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Laboratory exercises of electronic elevator model
Kašpar, Ondřej ; Věchet, Stanislav (referee) ; Marada, Tomáš (advisor)
My Bachelor project is based on concept and realization of electronic model of elevator. This examplar works only on electric base without any mechanical components. This project at all will stay in laboratory of automatization. Students can use it as visual aid in studying and learning new things about programmable controller of Siemens, especially models S7-200. The movement of cabine of elevator is exemplified in bargraf, which you can leave control over then by active componets, LED drivers. The model is directed by micro-processor ALMEL ATmega128, which is connected with PC serial and paralel line. In my project you can find some descriptions of under consideration and used technologies, development system and constructional components.
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Mechanical construction of hydraulics arm
Vodrážka, Jakub ; Březina, Lukáš (referee) ; Věchet, Stanislav (advisor)
This bachelor’s thesis deals with design of a hydraulics arm. The main purpose of this hydraulics arm is the possibility to use it in education project which is a part of hydraulics systems lessons. This arm consists from few parts which are connected together by rotary joints. This arm is actuated by linear hydromotors, furthermore there is a magnetic position sensor. Autodesk Inventor 2008 was used during the arm design process. There are three main parts in this work. First part deals with fluids systems, the second part shows the position sensor properties and the last part presents some cases of arm design with deformation verify. A lot of supplement is presented at the end of this work as pictures of the model of the arm or pictures of some parts of the model.
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Robot model in the Python
Fikar, Josef ; Věchet, Stanislav (referee) ; Marada, Tomáš (advisor)
This work describes creation of simulation environment for mobile robot, which is designed to take part in Micromouse competition. Another solved issue is creation of communication interface and its control application, to provide combination between both robot and control program. Simulation is designed to serve as testing environment for development of tracking algoritm, which will guide robot through the defined labyrinth.
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Static and Fatigue Properties of Selected Al - alloy
Skoumalová, Zuzana ; Němec, Karel (referee) ; Věchet, Stanislav (advisor)
The present bachelor thesis focuses on material properties of wrought aluminium alloy AlZn4Mg1. The thesis deals with the interrelations between the alloy structure and its static as well as fatigue properties, especially with the latter. The first part of the thesis provides a summary of current knowledge in the studied field, experimental results can be found in the second part. Static properties of the alloy were examined with the help of measurements of hardness and a tension test, fatigue properties on the basis of experiments in high- and low-cycle regions.
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Influence of Homogenizing on Mechanical Properties of AZ91 Alloy
Provazníková, Andrea ; Liškutín, Petr (referee) ; Věchet, Stanislav (advisor)
This bachelor thesis includes photos and graphic representations of the influence of heat treatment on the mechanical properties of magnesium alloy AZ91. The structures of the alloy are recorded on the light microscopy pictures as well as photographs taken using a scanning microscope of fracture areas in the material. Results of a Tensile Test determining the strength and plastic properties and measuring of hardness and microhardness of the material are also included.
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Influence of Loading Frequency on Fatigue Properties of Structural Materials
Kašpar, Jan ; Němec, Karel (referee) ; Věchet, Stanislav (advisor)
This thesis analyse the influence of loading frequency on the fatigue of the structural materials. Low frequency loading (to the 200 Hz) has nearly no influence on the fatigue properties in almost all cases. Hight frequency loading (1 and more kHz) has major influence on the fatigue limit of the structural materials. This interference will disply like increasing of the fatigue limit. For example fatigue limit of steel is more affected by hight frequency loading than the cast-iron. Important aspect at hight frequency loading is rising temperature in the loading process. Rising temperature has negative influence on the fatigue limit of materials. Important aspect of the loading high frequency is possibility to achieved gigacycle regime of the fatigue (109 and more cycles), where should appear crack from below surface. This crack is call „ fish eye".
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Automatic environment generator design for mobile robot
Schreiber, Petr ; Krejsa, Jiří (referee) ; Věchet, Stanislav (advisor)
This work deals with design and realization of automatic environment generator, serving for autonomous robot simulations. The author describes various approaches to implementation of interior environment generator and their relation to Open Dynamics Engine physics library and XODE file format. This work also includes verification of generator functionality with participation of virtual mobile robot.
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Basics search for simultaneous localization and mapping.
Gärtner, Jan ; Marada, Tomáš (referee) ; Věchet, Stanislav (advisor)
This work deals with methods of simultaneous localization and mapping using in mobile robotic problems in the world. Main Goal of the work is describe existing and common using methods of simultaneous localization and mapping. The first part of the work deals with parting and description of each subproblems of simultaneous localization and mapping. The second part is note concrete methods of simultaneous localization and mapping. The third part is attending to practical application of simultaneous localization and mapping using in robotic tasks in the world. The last one is devoted to robotic application within the Faculty of Mechaniacal engineering at Brno Technical University and practicability apportionable methods for the applications.
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Covering the Working Space of Mobile Robot
Krejsa, Jiří ; Věchet, Stanislav
Equally distributed covering of working space is essential in some mobile robot applications, such as presentation robotics or security robot patrol. This paper explores a method for such covering based on rapidly exploring random trees (RRT) algorithm. RRTs can cover the working space close to completeness while uncovered areas are quickly reduced. The algorithm can be modified to emphasize certain areas of interest by appropriately generating corresponding goals. Method performance is compared to random walk in simulation experiments.
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