|
|
Travelling and lifting mechanism
Husák, Adam ; Šťastný, Antonín (referee) ; Malášek, Jiří (advisor)
This bachelor´s thesis is aimed on traveling and lifting device designed for transportation of BELL helicopters between tarmac and hangar. The first part is devoted to review and evaluation general producers of similar devices. Furthermore there are analysis of possible mechanisms and subsequent choice of appropriate solution. The second part deals with design solution and calculations. Includes drawing of designed device. This device is defined by load capacity up to 2000 kg and stroke 80 mm.
|
|
|
Study of the properties of concrete with reinforcement, intended for the production of concrete egg-shaped tubes
Šťastný, Antonín ; Hela,, Vlastimil (referee) ; Hubáček, Adam (advisor)
This diploma thesis examines the properties of concrete with reinforcement, designed for the production of a concrete egg-shaped tubes . The stress is put on using various types of fiber reinforcements. Theoretical part is divided into 4 subsections. The topic of the first subsection is a concrete in general. Second subsection deals with various technology of production of concrete pipes. The third subsection is focused on description and summary of basic properties of concrete and reinforced concrete tubes. The last subsection deals with standardized procedures for testing concrete. Experimental part of this thesis is divided into two subsection. First subsection deals with design of a reference sample. Six different samples of a concrete were designed and their rheological properties were tested. Second subsection deals with the additi-on of various types of fiber reinforcement to the reference sample. Eight different admixtures of a concrete were added to the reference sample. Properties of these admixtures were tested in fresh and hardened state.
|
|
| |
|
|
Derrick crane
Kobzík, Martin ; Šťastný, Antonín (referee) ; Malášek, Jiří (advisor)
This bachelor thesis involves the analysis of construction of derrick crane and his design according to set parameters. The thesis contains strength calculations and proposals for major structural elements and important parts of the crane. It also contains a selection of suitable hoists and drawings in the form of a crane assembly and detailed drawing of arm.
|
|
|
Derrick crane
Kuhejda, Lubomír ; Šťastný, Antonín (referee) ; Pokorný, Přemysl (advisor)
This bachelor’s thesis is aimed on construction design of derrick crane for capacity of 1 000 kg, lining length of 4 000 mm and lift height of 4 800 mm. The purpose is to make design of main carrier and function elements including selection of suitable hoist by given requirements. Strength calculation of selected parts was made according to current applicable standards ČSN 27 0103. In the annex of this thesis are also assembly and manufacturing drawings.
|
|
| |
|
|
Vertical bucket conveyor
Holcner, Petr ; Šťastný, Antonín (referee) ; Jonák, Martin (advisor)
This thesis describes design of vertical bucket conveyor (elevator) for vertical transport of grain. The global design elevator is based on functional and capacitance calculation with links to the surrounding area and buildings. Detail of work is focused in design of placement power in elevator head with development of the other designed parts. It is means total placement of drive, the drive shaft and the cylinder in elevator head and method of emptying bucket.
|
|
| |
|
|
Modelling of Load Impacts Acting on Transport and Handling Equipments with the Aim of their Optimization
Šťastný, Antonín ; Hrabovský, Leopold (referee) ; Kuľka,, Jozef (referee) ; Škopán, Miroslav (advisor)
This PhD thesis deals with employment of the state of the art methods of mathematical optimization and structural analysis in the field of load carrying steel structures of handling devices. The goal of the thesis is to compile a methodology which enables generating of optimal dimensions of conceptually designed load carrying parts of handling devices. The proposed methodology is composed of sub-methods which are successively applied to find an optimal configuration of structure according to a chosen criterion. The methodology incorporates sub-methods such as Design of Experiments, parametric finite-element modelling, the state of the art computational methods for stability assessment, mathematical approximation methods and state of the art optimization schemes based of both, heuristic and gradient principle. Recommendations from Eurocode 3 are used to introduce imperfections to the finite element model in order to perform the nonlinear buckling analysis. The practical part of this thesis is focused on optimization of welded beams. The principle of the methodology is in detail explained and demonstrated on an example of lifting spreader beam of load carrying capacity of 20 tons. The proposed methodology is practically realized by an algorithm created in Matlab software. Matlab is also utilized to implement some sub-methods including mathematical optimization schemes. Both, gradient and heuristic optimization algorithms are used for comparison and mutual verification. Structural analysis is performed by means of parametrical finite-element models which are built in the Ansys Parametric Design Language (APDL). The methodology takes into account buckling, which is inherent to thin walled structures under compressive load. The buckling analysis is performed by means of both, linear and non-linear procedures in Ansys. The output of the algorithm is an optimized configuration of the structure, which minimizes the objective function and complies with all requirements implemented in the form of design constraints.
|
|
|
Fatigue analysis and life of steel structures
Dostál, Petr ; Šťastný, Antonín (referee) ; Kubín, Martin (advisor)
The thesis is focused on solutions fatigue´s analysis and consequently on persistence steel structures of engineering and building aspects. The theoretical part describes the influence of cyclic fatigue in steel structures, describe the basic characteristics of fatigue and its application, a description of the fatigue life curves and their subsequent mathematical approximation of both engineering and the building terms. The study also includes the calculation of fatigue real parts (structure) in mechanical engineering, depending on the operating conditions of the structure. The work is further prediction of the life of steel structures using damage accumulation hypothesis according to the nominal stress. The practical part composes an example of life calculation of drawbar tractor-trailer bogie suspension of engineering and building terms. An example serves as an algorithm solving the life prediction of engineering and building terms, and reveals the possibility of solving the life of engineering structures in terms of building. The comparison of both approaches is done in conclusion.
|
guest ::
