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Dynamic stability of mechanically and thermally loaded three-layered annular plate with viscoelastic core

Pawlus Dorota

Vibrations in Physical Systems

2020

Vol. 31, nr 2

art. no. 2020223

The problem of dynamic stability of composite three-layered annular plate with viscoelastic core is the subject of the consideration. Plate composed of thin outer layers and soft core is loaded quickly in time with forces compressing facings and with temperature gradient in radial direction. Two kinds of plate support system are analysed: plate slideably clamped in thermo-mechanical problem and plate clamped on both edges in thermal analysis. The analytical and numerical solution, which is based on the orthogonalization and finite difference methods includes axisymmetric and asymmetric forms of buckling and rheological properties of plate core.

Physical model of simultaneous disparaging and dehydration of fine porous material in thermal vacuum installation

Kutovyi V. O., Lutsenko A. S., Skoromnaya S. F., Tkachenko V. I.

Journal of New Technologies in Environmental Science

2017

Vol. 1, nr 4

142--149

Carbon materials represent difficult chemical compounds [1, 2]. They demand not only dispergating (crushing), and dehydration (removal of moisture) [3], but also cleanings of harmful impurity which negatively influence the environment at their further use in the industry. Now there are many installations and techniques of dehydration and dispergating of rheological material, including coals of different types. Comparative analysis of standard technologies and technology of thermal vacuum dehydration and dispergating of brown coal carried out. The experimental technique of dehydration and dispergating of brown coal described. Temperature, pressure, time of dehydration and dispergating of brown coal are determined. The physical model of simultaneous dehydration and dispergating of fine porous material offered. Dispergating of the dried-up material described by means of two models of disintegration of a part in the course of drying: discrete and continuous. It shown that at the initial stage of drying the maximum difference on the mass of the extracted water calculated on two models makes size about 7%. On big times of drying dependence of amount of the extracted water on time for the models considered above is almost identical. Calculations show that rapid withdrawal of water from a sample explains rather intensive process of crushing of the dried-up material at the initial stage of drying. At the same time with excess of temperature of the heater by 1.68 times over temperature of boiling of water with the lowered part pressure in the same number of times are crushed quicker. Comparison of theoretical calculations with experimental data shows adequacy of the offered models of dehydration and dispergating of fine rheological material.