Os novos materiais utilizados nas estruturas de aeronaves, mais leves e flexíveis, tornam estas estruturas mais sujeitas a fenômenos aeroelásticos, sendo que o mais sério deles é o flutter, que deve ser cuidadosamente investigado com uma boa campanha de ensaios em vôo durante o desenvolvimento e certificação da aeronave. Este trabalho propõe um projeto conceitual de um excitador de flutter que atenda às necessidades dos ensaios, tentando resolver problemas encontrados nos modelos utilizados comumente. Para isso, é feita uma revisão da literatura pertinente, apresentando conceitos de ensaios em vôo e do fenômeno em questão, além de apresentar um histórico dos ensaios e modelos de excitadores utilizados ao longo da história. Em seguida, são apresentados alguns conceitos de excitadores, que são dimensionados e analisados segundo suas vantagens e desvantagens para finalmente escolher o modelo mais pertinente visando no futuro um projeto detalhado, construção e testes em túnel de vento. / The ultimate materials used in aircraft structures, lighter and more flexibles, make these structures more susceptible to aeroelastic phenomena including flutter, the most dangerous of all. This kind of phenomena must be carefully investigated with satisfactory flight test campaigns during the aircraft development and certification. This work proposes a flutter exciter conceptual design that attends the test necessities, trying to solve problems found in the models used actually. So, a bibliographic revision is done, presenting flight test concepts and the studied phenomena, regarding a flight test history and the exciter models used through the years. Finally, some exciter concepts are presented, dimensioned and analyzed considering their advantages and disadvantages in order to choose the most pertinent model, considering, in a near future, the detailed design, manufacturing and wind tunnel tests.

Presented diploma thesis is dealing with study of exciters of anhydrite binders. Theoretical part is dedicated to study of available domestic and foreign literature on a given topic. Attention is also paid to the study of the current research at the institute of THD. In the experimental part is developed a proposal of potential exciters of hydration on the basis of literature and according to the results of the research at the institute of THD. Next is proposed the methodological concept of the work. Testing of the monitored technological features follows. The study of the hydration process was recorded using XRD analysis and thermal analysis. Evaluation of the results was implemented by the mutual comparing of prepared recipes.

This Diploma Thesis deals with the research and advancements in the field of sulphate binders, especially the anhydrite binder. The theoretical part of the thesis is dedicated to the fundamentals of sulphate binders and anhydrite binders. Its second part also introduces standard requirements for screed coatings together with technological methods of their application. Practical part of the thesis looks at the research and production of anhydrite binder with special emphasis on self-levelling compounds. Various types of plasticizers were used in these compounds and their effectiveness and final product quality are compared.

The presented work deals with the study of hydration processes anhydrite binders with external exciters. Work is divided into two parts. Conceptually is this work divided into two parts The theoretical part of study contains general theory of gypsum binders, anhydrite binders and research at the institude THD. In the experimental part deals with proposal of recipes, making of samples and subsequent determination of main technological tests and monitoring hydration process by the XRD and DTA analysis.

This master´s thesis is dealing with the theory of Li-ion accumulators and theirs charching. In this thesis has been designed accumulator tester for automatic charging and discharging of Li-ion accumulator. This tester is controlled by microprocessor.

Diploma thesis deals with design of semimobile device for sorting sand and describes design of machine parts. This thesis includes checking calculations of selected structural elements and final verification of calculations and measurements.

This diploma thesis deals with influence of modifying additives on achieved properties of anhydrite binders. The first part is focused on funamentals of anhydrite binders. Ist second part introduces anhydrite under-layments and their standard requirements. The experimental part is dedicated to anhydrite binders modyfyied by plasticizers, while their final properties are compared.

The aim of this study is to measure and analyze vibrations on a fast response brushless exciter (FRBE) at a real hydropower plant and identify vibration origins through frequency analysis. Moreover, the observed vibrations are evaluated in relation to generator vibration standards and estimated tangential eigenfrequencies of the studied FRBE. It is concluded that the pulsations in the air gap torque, originating from the rotating thyristor bridge rectifier, is the source of the strongest vibrations. Some additional vibration sources are also identified. The requirements of the generator vibration standards are mostly fulfilled and no tangential eigenfrequencies are triggered in the vibration recordings. For further studies it is recommended that alternative control strategies and optimization of the FRBE mechanical design, with respect to its ability to withstand vibrations, should be investigated.

This diploma thesis deals with the study of the binder mortar based on calcium sulphate. The theoretical part deals with the general theory of sulfate binders and anhydrite mortars. Further attention is paid to the standard requirements for these binders and mortars and the evaluation of the existing research at the THD Institute. The experimental part is devoted to research of anhydrite mortar for the production of self-leveling mixtures. The subject of the research was the design of a suitable activating agent, performing technological tests on designed anhydrite pastes and mortars and monitoring hydration.

This diplom thesis theoretically deals about principle of pulse welding current source. Work explains operation principle of the single acting transmit converter used in realized construction and mention the others examples of converters types. Goal of the work is design individual parts of source : input filter, pulse transformer, output inductor and power semiconductors components. Thesis also contains description of the regulation circuitry of the converter, auxiliary power supply and pre-driver for power transistors. If everything will be all right prototype of the source will be assembled and measured. Results will be compared with theoretical assumptions.