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Národní úložiště šedé literatury Nalezeno 17 záznamů.  1 - 10další  přejít na záznam: Hledání trvalo 0.00 vteřin. 
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.
Úplný záznam
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.
Úplný záznam
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.
Úplný záznam
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.
Úplný záznam
Identification of the blade tip possition and measurement techniques using the BTT method
 Maturkanič, Dušan ; Procházka, Pavel ; Hodboď, Robert ; Mekhalfia, Mohammed Lamine
This paper describes the existing practice in identifying and defining the position of the blade tips and the relevant technique for measuring their vibration during rotation. In connection with the effort to precisely define the position of the vibrating blade, the paper also analysed the possibilities of unambiguous determination of its position. This work creates a parallel branch to signal processing in the complex system of precision measurement and analysis of blade vibration, which was mentioned in previous papers.
Úplný záznam
Vibration mode shape extraction of bladed disk
 Mekhalfia, Mohammed Lamine ; Procházka, Pavel ; Tchawou Tchuisseu, Eder Batista ; Maturkanič, Dušan ; Hodboď, Robert
This research paper deals with the experimental protocol followed to visualize the vibration mode shape of an aero-engine bladed disk. This study is based on a comparison between the numerical results obtained through Finite element methods (FEM) using ANSYS software and experimentally using the laser Doppler vibrometer. Therefore the bladed disk was transformed into a 3D virtual environment and structural analysis was performed. The results demonstrate a match between the numerical and the experimental one, this match offers the possibility for using the model for future studies.
Úplný záznam
Two-way fluid structure interaction study of aero-engine compressor blade vibration under air excitation
 Mekhalfia, Mohammed Lamine ; Procházka, Pavel ; Tchawou Tchuisseu, Eder Batista ; Maturkanič, Dušan ; Hodboď, Robert
In this paper, we provide a numerical method via FEM software (ANSYS) using two-way Fluid-Structure Interaction (FSI) solver to estimate the blade’s vibration where the force used to excitation is a continuous air jet. This will help to provide data to diagnostic blade condition and health monitoring and a bridge toward a precise study of the blade’s dynamic under rotation and the estimation of blade’s displacement to define the amplitude and the frequency that occurs under different types of excitation which is a pillar for the process of machine condition and health monitoring.
Úplný záznam
Numerical estimation of blade displacement due to air excitation
 Mekhalfia, Mohammed Lamine ; Procházka, Pavel ; Tchawou Tchuisseu, Eder Batista ; Hodboď, Robert ; Maturkanič, Dušan
For the last few years, vibration measurement has taken an intense interest from research activities. For this reason, this article considers, besides vibration measurements, the impact of air forced excitation on blade motion, displacement and vibration through both simulation analysis and The Transformation of mathematical analysis that explain the interaction between fluid (Air) and the structure (Blade) into numerical setup along with FEM analysis through ANSYS Software. 3D Blade was created to meet the same characteristics of the real blade to enable real environment criteria for the simulation.
Úplný záznam
Dynamics of a magnetically excited blade: theoretical and experimental analysis
 Tchawou Tchuisseu, Eder Batista ; Procházka, Pavel ; Mekhalfia, Mohammed Lamine ; Hodboď, Robert ; Maturkanič, Dušan
This work dealt with the theoretical and experimental analysis of a static blade subjected to a magnetic excitation. The theoretical analysis combines the modeling and design of the blade via ANSYS in whih the modal analysis is done. Both methods showed qualitative agreement of the results.
Úplný záznam
Applicability of the deterministic methods in blade tip-timing analyses
 Maturkanič, Dušan ; Procházka, Pavel ; Hodboď, Robert ; Tchawou Tchuisseu, Eder Batista
The paper describes the possible use of the deterministic methods for analyses of blade vibration. In this respect, the main attention is focused on turbine rotor speed instabilities which could cause inaccuracy of results. The initial method and approach were presented in previous works. The measurements were performed in the Laboratory of the rotational laser vibrometry in the Institute of Thermomechanics, Academy of Sciences of the Czech Republic.
Úplný záznam

Národní úložiště šedé literatury : Nalezeno 17 záznamů.   1 - 10další  přejít na záznam:
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