National Repository of Grey Literature 35 records found  beginprevious17 - 26next  jump to record: Search took 0.00 seconds. 
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.
Proposal to drive the fan impeller for ripening chamber
Dvořáček, Ondřej ; Strecker, Zbyněk (referee) ; Dvořáček, Jiří (advisor)
The Bachelor’s thesis deals with a structural design of proposal to drive the fan impeller with vertical axis of rotation for ripening chamber. The introduction gives a brief description of types, parts and operating principles of air conditioned chambers in meat technology. The second part of this work is focused on the design of belt drive, impeller bearing housing and electric motor layout. Thesis contains fundamental engineering calculations for horizontal and vertical axis positions as well as technical drawings.
Testing of automotive sport suspension
Čípek, Pavel ; Růžička, Bronislav (referee) ; Strecker, Zbyněk (advisor)
The diploma thesis deals with testing of sports car suspension. The aim is the testing of fast magnetorheological damper in semiactive suspension that corresponds to quarter car model. The fast magnetorheological damper has a response time 2 ms. If the response time is short enough (order of units miliseconds) it is possible (based on earlier simulations) to achieve improvement of driving safety (better stability of force of tyre on roadway) and comfort (reduction of vibrations). The thesis proves this statement with series of experiments.
Optimization of Control Algorithm of MR Damper
Strecker, Zbyněk ; Kotaba, Ondřej (referee) ; Ondrůšek, Čestmír (referee) ; Šindelář, Martin (referee) ; Mazůrek, Ivan (advisor)
This work deals with the usage of magneto-rheological (MR) damper in the semi-active car suspension. Semi-active suspension can improve ride comfort or tyre grip to the level, which cannot be achieved with the common passive setting of the damper. MR damper has however features, like time response of the controller with MR damper and the control range of the MR damper, which limit area of application. It was found out that especially the time response of the damper significantly influences the efficiency of semi-active algorithms. Current MR dampers with controllers are not capable of efficient control of the semi-active suspension. For proper design of semi-active suspension with MR dampers, the time response must be decreased. Therefore, a new PWM current controller was designed and verified. Also changes in MR damper design which eliminate eddy-currents in the magnetic circuit were proposed. The results of this work should contribute to the better design of semi-active suspension systems with MR damper.
Remote car monitoring
Strecker, Zbyněk ; Fiedler, Petr (referee) ; Bradáč, Zdeněk (advisor)
The main goal of this work is to design an efficient and cheap car-alarm with an electricity consumption not exceeding 1mA in the stand-by mode. The first part focuses on the conception of the car-alarm. As the best option - GPS/GSM car-alarm conception is chosen. Then the design of the switching power supply, communication via RS232 with the GSM module, and GPS module, I2C communication with accelerometer and timer IC, and design of the display module are described. Furthermore, the process of how to code/decode sms into the PDU format is also discussed in this part. The second part provides some basic empirical characteristics of the switching power supply (efficiency, switching frequency etc.). Then the owchart of the main loop is explained, followed by an example of the sms which the car-alarm sends in case a car theft. Explanation of how to set up timer, acceleration threshold and the time between the check of the sms commads is the subject of the next section. Fifth part deals with the installation the car-alarm into a car which is illustrated on the Skoda Favorit example. Total costs and also different cost items are listed just before concluding and suggesting some potential improvements of the device.
Sedimentation of MR fluid at the start of new space lanucher
Berka, Pavel ; Strecker, Zbyněk (referee) ; Roupec, Jakub (advisor)
This bachelor thesis deals with sedimentation behavior of magnetorheological fluid exposed to acceleration 1-6 G. That simulates start of a space launcher. Main goal of this work is to bring new knowledge of MR fluids behavior. Experiment of accelera-ted sedimentation as well as the long term sedimentation is presented, including new method and measuring device developed to measure the sedimentation, in order to compare different commercial MR fluids. Results from this work will be used in development of the new semiactive dum-ping system for carrying load in ESA new space launcher.
Design of MR clutch water cooling
Musil, Marek ; Strecker, Zbyněk (referee) ; Roupec, Jakub (advisor)
This paper describes the design and manufacture of water refrigeration for magneto clutch. MR clutch cooling problem was solved by designing of several variants of which was finally chosen the best. Model of water cooling was developed and subsequently made. The cooling is consolidated on a stator of MR clutch. Cooling completely surrounds the body of an MR clutch and thus achieves a high heat transfer between the cooling system and cooled. The proposal was developed with a view to good foldability, so its use is not complicated.
Aditional modification of Subaru test engine ignition advance
Gášek, Martin ; Mazůrek, Ivan (referee) ; Strecker, Zbyněk (advisor)
This bachelor’s thesis deals with design and application of an additional vari-able ignition advance for Subaru Robin EH34 engine connected with an experimental station TecQuipment TD301. At the beginning, a basic theory for the ignition advan-ce is given. Then a way how to measure an ignition point and engine characteristics is described. Manufacturing and assembly of the mechanism is covered. In the end a comparison of p-V and p- diagrams for various ignition settings is done. Influence of power output is discussed.

National Repository of Grey Literature : 35 records found   beginprevious17 - 26next  jump to record:
Interested in being notified about new results for this query?
Subscribe to the RSS feed.