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Machining of long cylinders
Nádvorník, Vít ; Jaroš, Aleš (referee) ; Fiala, Zdeněk (advisor)
The bachelor thesis deals with the machining of long cylinders and production machines used for the machining technology. The main part contains a description of the vibration system of machine-tool-workpiece and analyzes active and passive methods of its elimination. It also deals with the wear of the cutting tool and a description of the parameters which have a direct effect on tool life.
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Vibration of faulty bearing depending on the load
Slaninová, Barbora ; Marcián, Petr (referee) ; Krejsa, Jiří (advisor)
The subject of the presented bachelor thesis is an analysis of a bearing vibration during its failure on inner race with varying load. The work aims to create a model simulating the time course of vibrations in the event of a bearing failure depending on the load and speed of the bearing. The work compares the frequency and time model of the rolling bearing error spectrum. A model of bearing error frequencies was also created, which is supplemented by a force action in the next step. To parameterize the model, data were experimentally measured on a bearing that takes on three possible states. The first bearing has a defect on inner race measuring 0.25 mm, the second bearing 0.5 mm and the third is free of defects. The measurement takes place on a test bed in 135 repetitions. Inventor is used to design the bearing with defect. The measured data are processed and visualized with MATLAB. The measured values show that the rate of vibration is not only dependent on the load and speed, but also the size of the defect.
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Noise Reduction Methods in Automotive Design
Kubica, Petr ; Janoušek, Michal (referee) ; Prokop, Aleš (advisor)
The aim of this bachelor thesis is create a research study about noise reduction methods in automotive design. The introduction of this work deals with acoustic and the influence of noise on people. Furthermore it deals with ways of noise creation in a car and its suppression. In the end of this work there is a valorization of certain methods at noise suppression of a personal vehicle.
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NVH parameters determination of gearbox housing
Belák, Kristián ; Prokop, Aleš (referee) ; Řehák, Kamil (advisor)
This master’s thesis deals with determination of NVH parameters of the gearbox housing. Introductory part is focused on the necessary theoretical knowledge. Subsequently, it contains the modal analysis with the computational and experimental approach, which are being compared to each other. In the case of the computational approach, analysis of the influence of bolt pretension on the modal properties is also involved. The thesis continues with the harmonic analysis with the computational and experimental approach, including their mutual comparison. Based on these analyses, design modifications for improvement of the NVH parameters are designed at the end of the thesis, which are being compared to each other and to the original geometry, using the computational approach.
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Noise Reduction Methods in Transmissions
Benda, Matouš ; Zubík, Martin (referee) ; Prokop, Aleš (advisor)
Transmissions are basic elements of cars, which are important parts of everyday life. Expect targeted properties transmissions have a great influence for a total noise emitted by car. This thesis deals with possibilities of reducing this noise. In a first part of this thesis, reader is acquainted with the basic knowledge of acoustics, where are definitions of sound and mentioned noise. Another part analyzes transmission, as a mechanical component formed by smaller machinery units. This description is important for understanding transmission of vibrations in the structure, which further due to vibrate surroundings, which the human ear perceives as noise. These vibrations are mainly generated between meshing gears, and therefore the transmission error, which is responsible for these vibrations is analyzed in the next section. The last part discusses noise reduction methods, partitioned by the transmission components, in which are these methods applied.
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Use of Vibrodiagnostics in Forensic Engineering
Záleská, Veronika ; Bradáč, Albert (referee) ; Panáček, Vladimír (advisor)
This thesis deals with the measurement and evaluation of vibration on selected parts of car. Part of the work is devoted to the theory of vibration and noise, which includes, among others, presentations of common disorders of machine parts in terms of vibration. In the practical part of the work were performed out measurements described here and the results analyzed. Last part is in short devoted to the possibilities of using a similar measurement in forensic engineering.
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