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Analysis of powertrain systems of forestry machines, taking into account the possibilities of hybridization
Šintaj, Andrej ; Škopán, Miroslav (referee) ; Mergl, Václav (advisor)
This bachelor’s thesis analyses the drive systems of forestry machines and their hybridization. The used electro-hybrid systems in forestry are discussed together with their basic components. Forestry machinery is divide into: skidders, harvesters, forwarders, forwarding trailers and cable yarders. In each subsection the conventional and electro-hybrid systems that are used or have been used are discussed in detail, together with schematic drawings. In comparison, reduction of consumed fuel and emission is pointed out, which can lead to a reduction not only of the price of harvested wood, but also to an improvement of the climate situation. Hybrid systems have many advantages, but they also have weaknesses wich are pointed out at the end of the work.
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Design of technological equipment for remediation of wood infested by a bark beetle
Němec, Tomáš ; Osička, Karel (referee) ; Sedlák, Josef (advisor)
This bachelor thesis focuses on the design of technological equipment for the sanitation of wood infested by the spruce bark beetle. The main idea of the proposed technology is the combination of harvester logging with chemical sanitation using spraying. This innovative approach allows for increased sanitation efficiency and reduced costs compared to traditional methods such as manual debarking or using backpack sprayers. The results show that the harvester ensures uniform coverage of insecticide on each felled tree, thereby minimizing the risk of inadequate sanitation. The proposed technology also reduces the number of workers needed for sanitation, which contributes to further cost savings and increases the overall efficiency of the process. The thesis further addresses the technical aspects of the proposed equipment, including a detailed description of individual components such as nozzles, pumps, tanks, and control systems. Testing of the prototype demonstrated its high efficiency and reliability under various working conditions. In addition to technical benefits, the thesis also highlights the ecological advantages of the proposed solution, which minimizes negative impacts on the environment through precise dosing of chemicals and reduced need for manual handling of infested wood. Overall, it can be concluded that the proposed solution is not only economically advantageous but also technically and ecologically beneficial, and it should significantly contribute to the protection of Czech forests from the bark beetle calamity.
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Powertrain systems of forest machines of the CTL technology
Janík, Richard ; Malášek, Jiří (referee) ; Mergl, Václav (advisor)
This bachelor's thesis contains a research analysis of drive systems of forest machines of harvester technology. At the beginning, harvester technology machines and their functions are described. The next chapters deal with the drive systems of these machines. The main topic is hybrid drive systems, which are divided into individual categories in this work, and diagrams of drive systems of specific harvester technology machines are created and described.
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Vibration energy harvester as a tuned mass damper
Novák, David ; Machů, Zdeněk (referee) ; Rubeš, Ondřej (advisor)
This bachelor thesis it's about vibration energy harvester as a tuned mass damper the design of a vibration generator as a dynamic vibration damper.The work contains a research part, which examines the methods of damping mechanical systems and the influence of the vibrating generator on the vibrating base. Based on this knowledge, equations of motion were derived for the design of the model in the SIMULINK program, where we optimized the parameters for maximizing the obtained electrical power and maximizing the damping effect.
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Design of micro drive for harvester
Jonák, Vojtěch ; Pokorný, Jan (referee) ; Škopán, Miroslav (advisor)
This master thesis deals with design of hydrostatic drive for harvester. It contains calculations of parameters from current drive like speed, hydraulic losses and tractive effort. Because now these parameters are insufficient in next part of work is proposed few options how to achieve required parameters. In selected cases are made calculations and based on the results are recommended two options for realization.
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Harvester
Brychta, Vojtěch ; Kašpárek, Jaroslav (referee) ; Škopán, Miroslav (advisor)
Content of this bachelor’s thesis is critical research of harvesters, especially designed for the thinning felling. According to bigger amount of the wheel harvesters in comparison with the tracked harvesters in the Czech Republic, is this work focused on the machines with the wheeled chassis. In the beginning of this work is discussed division of harvesters, second chapter is about construction. Next parts are focused on current conceptual solutions, comparison of machines, including comparison of the harvester heads and energy wood heads. In the conclusion is mentioned supposed development of wheeled harvesters.
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Design of Harvester
Cimbál, Martin ; Chorý, Tomáš (referee) ; Křenek, Ladislav (advisor)
This thesis focuses on design solutions for the Harvester. It is a machine designed for the extraction of timber in large quantities. Its major place of employment is in coniferous forests. The machine is able to cut down the tree, remove branches from the tree and cut it into requested segments suitable for the removal and all in one step. The main aim of the thesis is to create an original shape solution for the Harvester, a machine for the wood harvesting, with a view to future development. The total concept is based on the present progressive, constructional technology solutions. Machine design is based on the the fundamental ergonomic requirements that make it easier for drivers to work. In the proposal I use a combination of a wheeled harvester with a walking robot design.
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Hydrostatic travel drive for harvester
Dano, Matej ; Juřík, Josef (referee) ; Škopán, Miroslav (advisor)
The object of this master’s thesis is design of a suitable hydrostatic travel drive for harvester. The first part dedicates of constructions of harvesters and actual different conceptions of travel drive. Next, there are design of hydrostatic circuit, calculation of general hydraulic parameters and design of hydraulic components in the second part. The last part deals with issue of combustion engine and cooler.
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Handling equipment for forestry
Martinec, Patrik ; Pokorný, Přemysl (referee) ; Hloušek, David (advisor)
This bachelor thesis is focused on a research treatise on a forest fleet. The beginning of the work outlines the historical development of machines in the woodworking industry, it also deals with harvesters and their individual division according to specifications. The work also focuses on important parts of the harvester such as the hydraulic crane and harvester head. In the same spirit of comparison and division, export tractors are developed in the work. The chapter of the last work summarizes wheel loaders and their use in the woodworking industry. At the end of the thesis, the individual goals and outputs of the bachelor's thesis are evaluated.
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