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	Computational and experimental assessment of natural frequencies in a bladed disk system Mekhalfia, Mohammed Lamine ; Procházka, Pavel ; Maturkanič, Dušan ; Voronova, Evgeniya ; Hodboď, Robert This paper examines the modal characteristics of a bladed disk in rotating machinery systems using a combination of analytical and experimental modal analysis methods. The analysis involves measuring natural frequencies and mode shapes under different operational conditions. A comparative analysis is conducted to assess modal properties obtained from both analytical and experimental approaches, while also considering the influence of rotation speed. Additionally, Finite Element Method (FEM) outputs are used to accurately position the strain gauge. Integrating these techniques provides a comprehensive understanding of the bladed disk's behaviour under varying rotational speeds, enhancing result accuracy and facilitating thorough investigation within rotating machinery systems. Detailed record
	Modification of cooling system for laboratory measurement of rotor blade vibration Maturkanič, Dušan ; Procházka, Pavel ; Hodboď, Robert ; Voronova, Evgeniya ; Mekhalfia, Mohammed Lamine Last year, the replacement of the turbine wheel model was completed in the Laboratory of Rotational Laser Vibrometry of the Institute of Thermomechanics AS CR, v.v.i. Based on previous experience and the expected higher operating load planned for the new wheel, the cooling system was modified at the same time. The paper describes the main effort in this direction and the results that clarify the previous damage of the measuring device. Detailed record
	Verification of the dynamic properties of a new model turbine wheel with free blades Voronova, Evgeniya ; Procházka, Pavel ; Maturkanič, Dušan ; Mekhalfia, Mohammed Lamine ; Hodboď, Robert The paper describes a new experimental model of turbine wheel with free blades. Verification tests were carried out using a Doppler laser vibrometer, with a focus on the equipment parameters under various conditions. The measurements were performed in the Laboratory of Rotational Laser Vibrometry originated at the Institute of Thermomechanics AS CR, v.v.i. Detailed record
	Applications of blade vibration measurements in the laboratory of rotational laser vibrometry Maturkanič, Dušan ; Procházka, Pavel ; Hodboď, Robert ; Mekhalfia, Mohammed Lamine ; Voronova, Evgeniya The Laboratory of Rotational Laser Vibrometry was established at the Institute of Thermomechanics AS CR, v.v.i. in 2015 and the first experiments were started the following year. The measurements are intended for the research of vibration of rotating blades. The paper includes a summary of measurement results using a special turbine model and their consequences in theoretical research, as well as measurements with a real compressor of aircraft engine and comparison with computational analysis. The paper also describes the complex system for measurement and analysis. Detailed record
	Dependence of signal strangth on the radial distance and different types of magnets Procházka, Pavel ; Voronova, Evgeniya ; Maturkanič, Dušan The paper describes dependence of signal strength on the radial distance between the sensor and the measured object and dependence of signal strength on the different types of magnets. The measurements were performed in the laboratory of the rotational laser vibrometry originated at the Institute of Thermomechanics AS CR, v.v.i. Detailed record
	Theoretical Description of Measured Signals for Blade Tip Timing Method and Inaccuracy Definition Maturkanič, Dušan ; Procházka, Pavel ; Košina, Jan ; Voronova, Evgeniya ; Hodboď, Robert The report describes the results of fluctuating speeds measurements for the blade tip timing method. The complications, occured during signal processing, lead to a detailed analysis of the recorded data. Thus, a theoretical description of the signal characteristics was elaborated. The measuremnts include four regimes in two different conditions. In connection with previous report, this report contains an assessment of a verification measurements with software upgrade. Detailed record
	Excitation of wheel blades by axial electromagnet at different regimes Voronova, Evgeniya ; Maturkanič, Dušan The paper describes the natural frequency identification experiment and results of measuring of blade vibration characteristics excitate by one axial electromagnet at different regimes. The measurements were performed in the laboratory of the rotational laser vibrometry originated at the Institute of Thermomechanics AS CR, v.v.i. Detailed record
	Analysis of the principle of exciting the turbine wheel of the magnet in various modes Voronova, Evgeniya ; Maturkanič, Dušan ; Procházka, Pavel ; Hodboď, Robert The report analyzes the principle of excitation of turbine wheel vibration by means of magnets switched on in harmonics, pulse, pulse-synchronous on IRC (encoder) and pulse-synchronous on IRC (encoder) and strain gauge. Furthermore, the effect of the pulse width and axial magnet excitation frequency on the turbine wheel model blade vibrations was verified.\n Detailed record
	Influence of excitation frequency and pulse width on blade vibration Voronova, Evgeniya ; Maturkanič, Dušan The paper describes results of measuring of blade vibration characteristics excitation by one electromagnet at harmonic regime.The measurements were performed in the laboratory of rotational laser vibrometry originated at the Institute of Thermomechanics AS CR, v.v.i.\n Detailed record
	Analysis of the turbine wheel model vibration Voronova, Evgeniya ; Maturkanič, Dušan ; Procházka, Pavel ; Hodboď, Robert ; Košina, Jan The paper describes the verification tests which were performed for 2000 rpm. Determined effects of vacuum on wheel vibration at 100 rpm and at \n500 rpm. Compare measurements at different speeds, with free oscillation or forced oscillation.\n Detailed record

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