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Verification of nonlinear material models
Holada, Jiří ; Kala, Jiří (referee) ; Hradil, Petr (advisor)
The thesis deals with the verification of nonlinear materials during a dynamic test. The reinforced concrete beam is subjected to an impact load. The deterministic finite element model will be developed using several nonlinear material models. The last part describes the sensitivity analysis with MOP (Metamodel Optimal Prognosis).
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Mechanical analysis of the subsystem of the tower crane
Urbánek, Roman ; Venský, Jiří (referee) ; Fuis, Vladimír (advisor)
The bachelor thesis deals with the solution of a subsystem of a tower crane with a passive effect (NNTP). First part describes tower cranes and their parts. The following part is a description of the theoretical and physical laws of statics and dynamics. In the practical part, various states of motion of a specific modeled subsystem are calculated, which shows a trolley of the tower crane. The aim of the calculation of each configuration is to determine the numerical values of the contact forces in the links, to analyze the dynamic quantities and to evaluate the functionality of the links. Numerical values of unknown parameters were calculated by solving a system of linear equations in the calculation software Matlab.
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Control of linear drives HIWIN
Roman, Jan ; Kaván, Martin (referee) ; Houška, Pavel (advisor)
The diploma thesis deals with three phase linear synchronous electric motors mounted on linear drive, its system of sensors and control. The analysis of working principle and classification of linear motor was done in the beginning part; analysis of the drives sensors system was made in the following chapter. The thesis also deals with the driver from the automation point of view, its tuning and behavior according to high dynamics and precise positioning. The last chapter discusses the issue of controlling two linear drives. Whole thesis was realized on a borrowed linear motor with driver from HIWIN corp.
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Precision and dynamics of linear piezo motors
Ilichman, Ondřej ; Vaške, František (referee) ; Houška, Pavel (advisor)
The work deals with the design, control, precision and dynamics of linear piezoelectric motors from PiezoMotor Uppsala AB. The aim of this thesis is to evaluate the applicability of the loaned engine in a mass spectrometer. In introduction‘s section of this work is discussing the design principles of functionality, materials used, procedure and types of piezoelectric motors. It focuses the choice of hardware and design of mechanical assemblies, which could replace the current mechanism with electromagnetic motors. Then we designed and fabricated a test report with hired piezoelectric motor. In NI LabView development environment is created test application for control and measurement. The final section is devoted to a summary of the positive and negative features of the hired piezoelectric motor and evaluation of accuracy and dynamics.
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Library for Rigid Body Dynamics
Moravčík, Libor ; Janoušek, Vladimír (referee) ; Peringer, Petr (advisor)
This thesis sums up a basic knowledge about rigid body simulations in two dimensional space of computer games.Practical result is a hands-on library written in C++. Collision geometry of rigid bodies is simplified to convex polygons and circles. Multiple bodies can be joined together via a joint. Collision detection is split in to two phases, broad and narrow. Broad phase is implemented using a dynamic aabb tree while narrow phase uses Gilbert-Johnost-Keerthi (GJK) algorithm with Expanding Polytope Algorithm as an extension for detecting collision points between two polygons.
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Vehicle Kinematics and Dynamics Simulations
Zháňal, Lubor ; Bauer, František (referee) ; Píštěk, Václav (referee) ; Kaplan, Zdeněk (advisor)
This paper focuses on the kinematic and dynamic numerical simulation of mechanisms by applying a numerical method, and a complex simulation programme built on it, developed by the author. Described are mathematical principles of the numerical method used and also the programming progression of the important parts of the application and its optimization. The final part includes comparative measuring of the accuracy and performance.
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Audio amplifier with digital input and power and headphone output stage
Abrman, Milan ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
The aim of this thesis is design and construction of amplifier for high quality home listening experience. Device is able to process both analogue signal and high sampling frequency digital input with high audio bit depth. Scope of the thesis covers the design of all the functional units: input signal circuit, S/PDIF receiver, D/A converter, high performance class D amplifier and precise headphone amplifier for dynamic sound presentation. Thesis also cover design of all control circuits containing rotary encoder with button input, microcontroller unit, digital potentiometer and segment display.
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Dynamic analysis of structure with seismic loads
Šnajdárková, Jana ; Nevařil, Aleš (referee) ; Vlk, Zbyněk (advisor)
This thesis focuses on creation of two models of high-rise construction - beam and shell. A dynamic analysis is performed on these models. The selected program is RFEM software and the created high-rise construction is Hearst Tower skyscraper, which is interesting for its diagrid system around its perimeter. There is described process of creating both models and associated problems. Dynamic analysis is performed using standard EN 1998-1. There belongs calculations of sufficient number of modal shapes, spectral analysis and time analysis. Then the results are compared on selected point on the both models.
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Stabilization systems of motorcycles
Honek, Bohumil ; Tobiáš, Martin (referee) ; Zháňal, Lubor (advisor)
In terms of this bachelor’s thesis, the author created a comprehensive overview and description of mechanical and electronic stabilizing systems of one-track vehicles. This thesis furthermore deals with the impact of a vehicle’s structure on its stability and riding dynamics and also includes a brief historical development of the individual components. This thesis then offers an outlook into the close future of vehicles’ and similar machinery’s stability, followed by the author’s critical evaluation.
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Design and construction of sensing part of the cimbalon
Nop, Patrik ; Vrba, Kamil (referee) ; Jirásek, Ondřej (advisor)
This term paper focuses on the design of several possible methods of electroacoustic transduction (further called pickup), specifically of virtual strings of the electronic cimbalom. The paper is based on the problems associated with the classical cimbalom’s design, as well as with its method of tone production. For each of the proposed methods I have made use of my own experiences with guitar pickup, laser harp function, MIDI controller capabilities, and the properties of electret microphones. Most of the methods are ones that I developed and tested in practice, some of which I am still working on and will include in my subsequent Bachelor’s thesis.
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