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Moscow University Mechanics Bulletin最新文献

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Pulsed Control of a Dangerous Asteroid in the Domain of (mathbf{1:1}) Resonance 一颗危险小行星在(mathbf{1:1})共振域的脉冲控制
IF 0.3
Moscow University Mechanics Bulletin Pub Date : 2022-07-08 DOI: 10.3103/S0027133022020054
V. A. Proshkin, A. S. Chura
{"title":"Pulsed Control of a Dangerous Asteroid in the Domain of (mathbf{1:1}) Resonance","authors":"V. A. Proshkin,&nbsp;A. S. Chura","doi":"10.3103/S0027133022020054","DOIUrl":"10.3103/S0027133022020054","url":null,"abstract":"<p>The paper investigates the possibility of pulsed control of an asteroid approaching the Earth. The control scheme is fixed: this is a two-pulse flight with a gravitational maneuver near the Earth. The purpose of the first pulse is to correct the approach to the Earth. With the help of a gravitational maneuver, the asteroid is transferred to an osculating heliocentric orbit with a period close to the period of the Earth’s revolution around the Sun. The purpose of the second pulse is to transfer the asteroid to an osculating orbit, the period of rotation of which makes long-period fluctuations near the period of the Earth. An approximate method for evaluating the feasibility of a flight is proposed. Two examples are considered: the asteroids Apophis 2004 MN4 and Duende 2012 DA14.</p>","PeriodicalId":710,"journal":{"name":"Moscow University Mechanics Bulletin","volume":"77 2","pages":"53 - 59"},"PeriodicalIF":0.3,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4344693","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}
引用次数: 0
Variation of the Size of Reachable Region of Second-Order Linear System 二阶线性系统可达区域大小的变化
IF 0.3
Moscow University Mechanics Bulletin Pub Date : 2022-07-08 DOI: 10.3103/S0027133022020029
D. I. Bugrov, M. I. Bugrova
{"title":"Variation of the Size of Reachable Region of Second-Order Linear System","authors":"D. I. Bugrov,&nbsp;M. I. Bugrova","doi":"10.3103/S0027133022020029","DOIUrl":"10.3103/S0027133022020029","url":null,"abstract":"<p>A linear time-invariant completely controllable second-order system is considered; all the eigenvalues of this system are different and have negative real parts. The control is considered to be a scalar piecewise continuous function bounded in absolute value. The size of the reachable region is defined as the maximum absolute value of the coordinates of the points of the reachable region on the phase plane. A monotonic dependence of the size of the reachable region on the parameters of the system is shown.</p>","PeriodicalId":710,"journal":{"name":"Moscow University Mechanics Bulletin","volume":"77 2","pages":"47 - 52"},"PeriodicalIF":0.3,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4342450","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}
引用次数: 0
Theory of Five-Dimensional Elastoplastic Processes of Moderate Curvature 中等曲率五维弹塑性过程理论
IF 0.3
Moscow University Mechanics Bulletin Pub Date : 2022-07-08 DOI: 10.3103/S0027133022020030
I. N. Molodtsov
{"title":"Theory of Five-Dimensional Elastoplastic Processes of Moderate Curvature","authors":"I. N. Molodtsov","doi":"10.3103/S0027133022020030","DOIUrl":"10.3103/S0027133022020030","url":null,"abstract":"<p>A variant of the constitutive equations for describing complex loading processes with deformation trajectories of arbitrary geometry and dimension is considered. The vector constitutive equations and a new method of mathematical modeling the five-dimensional complex loading processes are obtained. This method is validated for two- and three-dimensional processes of constant curvature. The constitutive equations describe the stages of active loading and unloading. Explicit representations of the stress vector in an arbitrary deformation process are obtained. It is shown that the state parameters of the model in the five-dimensional deformation space are the four angles from the representation of the stress director vector in the Frenet frame, not directly, but in the form of four special functions whose form is known. These functions are called the Vasin functions. The process of complex loading along a three-dimensional helical trajectory of deformation is also considered, where, after diving and subsequent additional loading, the equations of the steady-state loading process are established. Similar results are obtained for five-dimensional helical deformation trajectories. Hence, for this class of processes there exists a correspondence between the geometries of the deformation and reaction paths in the form of a loading path.</p>","PeriodicalId":710,"journal":{"name":"Moscow University Mechanics Bulletin","volume":"77 2","pages":"38 - 46"},"PeriodicalIF":0.3,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4339822","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}
引用次数: 1
Trigger Factors and Ways of Provoking the Seismic and Volcanic Activity 引发地震和火山活动的因素和途径
IF 0.3
Moscow University Mechanics Bulletin Pub Date : 2022-07-08 DOI: 10.3103/S0027133022020042
V. L. Natyaganov, Yu. D. Skobennikova
{"title":"Trigger Factors and Ways of Provoking the Seismic and Volcanic Activity","authors":"V. L. Natyaganov,&nbsp;Yu. D. Skobennikova","doi":"10.3103/S0027133022020042","DOIUrl":"10.3103/S0027133022020042","url":null,"abstract":"<p>The trigger factors of various nature that lead to the excitation of seismic and volcanic activity are briefly considered. Based on the solution of the generalized Boussinesq problem for half-space and typical pressure differences in medium-power typhoons, some estimates of the trigger effect of such differences on the provocation of earthquakes are given. The possible mechanisms of the trigger effect of typhoons on seismicity, before they move from the sea area to the land, are discussed.</p>","PeriodicalId":710,"journal":{"name":"Moscow University Mechanics Bulletin","volume":"77 2","pages":"33 - 37"},"PeriodicalIF":0.3,"publicationDate":"2022-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4344404","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}
引用次数: 0
Influence of Flow Velocity Variability on Pipeline Stability Boundaries 流速变异性对管道稳定边界的影响
IF 0.3
Moscow University Mechanics Bulletin Pub Date : 2022-06-09 DOI: 10.3103/S0027133022010034
V. P. Radin, V. P. Chirkov, O. V. Novikova, A. V. Shchugorev, V. N. Shchugorev
{"title":"Influence of Flow Velocity Variability on Pipeline Stability Boundaries","authors":"V. P. Radin,&nbsp;V. P. Chirkov,&nbsp;O. V. Novikova,&nbsp;A. V. Shchugorev,&nbsp;V. N. Shchugorev","doi":"10.3103/S0027133022010034","DOIUrl":"10.3103/S0027133022010034","url":null,"abstract":"<p>The paper considers parametric oscillations of a classical system under nonconservative loading—a flexible pipeline with a flowing liquid. The parametric effect on the system is determined by the variability of the fluid flow rate. The stability of the rectilinear form of the pipeline equilibrium according to the Floquet–Lyapunov theory is investigated by the monodromy matrix method. The main focus is the study of the influence the characteristics of the parametric effect have on the stability boundary position of the pipeline, assuming a harmonic deviation of the flow rate from a certain constant, in particular, the amplitude and frequency.</p>","PeriodicalId":710,"journal":{"name":"Moscow University Mechanics Bulletin","volume":"77 1","pages":"12 - 18"},"PeriodicalIF":0.3,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4392394","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}
引用次数: 0
Relation of the Modern Theory of Disperse Systems with the Classical Filtration Theory 现代分散系统理论与经典过滤理论的关系
IF 0.3
Moscow University Mechanics Bulletin Pub Date : 2022-06-09 DOI: 10.3103/S0027133022010058
Ya. D. Yankov
{"title":"Relation of the Modern Theory of Disperse Systems with the Classical Filtration Theory","authors":"Ya. D. Yankov","doi":"10.3103/S0027133022010058","DOIUrl":"10.3103/S0027133022010058","url":null,"abstract":"<p>The article examines how the filtration theory should look from the point of view of the modern theory of disperse systems, which is a nontrivial generalization of the classical theory of Brownian motion.</p>","PeriodicalId":710,"journal":{"name":"Moscow University Mechanics Bulletin","volume":"77 1","pages":"19 - 26"},"PeriodicalIF":0.3,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4391988","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}
引用次数: 0
Dynamic Model of Ship Wind Turbine with Transmission 带传动的船舶风力机动力学模型
IF 0.3
Moscow University Mechanics Bulletin Pub Date : 2022-06-09 DOI: 10.3103/S0027133022010022
M. A. Garbuz
{"title":"Dynamic Model of Ship Wind Turbine with Transmission","authors":"M. A. Garbuz","doi":"10.3103/S0027133022010022","DOIUrl":"10.3103/S0027133022010022","url":null,"abstract":"<p>We consider a mathematical model of a catamaran with a wind turbine consisting of a hull equipped with an air propeller and a water propeller. The wind-receiving propeller converts wind energy into rotational energy and transfers it via the transmission system to the propeller, which creates a pulling force. The superiority of this force over the sum of the sailing resistance of the propeller and the hydrodynamic resistance of the catamaran hull provides the possibility of upwind acceleration. The shaft system connecting the air and water propeller suggests the possibility of changing the rotation transmission ratio. Steady modes of motion have been studied, their stability has been analyzed, and parameters have been found that provide the highest hull speed when moving upwind.</p>","PeriodicalId":710,"journal":{"name":"Moscow University Mechanics Bulletin","volume":"77 1","pages":"27 - 31"},"PeriodicalIF":0.3,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4393508","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}
引用次数: 0
Variation Principles of Moment-Membrane Theory of Shells 壳的矩膜理论的变化原理
IF 0.3
Moscow University Mechanics Bulletin Pub Date : 2022-06-09 DOI: 10.3103/S0027133022010046
S. H. Sargsyan
{"title":"Variation Principles of Moment-Membrane Theory of Shells","authors":"S. H. Sargsyan","doi":"10.3103/S0027133022010046","DOIUrl":"10.3103/S0027133022010046","url":null,"abstract":"<p>In the present paper assumptions are formulated, and, on the basis of the moment theory of elasticity with independent fields of displacements and rotations, general variation principle of Hu–Washizu type is established and basic equations with boundary conditions of the moment-membrane theory of shells are set out. For the moment-membrane theory of shells particular variation principles of Lagrange and Castigliano type are proved, equations of continuity of deformations of the middle surface of the shell are derived.</p>","PeriodicalId":710,"journal":{"name":"Moscow University Mechanics Bulletin","volume":"77 1","pages":"1 - 11"},"PeriodicalIF":0.3,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4393343","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}
引用次数: 0
The Galvanic Correction of the Gaze Stabilization Neural Control: Part 1 注视稳定神经控制的电校正:第一部分
IF 0.3
Moscow University Mechanics Bulletin Pub Date : 2022-03-04 DOI: 10.3103/S0027133021060054
V. A. Sadovnichii, V. V. Aleksandrov, T. B. Aleksandrova, I. S. Konovalenko, K. V. Tikhonova, N. E. Shulenina, E. Soto
{"title":"The Galvanic Correction of the Gaze Stabilization Neural Control: Part 1","authors":"V. A. Sadovnichii,&nbsp;V. V. Aleksandrov,&nbsp;T. B. Aleksandrova,&nbsp;I. S. Konovalenko,&nbsp;K. V. Tikhonova,&nbsp;N. E. Shulenina,&nbsp;E. Soto","doi":"10.3103/S0027133021060054","DOIUrl":"10.3103/S0027133021060054","url":null,"abstract":"<p>The article shows a theoretical (part 1) improvement in the\u0000stabilization of the gaze in galvanic vestibular stimulation.</p>","PeriodicalId":710,"journal":{"name":"Moscow University Mechanics Bulletin","volume":"76 6","pages":"163 - 170"},"PeriodicalIF":0.3,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4174065","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}
引用次数: 0
Dynamics of Rigid Body with Viscous Filler: Qualitative Analysis 带粘性填料的刚体动力学:定性分析
IF 0.3
Moscow University Mechanics Bulletin Pub Date : 2022-03-04 DOI: 10.3103/S0027133021060042
A. V. Karapetyan
{"title":"Dynamics of Rigid Body with Viscous Filler: Qualitative Analysis","authors":"A. V. Karapetyan","doi":"10.3103/S0027133021060042","DOIUrl":"10.3103/S0027133021060042","url":null,"abstract":"<p>The problem of motion by inertia of a rigid body with an ellipsoidal cavity filled with a liquid in the presence of the internal friction is discussed. The global qualitative analysis of the system dynamics and the limiting motions is given.</p>","PeriodicalId":710,"journal":{"name":"Moscow University Mechanics Bulletin","volume":"76 6","pages":"171 - 175"},"PeriodicalIF":0.3,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4177142","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}
引用次数: 0
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