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Analysis of mechanical loads of selected structural parts of the excavator during operation
Busta, Michal ; Maňas, Pavel (referee) ; Vosynek, Petr (advisor)
This thesis is focused on the issue of computational modeling of soil harvesting while using the compact excavator from the company DOOSAN BOBCAT EMEA s.r.o.. The solution consists in creating two computational models in Rocky DEM and Ansys Mechanical. Rocky DEM software is used to solve the disconnection of soil by excavator components using the discrete element method. The outcome includes courses of forces and moments during the particular time of the individual joints of the model that was used. The obtained courses are then applied as an external load to the joint of a selected structural part of the analyzed model using a kinematic model in ANSYS Mechanical. The kinematic model consists of simplified geometry models of individual parts of the excavator arm, and a more detailed geometry model of the analyzed part of the arm. All the parts are connected to each other by rotational bonds representing joints. A static structural analysis of the mechanical stress is performed in ANSYS Mechanical for the prepared model during the simulated process. Finally, the selected structural part is assessed with respect to the elastic limit and fatigue strength.
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Trajectory planning of Vehicle with Four Independently Steered Wheels
Śniežek, Roman ; Dobossy, Barnabás (referee) ; Brablc, Martin (advisor)
This thesis focuses on a kinematic model of a four-wheel steering vehicle and its simulation. The aim of the thesis is to use the kinematic model and path following algorithms to create a trajectory as a vector of the wheel steering angles dependent on a time and the distance travelled. This trajectory provides a collision-free transfer from starting position to the goal on a map with static obstacles. This could be used in an autonomous vehicle while navigating in a known enviroment
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The mechanical model of five-bar linkage robot.
Večeřa, Václav ; Chromý, Adam (referee) ; Burian, František (advisor)
This work presents the problem of designing a planar pantograph for the required dimensions of the working space and the subsequent follow-up methods to design the length of the arms, which will ensure this range. According to these requirements, a mechanical model is created. For which is calculated and measured accuracy and precision of reaching the required position dependent on the setting error of the RX-64 servomotors and error in the length of arms due to method of manufacturing.
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Modelling and control of wheeled mobile robots
Jonszta, David ; Šembera, Jaroslav (referee) ; Šolc, František (advisor)
The thesis deals with modelling and control of wheeled mobile robots. The thesis introduces the mathematical models of diferentially driven mobile robot, robot with Ackerman steering and a skid steered robot. The thesis describes open-loop and feedback control. Feedback control is divided into point-to-point control, path following and trajectory tracking.
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Odometry of Experimental Vehicle Car4
Štarha, Matěj ; Adámek, Roman (referee) ; Dobossy, Barnabás (advisor)
This thesis focuses on the creation of odometry for experimental vehicle Car4. First, necessary HW and SW improvements are carried out. A research of kinematic model and known algorithms for position estimation is then conducted. Two algorithms are implemented in Matlab and their functionality is verified using simulation followed by tests of the actual trajectory of the vehicle. The goal of this work is to create a basis for any following work on the vehicle, e.g. in autonomous driving.
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30 Years ff Geodynamic Research in the Territory of Northern Moravia
Švábenský, Otakar ; Pospíšil, Lubomil ; Weigel, Josef
As part of the investigation of the geodynamics phenomena, the deployment of GNSS technology, which enables effective determination of the kinematic tendencies of the upper layer of the earth's lithosphere, represents an important contribution. The Institute of Geodesy of BUT in Brno, as the first university institute in the Czech Republic, could practically use this technology since 1992, and one of the first activities was involvement in geodynamic research on a national and international scale. It is significant that it was just during this period that a local research geodynamic network covering the Czech and Polish parts of the Králický Sněžník massif was built. It was the first project of this kind in the territory of Moravia, and our institute had the opportunity to actively participate in this project. Today, at the commemoration of the 30th anniversary of the establishment of the Sněžník network, we can state its significant contribution to our scientific research and teaching activities. Since then, our activities in the field of GNSS geodynamic applications have expanded to the entire territory of Moravia, and later to the Czech Republic. A significant factor was the establishment of close 19 http://dx.doi.org/10.13164/seminargnss.2023.18 contacts with experts in other geoscience fields (geology, geomorphology, geotectonics, seismics, etc.), which made it possible to apply and present our results in a broader context of mutual cooperation. It has been confirmed that it is important to confront and integrate the results of geodetic measurements with all the relevant geoscientific knowledge that is currently available. This paper mainly deals with two topics. The first is a 30-year measurement period in the Sněžník network. The second is a description of our other activities focused on the investigation of geodynamic active areas of Moravia, especially its northern part. One of the significant results is the compilation of the initial kinematic model of the Moravian part of the Bohemian Massif and its continuous addition and refinement.
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Odometry of Experimental Vehicle Car4
Štarha, Matěj ; Adámek, Roman (referee) ; Dobossy, Barnabás (advisor)
This thesis focuses on the creation of odometry for experimental vehicle Car4. First, necessary HW and SW improvements are carried out. A research of kinematic model and known algorithms for position estimation is then conducted. Two algorithms are implemented in Matlab and their functionality is verified using simulation followed by tests of the actual trajectory of the vehicle. The goal of this work is to create a basis for any following work on the vehicle, e.g. in autonomous driving.
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The mechanical model of five-bar linkage robot.
Večeřa, Václav ; Chromý, Adam (referee) ; Burian, František (advisor)
This work presents the problem of designing a planar pantograph for the required dimensions of the working space and the subsequent follow-up methods to design the length of the arms, which will ensure this range. According to these requirements, a mechanical model is created. For which is calculated and measured accuracy and precision of reaching the required position dependent on the setting error of the RX-64 servomotors and error in the length of arms due to method of manufacturing.
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Analysis of mechanical loads of selected structural parts of the excavator during operation
Busta, Michal ; Maňas, Pavel (referee) ; Vosynek, Petr (advisor)
This thesis is focused on the issue of computational modeling of soil harvesting while using the compact excavator from the company DOOSAN BOBCAT EMEA s.r.o.. The solution consists in creating two computational models in Rocky DEM and Ansys Mechanical. Rocky DEM software is used to solve the disconnection of soil by excavator components using the discrete element method. The outcome includes courses of forces and moments during the particular time of the individual joints of the model that was used. The obtained courses are then applied as an external load to the joint of a selected structural part of the analyzed model using a kinematic model in ANSYS Mechanical. The kinematic model consists of simplified geometry models of individual parts of the excavator arm, and a more detailed geometry model of the analyzed part of the arm. All the parts are connected to each other by rotational bonds representing joints. A static structural analysis of the mechanical stress is performed in ANSYS Mechanical for the prepared model during the simulated process. Finally, the selected structural part is assessed with respect to the elastic limit and fatigue strength.
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Trajectory planning of Vehicle with Four Independently Steered Wheels
Śniežek, Roman ; Dobossy, Barnabás (referee) ; Brablc, Martin (advisor)
This thesis focuses on a kinematic model of a four-wheel steering vehicle and its simulation. The aim of the thesis is to use the kinematic model and path following algorithms to create a trajectory as a vector of the wheel steering angles dependent on a time and the distance travelled. This trajectory provides a collision-free transfer from starting position to the goal on a map with static obstacles. This could be used in an autonomous vehicle while navigating in a known enviroment
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