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Hydrodynamic dampers on the principle of magnetic fluid
Přikryl, Matěj ; Himr, Daniel (referee) ; Pochylý, František (advisor)
This bachelor's thesis deals with damping vibrations emerging due to the movement of a vehicle. The first section provides an overview of contemporary types of dampers with thorough explanation of the principle of hydrodynamic damper. This section also contains simulation of vibrating vehicle equipped with passive damper. Literature research of magnetic fluids and description of magnetoviscous phenomenon is presented in the second part, which freely continues to the topic of magnetorheological (MR) dampers. The final chapter firstly describes current hydrodynamic dampers based on squeeze film (SF) mode of magnetorheological fluid and at the conclusion the author's concept of SF MR damper is submitted.
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Spring and Damper Tester
Šulák, Jakub ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
This work deals with the springs and dampers questions. It focuses on their classification, characteristics and testing. The main part of this thesis describes the design and sizing dimensions of machine for measuring characteristics of automotive springs and conceptual design of machine for detection characteristics of hydraulic shock absorbers.
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Adjustable dampers
Doležal, Kamil ; Blaťák, Ondřej (referee) ; Vančura, Jan (advisor)
This thesis elaborates with information about basic types of dampers, which are used nowadays. There is a description of primary parts and function of passive, adaptive, semiactive and active suspension systems. A part of a work is also evaluation of their advantages and disadvantages.
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Reconstruktion of road simulator.
Stodolák, Michal ; Roupec, Jakub (referee) ; Mazůrek, Ivan (advisor)
This bachelor’s thesis is dealing with reconstruction of drum road simulator, which is placed in laboratory of The Institute of Machine and Industrial Design. The first part is attended to basic dividing of road simulator. The second part contains description and analysis of the current machine. In the next part is an analysis of chosen variation and their construction. The last part of thesis is attended to the lightening of the load wheel in period, when the test doesn’t run.
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Comparison of semi-active and conventional vehicles suspension systems in terms of driving comfort
Baroš, Eduard ; Blaťák, Ondřej (referee) ; Suchý, Jan (advisor)
The main object of this bachelor thesis is comparing characteristic properties of selected types of suspension affecting driving comfort of vehicles. The introduction briefly acquaints the history and purpose of the suspension. It describes the dynamics of vehicle suspension. It includes distribution, description of the construction and activity of the suspension elements, their use in conventional type of suspension and semi-active suspension system. Further classifies known suspension systems into categories and deeply analyses their properties. The result is a comparison focusing on driving comfort. The last chapter is dedicated to suspension developing trends in near future.
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Design of Low-Pressure Piston Rheometer
Lán, Radek ; Strecker, Zbyněk (referee) ; Roupec, Jakub (advisor)
This thesis is focused in design of Low-Pressure Piston Rheometer intended for experimental identifying of magneto-rheologic (MR) liquid properties at long-term load. MR liquid is briefly introduced in the initial part of the thesis. There follows a search related to way of liquids properties measurement and overview of MR dampers which are close to piston rheometers by their construction. MR dampers with through piston-rod have been emphasised. The second part of the thesis is focused on calculation of magnetic circuit of the rheometer throttle leak. The rheometer is designed in the last part of the thesis.
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Mathematical Model of Vehicle Damper
Vrba, Michal ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
This master’s thesis describes development of parametric model of monotube damper which would be able to predict damping forces. This model is intended for 3-way racing dampers which are built with foot valve and external adjusters. Each flowing path was included to calculate the damping force. Also, mathematical model for shim stiffness was created. First part of the master’s thesis was focused on the description of function of the damper and physical effects that influence damping characteristic. In the next part, the mathematical model was described. The damper was correlated and validated on damper dynamometer. Final part of thesis focuses on the investigation of input arguments and their influence on resulting damping.
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Magnetorheological damper for Formula Student
Dlápal, Václav ; Strecker, Zbyněk (referee) ; Mazůrek, Ivan (advisor)
The master thesis deals with design, manufacturing and testing of a prototype magnetorheological damper developed for Formula Student vehicle. The aim was to design and test the damper with similar damping properties to the vehicle as a conventional damper has. Target force-velocity curves were set using quarter car model and evaluated comparing minimal contact force of a tyre for conventional and newly developed damper characteristics. Structural analysis of designed parts, hydraulic and static magnetic analysis were performed. Manufacturing of a specific part magnetorheological damper part was described – piston. Manufactured prototype damper characteristics were evaluated.
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The Use of Inerter in Vehicle Design
Lanzendörfer, Tomáš ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
This diploma thesis deals with the inerter application in vehicle’s suspension. The aim was to perform a theoretical analysis of its features, to compare its construction layouts, to create a multibody model of the car’s suspension and to analyse inerter’s effects while performing different driving manoeuvres. All analyses were performed by MSC Adams View software with a little support from Matlab. The quality of ride comfort and accessible traction force were increased by the inerter almost in every case, and dynamic load of the suspension was also decreased in some cases. The inerter is a device with high potential, but with high purchase costs as well, so further development and practical research is necessary.
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Front Axle of a High-performance Sports Car
Hrudík, Jan ; Blaťák, Ondřej (referee) ; Drápal, Lubomír (advisor)
Tato diplomová práce byla psána při studentské zahraniční stáži, pod záštitou Evropské Unie – program „ERASMUS Student Mobility for Placement“. Stáž byla absolvována mezi prosincem 2010 a květnem 2011 ve společnosti a.d.Tramontana, mající sídlo v Palau de Santa Eulália, Španělsko. Pro kompletní návrh podvozku a odpružení jakéhokoli vozidla je nezbytná znalost mnoha technických disciplín. Tato diplomová práce se zabývá dvěma z nich – odpružení a řízení. Nejprve je rozebrána teorie, na kterou se může navázat v praktické části práce. Velká pozornost byla věnována srozumitelnosti textu a názornosti obrázků, bez zbytečných detailů, avšak bez vynechání důležitého. Tuto práci je tedy možné užít jako prvního kroku před návrhem podvozku. V další části je popsáno, jak byla probraná teorie využita při návrhu řízení u skutečného vozu, přičemž největší pozornost je věnována Ackermannově teorii řízení a geometrii zabraňující samořízení při propružení. V závěrečných částech je pozornost věnována ukázce některých z každodenních činností v malosériové výrobě automobilů – jde o zjištění maximálně možného pohybu kola při propružení a proces výroby příčných trojúhelníkových ramen včetně návrhu jejich připevnění k šasi.
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