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Information × Registration Number 0223U001361, 0122U001336 , R & D reports Title Development of the theory and methods of analysis of vibration processes in complex deformable systems under operational loads of periodic, stochastic and shock character popup.stage_title Head Lizunov Petro P., Доктор технічних наук Registration Date 28-01-2023 Organization Kyiv National University of Construction and Architecture popup.description2  The theoretical foundations of the analysis of vibration processes in complex deformable structures under operational loads of periodic, stochastic and impact nature have been developed. An analysis of the world scientific research on the subject of the project was carried out. It was established that nonlinear energy sink absorbers of small mass with correctly selected parameters can be used to damp the vibrations of the main primary structure of a much larger mass. It is shown that the selection of parameters of nonlinear energy sinks in view of their effectiveness should be investigated separately in each specific case. An analysis of the current state of the problem of parametric oscillations of shells and the influence of shape imperfections on their dynamic characteristics has been carried out. A numerical approach to determining the most dangerous form of shell imperfection in parametric oscillation problems has been developed. At the same time, the most dangerous model of imperfection is considered to be the one that maximally affects the critical values of the parametric load and the region of stability of the main parametric resonances. The developed numerical approach will make it possible to determine and compare the reduced stiffness and geometric stiffness matrices of shells with different shapes and amplitudes of imperfections, to identify and investigate the most dangerous influence of shell shape imperfections on the stability of parametric oscillations, including stochastic. Product Description popup.authors Ivanchenko Grygorii M Vorona Yurii Volodymyrovych Krivenko Olga Petrivna Lukianchenko Olha Oleksiivna Pogorelova Olga Semenivna Postnikova Tetiana Georgiivna popup.nrat_date 2023-01-28 Close