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The influence of conditioning on the mechanical properties of polymers produced by injection molding technology
Neužil, Tomáš ; Řehořek, Lukáš (referee) ; Válka, Libor (advisor)
The aim of the thesis is to determine change of mechanical properties of three types of damp polymeric materials (polyamides) depending on the water content inside material. Before testing, specimens of all three types of materials were placed inside the air conditioning chambers until equilibrium (conditioned) state was reached when the specimens received the maximum possible amount of water from the environment. A total of three conditioning levels were set, representing besides the standard level of conditioning both extreme states like state when the material was fully dried and the state where the material content the largest possible amount of water. With the increasing content of water bound in material, there is a characteristic change in the mechanical properties of the material, such as a decrease in strength and modulus of elasticity and an increase in toughness and ductility. To examine material properties change, tensile and Charpy impact tests were performed, Charpy impact tests were performed for both specimens with and without a notch. Besides changes in mechanical properties, the rate of water absorption was also observed depending on the materials and its filling.
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Mobile Robots´ GPS Navigation
Tesáček, Zdeněk ; Neužil, Tomáš (referee) ; Krištůfková Dvorská, Jolana (advisor)
This bachelory thesis solve problems GPS navigation. Some more accurately methods of navigation are showed such as differencial GPS, system H-Star, system Czepos and popular Kalman filter. Alternate communication between receiver GPS and microcontroler is wrote, processing NMEA sentences and graphics visualization outputs. Precision data outputs are instrumental mobile robot Ryder navigation.
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Four legged walking robot
Fischer, Jan ; Krištůfková Dvorská, Jolana (referee) ; Neužil, Tomáš (advisor)
The object of this thesis is an analysis of the possibilities of a wireless communication and a sensor‘s equipment for a four legged walking robot. The thesis is divided into three parts. In the first part there is a particular sale’s exploration in the section of the wireless communication modules. It refers to the differences among technologies in the methods of signal transmission, the technical parameters but also in the communication protocols. The next part of this thesis is focused on sensor’s equipment with the accent on the possibility of use for a four legged walking robot. It contains a short listing of sensors, which are available in the Czech Republic with division based on the type of sensing magnitude. These two parts make a base for the last part where I have chosen suitable communication modules along with sensors and realization wireless data transfer including control and visualization. The result of this thesis is the complete communication block from the user to the robot.
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Four legged walking robot
Veleba, Tomáš ; Krištůfková Dvorská, Jolana (referee) ; Neužil, Tomáš (advisor)
The diploma paper deal with control problems of a four legged walking robot. They endeavour to establish and partly implement the walking and control algorithms. They are divided into six parts. Individual chassis types and their advantages and drawbacks are analysed in introduction. Next part describes mechanical design of the robot and also all realised electronics facilities. The third part describes in detail sensors that are used by the robot. Following part deals with description of robot's walking. It explains individual walking phases and analyses both static and dynamic stability. Next part contains description of the robot's software facility. The software facility of the control micro-controller and the algorithm that generates walking are explained in this part. It also describes software facility of control application in computer. Exploration of the possibilities for wireless control is carried out in the last part.
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Mobile robot design
Uherek, Vítězslav ; Neužil, Tomáš (referee) ; Krištůfková Dvorská, Jolana (advisor)
This work deals with issues of construction and sensors used in mobile robots. At the start of this work are examples of mobile robots for all environments are introduced. The primary aim is to design autonomous mobile robot that is able to navigate from a starting point to a goal point, both given by data from GPS coordinates and data from sensors. Part of this work is a design, realization and optimal layout of sensors on RC model E-maxx.
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Simultaneous Localization and Mapping Using Mobile Robot
Neužil, Tomáš ; Šolc, František (advisor)
This work presents an overview of the simultaneous localisation and mapping (SLAM) problem in the mobile robotics. The Extended Kalman filter (EKF) based algorithm for localisation and mapping is proposed. For EKF algorithm the models of the skid steering mobile robot and the laser scanner are presented. The EKF algortihm is feature based algorithm, therefore the method for the landmark position determination was developed. This segmentation method is based on the clustering of the Radon transform space. Proposed SLAM algorithm was tested with real data measured with UTAR mobile platform. Achievments of the work are summarized in the conclusion of the proposed work and possible improvements of the components are suggested.
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Materials for Production of Small Firearms
Neužil, Tomáš ; Lidmila, Zdeněk (referee) ; Molliková, Eva (advisor)
The aim of this thesis is to summarize information of small firearms, both in terms of their historical development and the origins of the crafting firearms, through the development of locks and a history of the weapons, which were during this development invented, to the emergence of a single bullet, which is still used today, so from the perspective of our time focusing on the choice of barrel materials, the issue of loading and fatigue barrel and bore when fired and conventional production technologies barrel bore.
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Modeling of the Vertical Flight Profile
Valíček, Josef ; Neužil, Tomáš (referee) ; Kučera, Pavel (advisor)
Diplomová práce se zabývá modelováním letadla a simulací různých typů letu. Pro modelování letu bylo podle zadání vybráno proudové letadlo s dlouhým doletem – Gulfstream G550. V první části práce jsou podrobně popsány pohybové rovnice letadla. Dále je vysvětlen numerický model letadla, sestavený na základě pohybových rovnic. Pochopení modelu letadla je nezbytné pro modelování a simulaci vertikálních profilů letu. Práce se zaměřuje na nastavení parametrů modelu letadla podle reálného letadla Gulfstream G550 a modelování vertikálního profilu letu v letové fázi CRUISE. Posledním bodem práce je průzkum optimálního letu letadla vzhledem ke spotřebě paliva. V závěru jsou diskutovány dosažené výsledky a je nastíněn směr případného pokračování práce.
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The influence of conditioning on the mechanical properties of polymers produced by injection molding technology
Neužil, Tomáš ; Řehořek, Lukáš (referee) ; Válka, Libor (advisor)
The aim of the thesis is to determine change of mechanical properties of three types of damp polymeric materials (polyamides) depending on the water content inside material. Before testing, specimens of all three types of materials were placed inside the air conditioning chambers until equilibrium (conditioned) state was reached when the specimens received the maximum possible amount of water from the environment. A total of three conditioning levels were set, representing besides the standard level of conditioning both extreme states like state when the material was fully dried and the state where the material content the largest possible amount of water. With the increasing content of water bound in material, there is a characteristic change in the mechanical properties of the material, such as a decrease in strength and modulus of elasticity and an increase in toughness and ductility. To examine material properties change, tensile and Charpy impact tests were performed, Charpy impact tests were performed for both specimens with and without a notch. Besides changes in mechanical properties, the rate of water absorption was also observed depending on the materials and its filling.
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Materials for Production of Small Firearms
Neužil, Tomáš ; Lidmila, Zdeněk (referee) ; Molliková, Eva (advisor)
The aim of this thesis is to summarize information of small firearms, both in terms of their historical development and the origins of the crafting firearms, through the development of locks and a history of the weapons, which were during this development invented, to the emergence of a single bullet, which is still used today, so from the perspective of our time focusing on the choice of barrel materials, the issue of loading and fatigue barrel and bore when fired and conventional production technologies barrel bore.
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