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Moscow University Mechanics Bulletin最新文献

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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
On the Positive Definiteness of the Poincaré–Steklov Operator for Elastic Half-Plane 弹性半平面上poincar_3 - steklov算子的正确定性
IF 0.3
Moscow University Mechanics Bulletin Pub Date : 2022-03-04 DOI: 10.3103/S0027133021060029
A. A. Bobylev
{"title":"On the Positive Definiteness of the Poincaré–Steklov Operator for Elastic Half-Plane","authors":"A. A. Bobylev","doi":"10.3103/S0027133021060029","DOIUrl":"10.3103/S0027133021060029","url":null,"abstract":"<p>The Poincaré–Steklov operator that maps normal stresses to\u0000normal displacements on a part of a half-plane boundary is\u0000studied. A boundary value problem is formulated to introduce the\u0000associated Poincaré–Steklov operator. An integral\u0000representation based on the solution to the Flamant problem for\u0000an elastic half-plane subjected to a concentrated normal force is\u0000given for the operator under consideration. It is found that the\u0000properties of the Poincaré–Steklov operator depend on the\u0000choice of kinematic conditions specifying the rigid-body\u0000displacements of the half-plane. Positive definiteness conditions\u0000of the Poincaré–Steklov operator are obtained. It is shown that\u0000a suitable scaling of the computational domain can be used to\u0000provide the positive definiteness of this operator.</p>","PeriodicalId":710,"journal":{"name":"Moscow University Mechanics Bulletin","volume":"76 6","pages":"156 - 162"},"PeriodicalIF":0.3,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4173712","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 Mathieu Equation near the Boundaries of the Second and Third Resonance Zones 第二和第三共振区边界附近的Mathieu方程
IF 0.3
Moscow University Mechanics Bulletin Pub Date : 2022-03-04 DOI: 10.3103/S0027133021060030
V. M. Budanov, L. F. Davudova
{"title":"The Mathieu Equation near the Boundaries of the Second and Third Resonance Zones","authors":"V. M. Budanov,&nbsp;L. F. Davudova","doi":"10.3103/S0027133021060030","DOIUrl":"10.3103/S0027133021060030","url":null,"abstract":"<p>A second-order differential equation with periodic coefficients is considered. The reduction of this equation to a first-order nonlinear equation is shown. The fourth approximation of the second resonance zone and the third approximation of the third resonance zone are constructed for the Mathieu equation describing the behavior of solutions near the boundaries of these zones.</p>","PeriodicalId":710,"journal":{"name":"Moscow University Mechanics Bulletin","volume":"76 6","pages":"147 - 155"},"PeriodicalIF":0.3,"publicationDate":"2022-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4176066","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
Initial Alignment Method for a Strapdown Inertial Navigation System on a Swing Base 摆基捷联惯导系统的初始对准方法
IF 0.3
Moscow University Mechanics Bulletin Pub Date : 2022-02-11 DOI: 10.3103/S0027133021050022
G. O. Barantsev, A. A. Golovan, P. Yu. Kuznetsov
{"title":"Initial Alignment Method for a Strapdown Inertial Navigation System on a Swing Base","authors":"G. O. Barantsev,&nbsp;A. A. Golovan,&nbsp;P. Yu. Kuznetsov","doi":"10.3103/S0027133021050022","DOIUrl":"10.3103/S0027133021050022","url":null,"abstract":"<p>The article is devoted to deriving reference models for the problem of initial alignment of a strapdown inertial navigation system (INS) on a swing base. It is assumed that the system does not move relative to the Earth, but its body can make uncontrolled angular motions. The described models are based on the approximation of the readings of INS accelerometers from projections on the axes of the instrument reference frame ‘‘frozen’’ in the inertial space, and the orientation of the frame is determined by its position at the start of the alignment.</p>","PeriodicalId":710,"journal":{"name":"Moscow University Mechanics Bulletin","volume":"76 5","pages":"136 - 141"},"PeriodicalIF":0.3,"publicationDate":"2022-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4454907","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
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