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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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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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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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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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Technology of thrust bearing steel cages production
Jež, Marek ; Štroner, Marek (referee) ; Rumíšek, Pavel (advisor)
JEŽ Marek: Technology of thrust bearing steel cages production . Diploma assert of daily magisteral´s studies, study programme – Industry. The branch manufactoring technology, 2 end form, level 2 – summer semester, study group 50 / 51, academical year 2007 / 2008. FSI of Brno University of Technology, department of forming and plastics, May 2008, 78 pages, 54 pictures, 6 supplements. The main theme of the Diploma Theses is the technology of production of tin cages for axial spherical-roller bearings. The given matter includes the production of tin cages for axial spherical-roller bearings – by traction, cutting, punching and calibration. For the chosen representative, i.e. bearing with marking 29 336 M I suggest the substitution of tin cage instead of the brass one. The component (cage) is made of the sheet iron 11 300 of 4 mm thickness, the basic semi product is the sheet panel with the size of 360 x 4 x 3000 mm. In solving the given matter, it is started from the fact that the current state of the cage is still under development. The aim of the Diploma Thesis is to choose the representative, suggest the appropriate technological progress, proposing the engineering design of functional parts of the tool for punching the holes/windows including the necessary calculations and workshop graphical documentation.
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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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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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Nursing care about child with traction
HEIMLICHOVÁ, Blanka
This bachleor work being titled ?Nursing care of children with traction? consists of two sections. The first section deals with theory, i.e. it represents a theoretical part which focuses on anatomy of bones, specific fractures of children?s fractures, children's accident frequency rate, diagnostics and fracture therapy, nursing process, hospital schools and volunteers at children?s wards. The second section deals with research. For the purpose of the research two goals have been established as well as four research tasks. The aim of this work is to find out specific features of the nursing care of the children with traction and to find out the possibilities of making children with traction busy during children?s hospitalisation period. The research tasks having been set are as follows: Has nursing care of a child with traction any specific features? What are the specific features of nursing care of a child with traction? Is a child with traction encouraged in his/her self-serving activities by nursing personnel? Are volunteers an integral part of a team providing nursing care services for a child with traction? In this work qualitative research has been applied. The data have been processed by means of half-structured interviews with children on traction, their mothers and sisters providing health care services for the abovementioned children and by hidden observations. The interviews consisted in 30 questions for nurses and 20 questions intended for both hospitalised children and mothers being hospitalised together with their children. From the data having been obtained from the interviews case reports have been made and the questions from the interviews have been recorded to the form of matrices as well as the results from hidden observations.On the basis of the results evaluations the responses and answers regarding the questions having been put to executive questions the following conclusions have been made: The nursing care of children with traction has shown specific features in the care of the children?s epiderms. The nursing care of the children with traction has shown its features in the area of hygiene.A child with traction is encouraged and supported in self-serving activities by nursing personnel.The children have been educated regarding suitable and unsuitable moving actions of their limbs. The nursing care of the children with traction has shown its specific features in the area of physiotherapy.The children with traction are integrated in the hospital school curriculum.An integral part of the care devoted to a child with traction is making them take up free time activities in the course of a day in which not only the volunteers, and pedagogues from hospital school and after-school care centre are participating but also the children?s parents. The aforementioned volunteers are an integral part of the team taking care of the children with traction.The nursing care of a child with traction has its specific features. The nursing care of a child with traction is provided by multidiscipline team that besides doctors of medicine and professional nurses within the scope of medical treatment process has been joined by physiotherapists, social workers, psychologists, pedagogues from hospital school a after-school care centre, volunteers, play and game specialists or the parents of the hospitalised children.The results of the above specified research have been summarized into a manual dealing with nursing care of a child with traction intended for parents and it will be offered to the parents of the children with traction in order to make understanding of the therapy easier for the parents and provide the parents with quality nursing care. The results will be published in an article in the professional magazine for nurses.
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