Pub Date : 2018-10-05DOI: 10.4081/incontri.2018.394
Alberto Corigliano
The next International Congress of Theoretical and Applied Mechanics ICTAM is announced, which will take place in Milan in 2020.
下一届国际理论与应用力学大会(ICTAM)将于2020年在米兰举行。
{"title":"INTERVENTI","authors":"Alberto Corigliano","doi":"10.4081/incontri.2018.394","DOIUrl":"https://doi.org/10.4081/incontri.2018.394","url":null,"abstract":"The next International Congress of Theoretical and Applied Mechanics ICTAM is announced, which will take place in Milan in 2020.","PeriodicalId":119535,"journal":{"name":"Istituto Lombardo - Accademia di Scienze e Lettere - Incontri di Studio","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130384501","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 : 2018-10-05DOI: 10.4081/incontri.2018.391
S. Lenci, Diletta Maracci
This work is aimed at reporting a personal, and thus partial, history of the dynamics and stability concepts within the framework of classical mechanics. The idea is to introduce these concepts without using mathematics and formula, but rather through practical and clear examples. For this purpose, it has been chosen to take in consideration some simple dynamic phenomena that we are used to live with, but that are able to explain more complex concepts. The paper starts with a brief summary on equilibrium concept evolution, passes through stability problems and arrives to more advanced concepts, such as structural stability and dynamical integrity.
{"title":"DYNAMICS AND STABILITY: A LONG HISTORY FROM EQUILIBRIUM TO DYNAMICAL INTEGRITY","authors":"S. Lenci, Diletta Maracci","doi":"10.4081/incontri.2018.391","DOIUrl":"https://doi.org/10.4081/incontri.2018.391","url":null,"abstract":"This work is aimed at reporting a personal, and thus partial, history of the dynamics and stability concepts within the framework of classical mechanics. The idea is to introduce these concepts without using mathematics and formula, but rather through practical and clear examples. For this purpose, it has been chosen to take in consideration some simple dynamic phenomena that we are used to live with, but that are able to explain more complex concepts. The paper starts with a brief summary on equilibrium concept evolution, passes through stability problems and arrives to more advanced concepts, such as structural stability and dynamical integrity.","PeriodicalId":119535,"journal":{"name":"Istituto Lombardo - Accademia di Scienze e Lettere - Incontri di Studio","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128599243","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 : 2018-10-05DOI: 10.4081/incontri.2018.388
F. Caselli, N. Nodargi, P. Bisegna
Cell mechanics is a discipline that bridges cell biology with mechanics. Emerging microscale technologies are opening new venues in the field, due to their costeffectiveness, relatively easy fabrication, and high throughput. Two examples of those technologies are discussed here: microfluidic impedance cytometry and erythrocyte electrodeformation. The former is a lab-on-chip technology offering a simple, non-invasive, label-free method for counting, identifying and monitoring cellular biophysical and mechanical function at the single-cell level. The latter is a useful complement to the former, enabling cell deformation under the influence of an applied electric field.
{"title":"MICRO-SCALE TECHNOLOGIES FOR CELL MECHANICS: EXPERIMENTAL AND MODELLING APPROACHES","authors":"F. Caselli, N. Nodargi, P. Bisegna","doi":"10.4081/incontri.2018.388","DOIUrl":"https://doi.org/10.4081/incontri.2018.388","url":null,"abstract":"Cell mechanics is a discipline that bridges cell biology with mechanics. Emerging microscale technologies are opening new venues in the field, due to their costeffectiveness, relatively easy fabrication, and high throughput. Two examples of those technologies are discussed here: microfluidic impedance cytometry and erythrocyte electrodeformation. The former is a lab-on-chip technology offering a simple, non-invasive, label-free method for counting, identifying and monitoring cellular biophysical and mechanical function at the single-cell level. The latter is a useful complement to the former, enabling cell deformation under the influence of an applied electric field.","PeriodicalId":119535,"journal":{"name":"Istituto Lombardo - Accademia di Scienze e Lettere - Incontri di Studio","volume":"268 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123114052","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 : 2018-10-05DOI: 10.4081/INCONTRI.2018.387
Davide Bigoni
The leitmotiv of the described research activity is the situation in which an elastic solid or an elastic structure can spontaneously generate complex geometrical patterns, when subjected to extreme deformation. In this context, folding and faulting are described for a three-dimensional elastic solid with extreme anisotropy. The dripping of an elastic rod is presented (as generated by configurational forces) and finally the possibility of a self-oscillating elastic system is introduced, where an elastic structure oscillates with a given frequency when subject to a steady energy input.
{"title":"GEOMETRIA ED ELASTICITÀ: FOLDING DI UN SOLIDO, DRIPPING DI UN’ASTA ELASTICA E STRUTTURE SELF-OSCILLATING","authors":"Davide Bigoni","doi":"10.4081/INCONTRI.2018.387","DOIUrl":"https://doi.org/10.4081/INCONTRI.2018.387","url":null,"abstract":"The leitmotiv of the described research activity is the situation in which an elastic solid or an elastic structure can spontaneously generate complex geometrical patterns, when subjected to extreme deformation. In this context, folding and faulting are described for a three-dimensional elastic solid with extreme anisotropy. The dripping of an elastic rod is presented (as generated by configurational forces) and finally the possibility of a self-oscillating elastic system is introduced, where an elastic structure oscillates with a given frequency when subject to a steady energy input.","PeriodicalId":119535,"journal":{"name":"Istituto Lombardo - Accademia di Scienze e Lettere - Incontri di Studio","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115833092","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 : 2018-10-05DOI: 10.4081/INCONTRI.2018.383
Paolo Luchini
Not available.
不可用。
{"title":"SALUTO DEL PRESIDENTE DELL’ASSOCIAZIONE ITALIANA DI MECCANICA TEORICA E APPLICATA (AIMETA)","authors":"Paolo Luchini","doi":"10.4081/INCONTRI.2018.383","DOIUrl":"https://doi.org/10.4081/INCONTRI.2018.383","url":null,"abstract":"Not available.","PeriodicalId":119535,"journal":{"name":"Istituto Lombardo - Accademia di Scienze e Lettere - Incontri di Studio","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127612412","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 : 2018-10-05DOI: 10.4081/INCONTRI.2018.386
P. Luchini
A research line is reviewed which, over a few years, led to a substantial change of perspective about the simplified models that underlie the description of quasi-onedimensional streams, their instabilities, and their effects upon sandy beds. Even when the flow is assumed to be laminar, the Saint-Venant equation of quasi-onedimensional fluid flow can be formulated in more than one manner; it will be shown that only one of these choices is consistent with the complete three-dimensional Navier- Stokes equations. When the flow is turbulent, an added complication is the presence of a turbulence model, most often of the eddy-viscosity type; it will be shown that such a model can be in strong contrast with a direct numerical simulation of the same phenomenon, even to the point of producing results of opposite sign. In addition, the complete numerical simulation of flow past an undulated bottom exhibits a non-monotonic approach to its long-wave, quasi-onedimensional limit, with a surprising resonance that has no laminar counterpart and must become the subject of future investigations.
{"title":"SURPRISING BEHAVIOUR AND SINGULARITY IN THE SAINT VENANT APPROXIMATION FOR A FLUID","authors":"P. Luchini","doi":"10.4081/INCONTRI.2018.386","DOIUrl":"https://doi.org/10.4081/INCONTRI.2018.386","url":null,"abstract":"A research line is reviewed which, over a few years, led to a substantial change of perspective about the simplified models that underlie the description of quasi-onedimensional streams, their instabilities, and their effects upon sandy beds. Even when the flow is assumed to be laminar, the Saint-Venant equation of quasi-onedimensional fluid flow can be formulated in more than one manner; it will be shown that only one of these choices is consistent with the complete three-dimensional Navier- Stokes equations. When the flow is turbulent, an added complication is the presence of a turbulence model, most often of the eddy-viscosity type; it will be shown that such a model can be in strong contrast with a direct numerical simulation of the same phenomenon, even to the point of producing results of opposite sign. In addition, the complete numerical simulation of flow past an undulated bottom exhibits a non-monotonic approach to its long-wave, quasi-onedimensional limit, with a surprising resonance that has no laminar counterpart and must become the subject of future investigations.","PeriodicalId":119535,"journal":{"name":"Istituto Lombardo - Accademia di Scienze e Lettere - Incontri di Studio","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126075188","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 : 2018-10-05DOI: 10.4081/INCONTRI.2018.392
Antonio Giorgilli
The hystorical development of the problem of stability of the Solar System is revisited, starting fromthe work of Kepler. The following topics are included: (i) the discovery of the so called ‘‘great inequality’’ of Jupiter and Saturn by Kepler himself; (ii) the dawn of perturbation theory in the work of Lagrange and Laplace and the problem of resonances; (iii) the discovery of chaotic motions in the work of Poincar´e; (iv) the theorem of Kolmogorov on persistence of quasi periodic motions and the theory of Nekhoroshev on stability over exponentially long times. Finally, an account is given concerning some recent work on the actual applicability of the theorems of Kolmogorov and Nekhoroshev to realistic models of the Solar System, thus pointing out their relevance in discussing the problem of stability.
{"title":"IL FLEBILE SUSSURRO DEL CAOS NELL’ARMONIA DEI PIANETI","authors":"Antonio Giorgilli","doi":"10.4081/INCONTRI.2018.392","DOIUrl":"https://doi.org/10.4081/INCONTRI.2018.392","url":null,"abstract":"The hystorical development of the problem of stability of the Solar System is revisited, starting fromthe work of Kepler. The following topics are included: (i) the discovery of the so called ‘‘great inequality’’ of Jupiter and Saturn by Kepler himself; (ii) the dawn of perturbation theory in the work of Lagrange and Laplace and the problem of resonances; (iii) the discovery of chaotic motions in the work of Poincar´e; (iv) the theorem of Kolmogorov on persistence of quasi periodic motions and the theory of Nekhoroshev on stability over exponentially long times. Finally, an account is given concerning some recent work on the actual applicability of the theorems of Kolmogorov and Nekhoroshev to realistic models of the Solar System, thus pointing out their relevance in discussing the problem of stability.","PeriodicalId":119535,"journal":{"name":"Istituto Lombardo - Accademia di Scienze e Lettere - Incontri di Studio","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121343094","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 : 2018-10-05DOI: 10.4081/incontri.2018.393
J. Salençon
As a Foreign Associate Member I wish to thank and congratulate the Istituto Lombardo for having organised this one-full-day meeting on the occasion of the 50th anniversary of the Italian Association for Theoretical and Applied mechanics, AIMETA. It has been a wonderful opportunity to appreciate the versatility of mechanical rationales ranging from biological cells to the solar system. Within 4 years, Milan will host ICTAM 2020, the International Conference on Theoretical and Applied Mechanics. On this occasion researchers from all over the world will meet in a place famous for its long lasting tradition of excellence in Mechanics and no doubt make this gathering a success.
{"title":"INTERVENTI","authors":"J. Salençon","doi":"10.4081/incontri.2018.393","DOIUrl":"https://doi.org/10.4081/incontri.2018.393","url":null,"abstract":"As a Foreign Associate Member I wish to thank and congratulate the Istituto Lombardo for having organised this one-full-day meeting on the occasion of the 50th anniversary of the Italian Association for Theoretical and Applied mechanics, AIMETA. It has been a wonderful opportunity to appreciate the versatility of mechanical rationales ranging from biological cells to the solar system. Within 4 years, Milan will host ICTAM 2020, the International Conference on Theoretical and Applied Mechanics. On this occasion researchers from all over the world will meet in a place famous for its long lasting tradition of excellence in Mechanics and no doubt make this gathering a success.","PeriodicalId":119535,"journal":{"name":"Istituto Lombardo - Accademia di Scienze e Lettere - Incontri di Studio","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116599267","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 : 2018-10-05DOI: 10.4081/incontri.2018.390
Massimo Sorli
The present report highlights the current and future role of techniques and methodologies of the Mechanics of Machines, both in the design of devices and systems, and in the university training courses. The underlying theme of the presentation lays in the interpretation of the physical phenomenon which oversees the operation of the machines. This is the foundation allowing to define an input-output interaction between the physical quantities operating on the machine. The cause-effect relation offers the possibility to determine a set of analytical relations for the prediction of the operation of the machine and to simulate theoretical and / or numerical trends in time or frequency domain of the significant mechanical quantities. It is evident the magnitude of the physical phenomena that arise in the operation of a machine, resulting in a broad variety of related Mechanics of Machines topics: from the contact between bodies analysis to tribological aspects, from body geometry to kinematics, from the rigid to deformable body dynamics, from the interaction between mechanical bodies to manmachine interaction, from the kinematic and dynamic behavior of a mechanical system to its interface with the actuators, sensing and control, just to name some of them. It should also be considered that the interpretation of the physical phenomenon of organs of machines has to be supported by significant experimental campaigns, specifically reproduced in laboratory, or related to data from real applications in the different application domains. The evolution of Mechanics of Machines proved in the years to be able to respond to these two interacting and converging questions: on the one hand the need to identify analytical relations, possibly not based on sole mappings of data, but rather on representative analytical relations of physical quantities, and on the other hand, the need, even at the university level, to conduct appropriate laboratory test campaigns related to the real field operation of the machine. With reference to the first objective, the need to determine algorithms, typically non-linear, and the consequent simulations setups, has resulted in the passage of the Machine Mechanics from a theoretical subject, to a subject with strong computational valences creating tools for the prediction of the behavior of devices and systems, in relation to their diagnosis and health state. The second objective has required the achievement of competence also in the field of the test rigs, of sensing and measuring / data acquisition systems. The paper deals with the identification and the presentation of the different areas related to Machine Mechanics, exposing in a matrix the enabling technologies on the one hand and the application domains to which they apply in the other hand. The enabling technologies traditionally belong to the topics of kinematics, statics, dynamics (linear and nonlinear), to the interactions with the environment (force fields, interactions with
{"title":"LA MECCANICA DELLE MACCHINE NELL’INNOVAZIONE DEI PRODOTTI E DEI PROCESSI","authors":"Massimo Sorli","doi":"10.4081/incontri.2018.390","DOIUrl":"https://doi.org/10.4081/incontri.2018.390","url":null,"abstract":"The present report highlights the current and future role of techniques and methodologies of the Mechanics of Machines, both in the design of devices and systems, and in the university training courses. The underlying theme of the presentation lays in the interpretation of the physical phenomenon which oversees the operation of the machines. This is the foundation allowing to define an input-output interaction between the physical quantities operating on the machine. The cause-effect relation offers the possibility to determine a set of analytical relations for the prediction of the operation of the machine and to simulate theoretical and / or numerical trends in time or frequency domain of the significant mechanical quantities. It is evident the magnitude of the physical phenomena that arise in the operation of a machine, resulting in a broad variety of related Mechanics of Machines topics: from the contact between bodies analysis to tribological aspects, from body geometry to kinematics, from the rigid to deformable body dynamics, from the interaction between mechanical bodies to manmachine interaction, from the kinematic and dynamic behavior of a mechanical system to its interface with the actuators, sensing and control, just to name some of them. It should also be considered that the interpretation of the physical phenomenon of organs of machines has to be supported by significant experimental campaigns, specifically reproduced in laboratory, or related to data from real applications in the different application domains. The evolution of Mechanics of Machines proved in the years to be able to respond to these two interacting and converging questions: on the one hand the need to identify analytical relations, possibly not based on sole mappings of data, but rather on representative analytical relations of physical quantities, and on the other hand, the need, even at the university level, to conduct appropriate laboratory test campaigns related to the real field operation of the machine. With reference to the first objective, the need to determine algorithms, typically non-linear, and the consequent simulations setups, has resulted in the passage of the Machine Mechanics from a theoretical subject, to a subject with strong computational valences creating tools for the prediction of the behavior of devices and systems, in relation to their diagnosis and health state. The second objective has required the achievement of competence also in the field of the test rigs, of sensing and measuring / data acquisition systems. The paper deals with the identification and the presentation of the different areas related to Machine Mechanics, exposing in a matrix the enabling technologies on the one hand and the application domains to which they apply in the other hand. The enabling technologies traditionally belong to the topics of kinematics, statics, dynamics (linear and nonlinear), to the interactions with the environment (force fields, interactions with ","PeriodicalId":119535,"journal":{"name":"Istituto Lombardo - Accademia di Scienze e Lettere - Incontri di Studio","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133194473","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}
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