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Добірка наукової літератури з теми "Contact vibration"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Contact vibration"

Mohanty, Lipi, Yaowen Yang, and Swee Tjin. "Passively Conducted Vibration Sensing with Fiber Bragg Gratings." Applied Sciences 8, no. 9 (September 10, 2018): 1599. http://dx.doi.org/10.3390/app8091599.

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Measuring vibrations is a common method of monitoring the integrity of structures and heavy machinery, that are subject to dynamic loads. Strong vibrations for prolonged periods of time can be caused by various sources, such as trains, motors and heavy machinery. These strong vibrations should be identified and managed to ensure operational safety. This study proposes a flexible metal beam sensor with a fiber Bragg grating (FBG) mounted on the surface to measure the vibrational frequency. We present a sensor for measuring the vibrational frequencies on-site by placing the beam so that it makes physical contact with the vibrating body. The sensor has been tested in the range of 50–200 Hz. The sensing beam can detect the vibrations that are induced in other metallic bodies where there are metallic structures of low stiffness to conduct the vibration. The results show that the sensing beam is capable of detecting the frequency of forced vibrations from its periphery when placed in different orientations.

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Lackner, James R., Ely Rabin, and Paul DiZio. "Fingertip Contact Suppresses the Destabilizing Influence of Leg Muscle Vibration." Journal of Neurophysiology 84, no. 5 (November 1, 2000): 2217–24. http://dx.doi.org/10.1152/jn.2000.84.5.2217.

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Touch of the hand with a stationary surface at nonmechanically supportive force levels (<1 N) greatly attenuates postural sway during quiet stance. We predicted such haptic contact would also suppress the postural destabilization caused by vibrating the right peroneus brevis and longus muscles of subjects standing heel-to-toe with eyes closed. In experiment 1, ten subjects were tested under four conditions: no-vibration, no-touch; no-vibration, touch; vibration, no-touch; and vibration, touch. A hand-held physiotherapy vibrator (120 Hz) was applied ∼5 cm above the malleolous to stimulate the peroneus longus and brevis tendons. Touch conditions involved contact of the right index finger with a laterally positioned surface (<1 N of force) at waist height. Vibration in the absence of finger contact greatly increased the mean sway amplitude of the center of pressure and of the head relative to the no-vibration, no-touch control condition ( P < 0.001). The touch, no-vibration and touch-vibration conditions were not significantly different ( P > 0.05) from each other and both had significantly less mean sway amplitude of head and of center of pressure than the other conditions ( P < 0.01). In experiment 2, eight subjects stood heel-to-toe under touch and no-touch conditions involving 40-s duration trials of peroneus tendon vibration at different duty cycles: 1-, 2-, 3-, and 4-son and off periods. The vibrator was attached to the subject's leg and remotely activated. In the no-touch conditions, subjects showed periodic postural disruptions contingent on the duty cycle and mirror image rebounds with the offset of vibration. In the touch conditions, subjects were much less disrupted and showed compensations occurring within 500 ms of vibration onset and mirror image rebounds with vibration offset. Subjects were able to suppress almost completely the destabilizing influence of the vibration in the 3- and 4-s duty cycle trials. These experiments show that haptic contact of the hand with a stable surface can suppress abnormal proprioceptive and motor signals in leg muscles.

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Mo, Yue Ping, Hong Jin, Peng Fei Xu, Dong Liu Jiang, and Yun Jing Liu. "The Experimental Research of a Piezoelectric Linear Motor." Applied Mechanics and Materials 130-134 (October 2011): 621–24. http://dx.doi.org/10.4028/www.scientific.net/amm.130-134.621.

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Анотація:

The working principle and driven approach of a piezoelectric linear motor which uses axial stretching vibration of cascading piezoelectric elements is introduced. The prototype of that motor is designed and fabricated. It’s performance is also tested. The motor’s vibrator is a stick and moving object is a cylindrical ring which contacts with vibrating stick in the shape of cylindrical surface. The forward and backward movements of moving object are achieved by utilizing the axial stretching vibration of vibrating stick. The moving direction is altered by changed the frequency of driving signal. The structure of the motor is simple and the power supply is single sine phase. So that it is easy to be smaller. In addition, the thrust force is increased by cylindrical surface contact between moving object and vibrating stick so that it is easy to be practical also. This kind of piezoelectric linear motor is very suitable for precise positioning of objects, fine material handling, and vibration cutting tools.

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Soom, Andres, and Jern-Wen Chen. "Simulation of Random Surface Roughness-Induced Contact Vibrations at Hertzian Contacts During Steady Sliding." Journal of Tribology 108, no. 1 (January 1, 1986): 123–27. http://dx.doi.org/10.1115/1.3261131.

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Random normal contact vibrations, excited by surface irregularities swept through the contact region of Hertzian contacts during sliding, are studied using digital simulation techniques. The input disturbances are modeled as random time processes with specified spectral content in the spatial wavenumber and frequency domains. The Hertzian contact stiffness is modeled directly or through a bilinear approximation. The contact vibration spectra and resulting mean square contact loading are obtained from the simulations. A comparison with previous measurements shows good agreement between the simulation and experimental results.

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Wi, Daehan, and Angela A. Sodemann. "Exploring User Perception Challenges in Vibrotactile Haptic Display Using Resonant Microbeams under Contact with Skin." Multimodal Technologies and Interaction 3, no. 2 (May 28, 2019): 38. http://dx.doi.org/10.3390/mti3020038.

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Resonant vibrotactile microbeams use the concept of resonance to excite the vibration of cantilever beams, which correspond to pixels of an image. The primary benefit of this type of tactile display is its potential for high resolution. This paper presents the concept of the proposed system and human skin contact experiments to explore user perception challenges related to beam vibration during skin contact. The human skin contact experiments can be described in five phases: dried skin contact to metal beam tips, wet and soaped skin contact to metal beam tips, skin contact with a constraint, normal force measurement, and skin contact to the tips of silicone rubber beams attached to metal beam tips. Experimental results are analyzed to determine in what cases of skin contact the beams stop vibrating. It is found that the addition of silicone rubber beams allows the primary metal beams to continue vibrating while in contact with skin. Thus, the vibration response of a metal beam with silicone rubber beams is investigated for the better understanding of the effect of silicone rubber beams on the metal beam vibration.

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Xu, Shaoyi, Fangfang Xing, Ruilin Wang, Wei Li, Yuqiao Wang, and Xianghui Wang. "Vibration sensor for the health monitoring of the large rotating machinery: review and outlook." Sensor Review 38, no. 1 (January 15, 2018): 44–64. http://dx.doi.org/10.1108/sr-03-2017-0049.

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Purpose At present, one of the key equipment in pillar industries is a large rotating machinery. Conducting regular health monitoring is important for ensuring safe operation of the large rotating machinery. Because vibrations sensors play an important role in the workings of the rotating machinery, measuring its vibration signal is an important task in health monitoring. This paper aims to present these. Design/methodology/approach In this work, the contact vibration sensor and the non-contact vibration sensor have been discussed. These sensors consist of two types: the electric vibration sensor and the optical fiber vibration sensor. Their applications in the large rotating machinery for the purpose of health monitoring are summarized, and their advantages and disadvantages are also presented. Findings Compared with the electric vibration sensor, the optical fiber vibration sensor of large rotating machinery has unique advantages in health monitoring, such as provision of immunity against electromagnetic interference, requirement of less insulation and provision of long-distance signal transmission. Originality/value Both contact vibration sensor and non-contact vibration sensor have been discussed. Among them, the electric vibration sensor and the optical fiber vibration sensor are compared. Future research direction of the vibration sensors is presented.

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Ometron Ltd. "Non-contact vibration measurement." NDT & E International 24, no. 1 (February 1991): 60. http://dx.doi.org/10.1016/0963-8695(91)90811-g.

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Popp, Karl, Lars Panning, and Walter Sextro. "Vibration Damping by Friction Forces: Theory and Applications." Journal of Vibration and Control 9, no. 3-4 (March 2003): 419–48. http://dx.doi.org/10.1177/107754603030780.

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Анотація:

In this paper, we deal with the vibrational behavior of mechanical structures interconnected by contacts with friction. The focus is set on the utilization of friction forces that are generated in the contact interfaces with the objective to increase damping and to reduce vibration amplitudes in order to prevent structures from failures owing to high resonance stresses. We present a comparison and classification of different contact models that are most commonly used, including the derivation of a three-dimensional contact model under consideration of rough surfaces. We give different solution methods for problems with non-linear friction elements. The effectiveness of friction damping devices is pointed out by a single-degree-of-freedom friction oscillator, beam-like structures with frictional interfaces and different underplatform dampers in turbo-machinery applications. It can be shown that in many practical applications friction damping devices provide a remarkable decrease of vibration amplitudes.

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Bryja, Danuta, and Adam Popiołek. "Vibrations of the overhead catenary caused by the passage of a high-speed train through the track stiffness discontinuity." Transportation Overview - Przeglad Komunikacyjny 2018, no. 6 (June 1, 2018): 21–31. http://dx.doi.org/10.35117/a_eng_18_06_03.

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The paper presents the methodology for simulating vibrations of the railway catenary, caused by the passage of the train through the track stiffness discontinuity. The concept of the simulation algorithm takes into account the dynamic interaction between pantographs and the overhead contact wire as well as nonlinearity resulting from the specificity of the droppers behaviour, which do not carry compression - they only carry tensile forces. The coupling of track and rail vehicles vibrations is also included. According to physics, the effect of vibrations of the catenary carried by pantographs on the railway vehicle was not taken into account, which allowed to divide the simulation algorithm into two stages and develop two computer programs with a defined hierarchy of operation. In the first stage of the simulation, the time-histories of vibrations and vibration velocities of those train cars, on which the pantographs are mounted, are calculated. In the second stage, the previously calculated time-histories are set as the input data and the vibration characteristics of the catenary and contact force between pantograph and the contact wire are calculated. The paper presents examples of vibration simulations of a rail vehicle observed in real time at the theoretical point of the pantograph base. The results of the second stage of the simulation were also shown: selected vibration time-histories of the pantograph and the five-span section of the catenary, and oscillations of the contact force between pantograph and the contact wire. The impact of the track stiffness discontinuity on catenary vibration was assessed.

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Murthy, Perunalla PBGSN, Ch Srinivasa Rao, and K. Venkata Rao. "Tool and work piece vibrations measurement - a review." Independent Journal of Management & Production 9, no. 4 (December 1, 2018): 1254. http://dx.doi.org/10.14807/ijmp.v9i4.801.

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Tool condition monitoring is one of the important aspects in machining process to improve tool life. It comprises three important steps namely machining data acquisition, data analysis and decision making. Vibration in metal cutting has direct impact on the tool life as well as surface roughness. The present study focused on measurement of vibration during the machining process. Data acquisition is made by using various types of sensors. A wide variety of technologies like contact and non contact sensors have been used for real time data acquisition of tool or work piece vibrations. Research works carried out by many authors is highlighted in measurement of cutting tool and machine tool vibrations using different sensors. Influence of various input parameters like tool geometry, feed, speed and depth of cut on the magnitude of vibrations is discussed. Influence of vibration on surface roughness, tool life and power consumption is reviewed. Three dimensional vibration measurement with single Laser Doppler Vibrometer is also covered for precise analysis of vibration.

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Більше джерел

Дисертації з теми "Contact vibration"

Trapuzzano, Matthew A. "Controlled Wetting Using Ultrasonic Vibration." Scholar Commons, 2019. https://scholarcommons.usf.edu/etd/7974.

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Many industrial processes such as printing and cleaning, as well as products like adhesives, coatings, and biological testing devices, rely on the wetting of liquids on a surfaces. Wetting is commonly controlled through material selection, coatings, and/or surface texture, but these means are sensitive to environmental conditions. Wetting is influenced by variables like surface tension, density, the surface chemistry, local energy barriers like surface roughness, and how the droplet is placed on the surface. Wetting of droplets can also be influenced externally in many ways such as introducing surfactants, applying electrical fields, or by dynamically excitation. Low-frequency, high amplitude vibration can initiate wetting changes prompted by droplet contact line oscillations that exceed the range of stable contact angles inherent of a droplet on a solid surface. The study of ultrasonic vibration wetting and spreading effects is sparse [1, 2], and is usually only qualitatively analyzed. Therefore, the specific goal of this thesis is somewhat unique, but also has potential as a means to controllably reverse surface adhesion. High frequency vibration effects and the governing mechanisms are relatively uncharacterized due to difficulties posed by the spatial and temporal scales. To investigate, droplets of 10, 20, and 30 µL are imaged as they vibrate on a hydrophobic surface forced via a piezoelectric transducer over different high frequencies (>10 kHz). Wetting transitions occur abruptly over a range of parameters, but coincide with transducer resonance modes. The magnitude of contact angle change is dependent on droplet volume and surface acceleration, and remains after cessation of vibration, however new droplets wet with the original contact angle. A more detailed investigation of this phenomenon was necessary to obtain a better understanding. This required repeatable testing conditions, which relies heavily on surface integrity. However, some “hydrophobic” coatings are sensitive to extended water exposure. To determine which hydrophobic coatings may be appropriate for investigating dynamic wetting phenomena, samples of glass slides coated with a series of fluoropolymer coatings were tested by measuring water contact angle before, during, and after extended submersion in deionized water and compared to the same coatings subjected to ultrasonic vibration while covered in deionized water. Both methods caused changes in advancing and receding contact angle, but degradation rates of vibrated coatings, when apparent, were significantly increased. Prolonged soaking caused significant decreases in the contact angle of most coatings, but experienced significant recovery of hydrophobicity when later heat-treated at 160 C. Dissimilar trends apparent in receding contact angles suggests a unique degradation cause in each case. Roughening and smoothing of coatings was noted for coatings that were submerged and heat-treated respectively, but this did not correlate well with the changing water contact angle. Degradation did not correspond to surface acceleration levels, but may be related to how well coatings adhere to the substrate, indicative of a dissolved coating. Most coatings suffered from contact angle degradation between 20-70% when exposed to water over a long period of time, however the hydrophobic fluoropolymer coating FluoroSyl was found to remain unchanged. For this reason it was found to be the most robust coating for providing long term wetting repeatability of vibrated droplets. Droplets (10 to 70 µL) were imaged on hydrophobic surfaces as they were vibrated with ultrasonic piezoelectric transducers. Droplets were vibrated at a constant frequency with ramped amplitude. Spreading of droplets occurs abruptly when a threshold surface acceleration is exceeded of approximately 20,000 m/s2. Droplet contact area (diameter) can be controlled by varying acceleration levels above the threshold. The threshold acceleration was relatively independent of droplet volume, while initial contact angle impacts the extent of spreading. Wetting changes remain after cessation of vibration as long as the vibrated droplet remained within the equilibrium contact angle range for the surface (> the receding contact angle), however new droplets wet with the original contact angle except for some cases where vibration of liquid can affect the integrity of the coating. Reversible wettability of textured surfaces is a desired effect that has various industry applications where droplet manipulation is used, like biomedical devices, coating technologies, and agriculture [3-5].

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Mignosi, Christine. "Non-contact optical sensing for vibration measurement." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.341505.

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JOSHI, PRASAD RAMAN. "AN ELASTIC CONTACT THEORY FOR MODELING VIBRATION TRANSMISSIBILITY THROUGH ROLLING CONTACT BEARINGS." University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1092882073.

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Liu, Gavin Chunye. "Vibration analysis of a thin moving web and its finite element implementation /." Online version of thesis, 1992. http://hdl.handle.net/1850/10698.

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Schreiner, Zeljko. "Vibration and capacitance coupling method for electrical contact evaluation." Thesis, University of Bath, 2004. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407480.

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Fagiani, Ramona. "Tribological activation of tactile receptors by vibrations induced at the finger contact surface." Phd thesis, INSA de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00715822.

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Анотація:

This thesis deals with the tribological and dynamic aspects of tactile perception given by the scanning of the finger on a surface. The attention is focused on a direct analysis of the vibration spectrum characteristics, induced by the surface features that is a relatively new research field. In fact, it is accepted that vibrations activate the tactile afferents and their essential role for the perception of fine textures (duplex theory of tactile texture perception) but it is still unknown the link with the surface texture characteristics and the features of the induced vibration spectra. The work is aimed to contribute to a better understanding of the mechanisms of the tactile sense, that is basilar for manifold different applications: textile quality quantification, ergonomics of everyday objects (which largely affects their commercial competitiveness), identification of surface imperfections, the design of tactile communication devices, the development of artificial tactile sensors for intelligent prostheses or robotic assistants, the development of human-machine interfaces for interaction with virtual realities or teleoperation systems, such as for telediagnosis or microsurgery, reproducing real perception (virtual reality), increasing the human perception (augmented reality), development of tests for evaluation of tactile sensitivity during diagnosis or monitoring process in rehabilitation. The study of a finger that moves on a surface involves different difficulties that are related to the material characteristics and to the measurements themselves. For these reasons, a new experimental set-up, named TriboTouch, has been developed to reproduce the finger/surface scanning phenomena under real values of the contact feature (scanning velocity and amplitude, surface roughness, etc..), avoiding undesired vibrations. The test bench has been designed to guarantee the measurements reproducibility and to perform measurements without introducing external noise. The set-up permits to carry out both measurements of the global dynamics and local ones (at the contact zone) employing a silicone fake finger. In the presented analysis, the behavior of the right hand index finger scanning on the surface sample with periodical and isotropic roughness and on textiles has been investigated for different scanning speed, highlighting the role of fingerprints A simple numerical model have been developed for reproducing the behavior of the induced vibrations when sliding two periodical surfaces and the numerical results have been compared with the experimental ones. The presented work has shown the possibility to obtain objective indexes for the tactile perception characterization, by means of the friction induced vibration spectrum analysis, in agreement with the neurophysiological studies present in literature.

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Brunetti, Jacopo. "Mechanical energy balance of frictional contacts : From surface to solid energy dissipation in contact dynamic instabilities." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0118/document.

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Chaque fois que se produit un mouvement relatif entre deux systèmes, avec une interface à contact sec, le contact frottant induit des vibrations. La dynamique locale au contact (ruptures et la génération d'ondes) se couple avec la dynamique du système, donnant origine à des vibrations et affectant le comportement frictionnel macroscopique du système. Dans cette thèse, afin de développer une approche globale pour l'investigation des phénomènes multi-physiques, l'énergie a été utilisée comme une caractéristique physique universelle du couplage. La formulation de un bilan énergétique mécanique est utilisé pour identifier deux termes dissipatifs différents, i.e. la dissipation par amortissement matériel/système et la dissipation au contact. Les flux d'énergie, provenant des surfaces en contact et dus aux vibrations induites par frottement, excitent la réponse dynamique du système et, vice versa, l'influence de la réponse dynamique du système sur la dissipation d'énergie locale à l'interface de contact affecte les phénomènes tribologiques connexes. Dans cette thèse, les vibrations induites par le frottement ont été analysées en utilisant: l'approche par éléments finis pour étudier, par l'analyse des flux d'énergie, le couplage entre le contact et la dynamique du système; l'approche expérimentale pour valider les résultats numériques et observer l'influence des phénomènes pas encore inclus dans les modèles numériques; une approche avec une modèle à paramètres concentrés pour évaluer rapidement les effets des paramètres du système. L'analyse numérique par le modèle éléments finis 2D permet une répartition de l’énergie introduite dans le système mécanique entre les deux termes dissipatifs (amortissement matériau et contact), au cours de la réponse transitoire aussi bien en conditions stables qu’instables. En particulier, les vibrations induites par frottement modifient la capacité globale du système à absorber et dissiper l’énergie; une estimation de la puissance dissipée au contact, sans prendre en compte le comportement dynamique du système (flux d’énergie par les vibrations induites par frottement) peut conduire à des erreurs significatives dans la quantification de l’énergie dissipée au contact, ce qui affecte directement plusieurs phénomènes tribologiques. Les mesures expérimentales de crissement montrent comment les mêmes modes instables sont reproduits soit expérimentalement soit numériquement, validant l’utilisation de la simulation 2D transitoires pour l’analyse des vibrations instables induites par le frottement. L’équilibre énergétique a été utilisé sur le modèle à paramétrés concentrés, pour approcher le problème de la surestimation d’instabilité, qui est caractéristique d’une analyse des valeurs propres complexes. Un nouvel indice d’instabilité (MAI) a été défini, par des considérations énergétiques, pour comparer les différents modes instables et pour sélectionner le mode qui devient effectivement instable pendant le crissement
Whenever relative motion between two system components occurs, through a dry contact interface, vibrations are induced by the frictional contact. The local dynamics at the contact (ruptures and wave generation) couples with the system dynamics, giving origin to vibrations and affecting the macroscopic frictional behavior of the system. In this thesis, in order to develop an overall approach to the investigation of the multi-physic phenomenon, the energy has been pointed out as a coupling physical characteristic among the several phenomena at the different scales. The formulation of a mechanical energy balance is used for distinguishing between two different dissipative terms, i.e. the dissipation by material/system damping and the dissipation at the contact. The energy flows coming from the frictional surfaces, by friction induced vibrations, excites the dynamic response of the system, and vice versa the influence of the system dynamic response on the local energy dissipation at the contact interface affects the related tribological phenomena. The friction-induced vibrations have been analyzed using three different approaches: the finite element approach, to investigate the coupling between the contact and system dynamics by the analysis of the energy flows; the experimental approach to validate the numerical results and observe the influence of phenomena not still included into the numerical model; a lumped parameter model approach to quickly investigate the effects of the system parameters. The numerical analysis by the 2D finite element model allowed investigating the repartition of the energy introduced into the mechanical system between the two dissipative terms (material damping and contact) during both stable and unstable friction-induced vibrations. In particular, it has been shown how the friction-induced vibrations modify the overall capacity of the system to absorb and dissipate energy; an estimation of the power dissipated at the contact, without considering the dynamic behavior of the system (energy flows by friction induced vibrations) can lead to significant error in the quantification of the dissipated energy at the contact, which affects directly several tribological phenomena. The experimental squeal measurements show how the same unstable modes are recovered both experimentally and numerically, validating the use of the 2D transient simulations for the reproduction of the unstable friction-induced vibrations. Once the energy balance formulated, it has been used on the lumped model to approach the instability over-prediction issue characteristic of the complex eigenvalue analysis. By energy considerations, a newer instability index (MAI) has been defined to compare the different unstable modes and to select the mode that becomes effectively unstable during the transient response. The Modal Absorption Index allows quantifying the capability of each mode to exchange energy with the external environment

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Mysore, Guruprasad Jr. "Vibration Analysis of Single - Anchor Inflatable Dams." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36846.

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Анотація:

Inflatable dams are flexible, cylindrical structures anchored to a foundation. They are used for a variety of purposes, e.g. diverting water for irrigation or groundwater recharging, impounding water for recreational purposes, and raising the height of existing dams or spillways.

The vibration behavior of such dams is analyzed. Single-anchor inflatable dams with fins are considered. First, a static analysis is performed which yields the equilibrium shapes of the dam, both in the presence and absence of water. Then, a dynamic analysis is undertaken which analyzes the small vibrations of the inflatable dam about the equilibrium configuration, both in the presence of water (hydrostatic water as well as parallel flowing water) and absence of water.

The dam is modeled as an elastic shell. It is assumed to be air-inflated and resting on a rigid foundation. The cross-sectional perimeter, material thickness, modulus of elasticity, and Poisson's ratio are given. The analysis is performed for different values of internal pressure and external water heads.

Initially, the dam is assumed to lie flat. The internal pressure is then increased slowly until it reaches the desired value. Then the external water is applied and the equilibrium configuration is obtained. Small vibrations about this configuration are considered. The water is assumed to be inviscid and incompressible, and potential theory is used. The infinite-frequency limit is assumed on the free surface. A boundary element technique is utilized to determine the behavior of the water, and the finite element program ABAQUS is used to analyze the structural behavior. Both the cases of fluid at rest and flowing parallel to the dam are considered. The vibration frequencies and mode shapes are computed. The effect of the internal pressure of the dam is investigated, and the results are compared to those for the dam in the absence of external water.

Master of Science

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Tonazzi, Davide. "Macroscopic frictional contact scenarios and local contact dynamics : At the origins of “macroscopic stick-slip”, mode coupling instabilities and stable continuous sliding." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0110/document.

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Le comportement local au contact et son interaction avec la dynamique globale du système sont à l'origine d’innombrables problèmes de contact concernant plusieurs disciplines telles que la tribologie, la géophysique, la mécanique de vibration ou la mécanique de la rupture. Lorsque deux corps élastiques sont en mouvement relatif avec une interface de frottement, des vibrations induites se produisent dans le système. Dans un point de vue macroscopique, le scénario macroscopique de stick-slip survenant pendant le mouvement relatif est caractérisé par la chute soudaine de la force de frottement (état de glissement), séparées par des périodes d'accumulation d'énergie élastique (état d’adhérence). Autrement, une instabilité dynamique se produit quand un mode de vibration du système mécanique devient instable en raison des forces de frottement. Ces types d'instabilités, générées par des forces de frottement, ont été principalement objet de publies traitant de problèmes spécifiques dans différents domaines. Dans ce contexte, des analyses expérimentales et numériques ont été ici mis en place pour comprendre comme le comportement de l'interface locale affecte la réponse macroscopique du système et vice-versa, au cours de scénarios d'instabilité. Les scénarios macroscopiques (instabilité de « stick-slip macroscopique », instabilité modale, glissement continu stable), survenant entre deux milieux élastiques simples en mouvement relatif, ont été étudiés numériquement et expérimentalement. Un dispositif expérimental dédié (TRIBOWAVE) a été développé et a permis de reproduire et examiner les différents scénarios de frottement dans des conditions aux limites bien contrôlées. Les mêmes scénarios de frottement ont été reproduits par des simulations numériques transitoires. Une loi de frottement en fonction du temps d’adhérence (stick) a été définie à partir des essais expérimentaux. La loi de frottement obtenue a été mise en œuvre dans le modèle numérique, conduisant à une validation quantitative des scénarios de frottement par les expériences. Les simulations transitoires non linéaires, l’analyse aux valeurs propres complexes et les tests expérimentaux ont permis de dessiner des cartes de scénarios d'instabilité en fonction des paramètres clés du système. Validé par la comparaison avec les mesures des signaux expérimentaux globaux (forces, accélérations / vitesse), le modèle numérique a permis d'étudier le couplage entre le comportement du contact local (distribution de l'état du contact, propagation des ondes et des ruptures, précurseurs) et la réponse dynamique du système au cours du « stick-slip macroscopique », de l’instabilité due au couplage modale et du glissement continu stable. La compréhension du couplage entre le contact et la dynamique des systèmes apportera de nouvelles améliorations sur le contrôle des instabilités de contact et les problèmes d'usure connexes
Local contact behavior and its interaction with the global dynamics of the system are at the origin of innumerable contact issues concerning several different disciplines like tribology, geophysics, vibration mechanics or fracture mechanics. When two elastic media are in relative motion with a frictional interface, friction induced vibrations arise into the system. By a macroscopic point of view, the “macroscopic stick-slip” scenario occurring during relative motion is characterized by sudden friction force drops (sliding state) along the time, separated by periods of elastic energy accumulation (stick state). Instead, the mode dynamic instability occurs when a vibration mode of the mechanical system becomes unstable, due to frictional contact forces. This kind of instabilities, generated by frictional forces, have been mainly object of papers dealing with specific issues in different domains. In this context, experimental and numerical analyses have been focused here on understanding how the local interface behavior affects the macroscopic frictional response of the system, and, conversely, during instability scenarios. The macroscopic frictional scenarios (macroscopic stick-slip instability, mode coupling instability, stable continuous sliding) arising between two simple elastic media in relative motion have been investigated numerically and experimentally. A newer experimental setup (TRIBOWAVE) has been developed and it allowed to reproduce and to investigate the different scenarios under well-controlled boundary conditions. The same frictional scenarios have been reproduced by transient numerical simulations. A dedicated friction law as a function of adherence (sticking) time has been recovered by means of experimental tests. The obtained friction law has been implemented in the numerical model, leading to a quantitative validation of the simulated scenarios by the experiments. Nonlinear transient simulations, complex eigenvalue analyses and experimental tests allowed for drawing instability maps as a function of system key parameters. The numerical model, validated by the comparison with the experimental global measurements (forces, accelerations/velocity), allowed for investigating the coupling between the local contact behavior (contact status distribution, wave and rupture propagation, precursors) and the system dynamic response during macroscopic stick-slip instability, mode coupling instability and stable continuous sliding. The understanding of the coupling between contact and system dynamics will bring to further improvements on the control of contact instabilities and related wear issues

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Bomba, Richard D. "On axial vibration of a web-idle roller system /." Online version of thesis, 1990. http://hdl.handle.net/1850/10606.

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Книги з теми "Contact vibration"

Bosso, Nicola. Mechatronic Modeling of Real-Time Wheel-Rail Contact. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013.

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Veljko, Potkonjak, and Matijevic Vladimir, eds. Dynamics of Robots with Contact Tasks. Dordrecht: Springer Netherlands, 2003.

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Martins, João A. C. Contact Mechanics: Proceedings of the 3rd Contact Mechanics International Symposium, Praia da Consolação, Peniche, Portugal, 17-21 June 2001. Dordrecht: Springer Netherlands, 2002.

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P, Wriggers, and Nackenhorst Udo, eds. Analysis and simulation of contact problems. Berlin: Springer-Verlag, 2006.

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Lewicki, David G. Evaluation of low-noise, improved-bearing-contact spiral bevel gears. [Cleveland, Ohio: NASA Glenn Research Center, 2003.

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Lewicki, David G. Evaluation of low-noise, improved-bearing-contact spiral bevel gears. [Cleveland, Ohio: NASA Glenn Research Center, 2003.

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Lewicki, David G. Evaluation of low-noise, improved-bearing-contact spiral bevel gears. [Cleveland, Ohio: NASA Glenn Research Center, 2003.

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Cook, Robert Manuel. Airfoil Vibration Dampers Program, contract no. NAS8-36720: Final report. [Washington, DC: National Aeronautics and Space Administration, 1991.

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Pfeiffer, F. IUTAM Symposium on Unilateral Multibody Contacts: Proceedings of the IUTAM Symposium held in Munich, Germany, August 3-7, 1998. Dordrecht: Springer Netherlands, 1999.

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Friedrich, Pfeiffer, Wriggers Peter, and SpringerLink (Online service), eds. Numerics of Unilateral Contacts and Friction: Modeling and Numerical Time Integration in Non-Smooth Dynamics. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009.

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Частини книг з теми "Contact vibration"

Moreau, J. J. "Numerical Experiments in Granular Dynamics: Vibration-Induced Size Segregation." In Contact Mechanics, 347–58. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1983-6_47.

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Gloger, M., and M. Jung. "Non-Contact Blade Vibration Information System BeSSI." In Diagnostics of Rotating Machines in Power Plants, 149–65. Vienna: Springer Vienna, 1994. http://dx.doi.org/10.1007/978-3-7091-2706-3_11.

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Huber, Thomas M., Spencer M. Batalden, and William J. Doebler. "Measurement of Vibration Resulting from Non-contact Ultrasound Radiation Force." In Topics in Modal Analysis, Volume 10, 87–92. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15251-6_10.

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Allen, B., C. Harris, and D. Lange. "An Inertially Referenced Non-contact Sensor for Ground Vibration Tests." In Advanced Aerospace Applications, Volume 1, 339–49. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-9302-1_28.

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Munde, Kashinath, and Ganesh Kondhalkar. "Condition Monitoring of Rolling Contact Bearing by Vibration Signature Analysis." In Lecture Notes in Mechanical Engineering, 391–404. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5701-9_32.

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Umakoshi, Keisuke, Tomokazu Matsui, Makoto Yoshida, Hyuckjin Choi, Manato Fujimoto, Hirohiko Suwa, and Keiichi Yasumoto. "Non-contact Person Identification by Piezoelectric-Based Gait Vibration Sensing." In Advanced Information Networking and Applications, 745–57. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-75100-5_63.

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Flamand, L., Ph Sainsot, and D. Berthe. "Analyse Fonctionnelle de la Microgeometrie D’un Contact E.H.D.. Critere D’endommagement en Fatigue Superficielle." In Vibration and Wear in High Speed Rotating Machinery, 815–46. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1914-3_48.

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Nierlich, Wolfgang, and Jürgen Gegner. "Material Response Bearing Testing under Vibration Loading." In Bearing Steel Technologies: 9th Volume, Advances in Rolling Contact Fatigue Strength Testing and Related Substitute Technologies, 329–40. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2012. http://dx.doi.org/10.1520/stp104653.

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Nierlich, Wolfgang, and Jürgen Gegner. "Material Response Bearing Testing under Vibration Loading." In Bearing Steel Technologies: 9th Volume, Advances in Rolling Contact Fatigue Strength Testing and Related Substitute Technologies, 1–12. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2012. http://dx.doi.org/10.1520/stp104653t.

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Natsume, Makiko, Yoshihiro Tanaka, and Akihito Sano. "Individual Differences in Skin Vibration and Contact Force During Active Touch." In Haptics: Perception, Devices, Control, and Applications, 335–45. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42324-1_33.

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Тези доповідей конференцій з теми "Contact vibration"

El Abdi, Rochdi, and Erwann Carvou. "Damage Study of Copper Alloys Submitted to Vibration Tests." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28026.

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The main requirement for the connector materials used in electrical contacts and submitted to vibration mode is to maintain very low and stable electrical resistance. Wear and fretting corrosion are a major cause of connector failure and the main reasons influencing the reliability of the electrical system. If the use of coating materials in electrical contacts is widespread, the coatings disappear from the contact surfaces after a certain number of vibration cycles and the contact is carried out between the two basic substrates in contact at the interface. Our study relates to the contact resistance characterization under dynamic vibrations for a contact between a sphere and plane using high content copper alloys with no coatings. Only one contact part is subjected to a vibratory movement, the other part is fixed. The contact resistance is continuously measured during the test. An experimental study of contact resistance behaviour is undertaken in order to evaluate the influence of mechanical and electrical material properties on the degradation of conduction. The obtained results show that the hardness and the resistivity of the copper alloys used have a large influence on the component lifespan.

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Sepehri, A., and K. Farhang. "Characterization of Contact Damping and Frequency in Elastic-Plastic Contact." In STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71003.

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Elastic-plastic interaction of a block of rough surface with a smooth plane is considered in this paper. The nonlinear normal vibration response of the block is examined when subject to an external compressive load. Free vibration response of the block is studied. The vibration response corresponds to the application of a constant compressive external load and the study yields closed-form equations for the contact damping rate and contact natural frequency. It is shown that vibration decay rate is constant as opposed to the exponential decay rate for the linear vibrating systems. Closed form equations relating contact damping rate and contact natural frequency to the surface parameters are given.

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Yamane, Masami, and Kyosuke Ono. "Study of Contact Bouncing Vibration of Flying Head Slider in Near-Contact Regime." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64263.

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We experimentally and analytically investigated detailed characteristics of the bouncing vibrations of a flying head slider in a near-contact regime. In the experiment, we found that the hysteresis of touch-down and take-off pressure and the rate of instability become small as the pitch angle increases. Moreover, we measured the 3-dimensional slider motion by using two laser Doppler vibrometers simultaneously and found that the bouncing vibration is a coupled vibration between translation and pitch with a small phase shift. These experimental features can be explained analytically if we consider strong shear force due to lubricant and small amount of microwaviness for the previous two-degrees of freedom slider model with nonlinear air bearing stiffness.

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Srivastava, Vanshaj, and Javad Baqersad. "A Non-Contact Technique for Vibration Measurement of Automotive Structures." In Noise and Vibration Conference & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-01-1503.

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Olejnik, Aleksander, Robert Rogolski, and Michal Szczesniak. "Contact and non-contact methods of vibration measurement in aircraft structures." In 2021 IEEE 8th International Workshop on Metrology for AeroSpace (MetroAeroSpace). IEEE, 2021. http://dx.doi.org/10.1109/metroaerospace51421.2021.9511682.

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Zhang, Weiqing, Yawen Wang, Chia-Ching Lin, Teik Lim, Xiaodong Guo, Kan Wang, and Yong Zheng. "Improvement of Hypoid Gears Dynamics Performance Based on Tooth Contact Optimization." In Noise and Vibration Conference & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-01-1563.

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Jemaa, N., and E. Carvou. "Electrical contact behaviour of power connector during fretting vibration." In Electrical Contacts - 2006. 52nd IEEE Holm Conference on Electrical Contacts. IEEE, 2006. http://dx.doi.org/10.1109/holm.2006.284097.

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Sepehri, Ali, and Kambiz Farhang. "Characterization of Contact Damping in Elastic-Plastic Contact of Two Nominally Flat Rough Surfaces." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11912.

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Elastic-plastic interaction of a block of rough surface with a rough plane is considered in this paper. The nonlinear normal vibration response of the block is examined when subject to an external compressive load. Free vibration response of the block is studied. The vibration response corresponds to the application of a constant compressive external load and the study yields closed-form equations for the contact damping rate and contact natural frequency. It is shown that vibration decay rate is constant as opposed to the exponential decay rate for the linear vibrating systems. Closed form equations relating contact damping rate and contact natural frequency to the surface parameters are given.

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Niknam, Alborz, and Kambiz Farhang. "Frictional Instability of a Mass-on-Belt System with Intermittent Contact Detachment." In Noise and Vibration Conference & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-01-1595.

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Sextro, Walter. "Forced Vibration of Elastic Structures With Friction Contacts." In ASME 1999 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/detc99/vib-8180.

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Abstract In many technical contacts energy is dissipated because of dry friction and relative motion. This can be used to reduce the vibration amplitudes. For example, shrouds with friction interfaces are used to reduce the dynamic stresses in turbine blades. The three-dimensional motion of the blades results in a three-dimensional relative motion of the contact planes. The developed Point-Contact-Model is used to calculate the corresponding tangential and normal forces for each contact element. This Point-Contact-Model includes the roughness of the contact surfaces, the normal pressure distribution due to roughness, the stiffness in normal and tangential direction and dry friction. An experiment with two non-Hertzian contacts is used to verify the developed contact model. The comparison between measured and calculated frequency response functions for three-dimensional forced vibrations of the elastic structures shows a very good agreement.

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Звіти організацій з теми "Contact vibration"

Mizrach, Amos, Michal Mazor, Amots Hetzroni, Joseph Grinshpun, Richard Mankin, Dennis Shuman, Nancy Epsky, and Robert Heath. Male Song as a Tool for Trapping Female Medflies. United States Department of Agriculture, December 2002. http://dx.doi.org/10.32747/2002.7586535.bard.

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This interdisciplinaray work combines expertise in engineering and entomology in Israel and the US, to develop an acoustic trap for mate-seeking female medflies. Medflies are among the world's most economically harmful pests, and monitoring and control efforts cost about $800 million each year in Israel and the US. Efficient traps are vitally important tools for medfly quarantine and pest management activities; they are needed for early detection, for predicting dispersal patterns and for estimating medfly abundance within infested regions. Early detection facilitates rapid response to invasions, in order to contain them. Prediction of dispersal patterns facilitates preemptive action, and estimates of the pests' abundance lead to quantification of medfly infestations and control efforts. Although olfactory attractants and traps exist for capturing male and mated female medflies, there are still no satisfactorily efficient means to attract and trap virgin and remating females (a significant and dangerous segment of the population). We proposed to explore the largely ignored mechanism of female attraction to male song that the flies use in courtship. The potential of such an approach is indicated by studies under this project. Our research involved the identification, isolation, and augmentation of the most attractive components of male medfly songs and the use of these components in the design and testing of traps incorporating acoustic lures. The project combined expertise in acoustic engineering and instrumentation, fruit fly behavior, and integrated pest management. The BARD support was provided for 1 year to enable proof-of-concept studies, aimed to determine: 1) whether mate-seeking female medflies are attracted to male songs; and 2) over what distance such attraction works. Male medfly calling song was recorded during courtship. Multiple acoustic components of male song were examined and tested for synergism with substrate vibrations produced by various surfaces, plates and loudspeakers, with natural and artificial sound playbacks. A speaker-funnel system was developed that focused the playback signal to reproduce as closely as possible the near-field spatial characteristics of the sounds produced by individual males. In initial studies, the system was tasted by observing the behavior of females while the speaker system played songs at various intensities. Through morning and early afternoon periods of peak sexual activity, virgin female medflies landed on a sheet of filter paper at the funnel outlet and stayed longer during broadcasting than during the silent part of the cycle. In later studies, females were captured on sticky paper at the funnel outlet. The mean capture rates were 67 and 44%, respectively, during sound emission and silent control periods. The findings confirmed that female trapping was improved if a male calling song was played. The second stage of the research focused on estimating the trapping range. Initial results indicated that the range possibly extended to 70 cm, but additional, verification tests remain to be conducted. Further studies are planned also to consider effects of combining acoustic and pheromonal cues.

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Tire Experimental Characterization Using Contactless Measurement Methods. SAE International, August 2021. http://dx.doi.org/10.4271/2021-01-1114.

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In the frame of automotive Noise Vibration and Harshness (NVH) evaluation, inner cabin noise is among the most important indicators. The main noise contributors can be identified in engine, suspensions, tires, powertrain, brake system, etc. With the advent of E-vehicles and the consequent absence of the Internal Combustion Engine (ICE), tire/road noise has gained more importance, particularly at mid-speed driving and in the spectrum up to 300 Hz. At the state of the art, the identification and characterization of Noise and Vibration sources rely on pointwise sensors (microphones, accelerometers, strain gauges). Optical methods such as Digital Image Correlation (DIC) and Laser Doppler Vibrometer (LDV) have recently received special attention in the NVH field because they can be used to obtain full-field measurements. Moreover, these same techniques could also allow to characterize the tire behavior in operating conditions, which would be practically impossible to derive with standard techniques. In this paper we will demonstrate how non-contact full-field measurement techniques can be used to reliably and robustly characterize the tire behavior up to 300 Hz, focusing on static conditions. Experimental modal analysis will extract the modal characteristic of the tire in both free-free and statically preloaded boundary conditions, using both DIC and LDV. The extracted natural frequencies, damping ratios and full-field mode shapes will be used on one side to improve the accuracy of tire models (either by deriving FRF based models or updating FE ones) but also as a reference for future investigation on the tire behavior characterization in rotating conditions.

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