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  • Unbekannt  (249)
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  • 1
    Online-Ressource
    Online-Ressource
    Computationally effective estimation of supersonic flow field around airfoils using sparse convolutional neural network
    IOP Publishing ; 2023
    In:  Fluid Dynamics Research Vol. 55, No. 3 ( 2023-06-01), p. 035504-
    Details
    In: Fluid Dynamics Research, IOP Publishing, Vol. 55, No. 3 ( 2023-06-01), p. 035504-
    Kurzfassung: This work proposes an innovative approach for supersonic flow field modeling around airfoils based on sparse convolutional neural networks (SCNNs) and Bézier generative adversarial network (GAN), where (1) the SCNN model is built to end-to-end predict supersonic compressible physical flow fields around airfoils from spatially-sparse geometries and (2) the trained Bézier-GAN is utilized to generate plenty of smooth airfoils as well as the latent codes representing airfoils. The spatially-sparse positions of airfoil geometry are represented using signed distance function (SDF). Particularly, the latent codes are merged with the SDF matrix and the Mach number to form the input of the SCNN model, effectively making the SCNN model possess more robust geometric adaptability to different flow conditions. The most significant contribution compared to the regular convolutional neural network is that SCNN introduces sparse convolutional operations to process spatially-sparse input matrix, specifically, which only focuses on the local area with flow information when performing convolution, eventually saving memory usage and improving the network’s attention on the flow area. Further, the testing results show that the SCNN model can more accurately predict supersonic flow fields with a mean absolute error lower than 5% and save 40% of graphics processing unit memory. These results indicate that the proposed SCNN model can capture the shock wave features of supersonic flow fields and improve learning efficiency and computing efficiency.
    Materialart: Online-Ressource
    ISSN: 0169-5983 , 1873-7005
    URL: Article
    DOI: 10.1088/1873-7005/acd7a0
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2023
    ZDB Id: 2003039-3
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Modeling and Analysis of the Ground Experiment for Restricted Three-Body Problem
    Trans Tech Publications, Ltd. ; 2014
    In:  Advanced Materials Research Vol. 926-930 ( 2014-5), p. 3084-3087
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 926-930 ( 2014-5), p. 3084-3087
    Kurzfassung: This paper analyzes the restricted three-body problems in the ground test systems. First, under the ideal condition, after analyzing the forces on the spacecraft in the rotating coordinates, a mathematical model of elliptic restricted three-body motion is founded. Second, for the restricted three-body problem in the ground test system, the forces on the test ball are analyzed and the corresponding elliptic mathematical model apart from the perturbation is founded. Then, based on the two models founded above, the similarity between the ideal spatial model and the ground simulation model is analyzed.
    Materialart: Online-Ressource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.926-930
    DOI: 10.4028/www.scientific.net/AMR.926-930.3084
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2014
    ZDB Id: 2265002-7
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    Design of a Semi-physical Simulation and Testing system for Space Robot Operating platform
    IOP Publishing ; 2021
    In:  Journal of Physics: Conference Series Vol. 1920, No. 1 ( 2021-05-01), p. 012111-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 1920, No. 1 ( 2021-05-01), p. 012111-
    Kurzfassung: In view of the importance and complexity of the control and execution tasks of the space robot, the development of a real test environment has the risks of high cost and long cycle. Therefore, a semi-physical simulation and testing system is designed for the space robot operating platform. The system is composed of a robotic arm console, a central control system, a fusion system, a position tracking system, etc., to realize the verification of the hardware electrical interface, software algorithm logic and task operation process of the robotic operating platform. Through the realization of 3D animation demonstration of the robot operation, motion tracking and other simulations, the semi-physical simulation and testing system has a higher visualization and a stronger sense of experience, and can simulate the complex operating conditions of the system on orbit. At present, the simulation and testing system has been successfully applied to the ground test of the space robot operating platform, and its reliability and simulation verification effect are better.
    Materialart: Online-Ressource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/1920/1/012111
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2021
    ZDB Id: 2166409-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 4
    Online-Ressource
    Online-Ressource
    3-Dimensional Localization Algorithm Research Based on Weighted Fusion with Projected Coordinate
    Trans Tech Publications, Ltd. ; 2015
    In:  Applied Mechanics and Materials Vol. 713-715 ( 2015-1), p. 1394-1400
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 713-715 ( 2015-1), p. 1394-1400
    Kurzfassung: Due to the serious problem of wireless 3-Dimensional localization technology affected by geographical conditions and other signal jamming, we proposed a new weighted 3-Dimensional localization algorithm based on TDOA-AOA. In this new algorithm, we obtained two groups of 3-Dimensional projected coordinate values of every test point using joint algorithm of TDOA and AOA. Then after weighted scaling, we got the localization coordinate of the point. It is proved by multiple sets of simulation experiments that this algorithm with data weighting can effectively reduce the localization error caused by the environmental interference, and thus ensure the accuracy and effectiveness of the results.
    Materialart: Online-Ressource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.713-715
    DOI: 10.4028/www.scientific.net/AMM.713-715.1394
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2015
    ZDB Id: 2251882-4
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 5
    Online-Ressource
    Online-Ressource
    Analysis of the Modeling of Single-Phase Flow in a Perforated Pipe with Wall Fluid Influx
    Trans Tech Publications, Ltd. ; 2013
    In:  Applied Mechanics and Materials Vol. 275-277 ( 2013-1), p. 491-495
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 275-277 ( 2013-1), p. 491-495
    Kurzfassung: Over the past two decades, the modeling of flow in a perforated pipe with influx through orifices on the pipe wall has been recognized as an important issue especially in the field of horizontal wells. This article provides a careful analysis of the current models that are all based on laboratory experiments. Results show that the models can be mainly divided into two categories according to the number of openings perforated along the conduit surface . One is developed based on experiments with one single perforation, which includes Asheim model, Yalniz model and Zhou model. This kind of models could not be readily used to calculate the pressure losses of the actual flows such as horizontal wellbore flow without modification and thus has a poor applicability. Another is based on experiments with multiple perforations, which includes Siwon model, Yuan model, Ouyang model, Su model and Wang model. Although these models are appropriate for the pressure losses prediction along the completion, all of them are semi-empirical, which implies the huge complexities of developing accurate ones. In addition, Siwon model and Yuan model are relatively the most comprehensive models which could be used to account for the various factors affecting the flow behaviors in perforated pipes. The equivalent friction factor due to pipe wall perforations of Su model has a more theoretical foundation with more room for improvement. This analysis about the models regarding the pressure drops in perforated pipes indicates that more efforts should be made to acquire a better understanding of the complex flow mechanism and build a unified model which is more theoretical and robust.
    Materialart: Online-Ressource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.275-277
    DOI: 10.4028/www.scientific.net/AMM.275-277.491
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2013
    ZDB Id: 2251882-4
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 6
    Online-Ressource
    Online-Ressource
    Calculation of Flexural Capacity of High-Strength Reinforced Concrete Beams Strengthened with FRP
    Trans Tech Publications, Ltd. ; 2011
    In:  Applied Mechanics and Materials Vol. 71-78 ( 2011-7), p. 815-817
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 71-78 ( 2011-7), p. 815-817
    Kurzfassung: The mechanical properties of high-strength reinforced concrete beams strengthened with FRP ( fiber reinforce polymer) are further investigated theoretically including it s failure mechanism and loadability,based on earlier theoretical works on RC beams. And the correlation equation of flexural capacity on the cross section of high-strength reinforced concrete beams strengthened with FRP is deduced according to different types of failure.The correlation equation is shown to be in good agreement with the experimental results, which can be referred to engineering application.
    Materialart: Online-Ressource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.71-78
    DOI: 10.4028/www.scientific.net/AMM.71-78.815
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2011
    ZDB Id: 2251882-4
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 7
    Online-Ressource
    Online-Ressource
    Modeling and Numerical Simulation Analysis of Chemical Plume in Flow Field
    Trans Tech Publications, Ltd. ; 2014
    In:  Advanced Materials Research Vol. 971-973 ( 2014-6), p. 93-97
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 971-973 ( 2014-6), p. 93-97
    Kurzfassung: A new discrete chemical plume model based on CFD was established, which avoids the shortcomings of the current model. In this model CFD was applied to simulate the turbulent environment of chemical plume, while the chemical substances contained in the plume were modeled as discrete phase. Utilizing this model, chemical plume under water was simulated numerically and analyzed hereafter. The transport characteristics of simulated plume were consistent with existing experimental results. Based on the simulation results, the effect of flow field on plume transport was also analyzed. The model proves an efficient approach to simulate the transport process in different environment, as well as analyze various types of actual situations. Moreover, this model can provide the theoretical basis for plume tracking algorithm research and simulation platform, which promotes significantly the research on chemical plume tracking.
    Materialart: Online-Ressource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.971-973
    DOI: 10.4028/www.scientific.net/AMR.971-973.93
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2014
    ZDB Id: 2265002-7
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 8
    Online-Ressource
    Online-Ressource
    Purification of Low Grade Ca-Bentonite for Iron Ore Pellets
    Trans Tech Publications, Ltd. ; 2012
    In:  Advanced Materials Research Vol. 454 ( 2012-1), p. 237-241
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 454 ( 2012-1), p. 237-241
    Materialart: Online-Ressource
    ISSN: 1662-8985
    DOI: 10.4028/scientific5/AMR.454
    DOI: 10.4028/scientific5/AMR.454.237
    Sprache: Unbekannt
    Verlag: Trans Tech Publications, Ltd.
    Publikationsdatum: 2012
    ZDB Id: 2265002-7
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 9
    Online-Ressource
    Online-Ressource
    Combined Detection of mRNA Expression of Alpha-Fetoprotein in Peripheral Blood and Telomerase Activity of Monocytes in Hepatocellular Carcinoma Patients
    Update Medical Publishing ; 2012
    In:  Hepatogastroenterology ( 2012-07-06)
    Details
    In: Hepatogastroenterology, Update Medical Publishing, ( 2012-07-06)
    Materialart: Online-Ressource
    ISSN: 0172-6390
    URL: Journal
    URL: Article
    DOI: 10.5754/hge12458
    DOI: 10.5754/hge12359
    RVK:
    XA 46722
    Sprache: Unbekannt
    Verlag: Update Medical Publishing
    Publikationsdatum: 2012
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
  • 10
    Online-Ressource
    Online-Ressource
    Study on the influences of different process temperatures on microstructural evolution of Mg-11%Al-2%Zn-1%Si alloy through isothermal semi-solid treatment
    IOP Publishing ; 2023
    In:  Journal of Physics: Conference Series Vol. 2539, No. 1 ( 2023-07-01), p. 012104-
    Details
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 2539, No. 1 ( 2023-07-01), p. 012104-
    Kurzfassung: Due to the eutectic reaction, the Mg 2 Si phase is inclined to creating an unfavorable fishbone shape at low solidification rates. This can significantly degrade the mechanical characteristics and become the main barrier to the practical application of Mg-Si based alloy. It is regarded that isothermal semi-solid treatment is an efficient technique to modulate the fishbone-shape eutectic Mg 2 Si phases in Mg-Si based alloys. In this work, a new type of Mg-11%Al-2%Zn-1%Si alloy is successfully fabricated through isothermal semi-solid treatment, and the influences of different process temperatures on microstructural evolution of Mg-11%Al-2%Zn-1%Si alloy are studied. The findings illustrate that the mean size of the α-Mg grains increases and their trendency of spheroidization becomes more evidently after held for 30 min at different process temperatures from 550 °C to 580 °C. Additionally, through isothermal semi-solid treatment, the eutectic Mg 2 Si phases in experimental alloy are totally changed from their original fishbone shape into polygon or granule shapes. With increasing the process temperatures, the mean size and morphologies of eutectic Mg 2 Si phases have no significantly changes. The morphological change theory of eutectic Mg 2 Si phases through isothermal semi-solid treatment is also studied.
    Materialart: Online-Ressource
    ISSN: 1742-6588 , 1742-6596
    URL: Article
    DOI: 10.1088/1742-6596/2539/1/012104
    Sprache: Unbekannt
    Verlag: IOP Publishing
    Publikationsdatum: 2023
    ZDB Id: 2166409-2
    Standort Signatur Einschränkungen Verfügbarkeit
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    Online-Ressource
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