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Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy最新文献

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Un modèle de prédiction de l'érosion des matériaux ductiles par la cavitation 预测空化侵蚀延性材料的模型
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-04-01 DOI: 10.1016/S1287-4620(00)00134-4
Nabila Berchiche, Jean-Pierre Franc, Jean-Marie Michel
{"title":"Un modèle de prédiction de l'érosion des matériaux ductiles par la cavitation","authors":"Nabila Berchiche,&nbsp;Jean-Pierre Franc,&nbsp;Jean-Marie Michel","doi":"10.1016/S1287-4620(00)00134-4","DOIUrl":"10.1016/S1287-4620(00)00134-4","url":null,"abstract":"<div><p>Cavitation erosion is a complex phenomenon involving the interaction of hydrodynamical, mechanical, metallurgical and chemical factors. A mathematical model is proposed to predict the erosion rate as a function of cavitation conditions and material properties.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 4","pages":"Pages 305-310"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00134-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82685014","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: 4
Exact stationary response of SDOF nonlinear stochastic oscillators SDOF非线性随机振荡器的精确平稳响应
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-04-01 DOI: 10.1016/S1287-4620(00)00132-0
Rubin Wang, Kimihiko Yasuda
{"title":"Exact stationary response of SDOF nonlinear stochastic oscillators","authors":"Rubin Wang,&nbsp;Kimihiko Yasuda","doi":"10.1016/S1287-4620(00)00132-0","DOIUrl":"10.1016/S1287-4620(00)00132-0","url":null,"abstract":"<div><p>In this paper, a systematic procedure is developed to obtain the stationary probability density function for the response of a general single-degree-of-freedom (SDOF) nonlinear oscillators under parametric and external Gaussian white-noise excitations. Wang and Zhang (1998) expressed the nonlinear function of oscillators by a polynomial formula. The nonlinear system described here has the following form: <span><math><mtext>x</mtext><mtext>̈</mtext><mtext>+g(x,</mtext><mtext>x</mtext><mtext>̇</mtext><mtext>)=k</mtext><msub><mi></mi><mn>1</mn></msub><mtext>ξ</mtext><msub><mi></mi><mn>1</mn></msub><mtext>(t)+k</mtext><msub><mi></mi><mn>2</mn></msub><mtext>xξ</mtext><msub><mi></mi><mn>2</mn></msub><mtext>(t)</mtext></math></span> , where <span><math><mtext>g(x,</mtext><mtext>x</mtext><mtext>̇</mtext><mtext>)=</mtext><mtext>∑</mtext><mtext>i=0</mtext><mtext>∞</mtext><mtext>g</mtext><msub><mi></mi><mn>i</mn></msub><mtext>(x)</mtext><mtext>x</mtext><mtext>̇</mtext><msup><mi></mi><mn>i</mn></msup></math></span> and <em>ξ</em><sub>1</sub>,<em>ξ</em><sub>2</sub> are Gaussian white noises. Thus, this paper is a generalization for the results obtained by Wang and Zhang (1998). The reduced Fokker–Planck (FP) equation is employed to get the governing equation of the probability density function. Based on this procedure, the exact stationary probability densities of many nonlinear stochastic oscillators are obtained, and it is shown that some of the exact stationary solutions described in the literature are only particular cases of the presented generalized results.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 4","pages":"Pages 349-357"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00132-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83300965","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: 2
Calcul du rayonnement acoustique d'une couche de mélange à l'aide des équations d'Euler linéarisées 用线性化欧拉方程计算混合层的声辐射
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-04-01 DOI: 10.1016/S1287-4620(00)00130-7
Christophe Bogey, Christophe Bailly, Daniel Juvé
{"title":"Calcul du rayonnement acoustique d'une couche de mélange à l'aide des équations d'Euler linéarisées","authors":"Christophe Bogey,&nbsp;Christophe Bailly,&nbsp;Daniel Juvé","doi":"10.1016/S1287-4620(00)00130-7","DOIUrl":"10.1016/S1287-4620(00)00130-7","url":null,"abstract":"<div><p>The noise radiated by a mixing layer is computed by an hybrid approach using linearized Euler's equations (LEE) as a wave operator. The acoustic source terms are obtained by substituting the aerodynamic fluctuating velocity field computed by the Large Eddy Simulation (LES) method into the right-hand side of the LEE. The radiated sound field as calculated in this way is in good agreement with the direct calculation obtained by LES. This study provides support to the validity of the acoustic analogy based on the LEE, both for the noise source terms and the mean flow effects on sound propagation.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 4","pages":"Pages 341-347"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00130-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72654679","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: 3
Étude expérimentale des auto-oscillations d'un jet plan confiné au sein d'une cavité contenant un obstacle 限制在有障碍物的腔内的平面射流自振荡的实验研究
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-04-01 DOI: 10.1016/S1287-4620(00)00139-3
Thierry Pacheu, Yves Le Guer, Lionel Lalanne, René Creff
{"title":"Étude expérimentale des auto-oscillations d'un jet plan confiné au sein d'une cavité contenant un obstacle","authors":"Thierry Pacheu,&nbsp;Yves Le Guer,&nbsp;Lionel Lalanne,&nbsp;René Creff","doi":"10.1016/S1287-4620(00)00139-3","DOIUrl":"10.1016/S1287-4620(00)00139-3","url":null,"abstract":"<div><p>We investigate the oscillation phenomena occurring when a two-dimensional plane jet emerges from a rectangular nozzle into a cavity with a body inside. It is shown that far from the lower oscillation limit, the frequencies of self-sustained oscillations are only governed by geometrical parameters. The evolutions of the Strouhal versus Reynolds number show that the effect of the geometry downstream the bluff-body is important for the control of the oscillation mechanism.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 4","pages":"Pages 297-303"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00139-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74835484","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: 2
Influence d'une erreur de prévision des fréquences propres sur les résultats d'un calcul de rayonnement acoustique par méthode éléments de frontière 固有频率预测误差对边界单元法声辐射计算结果的影响
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-04-01 DOI: 10.1016/S1287-4620(00)00137-X
Sylvie Le Moyne, Jean-Louis Tébec
{"title":"Influence d'une erreur de prévision des fréquences propres sur les résultats d'un calcul de rayonnement acoustique par méthode éléments de frontière","authors":"Sylvie Le Moyne,&nbsp;Jean-Louis Tébec","doi":"10.1016/S1287-4620(00)00137-X","DOIUrl":"10.1016/S1287-4620(00)00137-X","url":null,"abstract":"<div><p>One of the sources of inaccuracy of a structural acoustic radiation calculation with a boundary element method is the inaccuracy of the vibration data used as boundary limits. When vibration data come from a finite element method calculation, these inaccuracies can be made, in particular, on the structural eigenfrequencies prevision. In this note, we propose a first approach of the problem for this effect of eigenfrequencies inaccuracies on the acoustic field calculation.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 4","pages":"Pages 329-333"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00137-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79422706","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
Convection mixte d'un mélange binaire en milieu poreux 二元混合物在多孔介质中的混合对流
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-04-01 DOI: 10.1016/S1287-4620(00)00140-X
Annabelle Joulin, Mohamed Najib Ouarzazi
{"title":"Convection mixte d'un mélange binaire en milieu poreux","authors":"Annabelle Joulin,&nbsp;Mohamed Najib Ouarzazi","doi":"10.1016/S1287-4620(00)00140-X","DOIUrl":"10.1016/S1287-4620(00)00140-X","url":null,"abstract":"<div><p>We study the nature of the instability of a binary mixture in a porous medium heated from below in the presence of an horizontal flow. The asymptotic response of the system to a localized perturbation in the both directions of the horizontal plane is evaluated. At the threshold of absolute instability, the rotational symmetry is broken by the presence of the horizontal flow and among infinity of unstable spatio–temporal modes, the system selects the traveling waves which propagate in the flow direction. We also show that in binary mixtures, contrary to pure fluids, the flow may suppress the transition from convective to absolute instability.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 4","pages":"Pages 311-316"},"PeriodicalIF":0.0,"publicationDate":"2000-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00140-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"103432937","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: 5
Inclusion élastoplastique en surface 表面弹性体夹杂物
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-02-01 DOI: 10.1016/S1287-4620(00)00108-3
Maxime Sauzay , Pierre Gilormini
{"title":"Inclusion élastoplastique en surface","authors":"Maxime Sauzay ,&nbsp;Pierre Gilormini","doi":"10.1016/S1287-4620(00)00108-3","DOIUrl":"10.1016/S1287-4620(00)00108-3","url":null,"abstract":"<div><p>Using the finite element method, we study the cyclic single slip of well-oriented ferritic grains at the surface of a polycrystal. We explain some usual observations, such as an increased plastic strain and a reduced number of activated slip systems. But these computations, which do not consider a smoother hardening near the free surface, seem to underestimate the real surface effect.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 2","pages":"Pages 117-122"},"PeriodicalIF":0.0,"publicationDate":"2000-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00108-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90762569","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: 5
Acoustique d'un fluide au voisinage du point d'ébullition 流体在沸点附近的声学
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-02-01 DOI: 10.1016/S1287-4620(00)00103-4
Jean-Louis Auriault , Claude Boutin
{"title":"Acoustique d'un fluide au voisinage du point d'ébullition","authors":"Jean-Louis Auriault ,&nbsp;Claude Boutin","doi":"10.1016/S1287-4620(00)00103-4","DOIUrl":"10.1016/S1287-4620(00)00103-4","url":null,"abstract":"<div><p>In a previous paper (Boutin and Auriault 1993) the homogenization technique of multiscale expansions was used for investigating how acoustic waves may propagate in a bubbly fluid at finite concentration. Three different equivalent macroscopic behaviours where derived, for “large”, “medium” and “small” bubble systems, respectively. In the present paper, we extend the analysis by taking into consideration possible phase change effects. We show that phase change effects are negligible in the case of “large” bubbles, whereas they strongly modify the “medium” bubble system behaviour by decreasing the bulk modulus of several orders of magnitude. For “small” bubbles, capillary effects are dominating.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 2","pages":"Pages 171-177"},"PeriodicalIF":0.0,"publicationDate":"2000-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00103-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83853827","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
Représentation du tenseur de corrélation spatiale de vitesse en écoulements turbulents libres 自由湍流中速度空间相关张量的表示
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-02-01 DOI: 10.1016/S1287-4620(00)00107-1
Philippe Druault, Joël Delville
{"title":"Représentation du tenseur de corrélation spatiale de vitesse en écoulements turbulents libres","authors":"Philippe Druault,&nbsp;Joël Delville","doi":"10.1016/S1287-4620(00)00107-1","DOIUrl":"10.1016/S1287-4620(00)00107-1","url":null,"abstract":"<div><p>From experimental data obtained at a limited number of reference locations, a new method permitting to estimate the two-point spatial correlation tensor of the velocity on any mesh is presented. Firstly, a Gram-Charlier expansion is used to interpolate this tensor between reference points. Secondly, by using Proper Orthogonal Decomposition properties, this tensor is extrapolated on a larger mesh than the experimental one. An application of this procedure based on experimental turbulent plane mixing layer data is then shown.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 2","pages":"Pages 135-141"},"PeriodicalIF":0.0,"publicationDate":"2000-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00107-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84995919","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: 3
Équilibrage dynamique des mécanismes spatiaux 空间机制的动态平衡
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy Pub Date : 2000-02-01 DOI: 10.1016/S1287-4620(00)00112-5
Viguen Arakelian, Marc Dahan
{"title":"Équilibrage dynamique des mécanismes spatiaux","authors":"Viguen Arakelian,&nbsp;Marc Dahan","doi":"10.1016/S1287-4620(00)00112-5","DOIUrl":"10.1016/S1287-4620(00)00112-5","url":null,"abstract":"<div><p>This paper deals with a new solution suggested for dynamic balancing (shaking force and shaking moment balancing) of spatial mechanisms. The conditions for balancing are formulated by the minimization of the root-mean-square value of the shaking moment. There are considered two cases: mechanism with the input link by constant angular velocity and mechanism with the input link by variable angular velocity. The method is realized by displacement of the axis of rotation of the input link connected with the counterweight. The efficiency of the suggested method is illustrated by numerical example.</p></div>","PeriodicalId":100303,"journal":{"name":"Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy","volume":"328 2","pages":"Pages 109-115"},"PeriodicalIF":0.0,"publicationDate":"2000-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1287-4620(00)00112-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78199472","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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