Pub Date : 2022-12-28DOI: 10.22337/2587-9618-2022-18-4-62-70
D. Kuznetsova, V. Lalin, N. Malkov
This article is about the nonlinear problems of the theory of elastic Cosserat – Timoshenko’s rods in the material (Lagrangian) description. The variational definition for the problem as finding the stationary point of the Lagrangian functional and differential formulation of static problems were given. The exact stability functional and stability equations of the plane problem for physically linear elastic rods taking into account the axial, shear and bending stiffnesses were received. The exact value of the critical load was obtained taking into account the axial, shear and bending deformations in the problem of the stability of a rod compressed by an axial force. In the present paper the stability of classical simplified rod’s models such as the Timoshenko beam and the Euler–Bernoulli beam was investigated. Also, the stability of third simplified rod’s model, based on beam’s axial and bending stiffnesses, was explored. The stability functionals, the stability equations and critical loads formulations for this three types of simplified models were derived as a particular case of the general theory. There were made the comparisons of described solutions which regards all the rod’s stiffnesses and solutions, based on simplified models. The effect of the axial and shear stiffnesses on rod’s stability was analyzed.
{"title":"THE EFFECT OF THE AXIAL AND SHEAR STIFFNESSES ON ELASTIC ROD’S STABILITY","authors":"D. Kuznetsova, V. Lalin, N. Malkov","doi":"10.22337/2587-9618-2022-18-4-62-70","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-4-62-70","url":null,"abstract":"This article is about the nonlinear problems of the theory of elastic Cosserat – Timoshenko’s rods in the material (Lagrangian) description. The variational definition for the problem as finding the stationary point of the Lagrangian functional and differential formulation of static problems were given. The exact stability functional and stability equations of the plane problem for physically linear elastic rods taking into account the axial, shear and bending stiffnesses were received. The exact value of the critical load was obtained taking into account the axial, shear and bending deformations in the problem of the stability of a rod compressed by an axial force. In the present paper the stability of classical simplified rod’s models such as the Timoshenko beam and the Euler–Bernoulli beam was investigated. Also, the stability of third simplified rod’s model, based on beam’s axial and bending stiffnesses, was explored. The stability functionals, the stability equations and critical loads formulations for this three types of simplified models were derived as a particular case of the general theory. There were made the comparisons of described solutions which regards all the rod’s stiffnesses and solutions, based on simplified models. The effect of the axial and shear stiffnesses on rod’s stability was analyzed.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"107 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75860597","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}
Pub Date : 2022-12-28DOI: 10.22337/2587-9618-2022-18-4-14-22
V. Smirnov, M. Smolyakov
This article proposes a solution for structural materials such as concrete and cement mortars dynamic properties investigation using experimental modal analysis technique. The studied dynamic characteristics of structural materials include the dynamic modulus of elasticity and the loss factor or its derivatives: the logarithmic oscillation decrement or the relative damping coefficient. Closed expressions are presented for determining the loss factor of mechanical vibrations, obtained on the basis of solving the differential equation for vibrations of a single-mass dynamic system. A method for calculating the loss factor based on the analysis of the spectrum of the transfer function of an oscillatory system loaded with an impulsive dynamic force is presented, in which the results of measuring accelerations at various points of the sample are used as a response. The experiments were carried out on short and long samples made from samples of structural materials - cement mortars with a density of 1500 - 1900 kg/m3 with special aggregates. Based on the solution of the equation of oscillations of a beam with distributed masses, a formula is presented for determining the dynamic modulus of elasticity of the beam material.
{"title":"EXPERIMENTAL METHOD FOR STRUCTURAL CONCRETE DAMPING PROPERTIES EVALUATION","authors":"V. Smirnov, M. Smolyakov","doi":"10.22337/2587-9618-2022-18-4-14-22","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-4-14-22","url":null,"abstract":"This article proposes a solution for structural materials such as concrete and cement mortars dynamic properties investigation using experimental modal analysis technique. The studied dynamic characteristics of structural materials include the dynamic modulus of elasticity and the loss factor or its derivatives: the logarithmic oscillation decrement or the relative damping coefficient. Closed expressions are presented for determining the loss factor of mechanical vibrations, obtained on the basis of solving the differential equation for vibrations of a single-mass dynamic system. A method for calculating the loss factor based on the analysis of the spectrum of the transfer function of an oscillatory system loaded with an impulsive dynamic force is presented, in which the results of measuring accelerations at various points of the sample are used as a response. The experiments were carried out on short and long samples made from samples of structural materials - cement mortars with a density of 1500 - 1900 kg/m3 with special aggregates. Based on the solution of the equation of oscillations of a beam with distributed masses, a formula is presented for determining the dynamic modulus of elasticity of the beam material.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79308431","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}
Pub Date : 2022-12-28DOI: 10.22337/2587-9618-2022-18-4-124-131
V. Sidorov, E. Badina, R. Tsarev
In this paper, the problem of numerical dynamic calculation of a beam made of composite material with a developed internal structure is considered. The elastic properties are assumed to be nonlocal in time. A short review of the existing methods for mathematical modeling of the dynamic behavior of elements with a developed internal structure was carried out. A non-local in time model of dynamic deformation of a bending beam is constructed. Since the finite element analysis (FEA) is the most demanded numerical method for mechanical systems analysis, a non-local dynamic deformation model is integrated into the algorithm of this method. The equilibrium equation of the structure in motion is solved by an explicit scheme. The damping matrix is obtained from the condition of stationarity of the total deformation energy of a moving mechanical system. A one-dimensional non-local in time model was implemented in the MATLAB software package.
{"title":"DYNAMIC MODEL OF BEAM DEFORMATION WITH CONSIDER NONLOCAL IN TIME ELASTIC PROPERTIES OF THE MATERIAL","authors":"V. Sidorov, E. Badina, R. Tsarev","doi":"10.22337/2587-9618-2022-18-4-124-131","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-4-124-131","url":null,"abstract":"In this paper, the problem of numerical dynamic calculation of a beam made of composite material with a developed internal structure is considered. The elastic properties are assumed to be nonlocal in time. A short review of the existing methods for mathematical modeling of the dynamic behavior of elements with a developed internal structure was carried out. A non-local in time model of dynamic deformation of a bending beam is constructed. Since the finite element analysis (FEA) is the most demanded numerical method for mechanical systems analysis, a non-local dynamic deformation model is integrated into the algorithm of this method. The equilibrium equation of the structure in motion is solved by an explicit scheme. The damping matrix is obtained from the condition of stationarity of the total deformation energy of a moving mechanical system. A one-dimensional non-local in time model was implemented in the MATLAB software package.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78734019","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}
Pub Date : 2022-12-28DOI: 10.22337/2587-9618-2022-18-4-39-48
A. Danilin, E. Onuchin, Valery Feldshteyn
In the operation practice of overhead power transmission lines (OHL), the phenomenon of "galloping" of conductors is well known – vibrations with frequencies of ~ 1 Hz and with amplitudes of the order of the static sag [1, 2]. This phenomenon is observed, as a rule, when the symmetry of the conductor section is violated due to icy deposits, which gives the conductor some aerodynamic efficiency. However, this model does not explain all the observed cases of galloping. In this regard, it is advisable to pay attention to the little-known experience of Academician Abram F. Ioffe, who experimentally discovered the self-excitation of a current-carrying conductor – a stretched string that heats up when connected to an electrical circuit. Solving this issue can significantly expand the understanding of the nature of conductor galloping and open up new ways to fend off this phenomenon, which poses a danger to the stability of the functioning of energy systems. This requires a mathematical model of the OHL conductor describing the interaction of mechanical and thermal processes. The purpose of this work is to construct the simplest version of this model, on the basis of which the condition of self-excitation of thermomechanical self-excitation of real OHL conductors can be justified.
{"title":"MODEL OF THERMOMECHANICAL VIBRATIONS OF CURRENT-CARRYING CONDUCTORS","authors":"A. Danilin, E. Onuchin, Valery Feldshteyn","doi":"10.22337/2587-9618-2022-18-4-39-48","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-4-39-48","url":null,"abstract":"In the operation practice of overhead power transmission lines (OHL), the phenomenon of \"galloping\" of conductors is well known – vibrations with frequencies of ~ 1 Hz and with amplitudes of the order of the static sag [1, 2]. This phenomenon is observed, as a rule, when the symmetry of the conductor section is violated due to icy deposits, which gives the conductor some aerodynamic efficiency. However, this model does not explain all the observed cases of galloping. In this regard, it is advisable to pay attention to the little-known experience of Academician Abram F. Ioffe, who experimentally discovered the self-excitation of a current-carrying conductor – a stretched string that heats up when connected to an electrical circuit. Solving this issue can significantly expand the understanding of the nature of conductor galloping and open up new ways to fend off this phenomenon, which poses a danger to the stability of the functioning of energy systems. This requires a mathematical model of the OHL conductor describing the interaction of mechanical and thermal processes. The purpose of this work is to construct the simplest version of this model, on the basis of which the condition of self-excitation of thermomechanical self-excitation of real OHL conductors can be justified.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75525017","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}
Pub Date : 2022-09-30DOI: 10.22337/2587-9618-2022-18-3-25-36
G. Manuylov, S. Kosytsyn, M. Begichev
The problems of stability of some beams, Π-shaped frames and cylindrical shells with the elasto-plastic material are considered. The possibility of modeling bars using finite elements of various types is studied. Plate elements and even one-dimensional beam finite elements can be used for modelling compressed rods with geometric and physical nonlinearity. For the problem of stability of a circular cylindrical shell is given the comparison of the authors' results obtained using the FEM with the experimental results of V.G. Sazonov and the calculations of A.V. Karmishin.
{"title":"ON THE CALCULATIONS FOR THE STABILITY OF BEAMS, FRAMES, AND CYLINDRICAL SHELLS IN THE ELASTO-PLASTIC STAGE","authors":"G. Manuylov, S. Kosytsyn, M. Begichev","doi":"10.22337/2587-9618-2022-18-3-25-36","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-3-25-36","url":null,"abstract":"The problems of stability of some beams, Π-shaped frames and cylindrical shells with the elasto-plastic material are considered. The possibility of modeling bars using finite elements of various types is studied. Plate elements and even one-dimensional beam finite elements can be used for modelling compressed rods with geometric and physical nonlinearity. For the problem of stability of a circular cylindrical shell is given the comparison of the authors' results obtained using the FEM with the experimental results of V.G. Sazonov and the calculations of A.V. Karmishin.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84696109","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}
Pub Date : 2022-09-30DOI: 10.22337/2587-9618-2022-18-3-114-125
V. Musayev
The problem of mathematical modeling of unsteady seismic waves in an elastic half-plane with a ver-tical rectangular cavity filled with water is considered. The problem of modeling problems of the transition peri-od is an actual scientific problem. A quasi-regular approach is proposed to solve a system of linear ordinary dif-ferential equations of the second order in displacements with initial conditions and to approximate the region un-der study. The method is based on the schemes: a point, a line and a plane. An algorithm and a set of programs for solving flat (two-dimensional) problems that allow obtaining a stress-strain state in complex objects have been developed. To assess the reliability of the developed methodology, algorithm and software package, the problem of the effect of a plane longitudinal wave in the form of a Heaviside function on an elastic half-plane was solved. The numerical solution corresponds quantitatively to the analytical solution. The problem of mathe-matical modeling of unsteady elastic stress waves in a half-plane with a cavity filled with water (the ratio of width to height is one to ten) under seismic influence is solved. A system of equations consisting of 8016008 un-knowns is solved. Contour stresses and components of the stress tensor are obtained in the characteristic areas of the problem under study. A cavity filled with water, with a width-to-height ratio of one to ten, reduces the amount of elastic contour stress.
{"title":"MODELING OF SEISMIC WAVES STRESSES IN A HALF-PLANE WITH A VERTICAL CAVITY FILLED WITH WATER (THE RATIO OF WIDTH TO HEIGHT IS ONE TO TEN)","authors":"V. Musayev","doi":"10.22337/2587-9618-2022-18-3-114-125","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-3-114-125","url":null,"abstract":"The problem of mathematical modeling of unsteady seismic waves in an elastic half-plane with a ver-tical rectangular cavity filled with water is considered. The problem of modeling problems of the transition peri-od is an actual scientific problem. A quasi-regular approach is proposed to solve a system of linear ordinary dif-ferential equations of the second order in displacements with initial conditions and to approximate the region un-der study. The method is based on the schemes: a point, a line and a plane. An algorithm and a set of programs for solving flat (two-dimensional) problems that allow obtaining a stress-strain state in complex objects have been developed. To assess the reliability of the developed methodology, algorithm and software package, the problem of the effect of a plane longitudinal wave in the form of a Heaviside function on an elastic half-plane was solved. The numerical solution corresponds quantitatively to the analytical solution. The problem of mathe-matical modeling of unsteady elastic stress waves in a half-plane with a cavity filled with water (the ratio of width to height is one to ten) under seismic influence is solved. A system of equations consisting of 8016008 un-knowns is solved. Contour stresses and components of the stress tensor are obtained in the characteristic areas of the problem under study. A cavity filled with water, with a width-to-height ratio of one to ten, reduces the amount of elastic contour stress.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77862907","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}
Pub Date : 2022-09-27DOI: 10.22337/2587-9618-2022-18-3-37-43
Валерий Люблинский
В работе рассмотрены вопросы нелинейного поведения сдвиговых связей, влияющих на изменение распределения напряжений и деформаций в вертикальных конструкциях, а также сопоставление этих напряжений и деформаций с линейной постановкой решения задачи, в которой податливость связей постоянна. . В сложной многосвязной системе многоэтажного здания возникает новое перераспределение напряжений, не совпадающее с первоначальным распределением напряжений. Для корректировки значения жесткости связей использовались экспериментальные данные. Модуль секущей использовался для определения жесткости вертикальных швов. Загрузка производилась ступенчатым методом. На предельной стадии нагружения перераспределение напряжений в несущих элементах здания показало их значительное нивелирование. Требует обсуждения вопрос о предельных деформациях связей сдвига, ограничивающих процесс перераспределения напряжений и деформаций.
{"title":"ВЛИЯНИЕ ЖЕСТКОСТИ СВЯЗЕЙ СДВИГА НА НАПРЯЖЕННО-ДЕФОРМИРОВАННОЕ СОСТОЯНИЕ МНОГОЭТАЖНЫХ ЗДАНИЙ","authors":"Валерий Люблинский","doi":"10.22337/2587-9618-2022-18-3-37-43","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-3-37-43","url":null,"abstract":"В работе рассмотрены вопросы нелинейного поведения сдвиговых связей, влияющих на изменение распределения напряжений и деформаций в вертикальных конструкциях, а также сопоставление этих напряжений и деформаций с линейной постановкой решения задачи, в которой податливость связей постоянна. . \u0000В сложной многосвязной системе многоэтажного здания возникает новое перераспределение напряжений, не совпадающее с первоначальным распределением напряжений. Для корректировки значения жесткости связей использовались экспериментальные данные. Модуль секущей использовался для определения жесткости вертикальных швов. Загрузка производилась ступенчатым методом. На предельной стадии нагружения перераспределение напряжений в несущих элементах здания показало их значительное нивелирование. Требует обсуждения вопрос о предельных деформациях связей сдвига, ограничивающих процесс перераспределения напряжений и деформаций.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"157 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81959350","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}
Pub Date : 2022-09-27DOI: 10.22337/2587-9618-2022-18-3-147-158
A. Valiullin, A. Danilin, Valery Feldshteyn
The phenomenon of self-excitation of thermomechanical vibrations of current-carrying conductors, experimentally discovered by academician A.F. Ioffe, is of practical interest as a possible explanation of the phenomenon of galloping conductors of overhead power transmission lines (OHL) – low-frequency vibrations with frequencies of ~ 1 Hz and with amplitudes of the order of the static conductor sagging. To build the theoretical foundations of this phenomenon, as a special class of self-oscillating systems, it is necessary, first of all, a model of conductor vibrations in the OHL span. With regard to the most studied type of conductor vibrations, high-frequency aeolian vibration, excited by sign-alternating aerodynamic forces from the Karman vortex street, the classical model of a straight string is reasonably applied. However, to study low-frequency vibrations of the galloping type, it is necessary to take into account the effect of sagging of the conductor, the associated elastic tension and, in some cases, the nonlinear nature of the vibrations. The article presents two models for calculating the natural vibrations of sagging conductors (cables) within the framework of the technical theory of flexible threads, assuming the constancy of the tension force along the length. The first model describes linear oscillations of an elastic conductor in the sagging plane. For a system of equations with respect to the displacement components given in natural coordinates, an exact solution of the Sturm-Liouville problem with estimates of the frequency ranges arising is obtained. The second model describes nonlinear vibrations of an elastic conductor in the sagging plane and pendulum vibrations accompanied by an exit from it. The solution of the problem is based on the principle of possible displacements using the Ritz method. The structure of the frequency spectrum and the natural forms of transverse vibrations are studied. The developed models are intended for further investigation of thermomechanical vibrations of conductor and flexible cable systems.
{"title":"NORMAL VIBRATIONS OF SAGGING CONDUCTORS OF OVERHEAD POWER LINES","authors":"A. Valiullin, A. Danilin, Valery Feldshteyn","doi":"10.22337/2587-9618-2022-18-3-147-158","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-3-147-158","url":null,"abstract":"The phenomenon of self-excitation of thermomechanical vibrations of current-carrying conductors, experimentally discovered by academician A.F. Ioffe, is of practical interest as a possible explanation of the phenomenon of galloping conductors of overhead power transmission lines (OHL) – low-frequency vibrations with frequencies of ~ 1 Hz and with amplitudes of the order of the static conductor sagging. To build the theoretical foundations of this phenomenon, as a special class of self-oscillating systems, it is necessary, first of all, a model of conductor vibrations in the OHL span. With regard to the most studied type of conductor vibrations, high-frequency aeolian vibration, excited by sign-alternating aerodynamic forces from the Karman vortex street, the classical model of a straight string is reasonably applied. However, to study low-frequency vibrations of the galloping type, it is necessary to take into account the effect of sagging of the conductor, the associated elastic tension and, in some cases, the nonlinear nature of the vibrations. The article presents two models for calculating the natural vibrations of sagging conductors (cables) within the framework of the technical theory of flexible threads, assuming the constancy of the tension force along the length. The first model describes linear oscillations of an elastic conductor in the sagging plane. For a system of equations with respect to the displacement components given in natural coordinates, an exact solution of the Sturm-Liouville problem with estimates of the frequency ranges arising is obtained. The second model describes nonlinear vibrations of an elastic conductor in the sagging plane and pendulum vibrations accompanied by an exit from it. The solution of the problem is based on the principle of possible displacements using the Ritz method. The structure of the frequency spectrum and the natural forms of transverse vibrations are studied. The developed models are intended for further investigation of thermomechanical vibrations of conductor and flexible cable systems.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78726606","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}
Pub Date : 2022-09-27DOI: 10.22337/2587-9618-2022-18-3-44-53
V. Telichenko, Yurii Sumerkin
The article provides an example of modeling the microclimate of a residential courtyard during renovation in conditions of high-density urban development. Modeling is carried out on the basis of a bioclimatic indicator - the environmental heat load index (TNS-index). The calculations are based on the method for analysis temperature radiation and determining the angel factors between a black glob temperature to the surrounding the given platforms of side of residential courtyard. The method shows a good reflection on changes in spatial planning, architectural and construction solutions, landscaping, aeration of the yard, etc. This allows to comprehensively assessing the degree of comfort of the microclimate of the courtyard for specific weather conditions.
{"title":"MODELING OF THE MICROCLIMATE OF A RESIDENTIAL COURTYARD DURING RENOVATION","authors":"V. Telichenko, Yurii Sumerkin","doi":"10.22337/2587-9618-2022-18-3-44-53","DOIUrl":"https://doi.org/10.22337/2587-9618-2022-18-3-44-53","url":null,"abstract":"The article provides an example of modeling the microclimate of a residential courtyard during renovation in conditions of high-density urban development. Modeling is carried out on the basis of a bioclimatic indicator - the environmental heat load index (TNS-index). The calculations are based on the method for analysis temperature radiation and determining the angel factors between a black glob temperature to the surrounding the given platforms of side of residential courtyard. The method shows a good reflection on changes in spatial planning, architectural and construction solutions, landscaping, aeration of the yard, etc. This allows to comprehensively assessing the degree of comfort of the microclimate of the courtyard for specific weather conditions.","PeriodicalId":36116,"journal":{"name":"International Journal for Computational Civil and Structural Engineering","volume":"379 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84959875","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}
Pub Date : 2022-09-27DOI: 10.22337/2587-9618-2022-18-3-54-64
C. El-Nouty, D. Filatova
Introduced in 2018 the generalized bifractional Brownian motion is considered as an element of the quasi-helix with approximately stationary increment class of real centered Gaussian processes conditioning by parameters. This paper proves that the generalized bifractional Brownian motion is an element of the above mentioned class with no condition on parameters. The quasi-helix with approximately stationary increment class of real centered Gaussian processes is extended to two-dimensional processes as the fractional Brownian sheet, the sub-fractional Brownian sheet, and the bifractional Brownian sheet. This generalized presentation of the class of stochastic processes is used to augment the training samples for generative adversarial networks in computer vision problem.
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