National Repository of Grey Literature 26 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
The design of inverse pendulum
Kukla, Ondřej ; Zapletal, Tomáš (referee) ; Strecker, Zbyněk (advisor)
This thesis deals with design of inverted pendulum and experimental prove its functionality. Design was made in MATLAB Simulink software and experiment meant that pendulum can turn about 360°. In this thesis is described functional device which meets all asked requirements. There is also described process of design and construction of inverted pendulum which is the main benefit.
Measurement of wear in shock absorber with magnetorheological fluid
Žáček, Jiří ; Strecker, Zbyněk (referee) ; Roupec, Jakub (advisor)
This bachelor thesis deals with measurement of abrasivity of magnetorheological fluids and its effect on hydraulic shock absorber. The abrasion could be measured and evaluated by many ways. The pin on block measurement method has been selected for this test. The pin was moving on a steel block while the whole system was surrounded by magnetorheological fluid. According to results, the lifetime of magnetorheological shock absorber is 4 times shorter than classical damper. Results of this thesis could be helpful in damper construction or in development of new magnetorheological fluids.
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.
Development of electronic parking system
Šmíd, Josef ; Strecker, Zbyněk (referee) ; Paloušek, David (advisor)
This bachelor thesis deals with the development of the electronic parking system, which is intended to navigate the drivers to the nearest vacancies, using the Arduino platform. The introductory part deals with an overview of the current state of knowledge. The research section provides an overview of the Arduino base plates and other modules and sensors selected for conceptual design solutions. The construction part deals with the design of the casing according to the selected components and the subsequent realization of the whole device, including the program, for testing under real conditions. The test results are finally evaluated and summarized in the final discussion.
Design of semiactive suspension for mountain terrain bike
Mráz, Kryštof ; Kubík, Michal (referee) ; Strecker, Zbyněk (advisor)
This Bachelor Thesis is focused to design semiactive suspension of mountain bike using MR damper. In research part of thesis is summarised knowledge about passive and semiactive suspension of mountain bikes and about MR dampers. Behaviour of suspended front fork was simulated using virtual dynamic model which was created in graphic environment MATLAB Simulink. Semiactive algorithms Skyhook and modified Groundhook and for comparison also passive settings are simulated. According to results of these simulations is designed semiactive suspension with MR damper which has effect to stabilising contact force of front wheel and therefore increases safety of rider.
Design of fast magnetorheological damper piston group using selective laser melting technology
Vítek, Petr ; Růžička, Bronislav (referee) ; Strecker, Zbyněk (advisor)
The diploma thesis deals with the development of the magnetic circuit of Magnetoreological (MR) dampers with a short time response. To achieve a short response time, a shape approach was chosen whereby the geometry of the magnetic circuit was chosen to significantly eliminate the occurrence of eddy currents. The influence of structures on magnetic properties was first examined on a simpler toroidal core and then the optimization was subjected to the magnetic circuit of the MR damper itself. Geometry optimization was done using FEM simulations. The resulting geometry was made of pure iron using Selective Laser Melting technology (SLM). In addition, a MR damper was completed and its properties on air and with MR fluid were measured, which were then compared with previously developed rapid MR dampers. It has been found that the newly designed magnetic circuit achieves similar time responses as all other compared fast MR dampers and reaches a higher dynamic range than most of the compared variants. The proposed magnetic circuit also has a significantly reduced weight.
The design of fast magnetorheological valves without the use of ferrites
Strmiska, Tomáš ; Růžička, Bronislav (referee) ; Strecker, Zbyněk (advisor)
This diploma thesis deals with development of a new generation of magnetic circuits of fast magnetoreological (MR) dampers that will not use problematic ferrite materials. To ensure a short response time, eddy currents must be avoided. Using the Finite Element Method, 2 solutions were proposed - the use of soft magnetic composites with high electrical resistance and the cutting of grooves in metallic material. Subsequently, 2 magnetic circuits were produced - one from Sintex SMC prototyping material composite and one from 11SMn30 steel with 48 deep grooves 0,35 mm wide. Both were implemented into the MR damper and tested on a hydraulic pulsator. The results of the experiments were compared with 2 different MR dampers: one with 11SMn30 magnetic circuit without grooves and another with the Epcos N87 ferrite magnetic core. It has been found that both new circuits have ensured an equally short response of the damper force to the change of electric current like ferrite. At the same time, a much larger dynamic range was ensured. Compared to 11SMn30 without grooves, the new circuits provided approximately 7x faster response.
Mechanical construction of electromagnetic valves in automotive
Sušovský, Martin ; Novák, Petr (referee) ; Strecker, Zbyněk (advisor)
The bachelor thesis brings complex view at electromagnetic valves used in automotive. Providing closer information about its function in important parts of car. This study is mostly focused on usage of the electromagnetic valves in an injection systems, like high pressure common-rail system used in diesel engine from BOSH. Furthermore, in main part of the study, technical solutions, that lead to reduced response time, which results to improved performance of the valves, are investigated.
Analytical model of gun firing mechanism dynamics
Tkadlec, Josef ; Strecker, Zbyněk (referee) ; Šperka, Petr (advisor)
This bachelor thesis is devoted to creation of the analytical model of the dynamics of gun firing mechanism, that is used for design of individual parts of the mechanism, allowing the primer to be initiated properly. This analytical model has been verified by experimental measurement of the real mechanism operation from Brno Combo shotgun using a high speed camera Vision Research Phantom v710. In addition, the minimal energy, needed for initiation of FOCCHI 616 (.209 TYPE) primer, was experimentally measured using the test device and the high-speed camera. The results of experimental measurement of minimal initiation energies were compared with the experimental data from Sellier & Bellot primer producer.
The study of sedimentation of MR fluids for space applications
Vančurová, Martina ; Strecker, Zbyněk (referee) ; Roupec, Jakub (advisor)
This bachelor thesis deals with experimental determination of the effect of iron particle size on the sedimentation rate of magnetorheological (MR) fluids. MR fluids from three producers are examined here: Liquids Research Limited (Great Britain), HaoHua (China) a LORD Corporation (USA). Particles describing the effect of MR fluids’ different attributes on their sedimentation are summarized in an overview of current knowledge. The development of the Matlab script, that detects and measures the size of particles in the input electron microscope images, is presented. The particles are also measured manually in some images, which is partly used as a reference measurement for the developed script. The particle size measurement results are then compared with the sedimentation behavior of examined MR fluids.

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