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International Conference on Applied Mathematics, Computational Science and Mechanics 2018: Current Problems, AMCSM 2018

作者： Misyurin, S Yu Nelyubin, A.P. Potapov, M.A. National Research Nuclear University MEPhI Moscow Russia Mechanical Engineering Research Institute of the RAS Moscow Russia Institute of Computer Aided Design of the RAS Moscow Russia

The article discusses the formulation of the problem of multicriteria design of a robotic system consisting of a group of robots, with the aim of achieving specified targets. A new approach to organizing the control of such robotic systems based on the partial dominance of decisions over target indicators is proposed. Illustrative examples of the application of the approach for UAV groups are given. © Published under licence by IOP Publishing Ltd.

关键词： Machine design

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Multi-criteria optimization of tracked vehicle transmissions

Multi-criteria optimization of tracked vehicle transmissions

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6th International BAPT Conference on Power Transmissions, PT 2019

作者： Ustynenko, Oleksandr Bondarenko, Oleksiy Klochkov, Illia Serykov, Volodymyr National Technical University 'Kharkiv Polytechnic Institute' Department of Theory and Computer-Aided Design of Mechanisms and Machines Kharkiv61002 Ukraine

The article is devoted to the problem of computer modeling of rational design of tracked vehicle transmissions with multiple criteria. The problems of finding optimal geometric parameters that satisfy several quality criteria. All the complexity of the layout and the relationship of the parameters make difficult their choice, which is simplified when using approaches of mathematical optimization. Using the famous pseudo-random method LPτ-search with the author's modification made it possible to avoid problems associated with the discreteness and the number of parameters. The main optimization criteria for transmission are minimum center distance, minimum length, minimum mass, and maximum uptime probability. To solve this problem, the problem was formulated and design parameters with constraints were specified, criteria were recorded and a transformation from multicriteria to a single criterion was proposed. The approach is based on analysis of test points that obtained using LPτ-search, and further processing of the information received. The approach of transformation from many criteria to one is proposed by introducing the scale of importance by the designer and assigning the importance of each of the criteria, finding the desired solution for each trial point of relative offset, which is proposed to be used as a unifying criterion. Basic schemes and flowcharts of the algorithm elements are provided. The implementation of the computer model was carried out in the Delphi 7 environment. © 2019 The Authors, published by EDP Sciences.

关键词： Vehicle transmissions

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Applied Mathematics and Mechanics in Aerospace Industry 1

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13th International Conference on Applied Mathematics and Mechanics in the Aerospace Industry, AMMAI 2020

作者： Favorskaya, Margarita N. Jain, Lakhmi C. Nikitin, Ilia S. Reviznikov, Dmitry L. Reshetnev Siberian State University of Science and Technology Institute of Informatics and Telecommunications 31 Krasnoyarsky Rabochy ave. Krasnoyarsk660037 Russia University of Technology Sydney Ultimo Australia Liverpool Hope University Liverpool England United Kingdom KES International Shoreham-by-Sea United Kingdom Institute of Computer Aided Design of the RAS 19/18 Vtoraya Brestskaya ul. Moscow123056 Russia 4 Volokolamskoe shosse Moscow125993 Russia Federal Research Centre "Information and Control" of the RAS 44 Ul. Vavilova Moscow119333 Russia

ISBN: (数字)9789813348264

ISBN: (纸本)9789813348257

The chapter contains a brief description of chapters that contribute to the development and applications of computational methods and algorithms in different areas of gas, fluid, and plasma dynamics, solid mechanics, dynamic systems and optimal control, information technology. The first part presents the recent advances in computational fluid dynamics. The second part introduces numerical simulation of plasma and multiphase flows. The third part is devoted to computational solid mechanics, the fourth part provides a numerical study of dynamic systems and the fifth part focuses on information technology and artificial intelligence. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Numerical models

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System for solving multicriteria problems with fuzzy preferences

System for solving multicriteria problems with fuzzy prefere...

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International Conference on Applied Mathematics, Computational Science and Mechanics 2018: Current Problems, AMCSM 2018

作者： Nelyubin, A.P. Podinovski, V.V. Potapov, M.A. Mechanical Engineering Research Institute of the RAS Moscow Russia National Research University Higher School of Economics Moscow Russia Institute of Computer Aided Design of the RAS Moscow Russia

The new version of the software system DASS designed to solve multicriteria problems using methods of the criteria importance theory is described. A new approach has been developed by the authors, allowing to take into account inaccurate and fuzzy information about preferences of decision makers. © Published under licence by IOP Publishing Ltd.

关键词： Decision making

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The SI and EMI Analysis of Sub-Femto-Farad readout circuit for capacitive sensor

The SI and EMI Analysis of Sub-Femto-Farad readout circuit f...

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Workshop on Electromagnetic Compatibility of Integrated Circuits (EMC Compo)

作者： Xinquan Lai Yuheng Wang Mingming Liu Lingfei Zhang The Institute of Electronic Computer-Aided Design Xidian University

Due to the scaling down of CMOS and MEMS technology, the variation of capacitance decreases to the sub-femto-farad level. The signal charge from sensing element is weak, it is vulnerable to the dynamic coupling interference. This interference generates error charge that significantly affects accuracy of signal transmission. It is a crucial problem that how to assure the signal integrity (SI) for such a high-precision readout circuit. This paper deals with SI and EMI analysis of MEMS capacitive sensor-accelerometer/inertial sensor. And the paper demonstrates how significantly the IC-layout can contribute to the EMC performance of sub-femto-farad readout circuit for MEMS capacitive sensor. The measurement results show that the precision IC-layout reduces the equivalent input offset and improve the EMC performance of the readout circuit.

关键词： Couplings Capacitance Interference Electromagnetic compatibility Micromechanical devices Wires Clocks

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On the emergence of a new instability during core-collapse of very massive stars

arXiv

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arXiv 2021年

作者： Kalashnikov, Ilia Baranov, Andrey Chardonnet, Pascal Chechetkin, Valery Filina, Anastasia Keldysh Institute of Applied Mathematics 4 Miusskaya sq. Moscow125047 Russia Institute for Computer Aided Design Russian Academy of Sciences 19/18 2-ya Brestskaya st. Moscow123056 Russia SCAC IFA Embassy of France in Algeria 25 Chemin Abdelkader Gadouche Hydra16035 Algeria

The process of uniform supernovae explosions (SNe) is well investigated for all their types. However, observational data suggests that the SNe could be not spherically-symmetric. Modern multidimensional simulations of SNe demonstrate development of hydrodynamical instabilities during the explosion phase. But the configuration of a star and inhomogeneities prior to explosion could strongly affect how the SNe develops. In a number of papers on numerical modeling of pair-instability supernovae explosion (PISNe) considered the case when thermonuclear energy in the central region of a massive star is introduced by the series of several hot spots. It leads to the appearance of many fragments of hot matter behind the divergence shock wave. An observable manifestation of this may be the presence of peaks on light curves of gamma-ray burst associated with explosions of massive stars. The physical nature of such inhomogeneities is not evident and the number and size of spots is a conjecture. In this work, we study the possibility of formation of these inhomogeneities at the stage of the core-collapse (CC) in a massive star. To check this assumption, we chose analytic self-similar model of CC and investigated stability of solutions obtained from it with respect to small multidimensional perturbations. It shows there are no conditions where the collapse of a very massive star may remain stable, although, for a less massive star, it is possible. Using obtained relations, we found characteristic features of developing instability, thereby making it possible to estimate the amount and characteristic size of the inhomogeneities. © 2021, CC BY.

关键词： Stability

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Wave process of plastic deformation in titanium alloys determining the fracture mechanisms of compressor and fan disks on different scale levels

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AIP Conference Proceedings 2023年第1期2899卷

作者： Andrey Shanyavskiy Aleksandr Nikitin Aleksey Soldatenkov Aviation Register for Russian Federation Airport Sheremetievo-1 PO Box 54 Moscow region Chimkinskiy State 141426 Russia Institute of Computer Aided Design 2nd Brestskaya street 19/18 Moscow 123056 Russia

The processes of fatigue crack propagation in titanium compressor and fan disks of contemporary gas-turbine engines are generalized. As it was shown, the cracks in a disk material can initiate and propagate at the micro-, meso- and macroscale level depending on the crack origination location, namely, rim or hub part of disks. Crack growth mechanisms are determined by the dominant mechanism of wave process of plastic deformation for titanium alloys, which appears during forging of compressor and fan disks. This process results in creation of filament-type structure with alternating brittle and ductile filaments of two-phase titanium alloys. The features of titanium alloy fracture in the regions of high-cycle and very-high-cycle fatigue are considered. The instances of in-service failure for fan and compressor disk from titanium alloys are demonstrated, and both the duration of fatigue crack growth, and equivalent stress level are estimated.

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Analytical and Numerical Study of Biaxial Bending on VHCF Testing Machine

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Journal of Physics: Conference Series 2021年第1期1945卷

作者： A D Nikitin B A Stratula Institute for computer aided design of RAS 2-ya Brestskaya st. 123056 Moscow Russia

Modern VHCF testing regimes are studied. A new loading scheme applicable to a piezoelectric fatigue testing machine is proposed. The scheme is studied analytically and numerically. The analytical part comprises the calculation of the specimen's geometry to operate correctly on the VHCF testing machine, as well as the specimen's stress-strain state calculation during an experiment in order to determine the one's durability. A model based on a kinetic damage equation is introduced. This model is used in the numerical experiment. The behavior of a finite-element specimen in a fatigue experiment is calculated from the beginning up to the stage of active crack growth.

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Study on the Resonant Torsion Vibration in Hourglass Specimens under VHCF Loading

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Journal of Physics: Conference Series 2021年第1期1945卷

作者： I S Nikitin A D Nikitin B A Stratula Institute for Computer-Aided Design RAS 19/18 2nd Brestskaya Moscow Russia

The problem of cyclic loading under pure torsion is an important problem for numerous different industrial applications, such as shafts, springs, blades, and others. The loading conditions for aircraft, railway, automobile industries are often corresponding to long fatigue life. The rough estimation shows that the number of cycles for springs in car engine is exceeds 108 cycle while blades for aircraft turbine may undergo more than 1010 loading cycles. Such, to provide a safety in service life for such elements a multiaxial fatigue failure criterion is needed to predict damage zone location and fatigue life. This paper is aimed to introduce the multi regime approach to predict fatigue damage zone evaluation and number of cycles to crack initiation and total fatigue life. The presented approach is based on damage theory supplemented by multiaxial failure criterion. The proposed model includes the algorithm for automatic determination the fatigue loading range (low-, high- or very-high cycle fatigue) and allows different crack opening modes. To show how to apply the proposed approach and verify the results of calculation the series of numerical simulation on hourglass specimen subjected to VHCF pure torsion is performed. The results of numerical simulation are compared to VHCF torsion tests.

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Features of Application of Data Transmission Protocols in Wireless Networks of Sensors 3

Features of Application of Data Transmission Protocols in Wi...

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3rd International Conference on Advanced Information and Communications Technologies, AICT 2019

作者： Belej, Olexander Nestor, Natalia Polotai, Orest Sadeckii, Jan Department of Computer-Aided Design Lviv Polytechnic National University Lviv Ukraine Department of Information Security Management Lviv State University of Life Safety Lviv Ukraine Institute of Computer Science Opole University of Technology Opole Poland

ISBN: (纸本)9781728123998

This article discusses the vulnerabilities and complexity of designing secure IoT-solutions, and then presents proven approaches to protecting devices and gateways. Specifically, security mechanisms such as device authentication (including certificate-based authentication), device authentication, and application a verification of identification are described. The authors consider a protocol of message queue telemetry transport for speech and sensor networks on the Internet, its features, application variants, and characteristic procedures. The principle of 'publishersubscriber' is considered. An analysis of information elements and messages is carried out. The urgency of the theme is due to the rapid development of 'publisher-subscriber' architecture, for which the protocol is most characteristic. © 2019 IEEE.

关键词： Authentication

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