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Design of a special effector for autonomous robot
Med, Slavomír ; Knoflíček, Radek (referee) ; Pavlík, Jan (advisor)
This master’s thesis deals with the design of a specialized end effector for an autonomous robot capable of collecting plant samples from plant leaves. The theoretical part describes the classification of industrial manipulators, their end effectors, and briefly outlines plant research. Plant research is the specific application area for this end effector. Based on a review of available solutions, several conceptual variants are proposed, and the best one is selected using multicriteria analysis. This concept is tested and further developed until its final form. Subsequently, calculations are performed for the pneumatic circuit of the end effector, and safety requirements are outlined. The conclusion of the thesis includes an economic evaluation of the entire end effector, project assessment, and recommendations for further steps.
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Increased suction speed of the fire pump using CAE
Hluší, Martin ; Maxa, Jiří (referee) ; Vyroubal, Petr (advisor)
This thesis adresses the issue of designing a new system for flooding the centrifugal pump equipped in the PS-12 type motorized fire pump. Initially the fire attack as a sport and the motorized fire pump PS-12 with the gas vakuum pump are described. Then the problem, this thesis adresses, is covered. The next chapters describe the Computer-aided engineering method and fluid flow with regards to flow through nozzles. Practical part of this thesis starts with simulations of the current gas vakuum pump equiped on the PS-12 pump. The design process of the new flooding system is described next and simulations as well as testing of the constructed prototype are used to validate its function.
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Experimental verification of ejector and creation of mathematical model.
Strmiska, Michal ; Štigler, Jaroslav (referee) ; Habán, Vladimír (advisor)
This diploma thesis deals with the area of ejectors. In the intoduction, an ejector is classed as an hydraulic machine. There is also an introduction of the principle and application of this machine there. The next part describes two different ways of calculation and there is a suggestion how to get characteristics, that were achieved by calculation in MS Excel, projected. The purpose of this diploma thesis is to confront this mathematical model with the experiment done in school laboratory at Kaplan department of hydraulic machines. The description of this experiment and the evaluation procedure of measured values is described in the final part of this diploma thesis.
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Ejectors and it's utilization in industry
Zejda, Vojtěch ; Hájek, Jiří (referee) ; Vondál, Jiří (advisor)
This work aims at introducing ejector pumps. It describes the working principle, advantages and disadvantages and restrictions of their usage in various applications. Main disadvantage of ejectors is the low efficiency which limits the usage only in specific applications where it is not considered to be a crucial factor. Therefore, examples of usage of various ejectors in industrial processes are listed further. Last but not least, in these examples are also demonstrated difficulties and reasons why it is favourable to use an ejector rather than other types of pumps. Further off, this work deals with design methods of ejectors and compares their suitability. It appears that not all the methods are suitable for ejector design, because it depends greatly on presumed shape of a certain ejector. In the end, there is compared energy intensity of an ejectors and common centrifugal pumps and confirms energy disadvantage of ejectors.
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Self-priming pump
Urban, Jiří ; Hudec, Martin (referee) ; Pochylý, František (advisor)
Diploma thesis is focused on self-priming pump 25 - OVE Sigma pumpy Hranice s.r.o., for its function is essential the ejector which is placed in the body of the pump. On the basis of the results of measurements there are designed construction modifications using a mathematical model. For the first time were made measurements to verify the self-priming capability with determining the maximum suction height.
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Proposal of Engine Intake System with Exhaust Gases Recirculation
Vojkůvka, František ; Štěpánek, Karel (referee) ; Dundálek, Radim (advisor)
The object of the diploma thesis is to optimize vacuum function of the ejector using computional fluid dynamics, or CFD. The ejector is inserted to the intake system of the six - cylinder diesel engine to increase the pressure gradient of the exhaust gas recirculation system. The analysis of the current design solution is performed and then the ejector with the new shape affording higher vacuum effect is proposed. The introductory part is devoted to the questions of diesel engines emissions and technology to reduce emissions in the exhaust system focused on the EGR.
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Improvement of the suction capacity of the fire-engine pump
Archalous, Jakub ; Habán, Vladimír (referee) ; Pochylý, František (advisor)
This diploma thesis deals with reducing the time of sucking water into the rotating impeller of the centrifugal pump as used in firesport. The suction is carried out by the ejector, which is powered by combustion engine exhaust gases. A mathematical model was created, which shows the flow in the ejector. It was also used as a basis for the creation of a new ejector, which has an increased airflow when getting closer to atmospheric pressure.
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Modeling of flow in ejector
Bílek, Martin ; Habán, Vladimír (referee) ; Štigler, Jaroslav (advisor)
This diploma thesis deals with the flow modelling in the ejector using the FLUENT software. It develops a diploma thesis created in the past, where a mathematical flow model in the ejector was created and experimentally tested. The aim of this work is to analyze the ejector calculations and to model a flow in an ejector of the same shape as in the experiment and under the same conditions, too. Another objective was to assess the influence of the throat length and to examine if the pressure in the ejector mixing chamber remains constant. Finally, the disagreement between the experimental figures and the ones gained from the mathematical model of the ejector are discussed.
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Design of combustion chamber 30 kW for gaseous fuels
Rychter, Aleš ; Hudák, Igor (referee) ; Skryja, Pavel (advisor)
Master thesis deals with design of combusting chamber for gaseous fuels with predicted thermal output less than 30 kilowatts. Designed equipment will be used as a generator of flue gases with required parameters further used for experimental catalytic unit. Due to the need of draft creation inside the combustion chamber and exhaust pipe is master thesis also deals with design of ejector nozzle, which will be used for this purpose. Opening chapters of this work, considering a theoretical part, are focused on basic classification of combustion chambers and industrial burners. Next and main chapter is dedicated to main goal of this work, which is combustion chamber design, containing necessary calculations divided into balance calculation and construction design. Final chapters deals with above mentioned calculation of ejector nozzle ensuring sufficient draft and also sufficient cooling of flue gases incoming from catalytic unit.
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