scholarly journals Hardware organization of high-performance parallel calculations when analyzing mathematical models of aircraft flow

2005 ◽  
Vol 26 (4) ◽  
Author(s):  
І.А. Жуков ◽  
В.О. Гуменюк
Author(s):  
Vadim Kondrashev ◽  
Sergey Denisov

The paper discusses methods and algorithms for the provision of high-performance computing resources in multicomputer systems in a shared mode for fundamental and applied research in the field of materials science. Approaches are proposed for the application of applied integrated software environments (frameworks) designed to solve material science problems using virtualization and parallel computing technologies.


Author(s):  
Vladimir V. Kirsanov ◽  
Andrey Y. Izmaylov ◽  
Yakov P. Lobachevsky ◽  
Oksana A. Tareeva ◽  
Sergey N. Strebulyaev ◽  
...  

The study addresses the influence of milking duration of individual cows on the performance of conveyor-like rotary milking parlors and seeks to optimize their operation parameters and operating modes. The observational experiment was conducted in the Zhdanovsky Farm in Nizhny Novgorod Region, Russia. The dairy farm had a herd of 600 cows, divided into 10 groups by physiological characters and milk yield, and operated a 36 point milking parlor. Distribution of milking time of individual cows was studied using statistical analysis methods. The cyclogram of parlor operation and the functional connection of main parameters were analyzed using Maple analytical computing system, including its standard libraries and functions. The trends in idle time, which occurs due to undermilking of animals in one turn of the parlor, were studied. The idle time can result in overestimation of the number of stalls or decrease in the nameplate performance of the milking parlor by 30–40% from 120 to 93 cows per hour. Mathematical models, taking into account the influence of the milking time of individual animals (2 to 17 minutes) on the parameters of parlor operation, were developed. The algorithms of adaptive control over the rotational speed were proposed to minimize idle time in parlor operation and maintain the nameplate performance. The mathematical models, control algorithms and developed software can serves as a scientific basis for new designs of high-performance rotary milking parlors.


2010 ◽  
Vol 670 ◽  
pp. 369-378 ◽  
Author(s):  
Minoru Sasaki ◽  
Yusuke Onouchi ◽  
Hirohisa Tamagawa ◽  
Satoshi Ito

Mathematical models predicting the behaviour of IMPCs (Ionic Polymer-Metal Composites ) were built and their validity was verified computationally as well as experimentally. A transfer function associating the applied input voltage with the IPMC tip displacement was derived based on results obtained by vibration analysis. Employing the derived transfer function, three mathematical models, based on feed forward, feedback and two-degree-of-freedom models, were formulated. Computational and experimental verification of these models revealed that the feedback and two-degree-of-freedom models were capable of high performance in controlling the bending of an IPMC.


2021 ◽  
Vol 33 (5) ◽  
pp. 237-248
Author(s):  
Ivan Alekseevich Amelyushkin ◽  
Maksim Aleksandrovich Kudrov ◽  
Alexey Olegovich Morozov ◽  
Andrey Sergeevich Shcheglov

The study of aircraft icing modes, in which it is necessary to take into account the effect of droplet crushing, is of great interest in calculating the icing of aircraft, optimizing the hydrophobic and anti-icing properties of coatings, and is relevant in a number of other practical applications. Of great practical importance is the development of high-performance methods for calculating the interaction of aerosol flows with a solid. This work is devoted to the development of a model of particle dynamics, as well as a model of fragmentation of supercooled droplets of an aerosol flow during its interaction with the surface of a streamlined body. Developed physical and mathematical models can be used in software systems for numerical modeling of aircraft icing.


Author(s):  
Rakesh Kumar

Computational science (scientific computing or scientific computation) is concerned with constructing mathematical models as well as quantitative analysis techniques and using computers to analyze as well as solve scientific problems. In practical use, it is basically the application of computer simulation as well as other forms of computation from numerical analysis and theoretical computer science to problems in different scientific disciplines. The scientific computing approach is to gain understanding, basically through the analysis of mathematical models implemented on computers. Python is frequently used for highperformance scientific applications and widely used in academia as well as scientific projects because it is easy to write and performs well. Due to its high performance nature, scientific computing in Python often utilizes external libraries like NumPy, SciPy and Matplotlib etc.


2011 ◽  
Vol 16 (4) ◽  
pp. 177-181
Author(s):  
M.O. Alieksieiev ◽  
L.S. Hloba ◽  
K.O. Yermakova ◽  
V.V. Kushnir

The usage of high-performance computing technologies in the areas of scientific and engineering researches is considered. The method of the effective data processing paralleling is described. The using of high-performance computing based on the OpenMP library for solving problems in the field of Telecommunication, e.g. computation of the queues QoS parameters, is also analyzed


The article deals with high-performance information technology (HPC) for the problems of stress-strain analysis at all stages of the life cycle of buildings and structures: construction, operation and reconstruction. The results of numerical simulation of high buildings using software as a processor component based on a new hybrid algorithm for solving systems of linear algebraic equations [1] with a symmetric positive-definite matrix that combines computation on multi-core processors and graphs. It has been found that to accelerate the calculations, hybrid systems that combine multi-core CPUs with accelerator coprocessors, including GPUs, are promising [5]. To test the effectiveness of the proposed parallel algorithm for solving systems of linear algebraic equations [1], numerical experiments were carried out at the most dangerous loads of a 27-story building. Results of numerical researches with use for preprocessor (input of initial data) and postprocessor (output of results of calculations) of processing of the LIRA-SAPR software complex are presented [2, 4, 6]. The results of numerical studies of the behavior of structures of high buildings have shown a multiple reduction in the time of solving systems of linear algebraic equations with symmetric matrices on multiprocessor (multi-core) computers with graphical accelerators using the proposed hybrid algorithms [1]. High-performance technologies based on parallel calculations give more effect than more complex processes: modeling of life cycle of high buildings, bridges, especially complex structures of NPPs, etc. for static and dynamic loads, including emergencies in normal and difficult geological conditions, which make up 70% of Ukraine's territories.


2011 ◽  
Vol 332-334 ◽  
pp. 1955-1958
Author(s):  
Hua Wu Liu ◽  
Fan Jie Chu ◽  
Zong Bin Yang ◽  
Hong Ming Dai

Abstract: Igneous gem is a modified mineral glass without devitrification during processing, which is far stronger than traditional basalt materials comprising both glass and crystal phases. Fiber made by igneous gem is an ideal reinforcement for the armor of submarine, with advantages such as infrared stealth (thermal insulation), sonar stealth (anti-vibration), radar stealth (transparent to radar wave), heavy duty anticorrosion, bullet-proof (theoretical tensile strength 15,000MPa), fire resistant (working temperature 910 oC) and ultralow temperature resistant (working temperature up to -269 oC), anti-aging and so on. The corresponding experimental data and mathematical models were demonstrated in this study and compared with other high performance materials. The honeycomb structure was proposed for the prefabricated composite and the advantages of such a material were thoroughly stated.


2019 ◽  
Vol 8 (3) ◽  
pp. 7360-7365

The article is devoted to the optimization of annular diffusers of radial-axial turbines of small-sized gas turbine engines. It shows the results of verification of the used mathematical models for calculating the flow using experimental performance charts for annular diffusers. The results of the geometry optimization of the developed diffuser are presented. The final part of the article covers the results of the optimization of the diffuser geometry by the swirl angle of the inlet flow. As a result, a highly efficient diffuser was designed for a 50 kW microturbine under development.


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