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Information × Registration Number 0222U002445, 0117U002231 , R & D reports Title Determination of the influence mechanisms on vibration characteristics of non-conservative mechanical systems of initial structural-and-technological defects and local operational damages considering various external factors. popup.stage_title Head Matveev Valentin , Доктор технічних наук Registration Date 13-02-2022 Organization GS Pisarenko Institute of Strength Problems of the National Academy of Sciences of Ukraine popup.description2 A set of computational and experimental studies to determine the effect of local operational damage such as cracks and dents of various shapes, sizes and locations on the formation of natural and resonant vibrations of rod structural elements and their systems, taking into account the characteristics of energy dissipation. The methods of determining the vibrodiagnostic indicators of the presence of breathing cracks of different shapes in the rod structural elements developed at the previous stages have been expanded. Using the discrete model of the regular system, the influence of the characteristics of damage, energy scattering and elastic coupling parameters of the subsystems on the spectrum of resonant frequencies and amplitudes of vibrations was studied. The influence of contact interaction parameters and amplitude of kinematic excitation of shrouded blades on their forced vibrations is determined. The method developed in the previous stages of determining the aerodynamic loads acting on the blades during their subsonic flow, resulting from the deformation of the blade profile and rocker arm of its elastic suspension and ballast movement, has been improved. Scientific bases of modelling and analysis of vibration damping of structural elements made of viscoelastic and electroviscoelastic layered materials have been developed. The existing method of vibration processing and estimated evaluation of the influence of high-frequency mechanical forging modes on the fatigue resistance of welded specimens and elements of metal structures has been improved.  Product Description popup.authors popup.nrat_date 2022-03-09 Close