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Locomotion in extant and extinct nonhuman Hominidae: Implications for hominin bipedalism
Šetlíková, Julie ; Hora, Martin (advisor) ; Struška, Michal (referee)
The purpose of this thesis is to examine extinct and extant nonhuman Hominidae locomotion, through analysis of observational and fossil postcranial research. The extant genera reviewed were Pongo, Gorilla, and Pan. Knucklewalking is the primary locomotor form observed in African great apes while suspension predominates in Pongo. Less prominent are palmigrade quadrupedalism, bridging, vertical climb, scrambling, and other forms of suspensory behavior. Bipedalism, primarily assisted, is found in all examined extant apes with Pongo utilizing it the most. Extinct genera were selected based on the recent, thoroughgoing phylogenetic study by Pugh (2022), categorizing probable stem hominids, stem hominids, pongines, and hominines. Main forms of locomotion utilized were quadrupedalism, vertical climb, and suspensory behavior. Kenyapithecus and Sivapithecus are suggested to have used, along arboreal quadrupedalism, knucklewalking. Most of the discussed hominines, phylogenetically closest to our chimpanzee-human last common ancestor (CHLCA), have limited postcranial data and locomotion could not be concluded. Danuvius guggenmosi, Lufengpithecus lufengensis, and Ouranopithecus macedoniensis are thought to have employed bipedalism. Lufengpithecus and Danuvius further show signs of recently termed extended limb...
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Vehicle Hydropneumatic Systems
Ševčík, Michal ; Míša, Jiří (referee) ; Blaťák, Ondřej (advisor)
This work deals with hydropneumatic suspension systems. It is a narrow development branch of suspension that has a stable position in the current market. It brings with it a number of key functions that can be essential to the main workload of certain machinery. The downside of these features is often the design and financial complexity of the system. For this reason, the system is mainly compared with the classical concept of conventional suspension systems with steel springs. The wide range of functions that the system can provide is also described. Based on the theoretical knowledge, the concept of a hydropneumatic suspension system for the Ford TRUCKS 1833 DC is proposed. A series of calculations are performed to determine the basic parameters of the system. The obtained results are used to select system components from the current market offer. The hydraulic cylinders, which are one of the main components of the hydropneumatic units, are designed specifically for the vehicle based on strength calculations.
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Design of suspension for an electric off-road motorcycle
Hlaváč, Pavel ; Hejtmánek, Petr (referee) ; Míša, Jiří (advisor)
This master thesis deals with the design of suspension for an electric off-road motorcycle. The aim is to determine the optimum damping force and spring stiffnesses for a motorcycle with given parameters for different rider weights. Some input parameters had to be measured, such as tire stiffness and damping, fork and shock damping of the same type of motorcycle. Other damping forces were created using the measured ones to cover wider range of damping ratios. Then these forces and spring stiffnesses were tested in quarter car and half car models to evaluate the changes in suspension setting on rider comfort a ride safety. Then the ideal damping forces and spring stiffnesses for an electric off-road motorcycle are determined from the simulations performed.
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Drop Test of Airplane Suspension - Springing and Damping
Fousková, Karolína ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
This thesis discusses aircraft landing gears, describes the basic requirements placed on them, and outlines their primary classifications and construction, including damping and suspension methods. It describes the drop tests used in aviation and the methods of their evaluation, demonstrating the results of selected tests through simulation analysis. The thesis also includes the design concept of the testing equipment.
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Design of Electric Urban Vehicle Chassis Components
Nebus, Martin ; Míša, Jiří (referee) ; Hejtmánek, Petr (advisor)
This thesis deals with the design of the chassis components of an electric urban vehicle and its final structural design. The introduction of the thesis contains the division of electric urban vehicles into different categories, which differ in various technical parameters. Subsequently, the different chassis components and their structural designs that can be found on these vehicles are mentioned. A conceptual design is involved in the selection of suitable parts, either commercially available or calculated to meet criteria such as functionality and reliability. The structural design, which has been developed based on FEM analyses, simulations and calculations, provides the final design of the chassis, brake and steering parts.
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Design and optimization of the hydraulic suspension model
Zrnčík, Matej ; Králík, Jan (referee) ; Radil, Filip (advisor)
Tato práce se zaměřuje na návrh a optimalizaci modelu odděleného hydraulického odpružení s cílem dosáhnout požadovaného dynamického chování automobilu. Model zavěšení je vytvořen v prostředí Matlab, Simulink. Tato práce popisuje proces návrhu modelu zavěšení, zjištění vstupů do jeho simulace, určení výstupu simulace a proces jeho optimalizace. Nakonec vyvození závěrů z výsledků optimalizace.
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Electronic Control Systems of Vehicle Springing and Damping System
Ladatkin, Vladislav ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
The bachelor's thesis explores the topic of electronic suspension and damping control systems of vehicles. Modern suspension systems make it possible to solve the existing conflict between ride comfort and vehicle handling by reacting to changing driving conditions in real time. The theoretical part of the thesis is dedicated to a detailed description of current electronic control systems, including the construction of springs, shock absorbers and control valves. The practical part focuses on the design of a rotary adjustable damper valve for an adaptive suspension system. The results of this work contribute to a better understanding of modern technologies in the field of vehicle suspension and damping control.
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Springing and Damping of Bikes
Borovička, Jan ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
This thesis focuses on the creation of a computational model of a full-suspension bicycle, with the model developed using the MSC Adams View software. The literature review section describes damping units and various types of rear linkages, which are crucial for the functioning of suspension systems in bicycles. The practical part of the thesis details the structure of the model and the sensitivity analysis, examining the impact of different parameters on the model's behavior. To validate the results of the computational model, physical measurements were conducted to verify its accuracy and correctness. The thesis concludes with a proprietary design of a full-suspension bicycle, based on the insights and analyses carried out during the development and testing of the model.
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Vehicle suspension design and testing methods
Šenkeříková, Veronika ; Tobiáš, Martin (referee) ; Fojtášek, Jan (advisor)
This bachelor's thesis is dedicated to suspension systems and their typology. Furthermore, the basic geometric parameters of these systems are discussed in the thesis. Types of suspensions (axles) are classified according to the interdependence of individual wheels. Subsequently, the thesis provides an overview of simulation software for chassis development and testing in the virtual phase of development. These are divided according to computational principles, result evaluation, and environment. The last section addresses issues related to chassis testing and its properties as a whole, testing individual chassis components to verify durability etc. The thesis includes specific representatives of testing conditions. For each chassis component, a representative from each chassis subsystem is selected. This thesis provides a current overview of methods and tools used in the automotive industry for development and testing. It demonstrates the importance of both virtual testing and testing on testbeds for already finished products.
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Development of transaxles in automobiles
Kubiš, Vojtěch ; Kaplan, Zdeněk (referee) ; Píštěk, Václav (advisor)
This bachelor thesis is concerned of development of transaxles in automobiles. Overview of types of axles is mentioned here as well as their working principles. Attention is also given to suspension and damping with description of how it works. In this thesis are described solutions of selected cars suspensions.
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