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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Microwave curing of composite material / Mikrovågshärdning av kompositmaterial

Sanjaya, Arief Budi January 2023 (has links)
Microwave curing has become a trend in composite processing due to its efficiency in energy consumption compared to the traditional curing method. However, as commonly found in every composite processing, controlling the microwave curing process remains challenging. The most feasible control method is to build a numerical model. In this report, the numerical model was developed to simulate the microwave heating of cured and uncured glass/epoxy samples. The objective of cured sample simulation was to obtain the average electric field intensity generated in the composite, which was then used in the uncured sample simulation. Meanwhile, three methods of microwave heating to the uncured samples were suggested, i.e. heating with constant electric field intensity, heating with non-constant electric field intensity, and heating with concentrated electric field intensity. The simulation was further expanded by combining microwave heating with contact heating to improve the curing state on the corner section. The simulation showed a reasonable temperature evolution trend for all three microwave-heated methods of an uncured sample. However, they are all different from the experiment result. Meanwhile, a high temperature in the core layer was observed in all simulations with a gradual temperature decline toward the outer layer, as expected from a microwave heated object. Finally, a decent degree of cure was obtained by employing additional contact heating without involving microwaves. / Mikrovågsbaserad härdning har blivit en trend inom komposittillverkning på grund av dess energieffektivitet jämfört med den traditionella härdningsmetoden. Men precis som i all komposittillverkning är det fortfarande utmanande att kontrollera mikrovågshärdningsprocessen. Den mest genomförbara kontrollmetoden är att bygga en numerisk modell. I den här rapporten utvecklades en numerisk modell för att simulera mikrovågvärmning av härdat och ohärdat glas/epoxiprover. Målet med simuleringen av de härdade proven var att få fram den genomsnittliga intensiteten av det elektriska fältet som genereras i kompositen, vilket sedan användes i simuleringen av de ohärdade proven. Samtidigt föreslogs tre metoder för mikrovågshärdning av de ohärdade proven, nämligen uppvärmning med konstant intensitet av det elektriska fältet, uppvärmning med varierande intensitet av det elektriska fältet och uppvärmning med koncentrerad intensitet av det elektriska fältet. Simuleringen utökades sedan genom att kombinera mikrovågshärdning med kontaktuppvärmning för att förbättra härdningsgraden i hörnsektionen. Simuleringen visade en rimlig temperaturutveckling för alla tre metoder för mikrovågsuppvärmda ohärdade prov. Dock skiljer de sig alla från experimentresultatet. Samtidigt observerades en hög temperatur i kärnskiktet i alla simuleringar med gradvis temperatursänkning mot ytterlagret, vilket förväntas hos ett mikrovågsuppvärmt objekt. Slutligen uppnåddes en acceptabel härdningsgrad genom mot sluret addera kontaktuppvärmning utan mikrovågor.
2

Bytový dům / Apartment House

Pražan, Tomáš January 2016 (has links)
The main goal of this diploma thesis „apartment building“ is create project documentation for building construction. This apartment building located in Policka's suburb is designed for 32 people living in 8 apartments. The building is designed as detached house on four floors, without basement. The first floor above the ground is used as a apartment for handicapped people, common rooms, cleaning room, maintenance room, and garages for 5 cars. In the second floor above the ground there are apartments. In the last floor above the ground there are entrance to rooftop and an apartment for 7 people. All floors are connected with staircase and elevator. Bearing and partition walls are lined with ceramic bricks Heluz, heating contact system. Ceiling panel system is designed Spiroll. The roof is flat.
3

Rekonstrukce městského úřadu / Renovation of municipality office

John, Josef January 2017 (has links)
This thesis deals with the reconstruction of the Adamov municipality,based on a solution of barrier-free building use, overall improvement of the energy performance of the building and creation of new office spaces in the form of a loft. The object is located on a building site in the town Adamov. The object is currently connected to a III. road, parking space and utilities. It is a building with three above-ground floors and one basement floor. The ground plan of the municipality is rectangle-shaped, the maximum outline dimensions of the rectangle are 28.38 x 16.70m. Existing vertical supporting constructions are mason made of fired bricks. The roof frame structure is made of wood, construction framework stagnant stool, fired tiles are used as roofing. Floor surfaces are formed by ceramic tiles or vinyl. The entrance part is covered with a flat roof. The entrance area will be redesigned as a barrier-free, with a connection to the elevator that goes through the entire object. The sanitary facilities in the first and in the second floor will be renovated. Newly created attic floor will be – except for the lift - connected to the interior of the building by a new steel staircase and the walls on this floor will be of a light type. Holes fillings will be changed in the perimeter walls. A thermal insulation of the entire object by a contact heating system will take place. This thesis consists of preparatory work and studies, implementing documentation, text reports, calculations of the thermal technical assessment and fire safety solutions. Project documentation is made in accordance with currently valid laws, regulations and standards.
4

Novostavba hotelu Velichovky / The Hotel Velichovky

Kužela, Jan January 2019 (has links)
This diploma’s dissertation is on project of a new hotel building with three aboveground and one underground floors. This study starts at the building stage and focuses on the construction details and energy demands of the building. Also included is a fire safety solution for the new hotel building. The layout and architectural desing is according to the investor´s requirements, with respect to applicable laws, regulations, standards. Traditional materials are designed for the new building, taking into account the latest developments in the construction industry.

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