The natural vibration of an elastic sandwich beam on an elastic foundation is studied. Bernoulli's hypotheses are used to describe the kinematics of the face layers. The core layer is assumed to be stiff and compressible. The foundation reaction is described by Winkler's model. The system of equilibrium equations is derived, and its exact solution for displacements is found. Numerical results are presented for a sandwich beam on an elastic foundation of low, medium, or high stiffness
The article presents the results of a study of electromagnetic effects from space rocket activity using the example of the Plesetsk cosmodrome and aviation complex using the example of Ostafyevo Airport. The influence of electromagnetic pollution on the environment is considered; the authors analyze the influence of electromagnetic fields on human health taking into account thermal effects. It was demonstrated that the long-term effect of electromagnetic sources with different wavelengths at moderate intensity causes changes in the irritability of visual, olfactory and vestibular analyzers, as well as development of functional disorders in the nervous system without pronounced changes in endocrine-metabolic processes and blood composition, also trophic disturbance might be present. The authors study in detail the main anthropogenic sources of electromagnetic effects from objects of rocket and space, and aviation activities.
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