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MR Strut of Steward Platform for Vibration and Shock Isolation
Macháček, Ondřej ; Šindelář, Martin (referee) ; Mazůrek, Ivan (advisor)
The thesis deals with design magnetorheological strut of vibration isolation adapter for cosmonautics. For its optimization is necessary to create several virtual models. The dynamic model of the mechanism - the Stewart platform, rheological model for determining the damping force of MR damper and model of the magnetic circuit to guarantee the required intensity in the gap. These models, along with controls models that are primarily concerned with strength calculations, will help with design. Designing using virtual models requires constant monitoring and verification. It is a rather broad topic including eliminate vibration also kinematics, dynamics, hydraulics, pneumatics and last but not least electronics and magnetism. It is necessary to communicate with experts in their field and use their knowledge and experience to create, but also to control of the individual models. The thesis was created in cooperation with Honeywell Aerospace Division (ESA).
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Data Processing from Shock Dyno Damper Measurement
Vaněk, Vojtěch ; Vančura, Jan (referee) ; Blaťák, Ondřej (advisor)
In the first part the bachelor thesis deals with the issue of the damper on theoretical side. In the introduction there is a brief overview of the used dampers, furthermore the characteristic values of the dampers, testing methods, and finally the various negative events and influences during the operation of the damper. In the second part, the bachelor thesis deals with the analysis of a damper, which was tested on damper dynamometer MTS EMA-234 2K in ÚADI workshop. We will attempt to describe the behaviour of the measured damper or anticipate the damper defects due to the findings from the theory described in the first part.
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Design of an electronically controllable damper for the recoil of guns
Bajza, Radoslav ; Strecker, Zbyněk (referee) ; Kubík, Michal (advisor)
This bachelor thesis deals with usage of magnetorheologic technologies for damping the recoil of artillery guns. Commonly used passive recoil dampers use complex mechanisms in order to achieve the needed damping force, which negatively impacts their reliability. This problem can be solved by use of a magnetorheologic damper, where the damping force can be controlled electronically. The designed damper is of simple construction with double sided piston rod. The damper fluid is magnetized in a bypass, which is located externally of the damper cylinder. The liquid goes through megnrtisation in parallel grooves, which are located within the bypass. The contribution of this thesis is theoretical exploration of behavior of magnetorheological damper under impact loading of recoil of large caliber artillery. The main outcome of this thesis is the design of a magnetorheologic damper, which is able to function at high velocities and under the load of large forces.
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Schim Valve of Hydraulic Suspension Damper
Reisch, Martin ; Blaťák, Ondřej (referee) ; Hejtmánek, Petr (advisor)
This bachelor thesis is focusing on the problem of the shim valve in a hydraulic suspension damper, its pressure drops and the effect of different modifications of the valve on the properties of the complete damper. In the first part, an overview of the shim assemblies used on the shim valve is made and the influence of the different assemblies on the damping properties of the shock absorber is described. The effect of the different parameters of the shims (thickness, radius, position) on the overall stiffness of the shim assembly is described. In the next section, an overview of analytical models for the calculation of stiffness and pressure drops on the shim valve is developed and a FEM methodology for the calculation of valve stiffness is established. All computational methods are compared with measured data on a real damper throughout the paper.
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Springing and Damping of Truck Cabin
Kroupa, Ondřej ; Vančura, Jan (referee) ; Blaťák, Ondřej (advisor)
This Diploma Theses, which can be included in the field of vehicle dynamics, explores the effect of suspension and damping of truck cabs for the safe ride and comfort. As the driver spends many hours in their vehicle, comfort is the most essential criterion. That is why we seek possible improvements which are offered by the sprung cab. The research part firstly analyses the individual elements of suspension and damping. The following chapter is devoted to the systems which are used nowadays in the construction of cabin suspension. Next there is the introduction to the theoretical production of a simplified computational model as well as the presentation of the possible evaluation of the achieved results. The following practical part deals with the actual shaping of the computational model in the Adams View software, which is based on a real vehicle, and was lent at the faculty. The model is then verified and compared with the existing state and the cab mounting concepts are tested on it. The effects of cab parameters on driving comfort and safe riding were tested on it as well. The last part focuses on the forming of the special Dakar computational model, on which optimization was performed according to the findings discussed in the previous chapter. Also, the appropriate configurations to the real-life testing were designed.
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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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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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On-road Diagnostic of Vehicle Damper
Vaněk, Vojtěch ; Hejtmánek, Petr (referee) ; Blaťák, Ondřej (advisor)
The diploma thesis deals with the analysis of the effects of shock absorber wear on the driving dynamics of the vehicle. Furthermore, a quarter model of the car was created in the Simulink software, where a procedure for evaluating the condition of the shock absorber while driving the vehicle was created. This procedure was subsequently validated on real measured data from the Hummer H3 car.
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On-Road Damper Force Measurement
Hornák, Filip ; Blaťák, Ondřej (referee) ; Hejtmánek, Petr (advisor)
The first part of the master's thesis deals with basic types and functions of dampers, together with a search of commonly used methods of damper force measurements. Consequently, a design of an on-road damper force measuring assembly is made and positioned onto a 3D model of a vehicle's damper. In the final part of the thesis there is made an evaluation of conditions of use of the measuring assembly together with its versatility.
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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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