|
|
Vibroacoustic Analysis of the Combustion Engine
Špačková, Jana ; Řehák, Kamil (referee) ; Prokop, Aleš (advisor)
This thesis is focused on vibration and noise diagnostics of a combustion engine. In the range of the current knowledge there is an analysis of measuring devices, units of measure, possibilities of frequency analysis and a combustion engine from the point of view of vibrations and noise. Part of this work is creating a technical experiment where there were measured both vibrations and noise of two combustion engines. From the data it was done a frequency analysis. Conclusion of the analysis is an evaluation of frequencies which occurred on given engines.
|
|
|
Frequency analysis with using optical system
Chlebounová, Klára ; Dvořák, Petr (referee) ; Jebáček, Ivo (advisor)
The goal of this thesis is to create a methodology for measuring vibration on the aircraft construction with using optical system and perform basic frequency analysis. Work shortly discusses the theoretical foundations of aeroelastic phenomenon and methods of solving its own deflection shapes and frequencies. In the practical part is measurement methodology designed for simple vibration of clamped rods and then is applied to a frequency analysis of the wing.
|
|
|
Measurement and analysis of cardiovascular parameters
Filipová, Petra ; Smital, Lukáš (referee) ; Kratochvíla, Jiří (advisor)
This bachelor´s thesis illustrates the basic diagnostic procedures for ECG analysis in clinical practice. It contains the verification of statistical hypotheses, automatic detection of the RR intervals using three different QRS detectors and heart rate from the ECG und other analyses in time and frequency domain. The validation of detection efficiency is investigated. Heart rate variability analyses are shown in time and frequency domain too. Analyses are done in Matlab, the graphical interface in Maltab GUIDE was done too and includes all of the created functions in time and frequency domain. For the purpose of evaluation methods the real data were measured according to the created acquisition protocol.
|
|
|
Scanning a analysing of heart electrical activity and blood pressure before and after the load
Vích, Daniel ; Kolářová, Jana (referee) ; Kratochvíla, Jiří (advisor)
The aim of bachelor’s thesis is familiarization with anatomy and physiology of heart, with setting to electrical activity, scanning EKG before and after the load with Biopac system, scanning of blood pressure before and after the load with auscultation, statistical analysis of acquired data and presentation of measured data in graphical interface Guide of Matlab system. According to the protocol of measurement, scanning of heart electrical activity with the Biopac system, and scanning of blood pressure, with auscultation, was realized before and after the load. Measured data was statistically analyzed with t-test to verify hypothesis, that there is an influence of the load on the watched parameters, and to show the process of statistical verification. Application of this method assumes normal distribution of data, that’s why data was at first tested by Chi-squared and Kolmogorov-Smirnov test to verify their normal distribution. In the next step data was imported into Matlab system. The presentation of measured data is realized in graphic interface Guide. The program contains time domain and spectral analysis, automatic detection of heart rate and analysis of heart rate variability.
|
|
|
Intelligent Test Procedures Low-Tension Traction Drives with Induction Motors
Nesvadba, Martin ; Ondrůšek, Čestmír (referee) ; Novák, Jaroslav (referee) ; Duroň,, Jiří (referee) ; Singule, Vladislav (advisor)
This dissertation thesis is focused on the problem of the noise measurement and construction of the noise test station what was also interest of my employer - company Kollmorgen,sr.o. This testing station should be located directly in the assembly line with target of the noise motor s identification. On base of these measured values and implemented intelligent testing procedures, we should be able to identify real root cause of the noise The noise of electrical machines is actual issue. There is a big pressure for low-noise driving system construction created by many end-customers. We can achieve these requirements with 100% quality of all parts of current product, implementation of noise testing station and also with design optimization of the current product. Basic testing procedures of induction motors were showed in first part of this work (chapter 4.1.). These procedures are able to provide good picture of the motor condition. For the motor noise measurements was constructed a workplace including noise box with acoustical absorption up to 30dB what allowed the workplace implementation directly into the motor assembly line. Testing techniques and frequency analysis procedures were implemented sequentially with the target of the test evaluation improvement. After the detailed analyze of the motor noise root causes was performed check of the current motor design with respect of the “noiselessness” motor construction principles. As next step was created the motor prototype with optimized construction with target of the motor noise reduction. This optimized motor was tested and compared with standard motor design.
|
|
|
Analysis of acoustic and vibration parameters from rail transport
Turčíková, Hana ; Tomandl, Vladimír (referee) ; Smutný, Jaroslav (advisor)
This diploma thesis is focused on operational testing of selected railway lines with different structures of superstructure. For the measurement purposes suitable measuring sections in directional curves on the rail corridors were chosen and suitable measuring methodology was designed. Based on all the tests the dynamic and acoustic parameters of tested structures were determined. For the test evaluations suitable mathematic methods in both time and frequency zone was chosen. Part of my work is also to compare the parameters of the tested structures and to make recommendations for practise.
|
|
|
HRV analysis in the context of daily activities
Indrák, Václav ; Smital, Lukáš (referee) ; Novotná, Petra (advisor)
The aim of this bachelors thesis is to measure ECG recordings on voulenteers, and following analysis of HRV from these recordings. It persues the explanation of basic metrics used to evaluate HRV, used both in clinical and scientific practice and their following programming implementation in Matlab environment to achieve the most accurate results possible, which are than assessed.
|
|
|
Modeling of thin-walled frames mechatronic systems with fillet welds and their influence on the natural frequency
Appel, Martin ; Hadaš, Zdeněk (referee) ; Vosynek, Petr (advisor)
This bachelor thesis is focused on methods of reduction degrees of freedom and their application in mechatronical system. Next part is focused on fillet welds and their modelling in Ansys Workbench software. Individual possibilities of geometry of welds are analysed by modal, static and harmonic analysis. Aim of this thesis is comparison of results of analysis for different methods of geometry of welds. Then it compare results of modal analysis in Ansys Workbench and Adams software. Finally the work deals with possibilities of exporting from Ansys Workbench to Adams, Matlab and Excel software.
|
|
|
Parameter Identification of Permanent Magnet Synchronous Motor
Veselý, Ivo ; Bobál, Vladimír (referee) ; Janeček, Eduard (referee) ; Blaha, Petr (advisor)
The purpose of this dissertation is to design identification methods for identifying a permanent magnet synchronous motor. The whole identification and motor control is carried out in d-q coordinates, and the program used for processing and control was the matlab simulink, together with the real time platform DSpace. The work focuses on two main areas of identification, off-line identification and on-line identification. For offline identification the frequency analysis was used with the lock rotor test to get three main parameters. They are the quadrature and direct inductances and stator resistance. In the online mode, the identified parameters were extended to magnet flux _f identified by MRAS method. The remaining parameters were again identified by frequency analysis, which was adapted into online mode, and simultaneously applied to the identification of several part in one time. The next method is Newton method, which is used for estimating stator resistance of the motor, without the need to apply any signal.
|
|
|
MEASUREMENT OF DYNAMIC PARAMETERS OF TRACK GRID
Podolník, Adam ; Tomandl, Vladimír (referee) ; Smutný, Jaroslav (advisor)
Coupled with theory analyses, various static and dynamic tests carrying out in laboratory or directly on site serve as a basis for selection and comparison of particular rail superstructure parts. It should be noted that the theoretical analysis of the application of mathematical modeling is often based on highly idealized assumptions. The purpose of this bachelor thesis is the experimental analysis of dynamic effects of selected flexible fastening structures without baseplates. Forces induced by the passage of trains have been simulated on a specially prepared samples using inertial exciter. Additional measurements of the dynamic response of structures to shock induced by a modal hammer were also performed. Measurements were performed in the laboratory of ÚPKO and ÚŽKS and in situ.
|
guest ::
