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Design of reciprocal module fixture for wear and friction measurements in tribometer
Zeman, Petr ; Šperka, Petr (referee) ; Dočkal, Kryštof (advisor)
The thesis deals with design of a clamping fixture for fastening surface samples for the reciprocating drive of the tribometer. The fixture is designed to compensate for shape deviations of the samples by tilting in two axes in a small range. The objective has been fulfilled, the tilting mechanism is achieved by rotating the spherical surface. The fixture is sufficiently rigid. It has been achieved of better user experience and repeatability of clamping. The paper contains an overview of commercially available clamping methods, their evaluation and description of the construction of the newly designed device, which simplifies the clamping of uniquely shaped samples for the reciprocating drive of the UMT TriboLab tribometer.
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Analysis of multicopter design concepts
Zeman, Petr ; Koštial, Rostislav (referee) ; Dvořák, Petr (advisor)
The main objective of this thesis is to design multicopter with very high flight endurance compared with commonly achieved performances. The beginning is devoted to description of the commonly used terms and components on multicopters with MTOW up to 20kg. This part is followed by detecting dependencies of parameters between themselves from parametric analysis commercially available platforms. Subsequently are investigated factors affecting the efficiency of the propulsion unit like motor location on the arm and the voltage of the battery. Next is done comparison in terms of efficiency of configuration with one motor per arm and two motors in coaxial arrangement. In research the coaxial configuration one part is dedicated to the determination of the efficiency at different speeds of two motors and different directions of propeller rotation relative to each other. Subsequently is determined reference characteristic for efficiency of propulsion units with different weights. Especially in connection with the next part is here shown comparison of Li-Ion and Li-Po battery. The last part is about design multicopter based on previous findings.
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Horizontal belt conveyor
Zeman, Petr ; Pokorný, Jan (referee) ; Špička, Jiří (advisor)
This project proposes a conveyor belt for given material and transport output. A functional calculation is carried out ČSN ISO 5048 which specifies main dimensions and propulsion proposal. Based on strength analysis, calculation of shaft of driving drum is performed. Individual components of conveyor are chosen from catalogues of the companies, which are engaged in these questions, whose products are accessible in the Czech Republic.
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Design of reciprocal module fixture for wear and friction measurements in tribometer
Zeman, Petr ; Šperka, Petr (referee) ; Dočkal, Kryštof (advisor)
The thesis deals with design of a clamping fixture for fastening surface samples for the reciprocating drive of the tribometer. The fixture is designed to compensate for shape deviations of the samples by tilting in two axes in a small range. The objective has been fulfilled, the tilting mechanism is achieved by rotating the spherical surface. The fixture is sufficiently rigid. It has been achieved of better user experience and repeatability of clamping. The paper contains an overview of commercially available clamping methods, their evaluation and description of the construction of the newly designed device, which simplifies the clamping of uniquely shaped samples for the reciprocating drive of the UMT TriboLab tribometer.
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The methodology of using digital tachograph data for forensic engineering purposes
Zeman, Petr ; Kledus, Robert (referee) ; Drahotský, Ivo (referee) ; Doupal, Emil (referee) ; Libertín, Josef (advisor)
Control authorities and experts in their practice come across digital tachographs. Digital data is an important source of relevant input data and informations needed for in depth road accident analysis. In practice, it is possible to encounter an existing negative phenomenon, an unauthorised access to and fraudulent manipulation of the tachograph´s data. False data has a major impact on the results of the accident investigation and analysis. Control authorities and experts should be prepared for such cases. This thesis describes the different types of manipulation of Digital Tachograph records and the ways of their detection. Tachograph manipulation is a nowaday issue. It is very important to deal with this problem. For the reasons mentioned above I have set up a Data Control Procedure Standard for control authorities and experts and drafted technical requirements for future generation of tachographs.
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Ways of Using Digital Tachograf Data for Authorised Experts' Work
Zeman, Petr ; Novotný, Jiří (referee) ; Libertín, Josef (advisor)
The introduction of digital tachographs has brought many changes compared to previously used analogue tachograph. Legislation addressing this issue is quite extensive and often amended. Ever-present threat of industrial equipment, which affect the observed, and the stored data has a negative impact on road safety. The aim of this paper is to present a comprehensive overview of legislation regulating the issue of digital tachographs in relation to the introduction and use of digital tachographs, with obligations to use a tachograph, tachograph functional requirements. Process further review of data on vehicle operation recorded with a digital tachograph and analyze their availability in terms of approval of the different actors (the driver, carrier, service, police, other supervisory authorities). Contribution of this work is the elaboration of recommendations for the expert's methodology in analyzing data from the digital tachograph.
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The rationalization of Construction price statistics
Zeman, Petr ; Konečný, František (referee) ; Nový, Martin (advisor)
The subject of the thesis "Rationalization of Construction price statistics" is to outline the issue of reporting of construction activities in the Czech Republic and try to be as simple as possible for statistical purposes, if possible. From a theoretical approach for construction work price indices and their stats go over to the practical part calculation of indices. Available data from the Czech Statistical Office on price indices of building work in recent years converted in terms of weights of permanent representatives from the perspective of individual statements. The goal is, to find a satisfying combination of representatives of both methodological procedures and exclude them from the forms for reporting. This should be saved in time statistical survey of individual respondents and abridged interpretation of outputs of the Czech Statistical Office.
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Design of VUT 051 RAY aircraft with hybrid power unit
Zeman, Petr ; Bencalík, Karol (referee) ; Píštěk, Antonín (advisor)
The master´s thesis deals with a design of hybrid power unit for a small aircraft. The Introductory part goes into the problems of hybrid power unit and describes its current use in aviation. In the next part of the thesis aircrafts VUT 051 RAY and Skyleader 600 are described and the aircraft with better aerodynamic characteristic is chosen. A suitable conception of hybrid power unit is proposed for this aircraft. On the basis of the proposed conception basic flight performance are figured out. After that a weight and blance analysis are made with the chosen power unit components and thair arrangement. In the final part electric motor mounting and a frame for holding batteries are designed.
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Air Cargo
Zeman, Petr ; Chlebek, Jiří (referee) ; Šošovička, Róbert (advisor)
The bachelor thesis looks at the system of air cargo. The first part deals with division of aircraft cargo compartments into classes in accordance with safety rules. The following part describes the usage of air containers and pallets and refers to a possibility of transportation of special kinds of cargo. The main ways of cargo transportation by various kinds of aircraft are explained. Some special cargo aircraft are described in more detail. The last part of the thesis is concerned with ground support. The requirements which have to be supplied by an airport are mentioned and also the technical equipment for handling of cargo.
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Design of an optimized multicopter propeller
Zeman, Petr ; Matějů, Jiří (referee) ; Dvořák, Petr (advisor)
Výdrž a účinnost multicopterů jsou z velké části ovlivněny výběrem pohonného systému, zejména pak vrtulí. Avšak u malých bezpilotních prostředků, které většinu času stráví ve visu (např. multicoptery), pracují vrtule při nízkých Reynoldsových číslech, případně i v režimu odtržení. Tyto problémy a efekty spojené s rotací jsou řešeny pomocí korekcí aerodynamických koeficientů a aplikovány na vírovou teorii. Tento přístup vede k významnému zvýšení přesnosti výpočtu leteckých vrtulí. Nicméně pro nulovou rychlost nabíhajícího proudu mají tyto korekce tendenci nadhodnocovat hodnoty tahu vrtule. Pro snížení výpočetní náročnosti a času nezbytného k získání potřebných aerodynamických vlastností pro různá Reynoldsova a Machova čísla jsou použity neuronové sítě. Celý proces je implementován do prostředí MATLAB (včetně grafického rozhraní, neuronových sítí a adaptivních algoritmů) a validován na pěti různých vrtulích k prokázání, že vypočtené výkony vrtulí se shodují s experimentálními daty. Variační počet byl vybrán jako metoda pro návrh optimalizované vrtule, jelikož s jeho využitím lze navrhnout vrtuli s maximálním tahem pro zadaný výkon. Pro ověření zvoleného přístupu byla navrhnuta optimalizovaná vrtule, jejíž koeficient tahu je vyšší než odpovídající vrtule, se kterou je srovnávána, při zachování stejné hodnoty koeficientu výkonu.
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