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1

Excitation of an extreme wave by standing current

Anakhov Pavlo

Oceanologia

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2023

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Vol. 65 (4)

564--570

EN

The statistics suggest that extreme waves cause more damage in shallow waters and at the coast than in the deep sea. In the linear theory of the formation of extreme waves, their existence is interpreted as a local superposition of surface monochromatic waves. The event of excitation of extreme waves can be understood as an increase in natural oscillations of the water basin. The conditions for the excitation and sustaining of natural oscillations are the proximity of the periods of exciting traveling waves to the period of traveling waves and the speed of movement of the exciting current to the phase speed of propagation of traveling waves of the reservoir. Examples of stimulating natural oscillations are presented. We determined the range of expected periods of natural oscillations, which range from 30 seconds to 24 hours. Synchronously and in common-mode with the oscillations of standing waves between their antinodes, a "standing" current occurs with a measured speed of up to 11 km/h. We presented a hypothesis about the possibility of stimulating natural oscillations of water bodies by a standing current, which changes its direction due to the movement of the water surface from the trough of the wave to its crest, and back. A model of stimulating oscillations by the waves with a constant period and currents with constant and variable speeds has been developed.

2

Modern Methods of Irrigation Water Purification by a Mesh-Filter Using Influence of Low Frequency Vibration

Bilokon S., Turbal Y., Kunanets N., Pasichnyk V.

ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes

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2019

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Vol. 8, No 2

21--26

EN

The article is devoted to the analysis of different methods of irrigation water purification from suspended particles. There have been considered the problems of irrigation water purification by using the low-frequency vibration technology and the effects arising from the influence of vibration on the water with different floating impurities. Vibration parameters that allow obtaining the effect of standing wave was substantiated. Also in the article have been disclosed the influence of low-frequency vibration on the quality of water purification depending on the types of pollution and their granulometric composition. Obtained the hydraulic characteristics of the mesh such as the effect of vibration on the pressure loss.

3

Standing Waves and Acoustic Heating (or Cooling) in Resonators Filled with Chemically Reacting Gas

Perelomova A., Pelc-Garska W.

Archives of Acoustics

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2014

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Vol. 39, No. 3

403--410

EN

Standing waves and acoustic heating in a one-dimensional resonator filled with chemically reacting gas, is the subject of investigation. The chemical reaction of A → B type, which takes place in a gas, may be reversible or not. Governing equations for the sound and entropy mode which is generated in the field of sound are derived by use of a special mathematical method. Under some conditions, sound waves propagating in opposite directions do not interact. The character of nonlinear dynamics of the sound and relative acoustic heating or cooling depends on reversibility of a chemical reaction. Some examples of acoustic heating in a resonator are illustrated and discussed.

4

Compensative control chart of angular velocity sensor on basis of wave solid-state gyroscope

Gankevych Z., Kucher S., Bondar P.

Vibrations in Physical Systems

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2010

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Vol. 24

111--116

EN

This work is devoted to results of research wave solidstate gyroscope (WSG) with a metallic cylinder resonator and piezoelectric systems of excitation and pickup information, which works in the mode of compensation angular velocity sensor. This type of device becomes more and more attractive thanks to its low cost, considerable vibrostability, shockproof and enough high precision characteristics. In the work there are results of design the power balancing channel, which provides functioning of gyroscope in the compensative mode in the environment of MatLAB-Simulink. Numerical parameters, namely basic mode frequencies of vibration, which are used in model, were got by means of finite element analysis of real resonator model in the environment of ANSYS. It is shown that application of integral-position control law gives the desired dynamic characteristics both to the action of permanent angular speed and to the change of it by harmonic law.