COMPUTATIONAL MECHANICS AND MODERN APPLIED SOFTWARE SYSTEMS (CMMASS’2019)最新文献

{"title":"Preface: Computational Mechanics and Modern Applied Software Systems (CMMASS’2019)","authors":"GodymchukAnna, MikilyanMarine, ZykovaAnna, OfforPeter Ogbuna","doi":"10.1063/1.5135660","DOIUrl":"https://doi.org/10.1063/1.5135660","url":null,"abstract":"","PeriodicalId":268263,"journal":{"name":"COMPUTATIONAL MECHANICS AND MODERN APPLIED SOFTWARE SYSTEMS (CMMASS’2019)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122038369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mathematical modeling of heat transfer in anisotropic plate with internal sinks","authors":"V. Formalev, S. Kolesnik, B. A. Garibyan","doi":"10.1063/1.5135663","DOIUrl":"https://doi.org/10.1063/1.5135663","url":null,"abstract":"In this paper, based on the obtained for the first time analytical solution to the problem of heat conduction in an anisotropic plate with sinks of thermal energy, unsteady heat transfer under the influence of heat fluxes distributed along its boundaries is investigated. Using the obtained solution, the temperature field distributions were studied subject to changes in the components and the orientation angles of the principal axes of the thermal conductivity tensor. It was shown that in the presence of thermal energy sinks inside the plate, temperature fields are localized and limited by limiting isotherms as the time increases. This makes it practically possible to concentrate the high-temperature region in the vicinity of boundary heat fluxes, leaving the peripheral sections of the plate cold.In this paper, based on the obtained for the first time analytical solution to the problem of heat conduction in an anisotropic plate with sinks of thermal energy, unsteady heat transfer under the influence of heat fluxes distributed along its boundaries is investigated. Using the obtained solution, the temperature field distributions were studied subject to changes in the components and the orientation angles of the principal axes of the thermal conductivity tensor. It was shown that in the presence of thermal energy sinks inside the plate, temperature fields are localized and limited by limiting isotherms as the time increases. This makes it practically possible to concentrate the high-temperature region in the vicinity of boundary heat fluxes, leaving the peripheral sections of the plate cold.","PeriodicalId":268263,"journal":{"name":"COMPUTATIONAL MECHANICS AND MODERN APPLIED SOFTWARE SYSTEMS (CMMASS’2019)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123495157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On solutions of navigation inverse problems in real time","authors":"N. Subbotina","doi":"10.1063/1.5135679","DOIUrl":"https://doi.org/10.1063/1.5135679","url":null,"abstract":"","PeriodicalId":268263,"journal":{"name":"COMPUTATIONAL MECHANICS AND MODERN APPLIED SOFTWARE SYSTEMS (CMMASS’2019)","volume":"206 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131983617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-density polyethylene extreme deformation in laboratory ballistic launchers","authors":"N. V. Bykov, M. S. Tovarnov","doi":"10.1063/1.5135666","DOIUrl":"https://doi.org/10.1063/1.5135666","url":null,"abstract":"The paper is devoted to the study of high-speed extrusion of polyethylene in the conical nozzle of a ballistic laboratory launcher. The acceleration of the assembly, consisting of a cylindrical polyethylene piston and two metal cylinders located in front of and behind it, is carried out using a compressed gas ballistic launcher. For a theoretical description of the assembly acceleration and extrusion of polyethylene, a quasi-one-dimensional mathematical model is utilized. Polyethylene is considered as a viscoplastic fluid. Equations are solved by a numerical method on a moving mesh. The two-dimensional axisymmetric problem is solved using ANSYS Autodyn package. Experimental studies are carried out on a ballistic laboratory setup, accelerating the assembly to speeds of 572 m/s and 900 m/s. Good agreement of theoretical and experimental results are shown. As a result of the study, it was shown that the speed of the front metal element increases one and a half times compared with the speed of entry. The analysis of the possibility of accelerating the projectile was performed using the effect of extrusion and without it. It was shown that extrusion gives an increase in speed for projectiles of small mass.The paper is devoted to the study of high-speed extrusion of polyethylene in the conical nozzle of a ballistic laboratory launcher. The acceleration of the assembly, consisting of a cylindrical polyethylene piston and two metal cylinders located in front of and behind it, is carried out using a compressed gas ballistic launcher. For a theoretical description of the assembly acceleration and extrusion of polyethylene, a quasi-one-dimensional mathematical model is utilized. Polyethylene is considered as a viscoplastic fluid. Equations are solved by a numerical method on a moving mesh. The two-dimensional axisymmetric problem is solved using ANSYS Autodyn package. Experimental studies are carried out on a ballistic laboratory setup, accelerating the assembly to speeds of 572 m/s and 900 m/s. Good agreement of theoretical and experimental results are shown. As a result of the study, it was shown that the speed of the front metal element increases one and a half times compared with the speed of entry. The anal...","PeriodicalId":268263,"journal":{"name":"COMPUTATIONAL MECHANICS AND MODERN APPLIED SOFTWARE SYSTEMS (CMMASS’2019)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122733675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulation of supersonic gas flow with binary particle admixture over a blunt body","authors":"D. Reviznikov, A. Sposobin","doi":"10.1063/1.5135692","DOIUrl":"https://doi.org/10.1063/1.5135692","url":null,"abstract":"The paper is focused on the study of supersonic gas flows with suspended particles past blunt bodies. Flows with particles of two different sizes are considered. The main feature of the issue under investigation is the significant difference of characteristic scales for carrying and dispersed phases. The study is based on a complex mathematical model of the two-phase flow. The model combines Eulerian description for the gas phase and Lagrangian description for the dispersed phase. The carrying phase dynamics is governed by modified Euler equations, taking into consideration the particle-gas interaction. To account for inter-particle collisions and interaction of particles with the body surface, direct numerical simulation is used. The results of mathematical modeling for a supersonic flow with binary particle admixture around a sphere are presented. The focus is on the analysis of the effects related to the influence of the interaction between particles of different size on the energy flux from the dispersed phase to the sphere surface. The results show that energy fluxes from the individual dispersed fractions to the body surface are nonlinear functions of the particle volume concentrations. Collisions between particles of different size give significant rise to the impact of smaller particles. At the same time, the total energy flux from the dispersed phase to the body surface changes almost linearly with the concentration of individual fractions. This allows using the results of monodispersed flow calculation for modeling of polydispersed flows.The paper is focused on the study of supersonic gas flows with suspended particles past blunt bodies. Flows with particles of two different sizes are considered. The main feature of the issue under investigation is the significant difference of characteristic scales for carrying and dispersed phases. The study is based on a complex mathematical model of the two-phase flow. The model combines Eulerian description for the gas phase and Lagrangian description for the dispersed phase. The carrying phase dynamics is governed by modified Euler equations, taking into consideration the particle-gas interaction. To account for inter-particle collisions and interaction of particles with the body surface, direct numerical simulation is used. The results of mathematical modeling for a supersonic flow with binary particle admixture around a sphere are presented. The focus is on the analysis of the effects related to the influence of the interaction between particles of different size on the energy flux from the disper...","PeriodicalId":268263,"journal":{"name":"COMPUTATIONAL MECHANICS AND MODERN APPLIED SOFTWARE SYSTEMS (CMMASS’2019)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123148858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Methods of rational decision making in multi-agent systems for evaluating the effectiveness of innovations","authors":"V. Osipov, Aleksei Posadskii, T. Sivakova","doi":"10.1063/1.5135691","DOIUrl":"https://doi.org/10.1063/1.5135691","url":null,"abstract":"The work is devoted to research and development of new meta-heuristic methods and algorithms of rational choice, planning and optimization of management decisions. The search for a solution is carried out using a multi-agent approach, which can be used to evaluate innovative activities. The scientific novelty of the proposed multi-agent technology lies in the fact that intelligent agents act on the basis of a function of fuzzy preferences. An original method is proposed for determining fuzzy judgments of agents, which combines the approaches used today with fuzzy automatic control based on expert judgments and the idea of dividing the criteria space into areas proposed by the authors in the method of combined decision support. The scientific significance of solving such problems is manifested in the case of a high dimensionality of the vector criterion and optimized parameters of the domain model, as well as in the case of complex algorithmic rules of the business model of innovative development. For this purpose, a software prototype of an environment for integrating distributed agents in a single information space has been developed to search for management solutions that are close to optimal. The proposed approach, based on fuzzy judgments of agents, will optimize the development programs of innovatively active enterprises and solve scientifically significant large-scale tasks of scheduling.The work is devoted to research and development of new meta-heuristic methods and algorithms of rational choice, planning and optimization of management decisions. The search for a solution is carried out using a multi-agent approach, which can be used to evaluate innovative activities. The scientific novelty of the proposed multi-agent technology lies in the fact that intelligent agents act on the basis of a function of fuzzy preferences. An original method is proposed for determining fuzzy judgments of agents, which combines the approaches used today with fuzzy automatic control based on expert judgments and the idea of dividing the criteria space into areas proposed by the authors in the method of combined decision support. The scientific significance of solving such problems is manifested in the case of a high dimensionality of the vector criterion and optimized parameters of the domain model, as well as in the case of complex algorithmic rules of the business model of innovative development. For this...","PeriodicalId":268263,"journal":{"name":"COMPUTATIONAL MECHANICS AND MODERN APPLIED SOFTWARE SYSTEMS (CMMASS’2019)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126425172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Decision algorithm with uncertainties in a multi-purpose flight safety system","authors":"T. Korotkova, Yana Kuzmina","doi":"10.1063/1.5135664","DOIUrl":"https://doi.org/10.1063/1.5135664","url":null,"abstract":"The impact of electromagnetic radiation in the discharge of atmospheric electricity can lead to failure of the onboard electronic equipment. The creation of systems for the early detection of zones with increased electrical activity of the atmosphere is an urgent task. Decision making in such a system is complicated by the presence of several criteria depending on uncertain factors. A two-level algorithm is proposed that implements the principle of a guaranteed result with the superposition of Pareto optimal sets of the opposite direction. Values of generalized performance criteria are set with a step of discreteness. This is due to the discrete flow of information from measuring instruments. The software is created in the form of a package of modules with the possibility of upgrading. The time to implement the algorithm depends on the dimension of the input data. A solution can be obtained in a finite number of iterations.The impact of electromagnetic radiation in the discharge of atmospheric electricity can lead to failure of the onboard electronic equipment. The creation of systems for the early detection of zones with increased electrical activity of the atmosphere is an urgent task. Decision making in such a system is complicated by the presence of several criteria depending on uncertain factors. A two-level algorithm is proposed that implements the principle of a guaranteed result with the superposition of Pareto optimal sets of the opposite direction. Values of generalized performance criteria are set with a step of discreteness. This is due to the discrete flow of information from measuring instruments. The software is created in the form of a package of modules with the possibility of upgrading. The time to implement the algorithm depends on the dimension of the input data. A solution can be obtained in a finite number of iterations.","PeriodicalId":268263,"journal":{"name":"COMPUTATIONAL MECHANICS AND MODERN APPLIED SOFTWARE SYSTEMS (CMMASS’2019)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116805694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Forced and free vibrations of thin composite plate with free layer damping located in the air","authors":"V. Paimushin, R. Gazizullin","doi":"10.1063/1.5135665","DOIUrl":"https://doi.org/10.1063/1.5135665","url":null,"abstract":"The paper studies two coupled problems: the problem of free vibrations of a composite plate with a free layer damping made of a vibration-absorbing material with a large logarithmic decrement of vibrations, as well as the problem of forced vibrations of the plate described above under the action of a flat monoharmonic sound wave incident on it. The aerohydrodynamic interaction of a plate with acoustic media surrounding a plate is described by the generalized three-dimensional Helmholtz wave equations with the introduction of the complex sound speed to consider the energy dissipation. The mechanical behavior of a two-layer plate is described by the Kirchhoff-Love model. For the case of hinged support of the plate edges, exact analytical solutions of the problems were found. Comparison of the results obtained for a single-layer plate and a two-layer plate with a free layer damping made of rubber shows that the use of coatings with high internal damping properties (and, consequently, energy-absorbing properties) can significantly reduce the amplitude values of deformations and displacements in the plate even under resonant modes of loading, thereby forming a reduced level of sound pressure radiated by the plate.The paper studies two coupled problems: the problem of free vibrations of a composite plate with a free layer damping made of a vibration-absorbing material with a large logarithmic decrement of vibrations, as well as the problem of forced vibrations of the plate described above under the action of a flat monoharmonic sound wave incident on it. The aerohydrodynamic interaction of a plate with acoustic media surrounding a plate is described by the generalized three-dimensional Helmholtz wave equations with the introduction of the complex sound speed to consider the energy dissipation. The mechanical behavior of a two-layer plate is described by the Kirchhoff-Love model. For the case of hinged support of the plate edges, exact analytical solutions of the problems were found. Comparison of the results obtained for a single-layer plate and a two-layer plate with a free layer damping made of rubber shows that the use of coatings with high internal damping properties (and, consequently, energy-absorbing propert...","PeriodicalId":268263,"journal":{"name":"COMPUTATIONAL MECHANICS AND MODERN APPLIED SOFTWARE SYSTEMS (CMMASS’2019)","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123045245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pressure build-up test under elastic-wave action on the reservoir","authors":"E. Marfin, A. Gavrilov, A. Abdrashitov, A. Kadyirov","doi":"10.1063/1.5135678","DOIUrl":"https://doi.org/10.1063/1.5135678","url":null,"abstract":"The influence of elastic vibrations on productive reservoirs increases oil extraction since filtration properties of a saturated collector change under the influence of elastic waves. Viscosity of reservoir fluids decreases and the permeability of a porous medium grows. The changes in filtration properties may be found using the results of hydrodynamic methods of boreholes research. The present work studies the prospects of applying pressure build-up tests at the wells start-up and shutdown to evaluate the changes in properties of productive reservoir. A mathematical model of plane-parallel filtration was developed for classical elastic mode applying to porous medium with heterogeneity of properties due to acoustic influence. A model reservoir is studied with parameters corresponding to a real field. A comparison of computational data was carried out for homogeneous and heterogeneous reservoirs about the change in the way pressure build-up of wells depends on time when shutting down wells. It has been shown that hydrodynamic pressure build-up research of the well before and after the acoustic treatment on the reservoir allows estimating the changes in reservoir properties caused by the treatment.The influence of elastic vibrations on productive reservoirs increases oil extraction since filtration properties of a saturated collector change under the influence of elastic waves. Viscosity of reservoir fluids decreases and the permeability of a porous medium grows. The changes in filtration properties may be found using the results of hydrodynamic methods of boreholes research. The present work studies the prospects of applying pressure build-up tests at the wells start-up and shutdown to evaluate the changes in properties of productive reservoir. A mathematical model of plane-parallel filtration was developed for classical elastic mode applying to porous medium with heterogeneity of properties due to acoustic influence. A model reservoir is studied with parameters corresponding to a real field. A comparison of computational data was carried out for homogeneous and heterogeneous reservoirs about the change in the way pressure build-up of wells depends on time when shutting down wells. It has been sho...","PeriodicalId":268263,"journal":{"name":"COMPUTATIONAL MECHANICS AND MODERN APPLIED SOFTWARE SYSTEMS (CMMASS’2019)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130290238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical study on the rotation of meteoroid fragments during their separation in the atmosphere","authors":"V. Lukashenko, F. Maksimov","doi":"10.1063/1.5135667","DOIUrl":"https://doi.org/10.1063/1.5135667","url":null,"abstract":"An algorithm for solving adjoint aerodynamic and ballistic problems is proposed to investigate a flight of a system of bodies in the atmosphere, taking into account their relative movement and rotation. The algorithm is used to study the separation of two identical bodies of rectangular shape with the account of rotation. Rotation leads to the separation of the bodies not only under the acting pushing aerodynamic force, but also under additional lateral force due to the angle of attack of the bodies. The separation velocity of two rotating meteor fragments may increase up to three times comparing to the calculations where it is assumed that bodies do not rotate. This study was carried out in order to estimate the influence of various factors on the separation velocity of meteoroid fragments after destruction of a parent body and the change of their trajectories after fragmentation.An algorithm for solving adjoint aerodynamic and ballistic problems is proposed to investigate a flight of a system of bodies in the atmosphere, taking into account their relative movement and rotation. The algorithm is used to study the separation of two identical bodies of rectangular shape with the account of rotation. Rotation leads to the separation of the bodies not only under the acting pushing aerodynamic force, but also under additional lateral force due to the angle of attack of the bodies. The separation velocity of two rotating meteor fragments may increase up to three times comparing to the calculations where it is assumed that bodies do not rotate. This study was carried out in order to estimate the influence of various factors on the separation velocity of meteoroid fragments after destruction of a parent body and the change of their trajectories after fragmentation.","PeriodicalId":268263,"journal":{"name":"COMPUTATIONAL MECHANICS AND MODERN APPLIED SOFTWARE SYSTEMS (CMMASS’2019)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132412692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}