simulation

Determination of Hydro-Erosion Wear Coefficient for Sealing Elements of Pipeline Fittings

A model of hydro-erosion wear of sealing elements was constructed taking into account a set of parameters that reflect the physical properties of the fluid and the material of the sealing elements, as well as the design parameters of the valves. To determine the dependence of the rate of erosion wear on a complex of parameters, we use the π-theorem of similarity and the method of dimension analysis. An expression is given that determines the change in the thickness of the erosive fracture of the sealing surfaces in time.

Simulation of transients for designing multiple power filter circuits

The practice of operating multiple single-tuned filters in industrial power supply systems has shown that technological transformer capacitors in switching filters within the systems can cause the damage of filters. The most disturbing loads on the power supply systems are powerful AC arc furnaces. Static Var compensators used in the power supply systems contain multiple harmonic filters for harmonic mitigation and reactive power compensation.

Методи і засоби проектування мікропотокових МЕМС типу LAB-ЧІП

In the article a hydrodynamic flow model for microfluidic MEMS is presented. Methods and tools for design automation of microfluidic flows were applied. The possibilities of modern CAX tools for the simulation and optimization of fluid flow in microchannels were analyzed.

Моделювання розпилювання колоди розвальним способом на пиломатеріали з урахуванням її реальної форми

Mathematical model of log sawing to parallel of linear regressive axis by through-andthrough method into lumber with consideration of surface shape of real logs based on results of scanning for surface shape of log cross sections was developed. The features of calculation for mathematical model of sawing pattern taking account log rotation or sawing pattern around log axis at the fixed angle under cutting (sawing) by vertical and horizontal cutting planes were validated.

Analysis and implementation of computing workflows for service-oriented CAE/CAD software

This paper is devoted to the architectural aspects of integration of workflow management into service-oriented CAE/CAD software capable to run computations on grid resources. The analysis of possible solutions is based on the workflow execution time estimation. The multilevel workflow concept is also described.

Analiz rezultativ imitatsiinoho modeliuvannia shchodo vplyvu temperaturnykh chynnykiv na stan poverkhon v protsesi yikh formoutvorennia [Analysis of simulation results the effect of temperature factors on the condition of the surfaces in forming process]

Simulated thermal rheological pattern cutting, the influence of dynamic deformation temperature indicators on the quality of surface finish, and the influence of thermodynamic parameters on the mode of deformation of the workpiece and the tool, and thus the formation of residual stresses and strains.

Forming of crude oil mixtures with increased yield of target fractions

Researches results of 5 samples of crude oil have been analyzed and generalized. The relationship between component, structural-group composition and physico-chemical properties have been determined to classify crude oil reliably and rapidly. Compounding and sequence of crude oil mixture forming have been developed to provide the maximum yield of target fractions. These principles are based on combination of simulation method, cluster and statistic analyses. The expediency of the proposed forming method has been confirmed experimentally.

Effect of water trees ′string of pearls′ configuration on the distribution of electric field, current and stressed volume in XLPE insulation

The processes originating in local areas of cross-linked polyethylene (XLPE) insulation of extra-high voltage cables during water tree germination between closely disposed water micro-inclusions in insulation have been studied. According to current experimental data, water trees in XLPE have not solid cylindrical shape, as it was thought previously, but they consist of closely spaced nanoscale inclusions of spheroid form and nanoscale thin water channels between them (so-called "string of pearls" confi­guration).

The analysis and modeling of queues forming and processing in the network devices

The investigation has covered buffer resource and queue management as main and the most important network traffic parameter and access control and overload mechanism. Network devices interaction model can performed by three levels:
-    physical layer;
-    protocols layer;
-    queues consolidating two previous levels.