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Hybrid Energy Harvesting Device
Rasocha, David ; Rubeš, Ondřej (referee) ; Hadaš, Zdeněk (advisor)
This bachelor theasis is focuses on the design of a hybrid piezoelectric vibratory genera-tor. The main idea is to place a permanent magnet on the end of the piezoelectric beam and to place the coil appropriately in order to make a electromagnetic generator. The coil will generate a electrical voltage on load, when the magnetic field is passing throught coil. The piezoelectric beam will also generate voltage, depending on its deformation. For modeling, Femm, Matlab and Simulink will be used.
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Influence of the electron beam trajectory on the surface properties of steel 42CrMo4
Mikuš, Tomáš ; Kouřil, Miloslav (referee) ; Foret, Rudolf (advisor)
The thesis deals with surface quenching of steel 42CrMo4 by electron beam. Influence of technologic parameters and beam deflection on properties and structure of prepared layers is studied. Electron beam surface quenching was applicated with and without melting of the surface. Structures of layers made by electron beam quenching were compared with structures made by laser and electromagnetic induction. Structures and phases were analysed by optical microscopy, SEM and roentgen diffraction. Hardness was measured on hardened layers.
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Elektromagnetická indukce: 3-D modelování nespojitou Galerkinovou metodou
Čochner, Martin ; Velímský, Jakub (advisor) ; Souček, Ondřej (referee)
This work deals with numerical modeling of electromagnetic induction in 3D environment with heterogeneous conductivity. We develop a program to solve Maxwell's equations in quasistatic approximation by using Continuous and Discontinuous Finite Elements. Their implementation in the numerical library deal.ii is discussed. The obtained numerical results are compared with each other and also with a quasianalytic solution for an environment with 1D heterogeneous conductivity. We discuss different numerical methods, limits of our code for practical use and possible future enhancements.
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Coilgun
Kovařík, Martin ; Pavlík, Michal (referee) ; Šteffan, Pavel (advisor)
This bachelor’s thesis describes the design and construction of electromagnetic gun for testing projectiles from different ferromagnetic materials with maximal power 19 J. Conventional projectile propulsion mechanisms include the use of compressed air or explosion which places theoretical limits on the maximum muzzle velocity limited by laws of thermodynamics. The electromagnetic coil gun, explores the use of electromagnetism in accelerating projectiles which offers a much higher theoretical limit on muzzle velocity. In addition of an electromagnetic acceleration is possible to regulate output velocity/energy of projectile, and acceleration applied on projectile.
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Induction heating for small applications
Hrbáč, Lukáš ; Foral, Štěpán (referee) ; Krbal, Michal (advisor)
This bachelor’s thesis covers the topic of induction heat and possible solutions for small applications. There is theoretical knowledge needed for design of an induction device and also principles of induction heat. In the thesis, there is described resonant circuit, which is the main part of induction heating device. Furthermore, usual interpretations of driver and power circuits are analyzed. This work describes different ways how to adjust operating frequency to achieve better results. This thesis also includes verification of functionality of such a device, measurement of operating parameters and efficiency. Instructions for laboratory exercise dealing with induction device are attached in the appendix.
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Velocity pickup
Konečný, Jan ; Pikula, Stanislav (referee) ; Beneš, Petr (advisor)
This bachelor thesis deals with a proposal of a sensor for measuring relative oscillation of two interacting surfaces. The thesis describes two possible solutions with their advantages and disadvantages, and a patent research. The main part of this bachelor thesis concentrates on inductive position sensor – its attributes and practical proposal.
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Redesign of mechatronic system for presentation of damped oscillation
Hanuška, Rostislav ; Březina, Lukáš (referee) ; Hadaš, Zdeněk (advisor)
This thesis deals with mechatronic system design intended for demonstration of oscillation with electromagnetic damping for the purpose of its practical use in classes. A part of this thesis is also introduction to issues related to solids vibration and damping. Then a simulation model will be created in MATLAB/Simulink where required parameters of the damper will be selected, and also there is a design of the whole system. Finally, a comparison of response to initial deflection to real fabricated construction.
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Oscillatory Power Generator Base on Mechanical Resonant Element
Mihalík, Vlastimil ; Houška, Pavel (referee) ; Hadaš, Zdeněk (advisor)
This work deals with the power supply of wireless sensors. When using a wireless sensor is desirable application of alternative energy sources, because the primary cells or batteries may reduce the extent or length of service of the sensor itself. Ambient energy can be used as a suitable alternative source. This energy must be in an appropriate form, which allows its conversion to electric energy. These appropriate, already used types include: solar en., temperature gradient en., en. of flowing liquids, vibration, etc. The advantage of vibrations is its presence in almost all mechanical systems. One of the possibilities for using the vibration of machine systems for power supply wireless sensors is using the vibration power generator with oscillating component. The generator must be designed so that its resonance frequency coincides with the frequency of vibration in the machine system. This method can be used only if the machinery system vibrations at least partially constant. Another option is to use the vibrations caused by, for example, transit transport, or different step acting factor. In this case, it is desirable that the generator is designed with variable resonant frequency, which can partly be achieved, for example, integrating several oscillating component in the body of generator. After the general analysis of the problem, graduation theses will be concerned with the possibility of use of energy from the short damped oscillation and step impulse. Focusing on a proposal of multi-element structures.
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Mechatronic Proposal of Electromagnetic Vibration Power Generator
Jurosz, Pavel ; Houška, Pavel (referee) ; Hadaš, Zdeněk (advisor)
This thesis deals with modifications to the construction of vibration-to-electricity energy converter, which is one of possible solutions to problem of sustainable and stable energy source for wireless sensor supply. Upon the exploration of the present state of this problem, new construction of generator is proposed. The aim of this proposal is to enhance the existing generator properties with respect to retention of its dimensions and its weight. Results obtained by simulations of model with proposed parameters are presented and analysed.
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