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Travelling and lifting mechanism
Kukla, Antonín ; Malach, František (referee) ; Malášek, Jiří (advisor)
The main objective of the thesis is to design and construct a taxiway and a lifting device for moving a BELL helicopter with slides. Handling equipment is used for transporting helicopters between the airfield and hangars. The thesis is divided into several parts. The first part includes the design of taxiway and lifting equipment. Other parts contain strength calculation of selected parts and design documentation, which includes assembly drawings and important groups drawings.
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Propagation of inclined cracks to the interface of ceramic laminates
Novotná, Lenka ; Trunec, Martin (referee) ; Chlup, Zdeněk (advisor)
Composite materials with laminated structure provide advantages which are utilised during component design. Low density, temperature and chemical stability are the profitable properties predetermining application of ceramic laminates. The main obstacle for wide spread of ceramic materials is their inherent brittleness. Therefore, in this thesis, the crack propagation in ceramics laminates has been extensively studied. Laminated structures with various volume fractions of components (alumina and zirconia) were prepared by electrophoretic deposition. Evaluation of crack propagation through the interface and determination of basic mechanical properties was conducted on the basis of extensive literature search. Crack deflection originated in both presence of internal stresses and differences in elastic modulus during the crack interface passing was monitored. A special type of specimen geometry was employed with the aim to set arbitrary angle between crack and interface. It was experimentally found that the degree of crack deflection is dependent on entering angle and volume fraction of components. Higher crack deflection was already found in the bulk of the test piece comparing to the test piece surface. The 3D fracture surface reconstruction generated using laser confocal microscopy was used in this detailed crack propagation study. Further basic elastic and strength characteristics of laminates were determined and compared to those obtained from monolithic materials. The validity of the mix rule for elastic characteristics was confirmed by comparing of elastics modulus. The most reliable method for elastic modulus determination was marked the dynamic resonance method due to low scatter and consistency in measurement. The flexural strength of all laminates tends to be close to the flexural strength of the weakest component. Therefore the mix rule is not applicable for flexural strength estimation on the contrary of elastic characteristics. The change of component volume fraction leads only to change of flexural strength scatter. Thanks to gained knowledge about crack propagation and basic characteristic determination will be possible to design ceramic laminates more efficiently for given needs of application.
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Ramps for trailer for buildings machines transport
Dvořáček, Michal ; Ješina, Miroslav (referee) ; Škopán, Miroslav (advisor)
The aim of my dissertation on the subject of raids on trailer for transport of construction equipment is to propose a functional concept of rear split folding ramps for trailer construction machines with tracked and wheeled landing gear. Raids are designed as a two-part, hydraulically tilting. With an appropriate mechanism to ensure a correct function of the ramp end part at tilting. Maximum weight of the machine is 21 000 kg and departure angle is 10 °. This thesis was composed with cooperation SVAN ltd.
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Travelling and lifting mechanism
Bernard, Vladislav ; Malach, František (referee) ; Malášek, Jiří (advisor)
The thesis deals the design and calculation of handling equipment designed for transport of Bell helicopter between the airport and hangar space. The first part contains an analysis of possible mechanisms applicable to the handling of the helicopter as well as an overview of the overall evaluation of some producers, engaged in the manufacture of this type of device. The second part presents the design, necessary calculations and drawing documentation. Handling equipment is designed for loading kapacity of 2000kg with a minimum 80 mm lift of helicopter to ensure safe transportation to the required distance.
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Multimedia communication
Vondra, Zdeněk ; Horný, Stanislav (advisor) ; Skrbek, Jan (referee) ; Jurášková, Olga (referee)
Multimedia is a form of communication and sharing knowledge using synergic effect of parallel connected communication channels. Its main use is in producing communications products and services and in design of user interfaces. Main objective of this dissertation is to develop and create a model of multimedia communication for better understanding of the meaning and the purpose of using multimedia forms in communication process. The model will describe a system of elements and parameters of multimedia communication within the internal and external context. Another objective of this dissertation is to develop multimedia communication methodology that will be used for the design, development and evaluations of concepts of multimedia communication. The methodology will be created by applying the model of multimedia communication into the procedure structure. In theoretical way this dissertation is based on analysis of different definitions and approaches to the multimedia communications topic. This is followed by an analysis of communication theories, concepts of media, multimedia, delivery channels, and communication functions. The theoretical part is followed by the outcomes of the research in practice of four different fields of multimedia use. The knowledge gained is analyzed in the following parts in purpose of creating the model of multimedia communication and the methodology which is derived from the model. The methodology is further validated through case studies and the recommendations for further development are formulated. The model and the methodology of multimedia communication created in this dissertation present complex view on multimedia communication topic that is considered as a useful tool for meeting a specific communication purpose. Dissertation provides mechanics for use and study of multimedia communication and also defines the opportunities for further development of the methodology.
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Alternative drives lifting mechanism for pallet truck
Korčián, Michal ; Wilda, Libor (referee) ; Škopán, Miroslav (advisor)
This thesis discusses the design replacement solution current hydraulic actuator stroke for low-lift truck to be completely electric. The aim is to propose the most optimal compensation due to the conservation of existing properties. To use this truck transportation in industries where the emphasis on increased health protection from potential leaks operating fluids.
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