Готові списки джерел за темами / Vibration

Добірка наукової літератури з теми "Vibration"

Автор: Grafiati
Опубліковано: 4 червня 2021
Оновлено: 8 червня 2024

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Статті в журналах з теми "Vibration":

1

Ryazancev, V., M. Gerasimov, N. Lyubimyy, A. Pol'shin, and A. Tihonov. "PHYSICAL MODEL OF A TWO-STAGE VIBRATION UNIT FOR GENERATING ASYMMETRIC OSCILLATIONS." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 7, no. 10 (June 10, 2022): 107–14. http://dx.doi.org/10.34031/2071-7318-2022-7-10-107-114.

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Vibrating devices occupy a large cluster in the construction and road construction industry. The improvement of all vibration machines begins, first of all, with a vibration device, as the main working body of the machine. Basically, vibrators acted as a vibrating device for all road construction equipment. Initially, vibrators with circular vibrations were used, which are not so effective and not always sufficient for performing special work on driving piles into the ground and also extracting them from the soil. Vibratory systems with asymmetric vibrations are increasingly being used in the construction industry. For example, when driving piles, pile drivers are used. Their principle of operation is similar in its action to the operation of a vibration plant with asymmetric vibrations. However, a vibration plant with asymmetric oscillations, when the direction of the driving force is turned in the opposite direction, not down, but up, also makes it possible to extract worn-out piles and sheet piles from the soil. Based on the above, we propose a description, a method for calculating the optimal values of the asymmetry coefficient, driving force and set out the principle of operation of a physical model of a vibration plant with two stages of generating asymmetric vibrations, consisting of standard vibration equipment: the first stage: a table of the brand EV-341 and the second stage : vibrator of directional vibrations brand IV-99B, manufactured by OOO Yaroslavl Plant Krasny Mayak.
2

Ryazancev, V., M. Gerasimov, and Y. Brazhnik. "REDUCTION OF DIFFERENTLY DIRECTIONAL VIBRATIONS TO ASYMMETRICAL BY CHANGING THE RATIO OF VALUES COMPOSING THE DRIVING FORCE." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 6, no. 5 (May 18, 2021): 87–94. http://dx.doi.org/10.34031/2071-7318-2021-6-5-87-94.

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Vibrating machines play a primary role in the implementation of programs in the construction and road construction kit. The improvement of vibration machines allows to significantly increase the speed of construction and road construction work. The main working unit of a vibrating machine is a vibrating device or vibrator. Currently, in the industry, vibration devices are used with circular or directional, along a certain straight line of vibrations. Further improvement of vibrating machines is carried out in the direction of creating vibration devices with asymmetric vibrations. At present, there are practically no vibrating machines with asymmetric vibrations. These machines allow to distinguish between the "working" process phase and the "idle" phase within each oscillation period. Moreover, the value of the driving force in the phase of performing useful work is several times higher than the value of the driving force in the direction of idling. Therefore, much less work is spent on idling. This allows to get rid of massive elements - overloads that extinguish the magnitude of the driving force in the direction of idling. Therefore, the urgency is to develop a method for converting existing machines with directional vibrations into asymmetric ones, with a given coefficient of asymmetry of the driving force. This makes it possible to reduce the specific indicators of the metal consumption of vibrating machines and the energy consumption of the work performed.
3

Yu, Yingjie, Ying Cao, Qinghui Lai, Qinghui Zhao, Zhexing Sun, Shengwu Zhou, and Dake Song. "Design and Operation Parameters of Vibrating Harvester for Coffea arabica L." Agriculture 13, no. 3 (March 17, 2023): 700. http://dx.doi.org/10.3390/agriculture13030700.

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This study designed a handheld vibrating coffee harvester to improve the mechanized harvesting of Coffea arabica L. The proposed device was used to vibrate branches of Coffea arabica L. trees, and the shedding of coffee fruit and the operation parameters of vibrational harvesting were analyzed. Images captured using high-speed photography were used to derive a force equation that represents the forced vibration of the coffee fruit-stalk joint. In addition, the vibrations of coffee berries and branches were theoretically analyzed, and the results were used to establish a dynamic vibration model of coffee trees. The shedding of coffee berries was primarily affected by the vibration frequency, vibration amplitude, and excitation position, which were simulated using a rigid–flexible branch-machine coupling model on RecurDyn software. Furthermore, field experiments were conducted to determine the optimal working parameters for coffee harvesting using vibrations. The results indicated optimal picking performance when the vibration frequency, vibration amplitude, and excitation position were 62 Hz, 9 mm, and 0.4 L, respectively. The harvesting rates of ripe and unripe coffee were 92.22% and 8.33%, respectively, and the damage rate was 5.23%. Thus, the proposed harvester can satisfactorily achieve the optimal harvesting of Coffea arabica L.
4

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.
5

Bratu, Polidor. "Multibody System with Elastic Connections for Dynamic Modeling of Compactor Vibratory Rollers." Symmetry 12, no. 10 (September 29, 2020): 1617. http://dx.doi.org/10.3390/sym12101617.

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The dynamic model of the system of bodies with elastic connections substantiates the conceptual basis for evaluating the technological vibrations of the compactor roller as well as of the parameters of the vibrations transmitted from the vibration source to the remainder of the equipment components. In essence, the multi-body model with linear elastic connections consists of a body in vertical translational motion for vibrating roller with mass m1, a body with composed motion of vertical translation and rotation around the transverse axis passing through its weight center for the chassis of the car with mass m and the moment of mass inertia J and a body of mass m’ representing the traction tire-wheel system located on the opposite side of the vibrating roller. The study analyzes the stationary motion of the system of bodies that are in vibrational regime as a result of the harmonic excitation of the m mass body, with the force F(t)= m0rω2sinωt, generated by the inertial vibrator located inside the vibrating roller. The vibrator is characterized by the total unbalanced m0 mass in rotational motion at distance r from the axis of rotation and the angular velocity or circular frequency ω.
6

Ni, Cheng-Hua, Yueh-Hsun Lu, Li-Wei Chou, Shu-Fen Kuo, Chia-Huei Lin, Shang-Lin Chiang, Liang-Hsuan Lu, Xin-Miao Wang, Jia-Lan Chang, and Chueh-Ho Lin. "Analysis of Vibration Frequency and Direction for Facilitating Upper-Limb Muscle Activity." Biology 12, no. 1 (December 27, 2022): 48. http://dx.doi.org/10.3390/biology12010048.

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We aimed to determine the effect of vibration frequency and direction on upper-limb muscle activation using a handheld vibrator. We recruited 19 healthy participants who were instructed to hold a handheld vibrator in their dominant hand and maintain the elbow at 90° flexion, while vertical and horizontal vibrations were applied with frequencies of 15, 30, 45, and 60 Hz for 60 s each. Surface electromyography (EMG) measured the activities of the flexor digitorum superficialis (FDS), flexor carpi radialis (FCR), extensor carpi ulnaris (ECU), extensor carpi radialis (ECR), biceps, triceps, and deltoid anterior muscles. EMG changes were evaluated as the difference in muscle activity between vibration and no-vibration (0 Hz) conditions. Muscle activity was induced under vibration conditions in both vertical and horizontal (p < 0.05) directions. At 45 Hz, FDS and FCR activities increased during horizontal vibrations, compared with those during vertical vibrations. ECU activity significantly increased under 15-Hz vertical vibrations compared with that during horizontal vibrations. Vibrations from the handheld vibrator significantly induced upper-limb muscle activity. The maximum muscle activations for FDS, ECR, ECU, biceps, and triceps were induced by 45-Hz horizontal vibration. The 60-Hz vertical and 30-Hz horizontal vibrations facilitated maximum muscle activations for the FCR and deltoid anterior, respectively.
7

Lian, Jijian, Yan Zheng, Chao Liang, and Bin Ma. "Analysis for the Vibration Mechanism of the Spillway Guide Wall Considering the Associated-Forced Coupled Vibration." Applied Sciences 9, no. 12 (June 25, 2019): 2572. http://dx.doi.org/10.3390/app9122572.

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During the flood discharge in large-scale hydraulic engineering projects, intense flow-induced vibrations may occur in hydraulic gates, gate piers, spillway guide walls, etc. Furthermore, the vibration mechanism is complicated. For the spillway guide wall, existing studies on the vibration mechanism usually focus on the vibrations caused by flow excitations, without considering the influence of dam vibration. According to prototype tests, the vibrations of the spillway guide wall and the dam show synchronization. Thus, this paper presents a new vibration mechanism of associated-forced coupled vibration (AFCV) for the spillway guide wall to investigate the dynamic responses and reveal coupled vibrational properties and vibrational correlations. Different from conventional flow-induced vibration theory, this paper considers the spillway guide wall as a lightweight accessory structure connected to a large-scale primary structure. A corresponding simplified theoretical model for the AFCV system is established, with theoretical derivations given. Then, several vibrational signals measured in different structures in prototype tests are handled by the cross-wavelet transform (XWS) to reveal the vibrational correlation between the spillway guide wall and the dam. Afterwards, mutual analyses of numeral simulation, theoretical derivation, and prototype data are employed to clarify the vibration mechanism of a spillway guide wall. The proposed mechanism can give more reasonable and accurate results regarding the dynamic response and amplitude coefficient of the guide wall. Moreover, by changing the parameters in the theoretical model through practical measures, the proposed vibration mechanism can provide benefits to vibration control and structural design.
8

Fardelin, Gustav, Niklas Ricklund, and Ing-Liss Bryngelsson. "Hand nerve function after mountain bike cycling." Journal of Science and Cycling 11, no. 3 (December 31, 2022): 23–32. http://dx.doi.org/10.28985/1322.jsc.10.

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Hand-arm vibrations can cause permanent injuries and temporary changes affecting the sensory and circulatory systems in the hands. Vibrational effects have been thoroughly studied within the occupational context concerning work with handheld vibrating tools. Less is known about vibrational exposure and risk of effects during cycling. In the present study, 10 cyclists were recruited for exposure measurements of hand-arm vibrations during mountain bike cycling on the trail, and the effects on the nerve function were examined with quantitative sensory testing (QST) before and after the ride. The intervention group was compared to a control group that consisted of men exposed to hand-arm vibrations from a polishing machine. The results of the QST did not statistically significantly differ between the intervention and study groups. The intervention group showed a lesser decrease in vibration perception in digitorum II, digitorum V, and hand grip strength than the control group. It was concluded that no acute effects on nerve function in the dominant hand were measured after mountain bike cycling on the trail, despite high vibration doses through the handlebars.
9

Niu, Jianye, Jiang Wu, Qiming Liu, Li Chen, and Shijie Guo. "A Dumbbell Shaped Piezoelectric Motor Driven by the First-Order Torsional and the First-Order Flexural Vibrations." Actuators 9, no. 4 (November 30, 2020): 124. http://dx.doi.org/10.3390/act9040124.

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A piezoelectric motor driven by the first-order torsional and first-order flexural (T/F) vibrations is designed, fabricated, and tested in this study. The actuating force is generated by the torsional vibration of the dumbbell-shaped vibrator, while the elliptical motion shape is adjusted with the flexural vibration. The rotor, pressed onto the vibrator’s lateral surface, is frictionally driven with the vibrator. Here, the torsional vibration, the shear modes of piezoelectric ceramics, and the driving method may contribute to high torque and high output power. To test the feasibility of our proposal, first, a prototype of the T/F vibrator is built and its vibration properties are explored. As predicted, the torsional and flexural vibrations are excited on the vibrator. Then, the load characteristics of the piezoelectric motor are investigated. The maximal torque, the no-load rotation speed, and maximal output power are 4.3 Nm, 125 r/min, and 16.9 W, respectively. The results imply that using the first-order torsional and the first-order flexural vibrations is a feasible method to achieve high torque and high output power of piezoelectric motors.
10

Yin, Zhen, Hua Li, Bang Fu Wang, and Ke Feng Song. "Study on the Design of Longitudinal-Torsional Composite Ultrasonic Elliptical Vibrator Based on FEM." Advanced Materials Research 308-310 (August 2011): 341–45. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.341.

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Based on FEM, a new type of ultrasonic elliptic vibrator design method was proposed, the ultrasonic elliptic vibration was achieved by the structural curve of the longitudinal and torsional vibrations. The impedance and vibration characteristics of the new longitudinal-torsional composite ultrasonic elliptic vibrator prototype were tested. It provides an important basis for impedance matching and longitudinal-torsional composite ultrasonic elliptical vibration application.
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Статті в журналах Дисертації Книги

Дисертації з теми "Vibration":

1

Zethson, Alexander. "Vibration." Thesis, Kungl. Musikhögskolan, Institutionen för jazz, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kmh:diva-950.

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2

Kumar, Ashok. "Active structural-acoustic control of interior noise in vibro-acoustic cavities." Thesis, IIT Delhi, 2016. http://localhost:8080/iit/handle/2074/7036.

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3

Kornienko, N. E., and A. P. Naumenko. "Strong Vibration-Electron Interactions and Vibration Band Enhancement in Vibrational Spectra of C60 Nanofilms and Singlewalled Carbon Nanotubes." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35593.

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In Raman spectra in nanofilms of fullerene C60 with thickness about 150 – 250 nm it was found the en-hancement of vibrational bands Hg (1 ÷ 8) intensity at 2 ÷ 7 times in comparison with the microfilms with thickness 1 – 2 microns. It is shown that the inactive for icosahedral symmetry Ih Raman and IR vibrations Gg, u, Hu, F2g, u, and the lateral spectral components of the bands Hg (1 ÷ 8) increase in 5 – 50 times and more. This is due to an abnormal increasing of the resonant nonlinear interaction of the vibrational modes and the vibrational-electronic interaction, which leads to a change in the electronic states and the appear-ing of new electronic bands (EB) in the region of the vibrations. The change induced by the polymerization of EB in nanofilms C60 and intense laser pulses have been studied. . A nonmonotonic dependence of the EP intensity on the thickness of nanofilms has been established. The lineshape of the overtones 2Ag (2) and 2Hg (7) for fullerene C60 and increasing of overtone 2D in spectra of single-walled carbon nanotubes, as well as unusual changes anharmonisity their 2G and 2D bands varies with the frequency of the laser radi-ation have been studied. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35593
4

Trimble, A. Zachary. "Downhole vibration sensing by vibration energy harvesting." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/39891.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.
Includes bibliographical references (p. 117).
This thesis outlines the design of a prototype electromagnetic induction vibration energy harvesting device for use in a downhole environment. First order models of the necessary components for a generic vibration energy harvester are presented and used to predict the most sensitive parameters for the design of energy harvesting systems. A subset of the design tools created in MATLAB and Excel for vibration energy harvester design and first order optimization is introduced and used to aid in the design of an energy harvester specific to the downhole environment. The manufacture of a prototype design is documented and recommendations for future manufacturing processes are given. The prototype is then tested against the models. Based on the results, final conclusions and recommendations for future refinements are made, and other applications are suggested.
by A. Zachary Trimble.
S.M.
5

Shatov, MY, SV Joubert, CE Coetzee, and IA Fedotoc. "Free vibration of rotating hollow spheres containing acoustic media." Elsevier, 2008. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001765.

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Abstract When avibratingstructureisrotatedwithrespecttoinertialspace,thevibratingpatternrotatesatarateproportionalto the inertialrateofrotation.Bryanfirstobservedthiseffectin1890.Theeffect,calledBryan’seffectinthesequel,has numerous navigationalapplicationsandcouldbeusefulinunderstandingthedynamicsofpulsatingstarsandearthquake series inastrophysicsandseismology.Bryan’sfactor(thecoefficientofproportionalitybetweentheinertialandvibrating pattern rotationrates)dependsonthegeometryofthestructureandthevibrationmodenumber.The‘‘gyroscopiceffects’’ of ahollowisotropicsolidspherefilledwithaninviscidacousticmediumareconsideredhere,butthetheoryisreadily adapted toahollowisotropicsolidcylinderfilledwithaninviscidacousticmedium.Alineartheoryisdevelopedassuming, among othermildconditions,thattherotationrateisconstantandmuchsmallerthanthelowesteigenfrequencyofthe vibrating system.Thuscentrifugalforcesareconsideredtobenegligible.Beforecalculatingsolutionsforthedisplacement of aparticleintheisotropic,spherical,distributedbody,Bryan’sfactorisinterpretedusingacomplexfunction.Hereitis demonstrated thatneitherBryan’seffectnorBryan’sfactorisinfluencedbyincludinglight,isotropic,viscousdampingin the mathematicalmodel.Hencedampingisneglectedinthesequel.Twoscenariosarethenidentified.Firstly,wemay assume thattheacousticmediumiscompletelyinvolvedintherotation(thespheroidalmode).Secondly,wemayassume that theacousticmediumremainsstaticwithrespecttotheinertialreferenceframe(thetorsionalmode).Weinvestigatethe spheroidal modeusinganumericalexperimentthatcomparestherotationalangularrateofasphere(filledwithaninviscid acoustic medium)withthoseofitsvibratingpatternsatbothhighandlowvibrationfrequency.
6

Körning, Ljungberg Jessica. "Psychological responses to noise and vibration /." Umeå : Umeå universitet : Arbetslivsinstitutet, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-915.

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7

Labbé, Julien. "Détection et étude de micro-déplacements des contacts sous contrainte vibratoire et leurs conséquences sur les matériaux et revêtements des connecteurs-automobiles." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S146/document.

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Les vibrations issues du fonctionnement d'un véhicule automobile (moteur, route) sont transmises aux connecteurs électriques. Ces vibrations peuvent induire des déplacements relatifs entre certains des composants du connecteur à l’interface de contact. Les éléments en contact sont de diverses formes et diverses natures dont une partie femelle (dite clip) dans laquelle s’introduit une partie mâle (dite languette). Or, un déplacement relatif de quelques micromètres entre le clip et la languette est suffisant pour dégrader et ce de manière irréversible, l'interface de la zone de contact électrique (phénomène de fretting-corrosion). Il est donc nécessaire de connaître le comportement vibratoire interne d'un connecteur i.e. des connectiques pour préconiser sa meilleure son utilisation au sein d'un véhicule. Un banc d'essai sur pot vibrant a été réalisé dans le but de caractériser le comportement vibratoire d'un connecteur soumis à un profil vibratoire. Les mesures ont été réalisées par tribométrie en réalisant des orifices d'accès au clip et à la languette. De là, l'analyse des vibrations induites a mis en évidence des directions de déplacement multi-axiales des composants du connecteur et notamment celles d’un support du clip dit porte-clip, et ce malgré une vibration dont la direction est mono-axiale. L'analyse a également mis en évidence une correspondance vibratoire entre le clip et le porte-clip ainsi que des phénomènes de résonances. De là, une première approche sur une modélisation numérique, basée sur un système masse-ressort-amortisseur, a été proposée. Cette analyse permet de caractériser le comportement vibratoire général d'un connecteur sans dépendre du type de vibration appliquée. C'est une nouvelle approche dans la caractérisation de connecteurs électriques utilisés dans l’industrie automobile. Les éléments en contact d’un connecteur sont revêtus de matériaux qui les protègent des dégradations mécaniques et chimiques. Ces revêtements (de quelques micromètres d’épaisseur) peuvent être des matériaux nobles (or, argent,…) ou non nobles (étain, …). Le déplacement relatif entre un clip étamé et une languette étamée engendre la formation d'un troisième corps à l'interface de contact. Ce troisième corps est composé de débris oxydés qui perturbent la conduction des charges électriques. L'utilisation d'une atmosphère de di-azote (N2) et l’analyse de la tension de contact en fonction de l'emplacement du clip par rapport à la languette ont mis en évidence la dynamique des débris oxydés avec notamment leur évacuation hors de la zone de contact. De plus, l'analyse d'une zone de contact dégradée à la microsonde nucléaire a permis de doser l'oxygène et de mettre en valeur deux types d'oxydes de cuivre. Ces caractérisations permettent de mieux comprendre le phénomène de fretting-corrosion et ses conséquences
Vibrations are generating from an operating vehicule (motor, road). Then, they are transmitted to electrical connectors. Therefor, these vibrations can induce relative displacements between some of the connector components. The components for the electrical contact are the female part (called a clip) and the male part (called the tongue).These components are coated with materials that protect them from mechanical and chemical degradation. These coatings (a few micrometers thick) can be noble materials (gold, silver,...) or not noble (tin). A relative displacement of a few micrometers between the clip and the tongue is sufficient to irreversibly degrade the interface of the electrical contact zone by fretting-corrosion phenomenon. It is therefore necessary to know the internal vibratory behavior of connectors in order to recommend its best use for a vehicle.A test bench is carried out in order to characterize the vibratory behavior of a connector subjected to a vibratory profile. The measurements are carried out by vibrometry by making holes access for the clip and the tongue. From there, the analysis of the induced vibrations has revealed multi-axial directions displacements of the components of the connector and in particulary the clip holder (external support of the clip), despite a vibration whose direction is mono-axial.The analysis also showed a vibratory correspondence between the clip and the clip holder and resonance phenomena. From there, a first approach on a numerical modeling, based on a system mass-spring-damper, has been proposed. This analysis makes it possible to characterize the general vibratory behavior of a connector without depending on the type of vibration applied. This is a new approach in the characterization of electrical connectors used in the automotive industry.The relative movement between the clip and the tongue induce formation of a third body at the contact interface. This third body is composed of tin oxidized remains which disturb the conduction of electrical charges due to their electrcail insulating characteristic. The use of a nitrogen atmosphere and the analysis of the contact voltage as a function of the location of the clip relative to the tongue have demonstrated the dynamics of the oxidized debris with, in particular, their evacuation out of the contact area. Moreover, the analysis by a nuclear microprobe of a zone degraded contact area enable the measurement of oxygen concentration. The results hilight two types of copper oxides. These characterizations make it possible to better understand the phenomenon of fretting-corrosion and its consequences
8

Sidbury, Jenny Elizabeth. "Analysis of Buckled and Pre-bent Columns Used as Vibration Isolators." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/9641.

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Vibrations resulting from earthquakes, machinery, or unanticipated shocks may be very damaging and costly to structures. To avoid such damage, designers need a structural system that can dissipate the energy caused by these vibrations. Using elastically buckled struts may be a viable means to reduce the harmful effects of unexpected vibrations. Post-buckled struts can support high axial loads and also act as springs in a passive vibration isolation system by absorbing or dissipating the energy caused by external excitation. When a base excitation is applied, the buckled strut may act to reduce the dynamic force transmitted to the system, thus reducing the structural damage to the system. Several models of buckled and pre-bent struts are examined with different combinations of parameters and end conditions. The models include pinned or fixed columns supporting loads above their buckling load, and columns with an initial curvature supporting various loads. The varying parameters include external damping, internal damping, and stiffness. The columns will be subjected to simple harmonic motion applied at the base or to a multi-frequency base excitation. The response of each model is measured by the deflection transmissibility of the supported load over a large range of frequencies. Effective models reduce the motion of the supported load over a large range of frequencies.
Master of Science
9

Korneliusson, Marie, and Pernilla Lindell. "Vibration/accelerationsträning." Thesis, Halmstad University, School of Business and Engineering (SET), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-1120.

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Studien hade ett primärt och ett sekundärt syfte. Primära syftet var att genomföra en empirisk studie gällande vibration/accelerationsträning och undersöka om vibration/accelerationsträning påverkar styrka och balans. Sekundära syftet var att utföra en litteraturstudie och utvärdera positiva, negativa och uteblivna effekter av vibration/accelerationsträning.

I studien deltog från start av studien 16 stycken kvinnor med en medelålder på 45 år, varav tre stycken kvinnor fullföljde studien. Testpersonerna tränade tre gånger i veckan under åtta veckor. Träningsprogrammet som utfördes innehöll 14 stycken övningar och tog cirka 20 minuter att genomföra. Ett styrketest och ett balanstest utfördes före träningsperioden, efter fyra veckor och efter åtta veckors träning. Det utfördes mätningar på biceps-, lår-, midje- och stussomfång utfördes, samt vägning. Testpersonerna svarade även på en enkät före träningsperioden och en enkät efter avslutad träningsperiod.

Testpersonerna var 16 stycken vid första testtillfället. Vid andra testtillfället var endast tre stycken testpersoner kvar, vilka även genomförde hela studien. Resultaten för testperson ett var viktminskning och inga signifikanta förändringar på mätvärdena gällande biceps, midja, stuss och lår. Balans och styrkevärdena förbättrades på båda benen. Testperson två fick en liten viktökning, inga signifikanta förändringar i mätvärdena gällande biceps, stuss och lår. En signifikant minskning av midjeomfånget. Balansen försämrades signifikant medan styrkan förbättrades. Resultaten för testperson tre var en liten viktminskning, inga signifikanta förändringar i mätvärdena. Inga signifikanta förändringar gällande balans och styrka.

Vibration/accelerationsträning uppfyller idag inte alla krav som styrketräning innebär. Effekterna är inte helt klarlagda och kräver fler studier. Framtida studier som kommer att utföras på vibration/accelerationsträningen bör ha likvärdiga gruppsammansättningar vid jämförelser mellan olika träningsmetoder eller utvärdera effekterna endast från vibration/accelerationsträningen, för att få rättvisande testresultat. Viktigast är att utvärdera enskild individ.

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Bury, A. S. "Torsional vibration." Thesis, Видавництво СумДУ, 2012. http://essuir.sumdu.edu.ua/handle/123456789/26042.

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Анотація:
Torsional vibration can be broadly described as the angular vibration of any object as a result of applied torque. It can be defined specifically as the periodic motion corresponding to a shaft, where the shaft is twisted about its axis, alternating from one direction to the other. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/26042
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Книги з теми "Vibration":

1

Kelly, S. Graham. Advanced vibration analysis. Boca Raton, FL: CRC/Taylor & Francis, 2007.

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2

Flower, Alison Fiona. Noise and vibration of vibrating conveyors. Birmingham: University of Birmingham, 1998.

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Kelly, Samuel Graham. Mechanical vibrations: Theory and applications, SI. [Stamford]: Cengage Learning, 2012.

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4

Vorus, William S. Vibration. Jersey City, N.J: Society of Naval Architects and Marine Engineers, 2010.

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Vorus, William S. Vibration. Jersey City, N.J: Society of Naval Architects and Marine Engineers, 2010.

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6

Simon, Braun, Ewins D. J, and Rao S. S, eds. Encyclopedia of vibration. San Diego: Academic Press, 2002.

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7

Conference on Mechanical Vibration and Noise (11th 1987 Boston, Mass.). Vibration control and active vibration suppression. New York, N.Y. (345 E. 47th St., New York 10017): American Society of Mechanical Engineers, 1987.

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8

Rittweger, Jörn, ed. Manual of Vibration Exercise and Vibration Therapy. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-43985-9.

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9

Vuolio, Raimo. Blast vibration: Threshold values and vibration control. Helsinki: Finnish Academy of Technology, 1990.

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Buzdugan, Gh. Vibration measurement. Dordrecht: M. Nijhoff Publishers, 1986.

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Частини книг з теми "Vibration":

1

Hagedorn, P. "Mechanical Vibrations and Vibration Control." In Passive and Active Structural Vibration Control in Civil Engineering, 1–78. Vienna: Springer Vienna, 1994. http://dx.doi.org/10.1007/978-3-7091-3012-4_1.

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2

Seitz, Andreas, Florian Liebgott, Dominik Rotter, Daniel Kessler, and Hans-Peter Beise. "Enabling Single-Sensor Simultaneous Condition Monitoring of Several Vibration-Emitting Machine Parts Using Neural Networks." In Advances in Automotive Production Technology – Towards Software-Defined Manufacturing and Resilient Supply Chains, 179–89. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27933-1_17.

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AbstractIn production environments, monitoring the vibration of a machine or parts thereof can yield important information about the condition of the machine. The most common recommendation for vibration-based condition monitoring is to place a vibration sensor on each part of interest. These vibration sensors usually output preprocessed data, for example the root mean square value of a predefined time window.We propose to use machine learning to simultaneously monitor several vibration-emitting machine parts using only one single vibration sensor. Due to the superposition of multiple vibrations, this is not feasible using preprocessed sensor data. Our approach therefore consists of a one-dimensional convolutional neural network, which uses the raw vibration signal as input to classify the status of the monitored machine parts.As a first proof of concept, we monitored the status of three different motors. Using our approach, we were able to detect, which motors were running at a given time with high accuracy. We were able to significantly improve the classification results by transforming the raw data into the frequency domain. Our results are promising and show, that monitoring several vibration-emitting machine parts at the same time using only one vibration sensor is feasible.
3

Moore, C. Bradley. "Vibration→Vibration Energy Transfer." In Advances in Chemical Physics, 41–83. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470143735.ch2.

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Foreman, John E. K. "Vibration and Vibration Control." In Sound Analysis and Noise Control, 164–90. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-6677-5_6.

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5

Bährle-Rapp, Marina. "Vibration." In Springer Lexikon Kosmetik und Körperpflege, 582. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_11029.

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6

Shamoto, Eiji, and Burak Sencer. "Vibration." In CIRP Encyclopedia of Production Engineering, 1–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-642-35950-7_6547-4.

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Drabble, G. E. "Vibration." In Work Out Dynamics, 274–316. London: Macmillan Education UK, 1987. http://dx.doi.org/10.1007/978-1-349-08864-5_7.

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Wasserman, Donald E. "Vibration." In Hamilton & Hardy's Industrial Toxicology, 1099–114. Hoboken, New Jersey: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781118834015.ch103.

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Shamoto, Eiji, and Burak Sencer. "Vibration." In CIRP Encyclopedia of Production Engineering, 1791–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-53120-4_6547.

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Billingsley, John. "Vibration." In Essentials of Dynamics and Vibrations, 99–119. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56517-0_11.

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Тези доповідей конференцій з теми "Vibration":

1

Minaev, Andrey. "INNOVATIVE TECHNOLOGIES IN SPORTS VIBRATION BIOMECHANICS." In VII All-Russian scientific and practical conference with international participation "Sports Informatics Day". Russian Association of Computer Science in Sports, 2024. http://dx.doi.org/10.62105/2949-6349-2024-1-s1-57-60.

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IIn all sports, where a successful result is achieved by obtaining high projectile speeds when interacting with an athlete, shock and vibration loads occur. The study of issues arising in the vibrational biomechanics of sports equipment will always be an urgent and in-demand area in sports scientific engineering. Based on high innovative technologies, including those related to the processes of transmission, analysis and evaluation of information using computer technology, it is convenient to obtain the vibration characteristics of projectiles in various situations using test benches. Shock, vibration stands, as well as field tests for recording dynamic characteristics (bending, torsional vibrations) of various models of sports equipment will be constantly improved. On laboratory test benches, both the velocity of the projectile and the rate of damping of the resulting vibrations are determined, the analysis of vibration attenuation decrements and other dynamic characteristics affecting the quality of the sports projectile and having a significant impact on the result obtained by the athlete. The analysis of information data records obtained from vibration sensors with the construction of amplitude-frequency characteristics, based on the test results, allows us to determine both the most high-speed sports equipment, both a biomechanical system, and a projectile with reduced vibrations and the best vibration damping properties. Information, digital and all other technologies, including those related to the development of innovative composite materials, continue to develop, the study of vibrational biomechanics of sports equipment will also continue to develop and play an important role in the development of increasingly advanced sports equipment that will further push the boundaries of human capabilities.
2

Sun, Feng, Zu Bin Chen, and Jun Lin. "Vibration Controller of Marine Electromagnetic Vibrator." In 2009 International Conference on Measuring Technology and Mechatronics Automation. IEEE, 2009. http://dx.doi.org/10.1109/icmtma.2009.491.

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3

Ishida, Yukio, Tsuyoshi Inoue, Taishi Kagawa, and Motohiko Ueda. "Torsional Vibration Suppression by a Centrifugal Pendulum Vibration Absorber." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84648.

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Driving torque of rotating machinery, such as automobile engines, changes periodically. As a result, torsional vibrations occur and cause serious noise and vibration problems. In this study, the dynamic characteristics of centrifugal pendulum vibration absorbers restraining torsional vibration is investigated both theoretically and experimentally. In the theoretical analysis, the nonlinear characteristics are taken into consideration under the assumption of large amplitude vibration of pendulum. It is clarified that the centrifugal pendulum, although it has remarkable effects on suppressing harmonic vibration, induces large amplitude harmonic vibrations, the second and third superharmonic resonances, and unstable vibrations of harmonic type. We propose various methods to suppress these secondarily induced vibration and show that it is possible to suppress torsional vibrations to substancially zero amplitude in all through the rotational speed range.
4

Choura, Slim A. "Vibration Confinement in a Flexible Truss-Structure." In ASME 1996 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/imece1996-0907.

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Abstract In this paper, the vibration of a flexible truss-structure, described as a finite element model, is confined and suppressed simultaneously using feedback. The structure is assumed to possess regions that are sensitive to vibrations. The control objective is concerned with the isolation of the sensitive regions from vibrational amplitudes. This necessitates the employment of point force actuators for altering the eigenvalues and mode shapes of the structure. The modified eigenstructure of the system allows the confinement of vibration away from the sensitive regions. In order to avoid build-up of vibrational amplitudes during the confinement process, the proposed feedback contains a mechanism for vibration suppression. In addition, the proposed control strategy demonstrates that the vibrational amplitudes associated with the sensitive regions are brought faster to rest as opposed to those associated with the remaining regions of the structure. We show that the confinement-suppression of structural vibration is possible with a reduced amount of actuators whose number is less or equal to the dimension of the structure model.
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Yazdanniyaz, Amir, Anders Carlson, Sean Bui, Catherine Wenger, and Aimee Lalime. "Design of Vibration-Sensitive Laboratory Floors: Vibration Criteria and Prediction Methods Compared with Measured Vibrations." In Architectural Engineering Conference (AEI) 2003. Reston, VA: American Society of Civil Engineers, 2003. http://dx.doi.org/10.1061/40699(2003)4.

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Shardakov, I., I. Glot, A. Shestakov, and D. Gubskiy. "Vibration protection of devices sensitive to angular vibrations." In PROCEEDINGS OF THE X ALL-RUSSIAN CONFERENCE “Actual Problems of Applied Mathematics and Mechanics” with International Participation, Dedicated to the Memory of Academician A.F. Sidorov and 100th Anniversary of UrFU: AFSID-2020. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0035564.

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Bin Tahir, Ammaar, Oleg Shiryayev, Hamad Karki, and Nader Vahdati. "Nonlinear Vibration Absorber for Mitigation of Torsional Vibrations." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86715.

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This work discusses the effects of utilizing a nonlinear energy absorber with linear and cubic stiffness characteristic in mitigating torsional vibrations in a 5 degrees-of-freedom (5-DOF) rotational system. Results comparing the effects of adding a linear TMD in the system with those obtained by adding an NES are presented which demonstrate the usefulness of an NES over a conventional TMD. Subsequently, a simpler translational system comprising of an NES is considered and an optimization-based tuning methodology is used in order to tune the NES for maximum dissipation of vibration energy. The results are compared with those obtained for the system with a linear absorber.
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Jiang, Rong-Jun, and Shi-Jian Zhu. "Vibration Isolation and Chaotic Vibration." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/vib-48589.

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Taking single degree of freedom vibration isolation system under simple harmonic excitation as an example, and considering the energy, the vibration isolation performance in different conditions was studied theoretically and numerically. The results shows that when the simple harmonic excitation import energy is definite, the vibration isolation performance at the primary harmonic frequency of the nonlinear vibration isolation system is better than that of the linear system, and the vibration isolation performance of the nonlinear vibration isolation system in chaotic vibration state is much better than that in non-chaotic vibration state. For the same isolated object, if can let the vibration isolation system vibrate chaotically, the system will possess the best isolation performance at the primary frequency.
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Rivin, Eugene I. "Vibration Analysis vs. Vibration Control." In SAE 2005 Noise and Vibration Conference and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2005. http://dx.doi.org/10.4271/2005-01-2548.

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Ufimtsev, E. K., A. E. Manushin, and N. A. Chemezov. "Validating vibrations of the vibration table in the presence and absence of a dynamic vibration damper." In XLIII ACADEMIC SPACE CONFERENCE: dedicated to the memory of academician S.P. Korolev and other outstanding Russian scientists – Pioneers of space exploration. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5133334.

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Звіти організацій з теми "Vibration":

1

Hart, Carl. Vibration survey of Room 47 with a laser doppler vibrometer : Main Laboratory Basement, U.S. Army ERDC-CRREL. Engineer Research and Development Center (U.S.), November 2020. http://dx.doi.org/10.21079/11681/38919.

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Plans are underway to create an acousto-optic laboratory on the campus of the Cold Regions Research and Engineering Laboratory. For this purpose, existing space in the basement of the Main Laboratory will be renovated. Demanding measurement techniques, such as interferometry, require a sufficiently quiet vibration environment (i.e., low vibration levels). As such, characterization of existing vibration conditions is necessary to determine vibration isolation requirements so that highly sensitive measurement activities are feasible. To this end, existing vibro-acoustic conditions were briefly surveyed in Room 47, a part of the future laboratory. The survey measured ambient noise and ambient vertical floor vibrations. The ambient vibration environment was characterized according to generic velocity criteria (VC), which are one-third octave band vibration limits. At the time of the survey, the ambient vibration environment fell under a VC-A designation, where the tolerance limit is 2000 μin/s across all one-third octave bands. Under this condition, highly sensitive measurement activities are feasible on a vibration-isolated working surface. The conclusion of this report provides isolation efficiency requirements that satisfy VC-E limits (125 μin/s), which are necessary for interferometric measurements.
2

Rahman, Shahedur, Rodrigo Salgado, Monica Prezzi, and Peter J. Becker. Improvement of Stiffness and Strength of Backfill Soils Through Optimization of Compaction Procedures and Specifications. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317134.

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Vibration compaction is the most effective way of compacting coarse-grained materials. The effects of vibration frequency and amplitude on the compaction density of different backfill materials commonly used by INDOT (No. 4 natural sand, No. 24 stone sand, and No. 5, No. 8, No. 43 aggregates) were studied in this research. The test materials were characterized based on the particle sizes and morphology parameters using digital image analysis technique. Small-scale laboratory compaction tests were carried out with variable frequency and amplitude of vibrations using vibratory hammer and vibratory table. The results show an increase in density with the increase in amplitude and frequency of vibration. However, the increase in density with the increase in amplitude of vibration is more pronounced for the coarse aggregates than for the sands. A comparison of the maximum dry densities of different test materials shows that the dry densities obtained after compaction using the vibratory hammer are greater than those obtained after compaction using the vibratory table when both tools were used at the highest amplitude and frequency of vibration available. Large-scale vibratory roller compaction tests were performed in the field for No. 30 backfill soil to observe the effect of vibration frequency and number of passes on the compaction density. Accelerometer sensors were attached to the roller drum (Caterpillar, model CS56B) to measure the frequency of vibration for the two different vibration settings available to the roller. For this roller and soil tested, the results show that the higher vibration setting is more effective. Direct shear tests and direct interface shear tests were performed to study the impact of particle characteristics of the coarse-grained backfill materials on interface shear resistance. The more angular the particles, the greater the shear resistance measured in the direct shear tests. A unique relationship was found between the normalized surface roughness and the ratio of critical-state interface friction angle between sand-gravel mixture with steel to the internal critical-state friction angle of the sand-gravel mixture.
3

Brangham, D., and K. Olson. Vibration Mitigation System. Office of Scientific and Technical Information (OSTI), September 2020. http://dx.doi.org/10.2172/1661032.

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4

Yoshikawa, Shoko, and S. K. Kurtz. Passive Vibration Damping Materials: Piezoelectric Ceramics Composites for Vibration Damping Applications. Fort Belvoir, VA: Defense Technical Information Center, February 1993. http://dx.doi.org/10.21236/ada260792.

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Yoshikawa, Shoko, R. Meyer, J. Witham, S. Y. Agadda, and G. Lesieutre. Passive Vibration Damping Materials: Piezoelectric Ceramic Composites for Vibration Damping Applications. Fort Belvoir, VA: Defense Technical Information Center, August 1995. http://dx.doi.org/10.21236/ada298477.

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Chen, S. S. Flow-induced vibration: 1992. Office of Scientific and Technical Information (OSTI), September 1992. http://dx.doi.org/10.2172/10103206.

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Noble, C. R., and Hoehler, M.S., S.C. Sommer. NIF Ambient Vibration Measurements. Office of Scientific and Technical Information (OSTI), November 1999. http://dx.doi.org/10.2172/802614.

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Chen, S. S. Flow-induced vibration: 1992. Office of Scientific and Technical Information (OSTI), September 1992. http://dx.doi.org/10.2172/7005247.

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Troksa, M. Vibration Assisted Powder Deposition. Office of Scientific and Technical Information (OSTI), September 2019. http://dx.doi.org/10.2172/1561451.

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Yoerkie, C., and A. Chory. Transmission Acoustic Vibration Testing. Fort Belvoir, VA: Defense Technical Information Center, July 1985. http://dx.doi.org/10.21236/ada159022.

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