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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

Design samojízdného žacího stroje na trávu / Design of Self-Propelled Mower

Zapletálek, Martin January 2014 (has links)
This thesis deals with the analysis and design OF self-propelled mower on the grass. The machine is designed for cutting fodder, and their subsequent treatment. Focusing on the vast scope and great hourly output. The design emphasis is on compliance ergonomic rules, easy maintenance and functionality of the machine. For a very innovative features can be seen ejecting the cab, crop spacing on the sides, drive hydraulic cutter bars. In particular, the location of the cabin and boarding colors and folding machine cutter bars during transport. The machine was created to perfect performance, operator comfort, performance focused on large cysts and fluid design.
12

Technicko-ekonomická analýza hydrostatických axiálních převodníků.

Vaverka, Ondřej January 2014 (has links)
This thesis focuses on developing a general summary and description of the function of the hydrostatic drives used in modern agricultural harvesting technology. The following is a list of practical application of the hydrostatic drives on the machine at the same time giving a description of the function of the system. The third part is an evaluation of the measurement of the five hydraulic pumps hydrostatic ground drive combine CLAAS Lexion 560. The hydraulic pumps are classified according to the operating hours, the graph is plotted Q-p characteristics of the pumps and in the end is compared to the wear depending on the operating time. The last part of the thesis deals with the analysis of damage of the hydraulic pump drive combine harvester and determining the cost to repair the drive according to the selected type of repair.
13

Pemrlovací stroj pneumatický / Bush–hammer pneumatic machine

Matula, Tomáš January 2008 (has links)
This thesis deals with the design of a pneumatic facing machine used to dress pavement surfaces aesthetically and anti-slip-wise. The introduction describes the general overview and examples of pavement. The second part deals with the analysis of the machine and its technical specifications. Further parts contain proposals for the pneumatic circuit, paint system and functional calculations. The drawing documentation has been prepared to the extent of manufacturing drawings and sets.
14

Návrh stroje pro odstředivé lití / Design of centrifugal casting machine

Kokavec, Miroslav January 2019 (has links)
This master’s thesis is focused on design of centrifugal casting machine. Thesis includes the sorting and description method of centrifugal casting with overview of available machines. Proposal of parameters of centrifugal casting machine is done. Thesis includes technical-economic review of projection proposal for main parts of the machine. Design parameters are calculated and plan of machine is done. Safety assessment of proposed of machine variant is done. 3D model and drawings are included in thesis.
15

Analýza tepelných vlastností synchronního stroje / Analysis of thermal properties of the synchronous machine

Paszek, Michal January 2012 (has links)
In this Master´s thesis will be performed an analysis of thermal properties of synchronous machines in the program Ansys Workbench on a simplified model of synchronous traction motor. In the first section will be performed thermal analysis without cooling followed by analysis of air flow and finally thermal analysis with cooling for fan speed 1500 min-1 and 3000 min-1. The second section will describe the principle, construction and losses on the synchronous machine. The third chapter will describe concepts such as heat, temperature, heat transfer, types of the heat transfer, specific heat capacity, emisivity and thermal conductivity. The fourth chapter will introduce the program Ansys Workbench, finite element method and Ansys CFX. In the fifth chapter will be described how to perform thermal analysis on the created model of motor. The sixth chapter will describe how to analyze the air flow of the created model of motor. The flow analysis will be performed for fan speed 1500 min-1 and 3000 min-1. In the seventh chapter will be compared the results of the air flow and pressure field in the motor model. In the eighth chapter will be performed a thermal analyzis on the created motor model with cooling for fan speed 1500 min-1 and 3000 min-1. The nineth chapter will compare the results of temperatures and heat fluxes obtained from the thermal analysis witnout cooling, with cooling for fan speed 1500 min-1 and 3000 min-1 for full losses, half losses of continous running, and full losses of interrupt running for 9000 seconds (2 hours 30 minutes).
16

Analýza budicího proudu u synchronních strojů / Analysis of field current in synchronous machines

Kocman, Roman January 2013 (has links)
This master’s thesis is focused on the analysis of the excitation current in synchronnous machines. Contains a description of excitation systems for synchronous machines, meaning and design of the sliding contact ant its representation in electrical machines. The main part of the work is focused on the evaluation of the field current of the three plants. The work includes graphic record of the excitation current of the hydroelectric power station Slapy, provided record from the power plant Opatovice was for evaluating load of turbo-generators. Provided record from the nuclear power plant Temelín was for evaluating.current division into individual brushes. The conclusion is a summary of the achieved knowledge.
17

Návrh a optimalizace třífázového synchronního alternátoru s hladkým rotorem / Design and optimization of three-phase synchronous generator

Šulák, Ondrej January 2013 (has links)
My work will not inform you only with the issue of magnetic field, but also with design complications such as: proposal winding, analysis cogging, the machine connection to infinite bus and independent network and their solutions in the design of electrical machine. In the introductory chapter, we tried to offer the most accurate theory of magnetic fields because it is hard to understand that episodes of physical design of the machine is our alpha and omega. Shows the results of the program RMxprt and Maxwell, where we simulate the synchronous machine with the connection nominal load. The results of the program are verified and compared with calculations.
18

Konstrukce zakružovačky ocelových profilů / Construction of rolling machine of steel sections

Křivohlávek, Pavel January 2010 (has links)
The aim of this thesis is to design steel beams bending machine. In the introduction, is characterized by a bending machine and carried out research costs, including factory-produced manufacturers. Followed by a proposal of alternative solutions, evaluating them and selecting the most appropriate conception. The next section is described in detail the proposed model, including stress analysis of loaded parts. The thesis also examined the safety of a forming machine, prepared an analysis of possible defects and their consequences in the design. Finally, it created the design documentation on the proposed machine made pricing and maintenance described rolling machine.
19

Nájezdy pro přívěs pro přepravu stavebních strojů / Ramps for trailer for buildings machines transport

Dvořáček, Michal January 2010 (has links)
The aim of my dissertation on the subject of raids on trailer for transport of construction equipment is to propose a functional concept of rear split folding ramps for trailer construction machines with tracked and wheeled landing gear. Raids are designed as a two-part, hydraulically tilting. With an appropriate mechanism to ensure a correct function of the ramp end part at tilting. Maximum weight of the machine is 21 000 kg and departure angle is 10 °. This thesis was composed with cooperation SVAN ltd.
20

Konstrukce jednoúčelového frézovacího stroje / Design of single-purpose milling machine

Čunek, Jakub January 2013 (has links)
This thesis provides a brief introduction to the technology milling and analysis of various parts of milling machines. In addition, this thesis focuses on the design of a dedicated milling machine for machining functional areas of aluminum cast.

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