Нестационарная расчетная модель пористого упорного подшипника и решение задачи об устойчивости его работы
The calculated model of a thrust bearing with a guide surface of the porous layer is given on the basis of linear non-stationary equations of Navier-Stokes and Darcy equation. The field of speeds and the field of pressures in lubricant and porous layers are found. Subsequently analytical dependencies for the basic operating characteristics of the bearing were received. As a result the problem of stability was solved on the basis of the equation of guide movement.
The purpose of the present activity is the research of influencing of an anisotropy of a permeability of an porous layer of a sliding bearing on a stable conditions of its activity at two directions of submission of lubrication - axial and radial.
Non-stationary model of a two-layer porous bearing of finite length with combined supply of lubricant is considered.
On the basis of full stationary Navier-Stokes and Darcy equations an asymptotic solution of the hydrodynamic calculation of the porous bearing of finite length is presented. On the basis of numerical analysis obtained in the analytical expression for the bearing capacity is established that when the permeability of the porous layer varies according to the same laws that form the lubricating film, the bearing in the bearing capacity possesses the dual action property. The effect of Reynolds number on the main bearing performance is assessed.
This volume presents new results in the study and optimization of information transmission models in telecommunication networks using different approaches, mainly based on theiries of queueing systems and queueing networks .
The paper provides a number of proposed draft operational guidelines for technology measurement and includes a number of tentative technology definitions to be used for statistical purposes, principles for identification and classification of potentially growing technology areas, suggestions on the survey strategies and indicators. These are the key components of an internationally harmonized framework for collecting and interpreting technology data that would need to be further developed through a broader consultation process. A summary of definitions of technology already available in OECD manuals and the stocktaking results are provided in the Annex section.