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Information × Registration Number 0309U000134, 0107U000452 , R & D reports Title Theory and methods of analysis of vibration fields evolution in elastic systems under stochastic loadings popup.stage_title Розробка методів теоретичного дослідження вібраційних полів в пружних комбінованих системах при дії стохастичних впливів різної природи Head Bazhenov Viktor, Registration Date 29-01-2009 Organization Kiev National University of bildiny and tecture popup.description2 Two approaches to the hypersingular boundary integral equation construction were proposed for description of dynamics elastic stress fields in 3-D bodies. It was found out that the use of the first one, based on the transfer of differentiation from the singular kernel to the unknown density, was restricted by low frequencies. The second approach, proved to be more universal, was based on the direct integration over circle and limiting transition to the boundary. The investigation of vibroimpact systems dynamic is fulfiled. The impact is taken into consideration by three different way: the impact simulatrion by elastic force, by Hertz force and by limit condition with recovery coefficient using. The comparison of these methods is executed. It is determined that the impact in such model is simulated better by contact force. The influence of impact system parameters at it dynamic is analysed. The dynamic stability of the corrugated T-beam parametric oscillation under periodic distributed loading was investigated. Numerical analysis of the stochastic stability of the above mentioned beam random parametric vibration was fulfilled by the Monte Carlo method. As it was found out the narrow-band process was similar to the harmonic one and stability boundaries of random parametric vibration coincided with those of main combination parametric resonance. Product Description popup.authors popup.nrat_date 2020-04-02 Close