Relevant bibliographies by topics / Coupe – Vibrations

Academic literature on the topic 'Coupe – Vibrations'

Author: Grafiati
Published: 8 June 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Coupe – Vibrations.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Journal articles on the topic "Coupe – Vibrations":

1

Kribes, N., N. Ouelaa, M. A. Yallese, and S. Belhadi. "Analyse de l'impact des paramètres de coupe et des vibrations sur la rugosité des pièces usinées en tournage à partir de la méthode de régression linéaire multiple." Matériaux & Techniques 95, no. 3 (2007): 197–203. http://dx.doi.org/10.1051/mattech:2008004.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Mortimer, B. "A Spider’s Vibration Landscape: Adaptations to Promote Vibrational Information Transfer in Orb Webs." Integrative and Comparative Biology 59, no. 6 (May 20, 2019): 1636–45. http://dx.doi.org/10.1093/icb/icz043.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract Spider orb webs are used not only for catching prey, but also for transmitting vibrational information to the spider. Vibrational information propagates from biological sources, such as potential prey or mates, but also abiotic sources, such as wind. Like other animals, the spider must cope with physical constraints acting on the propagation of vibrational information along surfaces and through materials—including loss of energy, distortion, and filtering. The spider mitigates these physical constraints by making its orb web from up to five different types of silks, closely controlling silk use and properties during web building. In particular, control of web geometry, silk tension, and silk stiffness allows spiders to adjust how vibrations spread throughout the web, as well as their amplitude and speed of propagation, which directly influences energy loss, distortion, and filtering. Turning to how spiders use this information, spiders use lyriform organs distributed across their eight legs as vibration sensors. Spiders can adjust coupling to the silk fibers and use posture to modify vibrational information as it moves from the web to the sensors. Spiders do not sense all vibrations equally—they are least sensitive to low frequencies (<30 Hz) and most sensitive to high frequencies (ca. 1 kHz). This sensitivity pattern cannot be explained purely by the frequency range of biological inputs. The role of physical and evolutionary constraints is discussed to explain spider vibration sensitivity and a role of vibration sensors to detect objects on the web as a form of echolocation is also discussed.
3

Shaikh, Zubair, Sudarshan Gajre, Kishor Deshmukh, and Jotiprasad Shete. "Developing a Robust Process for Design Margin Calculation Through Modal Scaling and Harmonic Analysis of Engine Mounted After Treatment System." Indian Journal of Signal Processing 4, no. 1 (February 28, 2024): 1–6. http://dx.doi.org/10.54105/ijsp.c4352.04010224.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
The last few years have seen an increase in the complexity of emission standards. This has caused OEMs to start using Exhaust Gas Processors (EGP) or Exhaust After Treatment Systems (EATS)in complex integration. These systems are usually mounted on vehicle chassis or engine body with the help of mounting straps or brackets. The arrangement of the system leads to road loads and/or engine vibrations being transferred and causing damage to its components. New BS VI engines need some AT (After treatment) components to be mounted directly on the engine and others to chassis. The components that are directly mounted on engine are called close couple AT system which are subjected to engine harmonic vibrations which falls under forced vibration criteria. Most of the AT system are subjected to random vibrations and industry has a well-defined procedure to address the problem, but for harmonic vibrations there is no specific approach. In order to optimize the structural durability of close couple AT system against HCF (high cycle fatigue) fatigue harmonic vibration, there is a need for well-defined test analysis correlation procedure. The objective of this work is defining and documenting a robust process for design margin through calculation modal scaling and harmonic analysis of close couple AT system through test analysis correlation activity. Analytical, numerical and testing data were compared and conclusions are drawn. More case studies can be added to this work in order to validate the test analysis correlation activity and boost the degree of confidence. Future study may include recording additional failure modes in addition to the harmonic HCF failure mode.
4

Romdhon, Abdul ghofar, Mohammad Ilham, Rini puji Astutik, and Denny Irawan. "Penanganan Lonjakan Vibrasi pada Rotor Elektrik Turbin di PLTU Gresik." Journal of Applied Smart Electrical Network and Systems 1, no. 02 (December 31, 2020): 47–54. http://dx.doi.org/10.52158/jasens.v1i02.116.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
This analysis will discuss how to handle vibrations in the Turbine Rotor. The measuring instrument used is Vibration Analysis test with Prov. 2140 type which measured amplitude, time and frequency domain of vibration signal. The results obtained in this study, firstly, the measurement vibration of rotor at PT PJB Gresik found the highest amplitude of vibration was 59,6 μm at 3000 rpm. In this condition, the rotor is in very good condition as per standard vibration in ISO 7919-2 stated 80 μm at 3000 rpm. However in the next measurement, there is an dramatically increase of amplitude in each vibration measurement. The top amplitude of vibration reached at 115 μm at 3000 rpm and shown a symtom of damage on the rotor as a result of vibration. In solving the problem this time we use the method Root couse analysis (RCA). The results of this research found that there was a short turn to turn on the rotor windings and the closed slot liner holes that caused electric vibrations and needed to be repaired to eliminate vibration disturbances. After repairing the vibration, it decreased which initially 115 μm to 33.5 μm at 3000 Rpm, it is still on the range of the permitted safe zone of ISO standard 7919−2.
5

Ren, Fushen, Baojin Wang, and Suli Chen. "Nonlinear Modeling and Qualitative Analysis of Coupled Vibrations in a Drill String." International Journal of Bifurcation and Chaos 28, no. 10 (September 2018): 1850119. http://dx.doi.org/10.1142/s0218127418501195.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
A coupled model for axial/torsional/lateral vibrations of the drill string is presented, in which the nonlinear dynamics and qualitative analysis method are employed to find out the key factors and sensitive zone for coupled vibration. The drill string is simplified as an equivalent shell under axial rotation. After dimensionless processing, the mathematical model for coupled axial/torsional/lateral vibrations of the drill string is obtained. The Runge–Kutta–Fehlberg method is employed for the numerical simulation, and the rules that govern the changing of the torsional and axial excitation are revealed. And the stability domains of the explicit Runge–Kutta method are analyzed. Furthermore, the suggestions for field applications are also presented. It is demonstrated by simulation results that the lateral/axial/torsional vibrations exist simultaneously and couple with each other. The system will obtain a stable period motion with an axial excitation zone before the coupled vibration in the three directions, and continue to increase the axial excitation to cause the coupled vibration easily. The torsional excitation of the drill string mainly contributes to the coupled vibration in the three directions when in a specific rotation speed zone. The system is more likely to obtain a periodic motion through adjusting the torsional excitation out of this zone.
6

Mazur, Krzysztof, and Marek Pawełczyk. "Active Noise Control with a Single Nonlinear Control Filter for a Vibrating Plate with Multiple Actuators." Archives of Acoustics 38, no. 4 (December 1, 2013): 537–45. http://dx.doi.org/10.2478/aoa-2013-0063.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract Vibrating plates can be used in Active Noise Control (ANC) applications as active barriers or as secondary sources replacing classical loudspeakers. The system with vibrating plates, especially when nonlinear MFC actuators are used, is nonlinear. The nonlinearity in the system reduces performance of classical feedforward ANC with linear control filters systems, because they cannot cope with harmonics generated by the nonlinearity. The performance of the ANC system can be improved by using nonlinear control filters, such as Artificial Neural Networks or Volterra filters. However, when multiple actuators are mounted on a single plate, which is a common practice to provide effective control of more vibration modes, each actuator should be driven by a dedicated nonlinear control filter. This significantly increases computational complexity of the control algorithm, because adaptation of nonlinear control filters is much more computationally demanding than adaptation of linear FIR filters. This paper presents an ANC system with multiple actuators, which are driven with a single nonlinear filter. To avoid destructive interference of vibrations generated by different actuators the control signal is filtered by appropriate separate linear filters. The control system is experimentally verified and obtained results are reported.
7

Aghazadeh, Reza. "Free Vibration Analysis of Shear Deformable Small-Scale Tubes." Academic Perspective Procedia 3, no. 1 (October 25, 2020): 418–27. http://dx.doi.org/10.33793/acperpro.03.01.86.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
This study presents an approach for investigating free vibration problem of small-scale tubes based on modified couple stress theory in conjunction with higher order shear deformation tube model. The size effect is captured through utilization of a length scale parameter involved in modified couple stress theory. A newly developed refined tube model is employed to satisfy friction-free conditions on inner and outer surfaces of micro-tubes. Hamilton’s principle is used as a variational technique for derivation of governing system of equations. For axial vibrations, an analytical procedure is conducted, while for transverse vibrations differential quadrature method is used as a numerical technique. The correctness of numerical results are verified through comparisons made with results which are available in the literature for limiting cases. The analyses reveal the effects of size and transverse shear deformation on the natural frequencies of micro-tubes.
8

Ansari, R., M. A. Ashrafi, T. Pourashraf, and M. Hemmatnezhad. "Vibration Analysis of a Postbuckled Microscale FG Beam Based on Modified Couple Stress Theory." Shock and Vibration 2014 (2014): 1–20. http://dx.doi.org/10.1155/2014/654640.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
On the basis of modified couple stress theory, the postbuckling behavior of the Euler-Bernoulli microscale FG beams is investigated by means of an exact solution method. The modified couple stress theory as a nonclassical continuum theory is capable of interpreting the size dependencies which become more significant at micro/nanoscales. The Von-Karman type nonlinear strain-displacement relationships are employed. The thermal effects are also incorporated into formulation. The governing equation of motion and the corresponding boundary conditions are derived using Hamilton’s principle. The material properties are assumed to be graded in the thickness direction according to the power-law distribution. A closed-form solution is obtained for the postbuckling deformation which is beyond the critical buckling load. To study the vibrations taking place in the vicinity of a buckled equilibrium position, the linear vibration problem is exactly solved around the first three buckled configurations. The natural frequencies of the lowest vibration modes around each of the first three buckled configurations are obtained. The influences of power-law exponent, boundary condition, length scale parameter, and thermal environment changes on the static deflection and free vibration frequencies are studied. A comparison is also made between the present results and those obtained via the classical beam theories.
9

Jin, Hao, Weining Liu, and Shunhua Zhou. "Optimization of Vibration Reduction Ability of Ladder Tracks by FEM Coupled with ACO." Shock and Vibration 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/484827.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Ladder track, which has drawn increased attention in scientific communities, is an effective method for reducing vibrations from underground railways. In order to optimize the vibration reduction ability of ladder track, a new method, that is, the finite element method (FEM) coupled with ant colony optimization (ACO), has been proposed in this paper. We describe how to build the FEM model verified by the vibration tests in the Track Vibration Abatement and Control Laboratory and how to couple the FEM with ACO. The density and elasticity modulus of the sleeper pad are optimized using this method. After optimization, the vibration acceleration level of the supporting platform in the 1–200 Hz range was reduced from 102.8 dB to 94.4 dB. The optimized density of the sleeper pad is 620 kg/m3, and the optimized elasticity modulus of the sleeper pad is 6.25 × 106 N/m2.
10

Brennan, M. J., M. J. Day, and R. J. Randall. "An Experimental Investigation into the Semi-Active and Active Control of Longitudinal Vibrations in a Large Tie-Rod Structure." Journal of Vibration and Acoustics 120, no. 1 (January 1, 1998): 1–12. http://dx.doi.org/10.1115/1.2893806.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
An experimental study into the use of one semi-active and two active control devices employed to attenuate the transmission of longitudinal vibrations on a large tie-rod structure is described. A tie-rod structure similar to that found in marine machinery installations was assembled in the laboratory. This type of structure was chosen because it is difficilt to apply standard passive techniques due to the static stiffness requirement. A tunable pneumatic vibration absorber was used as the semi-active device, and an inertial electrodynamic exciter and a magnetostrictive actuator were used as the active devices. The way in which these devices couple into and modify the dynamic behaviour of the tie-rod structure is discussed, and experimental results are presented showing the effectiveness of the control measures in attenuating longitudinal vibrations. Significant reductions in transmitted vibrations were achieved by all the devices and the merits of each method are discussed.
More sources
You might also be interested in the extended bibliographies on the topic 'Coupe – Vibrations' for particular source types:
Journal articles Dissertations / Theses

Dissertations / Theses on the topic "Coupe – Vibrations":

1

Segreti, Michel Dudzinski Daniel. "Vibrations en coupe orthogonale Modélisation, étude de stabilité et validation expérimentale /." Metz : Université Metz, 2008. ftp://ftp.scd.univ-metz.fr/pub/Theses/2002/Segreti.Michel.SMZ0201.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Segreti, Michel. "Vibrations en coupe orthogonale : Modélisation, étude de stabilité et validation expérimentale." Metz, 2002. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/2002/Segreti.Michel.SMZ0201.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Cette thèse porte sur la modélisation des vibrations de l'outil en coupe orthogonale, l'étude de stabilité du processus et la validation expérimentale. Dans ce travail, un modèle à un seul, puis à deux degrés de liberté du processus vibratoire a été développé. Pour des conditions de coupe données, il est possible d'estimer les efforts de coupe instantanés, d'obtenir la réponse dynamique de l'outil et donc l'état de surface final, et de prévoir la limite de stabilité du processus caractérisée par des lobes. Différents effets couplés ont été pris en compte tels que : le frottement à l'interface outil-copeau fonction de la vitesse du copeau, les variations de la quantité de matière usinée dues aux ondulations de la surface à usiner associées aux oscillations de l'outil, les variations instantanées de l'angle de coupe et de dépouille, l'effet de la pente de la surface à usinersur l'angle de cisaillement et le contact en dépouille de l'outil avec la surface nouvellement usinée.
3

Bisu, Claudiu-Florinel. "Etude des vibrations auto-entretenues en coupe tridimensionnelle : nouvelle modélisation appliquée au tournage." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2007. http://tel.archives-ouvertes.fr/tel-00274647.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Dans la mise en forme par enlèvement de matière, pour certaines morphologies de pièces et sous certaines conditions de coupe, l'apparition de vibrations auto-entretenues est inévitable.
Pour remédier à ce phénomène en tournage des matériaux, une étude expérimentale originale exploitant la notion de torseur d'efforts est mise en place pour déterminer, très précisément, le comportement dynamique du système usinant (pièce/outil/machine). Les principaux paramètres relatifs au comportement dynamique du système usinant sont identifiés. La localisation des déplacements de la pointe de l'outil dans un plan caractéristique est démontrée. L'existence de ce plan et les corrélations avec les caractéristiques élastiques du système usinant permettent de simplifier le modèle dynamique 3D et de proposer un modèle en accord avec les résultats expérimentaux tout en restant dans une configuration tridimensionnelle de la coupe.
La simulation numérique issue de ce modèle simplifié fournit des résultats en bon accord avec l'expérience.
4

Bisu, Claudiu Florinel. "Etude des vibrations auto-entretenues en coupe tridimensionnelle : nouvelle modélisation appliquée au tournage." Bordeaux 1, 2007. http://www.theses.fr/2007BOR13375.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Dans la mise en forme par enlèvement de matière, pour certaines morphologies de pièces et sous certaines conditions de coupe, l'apparition de vibration auto-entretenues est inévitalbles. Pour remédier à ce phénomène en tournage des matériaux, une étude expérimentale originale exploitant la notion de torseur d'efforts est mise en place pour déterminer, très précisement, le comportement dynamique du système usinant (pièce/machine). Les principaux paramètres relatifs au comportement dynamique du système usinant sont identifiés. La localisation des déplacements de la pointe de l'outil dans un plan caractéristique est démontrée. L'existence de ce plan et les corrélations avec les caractéristiques élastiques du système usinant permettent de simplifier le modèle dynamqiue 3D et de proposer un modèle en accord avec les résultats expérimentaux tout en restant dans une configuration tridimentionnelle de la coupe. La simulation numérique issue de ce modèle simplifié fournit des résultats en bon accord avec l'expérience.
5

Yaqub, Sajid. "Proposition d'une démarche pour identifier les efforts de coupe en présence de talonnage." Paris, ENSAM, 2010. http://www.theses.fr/2010ENAM0056.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Le talonnage d'un outil lors de l'usinage fait amortir les vibrations générées et impacte la stabilité du processus d'usinage. Alors, il faut prendre en compte ce phénomène lors de la simulation d'usinage. Ce travail de thèse présente une méthode pour l'identification, la modélisation, et la simulation numérique de talonnage d'un outil lors de l'usinage. La modélisation du talonnage est basée sur l'approche classique du calcul du volume de l'interférence entre la face de dépouille et la surface usinée de la pièce. Un dispositif spécifique a été conçu qui peut créer les conditions nécessaires pour générer l'interférence entre la face de dépouille de l'outil et la surface générée de la pièce. Les modèles géométriques de la pièce et l'outil sont représentés par les z-buffers qui permettent de déduire numériquement le volume de l'interférence en fonction des positions relatives de z-buffers à chaque instant. Les coefficients des efforts de coupe liés au talonnage sont estimés à partir de la méthode de la minimisation d'une erreur des efforts de coupe mesurés et les efforts de coupe simulés
The process damping results from the interference between tool clearance face and the workpiece generated surface and affects the stability of a machining process. Therefore it is necessary to take this phenomenon into consideration during the simulation of machining process. This thesis work presents a practical method for identification, modelling, and numerical simulation of process damping during machining of a workpiece. A special fixture has been used which creates the vibrations conditions necessary to generate the interference between tool clearance face and the specifically designed workpiece. The modelling of process damping is based on the numerical calculation of the interference volume between tool clearance face and the workpiece generated surface. The tool and workpiece geometries are represented by z-buffers whose relative positions at each instant permit to evaluate numerically the interference volume. The process damping coefficients are then estimated by minimization of the error between measured cutting force and the simulated cutting forces
6

Chen, Shouyi. "Caractérisation de la dynamique de coupe en usinage." Compiègne, 1996. http://www.theses.fr/1996COMPD904.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Ladonne, Mathieu. "Modélisation du procédé de perçage assisté par vibrations forcées : prise en compte de l’environnement Pièce-Outil-Machine." Thesis, Paris, ENSAM, 2016. http://www.theses.fr/2016ENAM0006.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Le perçage assisté par vibrations est un procédé assurant la maîtrise dimensionnelle des copeaux pour gagner en fiabilité sur les opérations de perçage. L’ajout d’une oscillation axiale pilotée en amplitude et en fréquence introduit deux nouveaux paramètres à déterminer en adéquation avec les paramètres conventionnels que sont l’avance et la vitesse de coupe. Le paramétrage d’une telle opération n’est donc pas trivial. Afin de fournir un outil d’optimisation du paramétrage du procédé, une nouvelle modélisation prenant en compte l’environnement « Pièce-Outil-Machine » est proposée. L’intégration de la géométrie de l’outil, des spécificités des interactions entre l’Outil et la Matière, et du comportement dynamique de la Machine permet s’adapter aux conditions de mise en oeuvre du procédé. Une méthode d’identification dissociée des éléments de l’environnement « Pièce-Outil-Machine » permet de caractériser les spécificités de chacun de ces éléments. Cette modélisation est validée par une campagne d’essai. La modèle développé dans ces travaux permet donc de prédire le comportement du procédé en vue d’une optimisation des paramètres opératoires
Vibrations assisted drilling is a process which ensures chip shape control in order to increase reliability during drilling operations. The adding of axial oscillation, controlled with amplitude and frequency, introduce two new parameters which must determinate according to the conventional parameters (feed and speed rotation). The optimal setting of vibrations assisted drilling is not obvious. To provide an optimization-tool of the process, a new model which take into account the “Tool-Workpiece-Machine” environment, is proposed. Drill geometry, Tool-Workpiece interactions and dynamic behavior of the Machine are incorporated in the model. Tis specificity allows adjusting behavior of the process with the case of application. An identification methodology is presented to characterize the environment. Simulation’s results and experimental results are compared to validate the model. This model thus allows predicting process behavior in order to optimize the operational parameters
8

Belguith, Rami. "Effets du comportement de la machine et des paramètres d'usinage sur la topographie des surfaces obtenues par fraisage à grande vitesse avec des fraises à bout sphérique monoblocs." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0127.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
L’optimisation des paramètres de coupe en usinage à grande vitesse impose le passage à travers la modélisation des efforts de coupe en intégrant les erreurs d’usinage ainsi que l’analyse de la topographie. La présente étude porte sur l’analyse de l’effet des paramètres de coupe et des erreurs d’usinage sur la topographie des surfaces fraisées avec une fraise à bout sphérique monobloc. Pour y parvenir on a modélisé la géométrie de la fraise en tenant compte des erreurs d’usinage , la zone d’engagement outil-pièce et le calcul de la largeur et de l’épaisseur de coupe en tenant compte de la trace de la dent précédente afin de montrer l’effet des erreurs d’usinage sur les efforts de coupe. Une analyse de la topographie en fonction de tous ces paramètres et des erreurs d’usinage est réalisée en se basant sur une validation expérimentale
The optimization of the cutting parameters in high-speed machining requires the consideration of the machining errors in the modeling of the cutting forces and the surface topography. Therefore, the present study deals with the analysis of the effect of cutting parameters and machining errors on the surface topography of milled surfaces with a ball-end mill. The tool geometry was modeled taking into account all the machining errors such as runout, bending, vibrations and wear. Then, the Cutter Workpiece Engagement region 'CWE ', the cutting width and the uncut chip thickness were modeled taking into account the trace of the previous tooth. Subsequently, thermomechanical modeling of cutting forces in the milling process with a ball-end tool is made considering these errors. Finally, an analysis of the topography according to all these parameters and machining errors was carried out based on experimental validation
9

Kibbou, El Mehdi. "Contribution à la modélisation thermomécanique des vibrations en coupe oblique et à l'établissement d'un plan optimal de maintenance intégré à la production tenant compte des conditions d'usinage." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0234.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Dans cette étude, on s’intéresse à un système de production par usinage qui est l’un des procédés de fabrications les plus adoptés par les différentes industries mécaniques (automobile, aéronautique, ferroviaire…). L'objectif de cette thèse pluridisciplinaire (Mécanique et Génie Industriel) est double : (1) le développement d’un nouveau modèle thermomécanique de la coupe oblique, avec vibration, en usinage à sec et (2) la maximisation du profit afin d’établir conjointement une stratégie de production et un plan de maintenance préventive. Le couplage entre l’opération d’usinage et la partie « optimisation simultanée des coûts de production et de maintenance » se fait à travers la prise en compte de l’effet des conditions de coupe sur l’état de la surface généré et sur l’usure de l’outil de coupe. Dans l’approche proposée, l’usure est prise en compte via la loi empirique de Taylor et l’état de la surface usinée est prédite à travers une nouvelle modélisation des vibrations en coupe oblique. Le premier objectif de la thèse concerne le développement d’une nouvelle modélisation thermomécanique de la coupe oblique avec vibration. Dans ce modèle analytique de coupe, le système vibratoire outil-porte outil est assimilé à un système à un seul degré de liberté dans la direction d’avance. On prend en compte le couplage entre les oscillations de l’outil, le processus thermomécanique de formation du copeau ainsi que l’effet régénératif. Ce dernier résulte de la variation de la quantité de matière à usiner entre deux passes successives. Les sorties de l’outil de la zone de coupe en fonction des conditions de coupe sont également considérées. Le couplage entre l’ensemble de ces mécanismes rend le problème à résoudre fortement non linéaire. Un algorithme de résolution permettant de réduire le temps de calcul a été mis en place. Le deuxième objectif de la thèse est réalisé par le biais du développement d’un modèle analytique. Dans ce modèle, le profit à maximiser, intègre les revenus de vente du produit fini, les coûts de production et de maintenance tout en considérant l’impact des conditions d’usinage sur les coûts de production, la qualité des pièces usinées ainsi que la dégradation du système de production. On prend donc en compte d’une manière simultanée l’impact des conditions d’usinage sur trois aspects fondamentaux pour la partie « optimisation simultanée des coûts de production et de maintenance ». Le premier concerne l’impact des conditions d’usinage sur la durée et les coûts de production. Le deuxième concerne l’impact sur la dégradation du système d’usinage et par conséquent sur le plan de maintenance optimal à adopter. Le troisième concerne l’impact sur la qualité du produit fini qui affecte directement les coûts de vente et plus précisément les coûts de reviens. Ces interactions sont prises en considération par le biais du développement d’un modèle analytique afin d’établir un plan optimal de maintenance intégrée à la production pour le système d’usinage
In this study, we are interested in a machining production system which is one of the manufacturing processes most adopted by the various mechanical industries (automotive, aviation…etc.). The objective of this multidisciplinary thesis (Mechanics and Industrial Engineering) is double: (1) the development of a new thermomechanical model of oblique cutting in dry machining and (2) the maximization of profit in order to establish a strategy production and a preventive maintenance plan.The coupling between the machining operation and the part "simultaneous optimization of production and maintenance costs" is done by considering the effect of cutting conditions on the generated surface quality and on the tool wear. In the proposed approach, wear is taken into account through Taylor's empirical law and the machined surface quality is predicted via a new model of vibrations in oblique cutting.The first objective of this work concerns the development of a new thermomechanical model of the oblique cutting with vibration. In this analytical cutting model, the vibratory system is assimilated to a system with a single degree of freedom in the tool feed direction. We take into account the coupling between tool oscillations, the thermomechanical process of chip formation as well as the regenerative effect. The latter results from the variation in the material quantity to be machined between two successive passes. The coupling between all of these mechanisms makes the problem to be solved strongly nonlinear. A resolution algorithm making it possible to reduce the computation time has been implemented.The second objective of the thesis is achieved through the development of an analytical model where the optimization consists in maximizing a profit integrating selling price of finished product, production and maintenance costs. We note the originality of this part consists in considering the impact of the machining conditions, especially the cutting speed, on the production durations and costs, the quality of the machined parts as well as the degradation of the production system. The impact of machining conditions on three fundamental aspects is therefore considered simultaneously for the "simultaneous optimization of production and maintenance costs" part. The first concerns the impact of machining conditions on production time and costs. The second concerns the impact on the degradation of the machining system and therefore on the optimal maintenance plan to be adopted. The third concerns the impact on the quality of the output product which directly affects the selling costs and more specifically the total profit. These interactions are taken into account through the development of an analytical model to establish an optimal integrated production maintenance plan for the machining system, illustrated by the optimal switching date for changing cutting speed and the optimal numbers of batches to produce before every preventive maintenance action for every production phase. Every production phase is characterized by a cutting speed
10

Castro, Martinez Luis Ricardo. "Identification des sources de vibration en usinage : étude expérimentale et numérique." Metz, 2006. http://docnum.univ-lorraine.fr/public/UPV-M/Theses/2006/Castro_Martinez.Luis_Ricardo.SMZ0624.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
L'objectif principal de ce projet est d’apporter des informations destinées à clarifier la physique des vibrations en usinage à partir de la coupe orthogonale en tournage. Le premier chapitre comprend la caractérisation des procédés d'usinage en utilisant les efforts de coupe en présence de vibrations. Nous réalisons une évaluation dans le domaine fréquentiel des dynamomètres piézoélectriques et de l'influence des composants de montage, ce qui dévoile les problèmes des mesures dynamiques. A la fin de cette première partie nous proposons une méthode de correction sur les mesures des dynamomètres piézoélectriques au-delà de leur bande passante et nous présentons également une application de cette méthode. Le second chapitre est consacré à la compréhension des sources de vibration en coupe orthogonale. Nous analysons spécialement la formation du copeau segmenté dentelé et son évolution en fonction des conditions de coupe, puisque le rôle de ce phénomène comme source d'excitation n’est pas suffisamment éclairé dans la littérature. De plus, nous discutons les effets des excitations régénératives, qui dépendent de l’interaction entre les conditions de coupe et de la reponse structurelle de la machine-outil. Le troisième chapitre comprend l'identification expérimentale des causes des vibrations durant l'usinage. Nous avons identifié et caractérisé la formation du copeau dentelé et la réponse dynamique de la machine-outil. Le dernier chapitre comprend la modélisation, laquelle contribue à l'éclaircissement de la physique du processus de coupe, ce qui peut être utilisé pour étudier des aspects comme l’usure de l’outil, la finition des pièces ou la conservation des tolérances
The main objective of this project is furnishing information to clarify the vibrations physics in machining from orthogonal cutting. First chapter contains the machining process characterisation by means of cutting forces. We evaluate the piezoelectric dynamometers in frequency domain and the influence of assembly components. These evaluations reveal the dynamic measurements problems. At the end of this part, we propose a correction method of piezoelectric dynamometer measurements to frequencies higher than dynamometer bandwidth. Also, we present an application of the method. Second chapter comprises the understanding of vibration sources. We analyse specially the segmented chip formation because its excitation role is not clear in literature. Also, we consider the effects of regenerative excitations, which depend of interaction between cutting conditions and machine-tool dynamic response. Third chapter includes the experimental identification of vibration sources during machining. We have identified and characterized the segmented chip formation and the machine-tool dynamic
More sources

Books on the topic "Coupe – Vibrations":

1

Ross, Richard. Patently Erotic: Tear-Away Bras, Couple¿s Chairs, Vibrating Condoms, and Patented Strokes of Genius. Plume, 2005.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Coupe – Vibrations":

1

Awrejcewicz, Jan, Anton V. Krysko, Maxim V. Zhigalov, and Vadim A. Krysko. "Thermoelastic Vibrations of Timoshenko Microbeams (Modified Couple Stress Theory)." In Advanced Structured Materials, 295–332. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-55993-9_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Mızrak, Sinem, and Ender Ciğeroğlu. "Nonlinear Free Vibrations of Functionally Graded Microplates Based on the Modified Couple Stress Theory." In NODYCON Conference Proceedings Series, 395–405. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-81170-9_35.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Xia, Yuanfeng, Jian Pang, Chengtai Hu, Cui Zhou, and Zhijun Zhang. "Study on Second-Order Vibration Caused by Secondary Couple of Cardan Joint for a 4WD Driveline." In Lecture Notes in Electrical Engineering, 345–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-662-45043-7_36.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Thanh, Cuong-Le, Samir Khatir, and M. Abdel Wahab. "Free Vibration of Angle-Ply Laminated Micro-plates Using Isogeometric Analysis and Modified Couple Stress Theory." In Lecture Notes in Mechanical Engineering, 844–52. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8331-1_67.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Bhattacharya, Sujash, and Debabrata Das. "A Study on Free Vibration Behavior of Microbeam Under Large Static Deflection Using Modified Couple Stress Theory." In Lecture Notes in Mechanical Engineering, 155–64. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-0772-4_14.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Balkanski, M., and R. F. Wallis. "Lattice vibrations in semiconductors." In Semiconductor Physics and Applications, 121–52. Oxford University PressOxford, 2000. http://dx.doi.org/10.1093/oso/9780198517412.003.0007.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract An important source of deviations from periodicity in a crystal is the displacement of an atom from its equilibrium position. These deviations arise naturally from the thermal energy of the atoms. If the crystal is in a stable configuration, the displacement of an atom leads to a force that tends to restore the atom to its equilibrium position. However, the kinetic energy of the atom causes it to overshoot the latter. As a result the atom vibrates about its equilibrium position. The forces of interaction between atoms couple the atomic vibrations together, giving rise to lattice vibrations.
7

Zhou, H.-J., Q.-B. Li, and F.-M. Wang. "Boundary Element Method for Couple D Vibration Analysis of Dam-Water System." In Structures and Stochastic Methods, 189–96. Elsevier, 1987. http://dx.doi.org/10.1016/b978-0-444-98955-0.50019-7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

McCabe, Susan. "Cold War Romances." In H. D. & Bryher, 281–95. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780190621223.003.0022.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Bryher and Pearson increasingly became terrorized during the Cold War, fearing the Soviets and atomic war. Perdita married John Schaffner, and Bryher visited New York to help settle the couple and to outfit Perdita for her first child. They told H.D. a different date for the pregnancy so she would not have sympathetic pains. Bryher now knew Schmideberg was an alcoholic, manipulating her with his neediness. She fled to the Scillies, to New York, to see H.D. in Lausanne and Lugano. Feeling the “old H.D. vibration,” H.D. began Helen in Egypt. From Lugano, she sent Bryher and Pearson typed pages, wanting each to note in the margins any qualms. In fact, Bryher became so interactive with H.D., the latter begged off more inspiration. After returning to Lausanne, and Bryher away with the “Schaffs,” While studying trends in parapsychology, H.D. suffered abdominal cramping, needing immediate surgery to disentangle her intestines. They decided Kusnacht would serve for recuperation.
9

Machover, Wilma, and Marienne Uszler. "Choosing an Instrument." In Sound Choices, 163–204. Oxford University PressNew York, NY, 1996. http://dx.doi.org/10.1093/oso/9780195092073.003.0005.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract Finding an istrument for your child is something like helping him find a friend. Instruments have personalities, just as your child does. You know your child. This chapter will tell you about the instruments and how to make a good match between your child and an instrument. Making music in a certain way is a very personal choice. Tastes differ considerably. Some children love holding a violin or cello, feeling the vibrations as they move the bow across the strings, changing each sound as they form it. For other children, even those who are very musical, this is awkward or unattractive. Some children enjoy being alone at a keyboard, can cope with two-staff reading, and like the idea that they can play the melody and harmony at the same time. Others feel that playing the piano is mechanical or too complicated. The point is that most of us enjoy making music chiefly (perhaps only) in a certain way—bowing, blowing, strumming, drumming, singing, or pushing down keys. Don’t think that if your child considers playing a piano, cello, or flute unappealing, she is unmusical or disinterested in making music. She may just need to find an instrument she’s attracted to and comfortable with.

Conference papers on the topic "Coupe – Vibrations":

1

De Santiago, Oscar, and Luis San Andrés. "Dynamic Response of a Rotor-Integral Squeeze Film Damper to Couple Imbalances." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0388.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Squeeze film dampers (SFDs) are used in high speed rotating machinery to reduce rotor vibration amplitudes and to isolate transmitted loads through the bearing support structures. SFDs are also effective means to ameliorate destructive subsynchronous vibrations excited by hydrodynamic bearings, seals, impellers and other unknown sources. Modern jet engines demand lighter and flexible structures with compact components to obtain the largest power to weight ratios. This current trend makes evident rotordynamic phenomena that must be adequately addressed by dissipation elements such as SFDs. Integral squeeze film dampers (ISFDs) incorporating built in elastic supports are of reduced weight and length, offer accuracy of positioning, and a split segment construction allowing easier assembly, inspection and retrofit. Yet ISFDs require of extensive experimentation to verify their dynamic forced performance and to prove their reliability for applications on high performance turbomachinery. Measurements of the synchronous response of a test rotor supported on ISFDs and due to couple-imbalances are hereby presented. Masses inserted at two axial planes in the rotor and out of phase by 180° excite the second (conical) mode of vibration of the test rotor. Peak rotor responses at the second critical speeds, vertical and horizontal, allow the determination of amplification factors from which system damping coefficients for the rotor conical motions are extracted. The measurements verify the damping capacity of ISFDs to reduce (conical mode) rotor vibrations.
2

Hohl, Andreas, Christian Siewert, Lars Panning, and Andreas Kayser. "Nonlinear Vibration Analysis of Gas Turbine Bladings With Shroud Coupling." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-50787.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Rotating blades are subjected to vibrations caused by excitation forces due to a non-homogeneous pressure field of the fluid. Therefore, damping devices like tip shrouds are implemented which reduce the vibrational amplitude and apply additional stiffness and damping to the structure. To predict the resulting vibration response and stresses, a three dimensional contact model has been developed to determine the friction forces. The resulting equations of motion are solved in the frequency domain. The developed method has been implemented in a nonlinear forced response code called DATAR designed for the gas turbine division of Siemens Energy. In this paper, the transfer of common Finite Element models of bladings with shrouds or underplatform dampers to the DATAR code is presented. A mapping procedure based on Finite Element shape functions is used to couple the model with the regular contact grid used in the nonlinear vibration analysis performed with the DATAR code. As a practical example, the vibration behavior of a gas turbine blading with interlocked shrouds is investigated with the developed method.
3

Bachschmid, N., S. Bistolfi, S. Chatterton, M. Ferrante, and E. Pesatori. "Some Remarks on the Dynamic Behaviour of Integrally Shrouded Blade Rows." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-48320.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Actual trend in steam turbine design is to use blades with integral shrouds, for high pressure and intermediate pressure steam turbine sections, as well as also for the long blades of the low pressure sections. The blades are inserted with their root into the seat on the shaft in such a way that the blades are slightly forced against each other in correspondence of the shrouds. In long blades of low pressure stages the forcing can be obtained by the untwisting of twisted blades due to the effect of the huge centrifugal forces. The dynamic behavior of these blade rows is difficult to predict due to the nonlinear effect of the contact forces and due to friction. Different models for the contact are proposed and compared. The resulting natural frequencies of the blade row as a function of the different nodal diameter mode shapes are highly depending on the assumed models. For avoiding resonant conditions with engine order excitations, the natural frequencies must be calculated with good accuracy. Some of the modes of the blade row, typically for the last stage of the low pressure steam turbine, can couple with some vibration modes of the rotor: flexural vibrations of the shaft couple with 1 nodal diameter mode shape of the row in axial direction and torsional vibrations of the shaft couple with the 0 nodal diameter mode in tangential direction. Therefore analyses of lateral and torsional vibrations of low pressure steam turbine shafts require also an accurate analysis of the blade row vibration modes.
4

Chauhan, Abhishek, Pritam Rout, and Ksh Milan Singh. "Vibration Parameters Estimation using mHDFT Filter in PLL Technique." In 2020 International Conference on Computational Performance Evaluation (ComPE). IEEE, 2020. http://dx.doi.org/10.1109/compe49325.2020.9200039.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Fernandes, Antonio Carlos, Sina Mirzaei Sefat, Luis Victor Casca˜o, Pedro Vilas Boas, and Ricardo Francis. "Further Investigations on Vortex Self Induced Vibration (VSIV)." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-50187.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
An experimental facility has been designed to study the transversal and response associated with vortex-induced vibration of a totally submerged horizontal cylinder hang on horizontally elastic support under the influence of vertical harmonic oscillating motion. The study aims to analyze the vortex self induced vibration (VSIV) phenomena, which occurs for instance with Steel Catenary Risers (SRCs) the deep offshore connected to floating platforms. These vibrations occur even in the absence of a current. The experiments were conducted in a tank at the LOC/COPPE/UFRJ (Laboratory of Waves and Current of COPPE, Federal University of Rio de Janeiro). The tests were carried out with Keulegan-Carpenter numbers equal to 10 and 20 and for several exciting frequencies. The vertical trajectories of the VSIV motion were then classified based on its different configurations such as oval-shape, eight-shape and etc. Different ranges of reduced velocities were also considered. The amplitude and frequency of transversal motion and also the forces calculated.
6

Gequn, Shu, Wei Jingsi, Wei Haiqiao, and Chen Xinwei. "Research on Couple Mechanism of Heat Release and Acoustic Characteristics during Combustion of Butane in Close Chamber." In SAE 2007 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2007. http://dx.doi.org/10.4271/2007-01-2175.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Marek, Sikoń. "Use of Cosserat birefringence to measurement couple stresses by photoelasticity." In 11TH INTERNATIONAL CONFERENCE ON VIBRATION MEASUREMENTS BY LASER AND NONCONTACT TECHNIQUES - AIVELA 2014: Advances and Applications. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4879574.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Blanchet, Pat, and Harvey Lipkin. "Dual Properties for Vibration Analysis via Screw Theory." In ASME 1998 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/detc98/mech-5868.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract Recent discoveries about the structure of stiffness and inertia are combined to analyze free linear vibrations. It is shown that the dual to a pure translation mode is a pure couple mode. The analysis is performed for the general case and then specialized to more simple problems. The results also develop the conditions for the existence of pure translation and couple modes. Examples illustrate the results.
9

Pol, P. Santamarina. "Dynamic and Static Design of Engine Test Benches." In ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0306.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
Abstract The elastic mechanical strength of the large and medium reciprocating engine test benches, is calculated for vertical and horizontal bendings and for torsion. The dynamic loads - horizontal vibrating forces and vertical vibrating couples (bending and torsion) and horizontal vibrating couple,- and the static loads, - distributed weight of the bench itself and the machinery and the motor torque (torsion), - are analyzed. It is pointed out that the bench body of reinforced concrete is submitted to bending moments and shearing forces and to torsion couples. This paper is the continuation of the paper “Dynamic Loads in Engine Test Benches” in 12th Biennial ASME Conference on Mechanical Vibration and Noise.
10

Song, Guochenhao, Zhuang Mo, and J. Stuart Bolton. "A Transfer-Matrix-Based Approach to Predicting Acoustic Properties of a Layered System in a General, Efficient, and Stable Way." In Noise and Vibration Conference & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2023. http://dx.doi.org/10.4271/2023-01-1052.

Full text
APA, Harvard, Vancouver, ISO, and other styles
Abstract:
<div class="section abstract"><div class="htmlview paragraph">Layered materials are one of the most commonly used acoustical treatments in the automotive industry, and have gained increased attention, especially owing to the popularity of electric vehicles. Here, a method to model and couple layered systems with various layer types (i.e., poro-elastic layers, solid-elastic layers, stiff panels, and fluid layers) is derived that makes it possible to stably predict their acoustical properties. In contrast with most existing methods, in which an equation system is constructed for the whole structure, the present method involves only the topmost layer and its boundary conditions at two interfaces at a time, which are further simplified into an equivalent interface. As a result, for a multi-layered system, the proposed method splits a complicated system into several smaller systems and so becomes computationally less expensive. Moreover, traditional modeling methods can lose stability when there is a large disparity between the magnitudes of the waves within the layers (e.g., at higher frequencies, for a thick layer, or for extreme parameter values). In those situations, the contribution of the most attenuated wave can be masked by numerical errors, hence inducing instability when inverting the system. Here, the accuracy of the wave attenuation terms is ensured by decomposing each layer’s transfer matrix analytically and reformulating the equation system. Therefore, this method can produce a stable prediction of acoustical properties over a large frequency and parameter region. The fact that the proposed method can couple different layer types in a general, efficient, convenient, and stable way is beneficial, for example, when numerically optimizing the design of the acoustical treatments. The predicted acoustic properties of layered systems calculated using the proposed method have been validated by comparison with those predicted by previously existing methods. Further, an optimal design exercise is performed to find a lightweight layered dash panel treatment.</div></div>

To the bibliography