brake system where it should be about benefit of this work.

eVSKP id 149135