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The calculation of the adequacy of energy supply lines DPMB
Bednařík, Jaroslav ; DPmB, Jiří Šebor - (referee) ; Matoušek, Antonín (advisor)
This paper contains an introduction that describes the current situation of the problem and its energy supply improvement. It discusses everything from power substations to trolleys which are fed through sections. There is a reference to the network operating deficiencies and possible solutions. The second part describes the development of these networks and their modernization in a growing city. It is verified by calculation if were our considerations good and proposed network will be normally reliable and capable. The final part deals with the economic balance of the project and its various alternatives. Development of energy networks and facilities cost many finance and these investments do not show immediately. Future will be paid off because as soon the changes come less problems may occur.
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Evaluation of the Causes of Traffic Accidents Involving Public Transport Vehicles in Brno
Ševčíková, Lucie ; Finstrle, Jiří (referee) ; Panáček, Vladimír (advisor)
My master´s thesis is concerned with the problems of traffic accidents involving public transport in Brno. The first part of my master´s thesis is concentrated on an analysis of the structure of the vehicle fleet of the Dopravní podnik města Brna, a.s. (DPMB). There is an evaluation of traffic accidents of the vehicles of Brno´s public transport in the second part, according to the kind of traction. An analysis of the causes of the most common accidents was carried out on the basis of the ascertained results. In the last part, my master´s thesis is concerned with a proposal of measures to reduce the accident rate.
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Single railway electrification system design
Svoboda, Ondřej ; Radil, Lukáš (referee) ; Pelc, Jiří (referee) ; Drápela, Jiří (advisor)
The main topic of the thesis is the design of single-track electrification of a direct current system of 3 kV and an alternating current system of 5 kV 50 Hz and then economically evaluate it over a period of 30 years. The work deals with basic traction systems and also deals with the calculation of main parameters of electric trains. The thesis describes in detail the procedure for the design of the electrification of the track and a partial introduction to the simulation programs that were used for energy calculations.
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Friction Modification within Wheel-Rail Contact
Galas, Radovan ; Meierhofer, Alexander (referee) ; Pfaff, Raphael (referee) ; Hartl, Martin (advisor)
Předložená disertační práce se zabývá experimentálním studiem modifikátorů tření a maziv pro temeno kolejnice, které jsou aplikovány do kontaktu kola a kolejnice za účelem optimalizace adheze a redukce hluku. Hlavním cílem práce bylo objasnit vliv aplikovaného množství a složení těchto látek na adhezi v kontaktu. Hlavní pozornost byla věnována zejména potencionálním hrozbám souvisejících s kriticky nízkou adhezí, která může nastat po aplikaci těchto látek. Experimentální studium probíhalo v laboratorních i reálných podmínkách, konkrétně v tramvajovém provozu. V případě laboratorních experimentů byl využit komerční tribometr a dvoudiskové zařízení umožňující simulovat průjezd vozidla traťovým obloukem. Kromě samotné adheze bylo při experimentech sledováno také opotřebení a míra hluku. Výsledky ukázaly, že maziva pro temeno kolejnice jsou schopna poskytovat požadované třecí vlastnosti, nicméně jejich chování je silně závislé na aplikovaném množství. V případě předávkování kontaktu dochází ke kriticky nízkým hodnotám adheze, které vedou k výraznému prodloužení brzdné dráhy. V případě modifikátorů tření bylo ukázáno, že chování těchto látek je výrazně ovlivněno odpařováním základního média. Výsledky také ukázaly, že nadměrné množství částic pro modifikaci tření může způsobit kriticky nízké hodnoty adheze. U obou výše zmíněných typů produktů byl prokázán pozitivní vliv na míru opotřebení a míru poškození povrchu, zatímco významná redukce hluku byla dosažena pouze v případech, kdy došlo ke značnému poklesu adheze. V závěru této práce jsou uvedena doporučení pro další výzkumné aktivity v této oblasti.
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Dynamic vehicle-road interaction
Svršek, David ; Blaťák, Ondřej (referee) ; Fojtášek, Jan (advisor)
Bachelor’s thesis, Dynamic vehicle-road interaction, deals with a summary of basic knowledge about the acting force and factors that affect interaction of vehicle with surface. The work is divided into six parts, which deals with the definition of basic concepts and characteristics of dynamics, traction vehicle, braking, maneuverability, the chassis aspects influencing the traction and anti-skid road surface properties.
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Frame of lift
Seják, Jiří ; Pokorný, Přemysl (referee) ; Mynář, Břetislav (advisor)
This bachelor´s thesis is oriented around several parts of electrical traction passenger lift. The main task is to design the conception of lift frame for the lift machine Sassi Toro with a deflector for a loading capacity of 1000 to 1600 kilos. It´s necessary to make a calculation of traction on driving sheave of machine. On the base of these values we are able to asses a maximum ropes distance between the driving sheave and deflector.
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Personal elevator for a residential building
Moravec, Josef ; Poledna, Jan (referee) ; Pokorný, Přemysl (advisor)
Master’s thesis deals with application of new suspension means for personal elevator instead of conventional steel wire rope includes calculation of traction. Followed by assessment of passive resistance generated by guiding elevator on guide rails and caused by various locations of suspension and guiding (car guide rails). In the last part of thesis contains a strength analysis of car frame by Finite elements method (FEM) in programme NX I-deas.
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Tethered cord syndrome
Pešicová, Anežka ; Bitnar, Petr (advisor) ; Demeková, Júlia (referee)
bakalářská práce Syndrom fixované míchy Bibliographic identification PEŠICOVÁ, Anežka. Tethered cord syndrome. Prague: Charles University, 2nd Faculty of Medicine, Departement of Rehabilitation and Sports Medicine, 2023. 79 p. Supervisor PhDr. Petr Bitnar Ph.D. Abstract Tethered cord syndrome is a neurological condition in which either the spinal cord is anchored by thickened filum terminale or is creating adhesions with surrounding spinal tissue. Progression of such condition leads to paresis of the lower limb, back pain, scoliosis or urological dysfunction. The goal of this thesis was to create a research of available informations about tethered cord syndrome and to explore possible potentials of physiotherapy treatment. Based on the thesis findings emerged a significant potential of manual therapy while treating patients with the tethered cord. In the case study patient with tethered cord was observed over the corse of 6 months and was educated to do autotraction of the spine daily. Changes of the patient's clinical picture were evaluated based on selected standing stability parameters and measured using the Zebris FDM Tredmill system. While the control assessment a significant improvement of all the measured parameters was observed. Such result suggests a favourable effect of traction to the tethered...
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Activation of abdominal wall and back muscles during exercise with traction and compression loads
Jordáková, Adela ; Čech, Zdeněk (advisor) ; Machač, Stanislav (referee)
We used RUSI (rehabilitative ultrasound imaging) for measurement of abdominal and back muscle in different loading modes. Methods: We used diagnostic ultrasonography imaging for taking linear measurement of trunk muscles. We measured anterioposterior (AP) dimensions of lateral abdominal wall muscles- m. OE, m.OI, m.TrA and cross-section area (CSA) of lumbar m. multifidus. We compared two groups of sports-floorball players and sportsman using climbing and hanging (climbers, aerialists). We measured positions with compressive force (kneeling on all four with lifted knees) and with traction load (hang with upper limbs with flexion of lower limbs-with leg support and without). Study is made on 50 volunteers. Results: The pattern of thickness of abdominal muscles is same in all positions in both groups. The lowest is always AP thickness of m. TrA, wider is m. OE and the widest always m. OI. The resting thickness are in both groups almost in all cases the lowest. AP thickness in m. TrA in floorball players is only exception, there is lowest in hang without legs support. In all other case sis resting position always lowest. For m. OE are results same for both climbers and floorball players-the lowest thickness is in hang with legs support (floorball players 0,84 cm, climbers 0,87), greater activationis...
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Single railway electrification system design
Svoboda, Ondřej ; Radil, Lukáš (referee) ; Pelc, Jiří (referee) ; Drápela, Jiří (advisor)
The main topic of the thesis is the design of single-track electrification of a direct current system of 3 kV and an alternating current system of 5 kV 50 Hz and then economically evaluate it over a period of 30 years. The work deals with basic traction systems and also deals with the calculation of main parameters of electric trains. The thesis describes in detail the procedure for the design of the electrification of the track and a partial introduction to the simulation programs that were used for energy calculations.
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