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29th Saint Petersburg International Conference on Integrated Navigation Systems, ICINS 2022

作者： Barantsev, G.O. Kozlov, A.V. Shaimardanov, I.Kh. Nekrasov, A.V. Navigation and Control Lab. Lomonosov Moscow State University Moscow Russia Algorithms and Software Dev. Jsc "inertial Technologies of Technocomplex" Russia

ISBN: (纸本)9785919950844

We present a model of the dynamic elastic torsion of the mechanical dithering dev.ces of ring laser gyroscopes and analyze its impact on the accuracy of attitude determination in a strapdown inertial navigation system. We also describe a method for calibrating such parameters in order to compensate for this effect in attitude integration algorithm. The method is an extension to the existing calibration technique introduced in 2009 by N.A. Parusnikov of Moscow State University, applicable to tactical and navigation grade inertial systems on a turntable with horizontal rotation axis. New parameters of dynamic elastic torsion are included into the state vector of a linear state-space model subject to estimation. We examine their estimability and predicted covariance, and as present experimental results. We extend the model with three parameters, which was described in our previous work, to the one with nine parameters. © 2022 Elektropribor.

关键词： Calibration

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Elastic Dynamic Torsion of a Ring Laser Gyroscope Mechanical Dither and its Effect on the Accuracy of Attitude Determination 28

Elastic Dynamic Torsion of a Ring Laser Gyroscope Mechanical...

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28th Saint Petersburg International Conference on Integrated Navigation Systems, ICINS 2021

ISBN: (纸本)9785919950806

We analyze the effect of the dynamic elastic torsion, which mechanical dithering dev.ces of ring laser gyroscopes can be subject to, on the accuracy of attitude determination in a strapdown inertial navigation system. We also describe a method for calibrating their parameters in order to compensate for this effect in attitude integration algorithm. The method represents an extension of the existing technique introduced in 2009 by N.A. Parusnikov from the Moscow State University, applicable to tactical and navigation-grade inertial systems on a turntable with horizontal rotation axis. New parameters of dynamic elastic torsion get into the state vector of a linear state-space model subject to estimation. We examine their observability and predicted covariance, as well as present the experimental results. © 2021 Concern CSRI Elektropribor, jsc.

关键词： inertial navigation systems

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A Model of the Elastic Dynamic Torsion of a Ring Laser Gyroscope Mechanical Dither and a Method for its Calibration

A Model of the Elastic Dynamic Torsion of a Ring Laser Gyros...

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Saint Petersburg International Conference on Integrated Navigation Systems (ICINS)

作者： G.O. Barantsev A.V. Kozlov I.Kh. Shaimardanov A.V. Nekrasov Navigation and Control Lab. Lomonosov Moscow State University Moscow Russia Algorithms and Software Dev. JSC "Inertial Technologies of Technocomplex" Russia

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Elastic Dynamic Torsion of a Ring Laser Gyroscope Mechanical Dither and its Effect on the Accuracy of Attitude Determination

Elastic Dynamic Torsion of a Ring Laser Gyroscope Mechanical...

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Saint Petersburg International Conference on Integrated Navigation Systems (ICINS)

作者： G.O. Barantsev A.V. Kozlov I.Kh. Shaimardanov A.V. Nekrasov Navigation and Control Lab. Lomonosov Moscow State University Moscow Russia Algorithms and Software dev. JSC “Inertial Technologies of Technocomplex” Russia

关键词： inertial navigation Production Ring lasers Position measurement Laser modes Gyroscopes Calibration

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Steps Towards a Hypersonic Entry Test Platform

Steps Towards a Hypersonic Entry Test Platform

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AIAA SciTech Forum

作者： Johnson, Breanna J. Pedrotty, Samuel M. Bouslog, Stan A. Hagen, Richard A. O'Neill, William J. D'Souza, Sarah N. Larsen, Gregory S. Cramer, Corson L. More, Donald E. Steffes, Stephen R. Fritz, Matthew P. DeTrempel, Paul A. Rocca-Bejar, Daniela Hoffman, David A. NASA Johnson Space Ctr Flight Mech & Trajectory Design Branch Houston TX 77058 USA NASA Johnson Space Ctr Autonomous GN&C Branch Houston TX 77058 USA NASA Johnson Space Ctr Struct Engn Div Houston TX 77058 USA NASA Johnson Space Ctr Test & Operat Off Houston TX 77058 USA NASA Johnson Space Ctr Spacecraft Performance & Concept Engn Branch Houston TX 77058 USA NASA Ames Res Ctr Entry Syst & Vehicle Dev Branch Mountain View CA 94035 USA Oak Ridge Natl Lab Mfg Sci Div Energy Sci & Technol Div Oak Ridge TN 37830 USA Millennium Engn & Integrat Co Arlington VA 22202 USA Charles Stark Draper Lab Space Explorat GN&C Grp Houston TX 77058 USA CACI Int Inc Houston TX 77058 USA Jacobs Technol Inc Orbit GN&C & Flight Mech JE26 Houston TX 77058 USA

ISBN: (数字)9781624107115

ISBN: (纸本)9781624107115

Hypersonic flight introduces unique challenges to the mission and vehicle design process. Not only must a vehicle withstand the extreme temperatures and aerodynamic loads of atmospheric reentry, it must also deliver a payload to its targeted destination with precision. Compounding these challenges are limited opportunities for testing new technologies in these extreme environments due to the higher costs of reaching hypersonic speeds. This stymies progress in the state of the art for entry technologies. NASA is leveraging prior investments in cost-cutting technologies to create a low-cost, hypersonic fight test platform (HyperSTEP) for advancing entry technologies. Access to flight data from repeated testing will strengthen heritage tools and accelerate the maturation and infusion of new technologies into flagship missions. This paper will discuss the steps that have been taken toward HyperSTEP dev.lopment and the technologies that would be advanced by its test flights.

关键词： NASA Aerodynamic Force Hypersonic Speed Flight software Hypersonic Flight Flight Test Vehicle Thermal Protection System Hypersonic Inflatable Aerodynamic Decelerator Sounding Rockets Unitary Plan Wind Tunnel

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Density functional theory based computation of the optoelectronic properties of double perovskites A2InAgBr6 (A= Na, Cs, Rb, and K) and their performance assessment as absorber for photovoltaic applications

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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING 2025年 190卷

作者： Kumar, Gagan Ravidas, Babban Kumar Bhattarai, Sagar Roy, Mukesh Kumar Samajdar, Dip Prakash PDPM Indian Inst Informat Technol Design & Mfg Jab Dept Nat Sci Jabalpur 482005 India Indian Inst Technol Guwahati Technol Innovat & Dev Fdn Gauhati 781039 Assam India PDPM Indian Inst Informat Technol Design & Mfg Dept Elect & Commun Engn Jabalpur 482005 India

Double perovskite (DP) halides have shown promising performance in photovoltaic (PV) and thermoelectric technologies. In the current work, the WIEN2K software is utilized to implement first-principles calculations on the absorber material A2InAgBr6 (where A stands for Cs, Rb, K, and Na) to compute its structural and optoelectronic properties. Furthermore, SCAPS-1D is utilized to evaluate the PV parameters of the n-i-p configuration of perovskite (PVSK) solar cell (PSC) configuration (FTO/ETL/A2InAgBr6/HTL/Au) with PEDOT: PSS as HTL (hole transport layer) and TiO2 as the ETL (electron transport layer). PBE-GGA + TB-mBJ exchange-correlation potential method is utilized for the computations. The direct bandgaps (Eg) of Na2InAgBr6 (1.87 eV), K2InAgBr6 (1.81 eV), Rb2InAgBr6 (1.75 eV), and Cs2InAgBr6 (1.76 eV) is obtained by TB-mBJ potential. The optical characteristics of A2InAgBr6 are computed to understand its potential for PV applications, correlating them with the electronic characteristics. DFT-calculated properties of A2InAgBr6 DP are utilized as inputs in SCAPS-1D for simulation. The thickness of PVSK (t) and defect density (Nt) are usually considered while optimizing PSC performance using SCAPS-1D. A notable maximum power conversion efficiency (PCE) of 19.80 % with a shortcircuit current density (jsc) of 20.13 mA/cm2, an open-circuit voltage (Voc) of 1.22 V, and a fill factor (FF) of 79.78 %, is achieved with the structure FTO/TiO2/Cs2InAgBr6/PEDOT: PSS/Au. This study is focused on the performance assessment of some relatively new DP halide structures using a combination of DFT as well as the SCAPS-1D calculation to find alternatives to the efficient lead-free PVSK absorber materials.

关键词： Density functional theory (DFT) Band-structure Optoelectronic properties Density of states (DoS) Double PVSKs

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Hydrocarbon systems and assessment of the probability of discovery of oil and gas accumulations in the bering sea 23

Hydrocarbon systems and assessment of the probability of dis...

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23th Conference on Oil and Gas Geological Exploration and dev.lopment, Geomodel 2021

作者： Senin, B.V. Guryanov, S.A. Kerimov, V.Yu. Lavrenova, E.A. JSC Soyuzmorgeo Sergo Ordzhonikidze Russian State University for Geological Prospecting ASAP Service

ISBN: (纸本)9789462823839

To study the hydrocarbon systems, geochemical and lithological studies were carried out and modeling technologies were used using Schlumberger "PetroMod" software systems, small-scale modeling of sedimentary basins of this region and their hydrocarbon systems was carried out. As a result of research and modeling, a forecast of the distribution of potentially non-gas source strata of the Paleogene and Neogene was made. The prognosis of the OM maturity levels of the oil and gas source strata of the Anadyr oil and gas region, carried out in the process of modeling hydrocarbon systems, based on the results of studying the reservoir temperatures and the reflectivity of vitrinite in the wells of its mainland, showed that in the most curved sections (basins) of the sedimentary basin of the same name, all potential oil and gas source strata have reached sufficient maturity for the generation of hydrocarbons. At the same time, the degree of OM catagenesis in the Eocene-Oligocene oil and gas source strata generally does not exceed the stages of predominant generation of liquid hydrocarbons. At the same time, the potential oil and gas source strata of the Miocene reached the level of the oil window in relatively small areas of the oil and gas bearing region. In general, the most bowed sections (hollows) of the Anadyr sedimentary basin, in which mature oil and gas source deposits are located, can be considered as potential sources of hydrocarbon generation. © Geomodel 2021 - 23th Conf. on Oil and Gas Geo. Expl. and dev. All rights reserved.

关键词： Hydrocarbons

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Efficiency Enhancement of Tethered High Altitude Communication Platforms Based on Their Hardware-software Unification 1

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21st International Conference on Distributed and Computer and Communication Networks (DCCN)

作者： Perelomov, V. N. Myrova, L. O. Aminev, D. A. Kozyrev, D. V. Russian Acad Sci VA Trapeznikov Inst Control Sci 65 Profsoyuznaya St Moscow 117997 Russia JSC Moscow Order Red Banner Labor Sci Res Inst Ra Bolshoi Trehsvyatitelskii Lane 2-1 Moscow Russia RUDN Univ Peoples Friendship Univ Russia 6 Miklukho Maklaya St Moscow 117198 Russia

ISBN: (数字)9783319994475

ISBN: (纸本)9783319994475;9783319994468

The article presents the results of the analysis of the need for unification of tethered telecommunication high-altitude platforms (HAP). Possible ways of unification and standardization of HAP, as well as criteria and methods of their structural optimization are considered. It is shown that one of the methods for increasing the efficiency of telecommunication networks is the unification of requirements, component parts and their composite systems. The requirements that should be laid at the stage of setting a technical task for product dev.lopment are given and it is shown that such parameters as the repeatability factor, the applicability factor, the inter-project unification coefficient are used to assess the level of unification. It is shown that to solve the problems of hardware-software unification and ensure information compatibility, it is necessary to dev.lop appropriate models that take into account the specifics of modern information transmission systems in HAP. The rationale for using the apparatus of logical-dynamic models for solving unification problems is proved, and their joint use with network models allows to formalize the information necessary for solving the problems of hardware-software unification of HAP and ensuring their information compatibility.

关键词： Telecommunication systems Tethered high-altitude platforms Unmanned aerial vehicles Hardware-software unification Structural optimization Unification efficiency Graph apparatus

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