|
|
Footbridge over Morava River, Mikulčice - Kopčany
Bílek, Jaroslav ; Konečný, Vojtěch (referee) ; Křižan, Lukáš (advisor)
The topic of my master's thesis is a concept and evaluation of a new steel construction of a foot bridge for pedestrians and cycles across the river Morava. The concept has two alternatives. Option 1: The foot bridge has three spans. The span lengths are 27+81+27m, the middle span is stiffened by an arc. There is a bridge deck that consists of a cellular beam which is locked onto the arc. The bridge deck is lower, steel and orthotropic. The arrangement of rods is radial. Option 2: The middle span is stiffened by two arcs bowed to each other. The bridge deck consists of two beams with crossbeams and is locked onto the arcs. The bridge deck is again lower, steel and orthotropic. The arrangement of rods is radial. The wind bracing has a shape of a Vierendeel beam.
|
|
|
Enhancement of optical diagnostics of the switching arc
Samohejl, Matěj ; Kloc, Petr (referee) ; Valenta, Jiří (advisor)
This master´s thesis si focused on determinig methodology of optical diagnostics of the switching arc using the high-speed camera Photron SA-X2. The thesis contains basic rules for proper setup of the measurement system and the rules to adjust the camera exposure. The experiments were performed on the prototype of a parametric switching chambre, while the majority of source materials was derived from the requirements of another study which was aimed on the movement of the electode spots. The process of the first adjustment of the camera, a record edit options for the presentation purposes and the process of the 3D model design of the switching arc in SketchUp software was stated. Paper contains a comparsion of the spectral filter effect and neutral density filter effect on the final record as well. The part of the work outputs are the 3D model of the switching arc and the supporting record editing software. The paper results show a degree of the inaccuracies in a optical diagnostics made from only one direction caused by the lack of the information about third dimension.
|
|
|
Problems of the Expert Analysis of the Vehicle Movement and Braking Action in General Spatial Curve at Speed Higher than 50 km/h
Panáček, Vladimír ; Šachl, Jindřich (referee) ; Drahotský, Ivo (referee) ; Vémola, Aleš (advisor)
The present apparatus for the technical analysis of road accidents has no well-integrated information, recommendations or procedures of how to solve comprehensively the analysis of road accidents involving vehicles equipped with stabilization system of driving dynamics. The problem in the investigation of a vehicle movement in a curve is the ignorance of the contributions of vehicle dynamics intervention of the electronic stability system. Although some of the simulation software used in the analysis of road accidents makes it possible to take into account the modelled vehicle movement impacted by a stabilization system in the examined process, but the experts do not know what parameters should be entered in the numerical models of stabilization system in a computer programme. Therefore, the thesis investigates the issue of the expert analysis of vehicle riding and braking in a general spatial curve at speeds exceeding 50 kph with simultaneous examining the impact of electronic stability system chassis on vehicle driving dynamics. The thesis first deals with the solutions based on classical analytical methods, then dwells on experimental measurements in real conditions on testing grounds and, finally, addresses the use of computer simulation software in expert practice. Nevertheless, it is important to realize that no computer simulation software can be an absolutely unambiguous solver, and it is not enough to generate a computer simulation, but so obtained results should be evaluated and justified technically. Road accident analyst needs to know the impact of vehicle electronic stability control systems on vehicle movement. The thesis investigated the mutual relationship between the vehicle speed limit in a curve specified by analytical calculation and the vehicle speed in a curve experimentally detected by measuring the parameters of driving dynamics of a vehicle equipped with electronic stability system. The impact of selected electronic stability control systems of the chassis on the vehicle movement in the investigated processes in the curve was detected and quantified by driving experiments. Finally, the input values of significant quantities of computational models of the ESP simulation programs were found consistent with the results of experimental measurements in defined curves for the vehicles equipped with electronic stability systems. The results of the thesis can be used both in the expert and in the teaching activities.
|
|
|
DC arc extinguishing in low voltage switching devices for critical currents
Fencl, Martin ; Šimek, David (referee) ; Píška, Jakub (advisor)
This bachelor’s thesis deals with DC arc extinguishing for critical currents. The first, theoretical part describes and defines an arc, a DC arc and methods of its extinguishing. The second, theoretical part concerns spectral analysis – specifically, the emission method. Methods of research of extinguishing critical currents are also presented. The practical part consists of two measurements. The first measurement consists of spectrum measuring in time, in conjunction with voltage and current measurements. In the second measurement, the goal was to measure the dependence of arc burning time on voltage and current. The thesis concludes with summary of the results of each individual measurement and their presentation in the wider context.
|
|
|
Static verification and variant design of roof structure of winter sport stadium in Znojmo city
Kovář, Jindřich ; Melcher, Jindřich (referee) ; Karmazínová, Marcela (advisor)
The subject of the thesis is the conversion and alternative proposals for the existing steel structure roofing winter stadium in Znojmo. The building has a rectangular shape with dimensions of 84 x 63 m Roof truss structure is formed purlins and trusses girlandovými, vynášenými two steel arches with a span of 84 m variant solution is full board and reduced lattice truss plate. After evaluating both solutions was chosen the first option, which was subsequently designed and assessed according to applicable standards. Truss plate is designed on the original footprint supported the original concrete bearing walls. Eye lattice plate is a square with sides of length 3.5 mA at 3 m Joints are designed truss balls and anchoring pin.
|
|
|
Steel Load-bearing Structure of a Car Showroom and Repair Centre
Thomanková, Lucie ; Buchta, Stanislav (referee) ; Bajer, Miroslav (advisor)
Diploma thesis includes design and examination of steel load-carrying structure. Construction includes car deal warehouse and car repair shop with extension for car varnishing. Car deal warehouse has ground dimensions 22 x 30 m and total high 10 m. Main frame is composed of Vierendeel trusses with arc shape. Car repair shop has ground dimensions 20 x 30 m and total high 10 m. Main frame is composed of truss girders and web-plate columns. Frame extension has ground dimension 20 x 10 m and total high 6,4 m. Cladding is composed of sandwich panels. Store´s gable wall and a part of the roof are glass. Climatic load is intended for locality Ostrava.
|
|
|
Fingerprints Generator
Chaloupka, Radek ; Orság, Filip (referee) ; Drahanský, Martin (advisor)
Algorithms for fingerprints recognition are already known for long time and there is also an effort for their best optimization. This master's thesis is dealing with an opposite approach, where the fingerprints are not being recognized, but are generated on the minutiae position basis. Such algorithm is then free of the minutiae detection from image and enhancements of fingerprints. Results of this work are the synthetic images generated according to few given parameters, especially minutiae.
|
|
|
The Roofing of the Sport Hall
Müller, Radek ; Šmak, Milan (referee) ; Buchta, Stanislav (advisor)
In my project I dealt with a proposal pool roof in the town of Brno. As the main construction material was used glued laminated wood. For affiliate structure was used steel and solid wood. Construction has a span of approximately 40 meters, length 60 meters and a height about 11.5 meters. For a given type of structure and for aesthetic and ergonomic reasons, decided to design a curved beam of glued laminated timber supported by a pillar of glued laminated timber. End of the cantilever beam is supported by a steel column.
|
|
|
Steel foot-bridge
Pauer, Jan ; Barnat, Jan (referee) ; Štrba, Michal (advisor)
The diploma thesis describes the design and assessment of steel footbridge for pedestrians and cyclists across the river Svratka in Brno. As the main material of structural elements was used steel S355. In the beginning is deal with two variants of structural system, which are compared with each other and the better variant is chosen. The main structural system of chosen variant consist of two parabolic arches bend down to each other on which is suspended by suspenders intermediate deck. The deck consist of two steel beams with floor beams and composite cencrete slab. The span length is 50 m.
|
|
|
The steel roof structure of a hall
Havíř, František ; Pilgr, Milan (referee) ; Štrba, Michal (advisor)
The aim of this bachelor’s thesis is to design the steel roof structure of a sport hall in the area of city Olomouc. The plan dimensions of the hall are 55,0 x 35,0 m and height is 15,0 m. The solution is chosen from two preliminary variants. The roof construction is on the cross-section formed by the unbalanced circular arc. The main load bearing structure is created by planar circular lattice frames with height 1,8 m, which are hinged on the columns at one side, and on the other side tailed to the underlying structure. Between main bearing arches are solid purlins, which are radially arranged. Spatial solidity is provided by transverse and longitudinal bracings.
|
guest ::
