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Casting production of an optimized inlet shape of pneumobile engine pneumatic cylinder
Bouchner, Jan ; Záděra, Antonín (referee) ; Krutiš, Vladimír (advisor)
Presented bachelor's thesis deals with production of a pneumatic component using hybrid investment casting technology. This method combines investment casting with additive technologies. The manufactured component, called cap-end, supplies compressed air to the pneumatic drive of a racing car. Complex design of this component was created using computer fluid dynamics optimization. This design was delivered by the Pneumobile racing team Brno. Presented thesis further contains a technological consideration taking into account solidification direction, on the basis of which the delivered geometry was modified. Manufacturability of the component is verified by a numerical simulation in the ProCAST environment. This thesis also describes printing process of a combustible model using fused deposition modelling technology. The combustible model is used in the production of a ceramic shell. Using said ceramic shell AlSi10Mg alloy casting was made. The component had to meet the requirements for leak tightness after machining and subsequent assembly. The leak tightness is assessed here as a pressure drop in a closed circuit measured over time. Furthermore, the effect of the cap-end on properties of the racing car in relation to the original geometry was investigated. The comparison is made on the basis of the race car's unloaded wheel speed measurements. The outcome of the thesis is a functional cap-end component that validates the results of a scientific article published by members of the Pneumobile racing team Brno.
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Control system for racing pneumatic monopost
Kaderka, Jakub ; Novák, Lukáš (referee) ; Levek, Vladimír (advisor)
The thesis is focused on developing a control system for a students project of racing car Falcon with pneumatic propulsion system. The electronic design was splitted into 4 standalone modules to increase reliability and mainain- ablitity of the system. The modules are engine control unit, power supply, human machine interface and speedometer. A CAN bus with customly designed communication protocol is used to interconnect these modules. Except the pneumatic circuit control the elekctronics takes care also about measuring the race related data (pressures in the pneumatic circuit, car speed, etc.). These values are stored on SD card and optionally sent over a wireless link to PC. In the second part of the thesis design of the firmware is described. For the debugging purposes a logging system was developed. The log messages from all modules are sent over CAN and stored on the SD card for post-mortem analysis. Unit tests were written for all elementary software blocks. The Falcon vehicle with this control system participated in the competition organised by the Hungarian company Aventics during May 2019. The Falcon ended on 8th place in long distance race and on 7th place in arcade race.
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Analysis and optimalization of pneumatic system of race pneumobile
Navrátil, Lukáš ; Nevrlý, Josef (referee) ; Ranuša, Matúš (advisor)
This thesis deals with the theoretical design of the new pneumatic system, which should lead to increased performance and fuel racing pneumobilu Blowfish. After the theoretical proposal deals with the analysis of both the new pneumatic circuit, and the old pneumatic circuit. The culmination of this work will be participating in the competition with the pneumobil in Hungary, Eger. The first part describes the current state pneumobilu contest and its rules. Further there are described in detail pneumatic elements that are used to pneumobilu. In the second part contains measurements that verify the effectiveness of the new pneumatic circuit.
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Suggestion of a workshop service platform for pneumobil
Suchý, Pavel ; Škopán, Miroslav (referee) ; Hloušek, David (advisor)
The subject of this bachelor’s thesis is a construction design of a mobile scissor lift based on lifting height, platform plate sizes and load capacity. The first part of this thesis studies a comparison of similar lifts. The second part of this thesis deals with a calculation of forces in the lift and a construction of partial components. The pneumatic cylinder is selected for the lifting and a pneumatic circuit is designed. Finally, the drawings of the assembly, drawings of the subassembly and drawing of the partial components are processed.
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Race car bonnet shape design based on flow analysis
Šnajdr, Petr ; Kvarda, Daniel (referee) ; Michalec, Michal (advisor)
The bachelor’s thesis deals with reducing aerodynamic drag of a pneumobile. The thesis summarizes knowledge in the field of vehicle aerodynamics and the principle of CFD simulations. The essence of the work is bonnet shape design of racing pneumobile Typhoon, developed at FME BUT, for lowest possible air resistance. CFD simulations are used to observe and analyse the influence of the bonnet shape on the aerodynamics properties. The designed shape solution of the bonnet significantly contributes to the reduction of aerodynamic drag compared to the existing bonnet. Thanks to this, the vehicle’s parameters are improved from maximum speed to the range. The acquired knowledge can also help in the further development of pneumobiles and in improving the setting of the computational model described in the work.
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Pneumobile dynamometer design
Fritscher, Matyáš ; Kubík, Michal (referee) ; Jeniš, Filip (advisor)
This bachelor thesis concerns design of measuring station with a dynamometer for a racing pneumobile developed by a student team. The aim of this device is to simplify the process of tuning of the vehicle and to make it more precise. At the beginning of the work, there is a research of current commercial solutions of dynamometer stations. Then, while choosing a suitable brake, there is an evaluation of the possibility of repurposing an old brake, given by the university for this project. After verifying that it meets the necessary requirements, there are several concept solutions presented. For the selected concept, with a specific design for this vehicle, there is a complete design solution including safety analysis of selected nodes.
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Design of the pneumatic circuits tester
Buš, Martin ; Ranuša, Matúš (referee) ; Kučera, Petr (advisor)
This bachelor thesis deals with the constructional solution of pneumatic circuit tester. In the first part of bachelor thesis there are brief information about Aventics Pneumobil Competition and racing vehicles of BUT team. The distribution of pneumatic cylinders, pneumatic control elements and sensors is outlined. The second part draws out a conceptual solution of load. Based on conceptual solution is developer structural design of pneumatic circuit tester.
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Design of topologically optimized upright for pneumobil race car
Mende, Milan ; Červinek, Ondřej (referee) ; Vaverka, Ondřej (advisor)
This thesis deals with the design of lightweight front uprights of pneumobile Javelin using topology optimization, followed by manufacturing by additive technology Selective Laser Melting. Aluminium alloy AlSi10Mg was used. Topology optimized parts should have met the requirement of minimal safety factor equal to 2, therefore the stress strain analysis was performed using FEM. The maximal deformation was determined and the safety factor obtained. Two unsymmetrical uprights were designed due to parameters of the brake system. The precision of manufacturing was verified by optical digitization. Machined uprights were mounted on the pneumobile and tested directly on the vehicle. No limit states were observed during testing and subsequent races, so they proved to be fully functional. Weight of the left upright was reduced from 1 609 g to 758 g, the right one was lightened to 741 g.
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Passenger car with pneumatic drive
Hudec, Miroslav ; Ramík, Pavel (referee) ; Píštěk, Václav (advisor)
The aim of this thesis is to propose a basic conception of passenger car chassis part with pneumatic drive (next only pneumobil). The pneumobil was designed mainly from BoschRexroth serial parts. The layout of this vehicle was arranged as dual-track with pneumatic drives with O 80 mm bore and stroke 125 mm. These engines are placed crossways top-down. Next I provided stress-strain analysis of rear bottom vehicle part, where act forces from rear wheels and pneumatic motor. The crucial task of this thesis is to design the chassis frame, choose suitable material and pneumatic motor for most effective usage of compressed air. The final goal is to propose an ideal gear ratio.
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