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Calibration of the test stand MZGS-200 and the monitoring of fatigue experiments using LabVIEW
Klus, Jakub ; Doložílek, Miroslav (referee) ; Slámečka, Karel (advisor)
This bachelor work concerns with the calibration method of the fatigue test stand MZGS-200, monitoring of fatigue experiments and analyzes signal retrieved from tenzometers. Work includes theoretical derivation of the equation describing force acting on the specimen. Two programs in LabVIEW environment were developed for calibration and measurements. The functionality of those programs was veried during fatigue experiments on specimens made of nickel-based superalloy Inconel 713LC. The measurements of mechanical loading by means of tenzometres were compared with optical measurements using noncontact laser sensor optoNCDT.
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Digital modeling of the orchestra sound
Puczok, Daniel ; Pellant, Karel (referee) ; Doložílek, Miroslav (advisor)
This report is guide along simulation of sound sources and orchestra. Basic physical characteristics necessary to the simulation of sound sources are described here. Description of the creation of directivity files in ODEON and theirs conversion from CATT-Acoustic to ODEON are described here too. Acquired directivity files were used for simulation of orchestra and for testing the directivity characteristics to room acoustics parameters.
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Comparison of noise generated by differently constructed vents
Bernard, Jan ; Doložílek, Miroslav (referee) ; Jedelský, Jan (advisor)
This diploma thesis deals with comparing noise levels of three side vents of different constructions, which are used for distribution and directing of ventilation air in a cabin of an automobile. The fundamental knowledge of the physical and physiological acoustics is described in the introduction part of this study. Following the introduction part there is a brief explanation of the car air conditioning system (HVAC system) as well as are explained the acoustic properties of specific elements of this system. The study also deals with dividing ventilation vents and describes the vast traceable types of automobile vents. Prior to the description of the experiment, which was conducted as a part of this study, the procedures and results of the measurements carried out in other theses are explained. Measurement of noise levels of the compared vents was carried out in a semi-anechoic chamber under the ČSN ISO 3475 standardization. To clarify increase of noise generated by the vent in an interior of an automobile, additional measurement of noise was carried out in a cabin of Porsche Cayenne 2018. From the gathered results we can conclude that under the constant flow, (of 60 square meters per hour) louder vents are those with higher pressure loss. This pressure loss is dependant primarily on the speed of the flow in the vent, as well as on the number and the adjustment of the deflectors. In a cabin of an automobile, the noise produced by the vent is negligible in comparison with total noise in an interior of a car. However, in the area surrounding the air flowing out from the vent, (approximately 0,7 meters from it) the level of acoustic pressure increases significantly.
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Comparison of noise generated by differently constructed vents
Bernard, Jan ; Doložílek, Miroslav (referee) ; Jedelský, Jan (advisor)
This diploma thesis deals with comparing noise levels of three side vents of different constructions, which are used for distribution and directing of ventilation air in a cabin of an automobile. The fundamental knowledge of the physical and physiological acoustics is described in the introduction part of this study. Following the introduction part there is a brief explanation of the car air conditioning system (HVAC system) as well as are explained the acoustic properties of specific elements of this system. The study also deals with dividing ventilation vents and describes the vast traceable types of automobile vents. Prior to the description of the experiment, which was conducted as a part of this study, the procedures and results of the measurements carried out in other theses are explained. Measurement of noise levels of the compared vents was carried out in a semi-anechoic chamber under the ČSN ISO 3475 standardization. To clarify increase of noise generated by the vent in an interior of an automobile, additional measurement of noise was carried out in a cabin of Porsche Cayenne 2018. From the gathered results we can conclude that under the constant flow, (of 60 square meters per hour) louder vents are those with higher pressure loss. This pressure loss is dependant primarily on the speed of the flow in the vent, as well as on the number and the adjustment of the deflectors. In a cabin of an automobile, the noise produced by the vent is negligible in comparison with total noise in an interior of a car. However, in the area surrounding the air flowing out from the vent, (approximately 0,7 meters from it) the level of acoustic pressure increases significantly.
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Determination of sound power levels of heating equipment by measurement of the acoustic intensity
Wagnerová, Klára ; Doložílek, Miroslav (referee) ; Jedelský, Jan (advisor)
This thesis concerns method of determining sound power level of heating devices from acoustic intensity as a primary measured value. Thesis describes the characteristics of acoustic parameters and principles of acoustic measuring. Method of measurement at discret points according to ČSN EN ISO 9614-1 is compared with measurement by scanning according to ČSN ISO 9614-2. Methods are evaluated teoreticly as well as practically by companing results of experimental testing. Thesis also includes description of created model which evaluates acoustic measurement acording to the definitionof point method. The model is designed for measuring chain of Engineering Test Institute, Public Enterprise (SZU).
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Digital modeling of the orchestra sound
Puczok, Daniel ; Pellant, Karel (referee) ; Doložílek, Miroslav (advisor)
This report is guide along simulation of sound sources and orchestra. Basic physical characteristics necessary to the simulation of sound sources are described here. Description of the creation of directivity files in ODEON and theirs conversion from CATT-Acoustic to ODEON are described here too. Acquired directivity files were used for simulation of orchestra and for testing the directivity characteristics to room acoustics parameters.
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Calibration of the test stand MZGS-200 and the monitoring of fatigue experiments using LabVIEW
Klus, Jakub ; Doložílek, Miroslav (referee) ; Slámečka, Karel (advisor)
This bachelor work concerns with the calibration method of the fatigue test stand MZGS-200, monitoring of fatigue experiments and analyzes signal retrieved from tenzometers. Work includes theoretical derivation of the equation describing force acting on the specimen. Two programs in LabVIEW environment were developed for calibration and measurements. The functionality of those programs was veried during fatigue experiments on specimens made of nickel-based superalloy Inconel 713LC. The measurements of mechanical loading by means of tenzometres were compared with optical measurements using noncontact laser sensor optoNCDT.
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