Investigation of vibration and fatigue life of mistuned bladed disks

Repetckii, Oleg; Nguyen, Tien Quyet; Ryzhikov, Igor

doi:10.2991/aime-17.2017.114

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…моделировать сложные задачи[8][9][10]. Различные исследователи проделали большую работу по разработке анализа колеса турбины с использованием анализа МКЭ.…”

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Numerical Study of the Strength Radial Turbomachines Based on the Use of Stainless Steel 316L

Repetckii,

Cuong

2024

System Analysis &Amp; Mathematical Modeling

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By studying various properties of materials came to the conclusion that stainless steel 316L has good properties. This material is suitable for making radial wheel turbines compared to other materials. The object of the study is a radial wheel with 10 blades manufactured by “Schiele” (Germany), which specializes in the production of units for the chemical industry and ventilation equipment. The finite element method was chosen as the basic research method for solving problems of natural and forced vibrations, static stress and studying the degree of reactivity blades radial wheels of turbomachines. It can be argued that the numerical analysis of the strength characteristics of heavily loaded turbine elements with the help of electronic computers provides a greater depth of research, the breadth of the issues covered, significantly reduces the amount of expensive experimental research, reduces the time for designing new turbines in terms of efficiency, reliability, technology and resource saving of highly loaded units. In this paper, calculations were made of the characteristics of natural frequencies, equivalent stresses, deformation and the degree of reactivity blades when using material stainless steel 316L. It is noted that this material provides the criterion of stress concentration in the wheel as low as possible and the natural frequencies of the wheel are reduced, but it does not lead to a change in the oscillation modes of this wheel. So 316L stainless steel is recommended for evaluating options in the manufacture of this radial wheel of turbomachines in the field of power, chemical and transport engineering.

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Numerical Study of the Strength Radial Turbomachines Based on the Use of Stainless Steel 316L

Repetckii,

Cuong

2024

System Analysis &Amp; Mathematical Modeling

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Numerical analysis of dynamics and durability of rotor elements in gas turbine engines

Ryzhikov

Repetckii

Nguyen

2022

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In this work, an accurate algorithm for calculating the durability of rotor wheels in gas turbine engines undergoing detuning of parameters was developed. The finite element method, underlying the Ansys Software, was used for modelling free and forced oscillations of rotor wheels. During the experiments, the detuning was simulated by attaching additional masses to the wheel blades. The calculations of frequencies, modes of forced oscillations, as well as dynamic stresses arising due to these oscillations, were carried out using the Fourier series. The schematisation of dynamic stresses, i.e. differentiation of obtained stresses into levels having specific amplitudes, was used to calculate durability. The main research result comprises the developed algorithm for calculating the durability of rotor wheels of gas-turbine engines subjected to parameter detuning. This algorithm served as a basis for the Ocs_Rotor software for investigating the natural oscillations of blades and rotor wheels under parameter detuning. Using this software, the natural frequencies and oscillation modes of the blades were calculated. Dynamic stresses under forced oscillations, as well as durability of the rotor wheel, were calculated using the obtained results. The results of calculating the service life of an actual rotor wheel having three different positions of blades under detuning allowed the construction having the maximum service life of 1.75 * 105 hours to be selected. Comparing the results of calculations, obtained using the Ocs_Rotor software, with those of field experiments, carried out at Brandenburg Technical University (Cottbus, Germany), demonstrated high accuracy characterised by a maximum error of 4 %. This suggests that the software may be used to design structures of maximum service life. The results of durability calculations of an actual rotor wheel having different blade positions under detuning allowed practical recommendations for engineers on the positioning of the blades in the wheel to be established.

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Investigation of vibration and fatigue life of mistuned bladed disks

Cited by 2 publications

References 8 publications

Numerical Study of the Strength Radial Turbomachines Based on the Use of Stainless Steel 316L

Numerical Study of the Strength Radial Turbomachines Based on the Use of Stainless Steel 316L

Numerical analysis of dynamics and durability of rotor elements in gas turbine engines

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