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Journal articles on the topic 'Vibrational behaviour'

Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

Trampenau, J., K. Bauszus, W. Petry, and U. Herr. "Vibrational behaviour of nanocrystalline Ni." Nanostructured Materials 6, no. 5-8 (January 1995): 551–54. http://dx.doi.org/10.1016/0965-9773(95)00118-2.

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2

Brivio, Gian Paolo. "Chaotic behaviour in vibrational predesorption." Journal of Electron Spectroscopy and Related Phenomena 64-65 (December 1993): 555–62. http://dx.doi.org/10.1016/0368-2048(93)80121-2.

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3

Georgiev, Zlatin, and Lilo Kunchev. "Study of the vibrational behaviour of the components of a car suspension." MATEC Web of Conferences 234 (2018): 02005. http://dx.doi.org/10.1051/matecconf/201823402005.

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The paper presents a study of the vibrational behaviour of a car suspension in the frequency range from 50 to 200 Hz. The vehicle has a torsion spring suspension. The aim of the study is to provide a numerical approach, which evaluates the impact of the tyre vibration characteristics and the elastic properties of suspension elements on the vibrational behaviour of the “tyre-suspension-body” system. The object of the study are the elements of the suspension – stub-axle, upper and lower suspension arms, strut rod, torsion bar and others. The suspension is equipped with pneumatic tyres with different vibration characteristics. Laboratory experiments are done. The tyre contact patch is disturbed by harmonic force. The accelerations of the wheel axle and specific points of the suspension are obtained. A numerical model of the system is created by using the Finite Element Method available in SolidWorks Simulation software. The model allows to determinate the accelerations at different points of the suspension. The results of the experimental and theoretical studies are compared. The values obtained in the two studies are similar.

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4

Rieckmann, Marianne, James L. Park, John Codrington, and Ben Cazzolato. "Modelling the three-dimensional vibration of composite archery arrows under free–free boundary conditions." Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology 226, no. 2 (April 3, 2012): 114–22. http://dx.doi.org/10.1177/1754337112442273.

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Archery performance has been shown to be dependent on the resonance frequencies and operational deflection shape of the arrows. This vibrational behaviour is influenced by the design and material of the arrow and the presence of damage in the arrow structure. In recent years arrow design has progressed to use lightweight and stiff composite materials. This paper investigates the vibration of composite archery arrows through a finite difference model based on Euler–Bernoulli theory, and a three-dimensional finite element modal analysis. Results from the numerical simulations are compared to experimental measurements using a Polytec scanning laser Doppler vibrometer (PSV-400). The experiments use an acoustically coupled vibration actuator to excite the composite arrow with free–free boundary conditions. Evaluation of the vibrational behaviour shows good agreement between the theoretical models and the experiments.

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5

Planes, A., Ll Mañosa, and E. Vives. "Vibrational Behaviour of Cu-Based BCC Alloys." Journal de Physique IV 05, no. C8 (December 1995): C8–829—C8–834. http://dx.doi.org/10.1051/jp4/199558829.

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6

Frick, B., J. Williams, S. Treviño, and R. Erwin. "Vibrational behaviour of amorphous and crystalline ethylbenzene." Physica B: Condensed Matter 213-214 (August 1995): 506–9. http://dx.doi.org/10.1016/0921-4526(95)00194-e.

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7

Palopoli, C. M., S. B. Etcheverry, and E. J. Baran. "Vibrational and thermal behaviour of nicotinium dichromate." Thermochimica Acta 131 (August 1988): 273–77. http://dx.doi.org/10.1016/0040-6031(88)80080-7.

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8

Rebillard, E., and J. L. Guyader. "VIBRATIONAL BEHAVIOUR OF LATTICES OF PLATES: BASIC BEHAVIOUR AND HYPERSENSITIVITY PHENOMENA." Journal of Sound and Vibration 205, no. 3 (August 1997): 337–54. http://dx.doi.org/10.1006/jsvi.1997.1055.

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9

Nieh, J. C., and J. Tautz. "Behaviour-locked signal analysis reveals weak 200–300 Hz comb vibrations during the honeybee waggle dance." Journal of Experimental Biology 203, no. 10 (May 15, 2000): 1573–79. http://dx.doi.org/10.1242/jeb.203.10.1573.

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Waggle-dancing honeybees produce vibratory movements that may facilitate communication by indicating the location of the waggle dancer. However, an important component of these vibrations has never been previously detected in the comb. We developed a method of fine-scale behavioural analysis that allowed us to analyze separately comb vibrations near a honeybee waggle dancer during the waggle and return phases of her dance. We simultaneously recorded honeybee waggle dances using digital video and laser-Doppler vibrometry, and performed a behaviour-locked Fast Fourier Transform analysis on the substratum vibrations. This analysis revealed significantly higher-amplitude 200–300 Hz vibrations during the waggle phase than during the return phase (P=0.012). We found no significant differences in the flanking frequency regions between 100–200 Hz (P=0.227) and 300–400 Hz (P=0.065). We recorded peak waggle phase vibrations from 206 to 292 Hz (244+/−28 Hz; mean +/− s. d., N=11). The maximum measured signal - noise level was +12.4 dB during the waggle phase (mean +5.8+/−2.7 dB). The maximum vibrational velocity, calculated from a filtered signal, was 128 microm s(−)(1) peak-to-peak, corresponding to a displacement of 0.09 microm peak-to-peak at 223 Hz. On average, we measured a vibrational velocity of 79+/−28 microm s(−)(1) peak-to-peak from filtered signals. These signal amplitudes overlap with the detection threshold of the honeybee subgenual organ.

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10

Simon, G. "Prediction of Vibration Behaviour of Large Turbo-Machinery on Elastic Foundations Due to Unbalance and Coupling Misalignment." Proceedings of the Institution of Mechanical Engineers, Part C: Mechanical Engineering Science 206, no. 1 (January 1992): 29–39. http://dx.doi.org/10.1243/pime_proc_1992_206_092_02.

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A computational assessment of the vibrational behaviour of turbo-sets on elastic foundations is of significance with regard to the design and optimization of the complete installation. Using modern computer programs, for example, MADYN, and refined modelling techniques, the natural and response behaviour of even large systems can be calculated reliably, but there does remain some uncertainty, especially with regard to vibration excitement. The present contribution develops possibilities of how to handle these problems.

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11

Siano, Daniela, Roberto Citarella, and Enrico Armentani. "Simulation of a multi-cylinder engine vibrational behaviour." International Journal of Vehicle Noise and Vibration 14, no. 2 (2018): 101. http://dx.doi.org/10.1504/ijvnv.2018.095158.

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12

Yang, Zhaoshu, Lihua Tang, Mengying Xie, Shuaishuai Sun, Weihua Li, and Kean Aw. "Broadband nonlinear behaviour of a soft magneto-sensitive elastomer cantilever under low-frequency and low-magnitude excitation." Journal of Intelligent Material Systems and Structures 29, no. 15 (June 27, 2018): 3165–84. http://dx.doi.org/10.1177/1045389x18783088.

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In this article, a soft magneto-sensitive elastomer cantilever with strong nonlinear behaviour is presented. With the help of a permanent magnet, a strong nonlinear behaviour is observed under low-frequency and low-magnitude excitation, which demonstrated its potential for vibrational energy harvesting. A theoretical model is developed which incorporates the nonlinear magnetic interaction in an Euler–Bernoulli beam. The theoretical model is further discretized using finite element method, and the frequency response was obtained through numerical simulation. Frequency sweep experiment was conducted to validate the model and investigate the nonlinear behaviour of the cantilever under different excitations. With the validated model, various contributing factors were parametrically studied to investigate their influences towards the dynamic behaviour of the cantilever. The results show that magnetic force dominates the linear stiffness increase of soft magneto-sensitive elastomer cantilever rather than the magnetorheological effect, and the nonlinear performance of soft magneto-sensitive elastomer cantilever mainly derives from horizontal magnetic force variations during vibration. These properties make the soft magneto-sensitive elastomer cantilever an attractive candidate to automatically tune and broaden the operational bandwidth of vibrational energy harvesters.

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13

Muthukumaran, P., R. B. Bhat, and I. Stiharu. "LOCALIZATION OF STRUCTURAL VIBRATION AND ACOUSTIC RADIATION THROUGH BOUNDARY CONDITIONING." Transactions of the Canadian Society for Mechanical Engineering 22, no. 4B (December 1998): 519–32. http://dx.doi.org/10.1139/tcsme-1998-0030.

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Structural response and the resulting sound radiation due to excitations applied at any point on the structure depend very strongly on the boundary condition. Constraining structural vibration to the local areas of interest and modifying vibrational behaviour of the entire structure have numerous application s in sound and vibration control engineering. A concept of boundary conditioning has been proposed here in order to manipulate and control the vibration behaviour of the structure. A plate structure has been analyzed for its response and numerical results demonstrate the localization of structural vibration to the region of excitation by creating additional boundaries and conditioning them to achieve proper stiffness. This study shows that it is possible to localize the vibration and to alter mode shapes by advntageously modifying the boundary stiffness values.

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14

Perrier, Sébastien S., Yvan Champoux, and Jean-Marc Drouet. "The influence of a human hand-arm system on the vibrational dynamic behaviour of a compliant mechanical structure." Journal of Vibration and Control 23, no. 2 (August 9, 2016): 329–42. http://dx.doi.org/10.1177/1077546315577312.

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The aim of this study is to provide an approach to predicting human influence on a compliant mechanical structure using a substructuring technique. Substructuring techniques allow us to obtain detailed information on the vibrational behaviour of an assembly of structures by characterization of each structure separately. In this manuscript, a hand-arm system is coupled with a vibrating structure using a substructuring technique. A lightweight and compliant vibrating beam is used to demonstrate the concept. To demonstrate the feasibility of accurately predicting the hand-arm systems’ influence on the beam, we selected one position and tested it using four push forces. The characteristics of the hand-arm system for each configuration were coupled with the dynamic characteristics of the beam only over a frequency range of [5; 300] Hz. For each of the four configurations, the coupling predicts the influence of the hand on the vibrational behaviour of the beam. Reliable predictions were obtained for the vibrational behaviour of the assembly. The results indicate that the substructuring approach predicted the vibrational behaviour of the hand-arm-beam assembly with less than 3% error.

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15

Donzis, Diego A., and Agustin F. Maqui. "Statistically steady states of forced isotropic turbulence in thermal equilibrium and non-equilibrium." Journal of Fluid Mechanics 797 (May 17, 2016): 181–200. http://dx.doi.org/10.1017/jfm.2016.288.

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We investigate statistically steady states of turbulent flows when molecular degrees of freedom, in particular vibration, are taken into account. Unlike laminar flows initially in thermal non-equilibrium which asymptotically relax towards thermal equilibrium, turbulent flows present persistent departures from thermal equilibrium. This is due to fluctuations in temperature and other thermodynamic variables, which are known to increase with turbulent Mach number. Analytical results are compared to direct numerical simulations at a range of Reynolds and Mach numbers as well as molecular parameters such as relaxation times. Turbulent fluctuations are also shown to disrupt the distribution of energy between translational–rotational–vibrational modes even if thermal equilibrium is attained instantaneously relative to turbulence time scales, an effect that increases with characteristic relaxation times. Because of the nonlinear relation between temperature and vibrational energy in equilibrium, the fluctuation of the latter could be strongly positively skewed with long tails in its probability density function. This effect is stronger in flows with strong temperature fluctuations and when vibrational modes are partially excited. Because of the finite-time relaxation of vibration, departures from equilibrium result in very strong transfers of energy from the translational–rotational mode to the vibrational mode. A simple spectral model can explain the stronger departures from thermal equilibrium observed at the small scales. The spectral behaviour of the instantaneous vibrational energy can be described by classical phenomenology for passive scalars.

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16

Ennis, A. E., G. J. Bailey, and R. J. Moffett. "Vibrational nitrogen concentration in the ionosphere and its dependence on season and solar cycle." Annales Geophysicae 13, no. 11 (November 30, 1995): 1164–71. http://dx.doi.org/10.1007/s00585-995-1164-y.

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Abstract. A fully time-dependent mathematical model, SUPIM, of the Earth's plasmasphere is used in this investigation. The model solves coupled time-dependent equations of continuity, momentum and energy balance for the O+, H+, He+, N+2, O+2, NO+ ions and electrons; in the present study, the geomagnetic field is represented by an axial-centred dipole. Calculation of vibrationally excited nitrogen molecules, which has been incorporated into the model, is presented here. The enhanced model is then used to investigate the behaviour of vibrationally excited nitrogen molecules with F10.7 and solar EUV flux, during summer, winter and equinox conditions. The presence of vibrational nitrogen causes a reduction in the electron content. The diurnal peak in electron content increases linearly up to a certain value of F10.7, and above this value increases at a lesser rate, in agreement with previous observations and modelling work. The value of F10.7 at which this change in gradient occurs is reduced by the presence of vibrational nitrogen. Vibrational nitrogen is most effective at F-region altitudes during summer daytime conditions when a reduction in the electron density is seen. A lesser effect is seen at equinox, and in winter the effect is negligible. The summer reduction in electron density due to vibrational nitrogen therefore reinforces the seasonal anomaly.

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17

Baskurt, Mehmet, Jun Kang, and Hasan Sahin. "Octahedrally coordinated single layered CaF2: robust insulating behaviour." Physical Chemistry Chemical Physics 22, no. 5 (2020): 2949–54. http://dx.doi.org/10.1039/c9cp06015d.

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18

Groot, Maarten, Andrej Čokl, and Meta Virant-Doberlet. "Search behaviour of two hemipteran species using vibrational communication." Open Life Sciences 6, no. 5 (October 1, 2011): 756–69. http://dx.doi.org/10.2478/s11535-011-0056-2.

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AbstractThe ability of conspecifics to recognize and locate each other in the environment depends on the efficiency of intraspecific communication. We compared the mate searching strategies of southern green stinkbug Nezara viridula (male searches for a continuously calling female) and the leafhopper Aphrodes makarovi (partners form a precisely coordinated duet). Males of both species were tested on plants in playback experiments. One leaf was vibrated with unaltered conspecific female signals or with various conspecific signals using modified temporal parameters. The results showed that the onset of searching was faster in A. makarovi than in N. viridula. Changes in temporal parameters of female replies had negative effect on the searching behaviour of A. makarovi. Males located the source of longer female replies faster than the short female call and they failed to locate the source of a female reply with temporal parameters outside the species-specific values. In contrast, in N. viridula, searching males successfully located also the source of a female song with parameters outside the species-specific values. The results are discussed with regard to male behavioural strategies in species with different vibrational communication systems and different male mating investment.

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19

Machado, N. F. L., R. Valero, H. S. Domingos, J. Tomkinson, L. A. E. Batista de Carvalho, J. C. Otero, and M. P. M. Marques. "Conformational behaviour of antioxidant chromones. A vibrational spectroscopy study." Vibrational Spectroscopy 63 (November 2012): 325–37. http://dx.doi.org/10.1016/j.vibspec.2012.06.010.

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20

Němec, Ivan, Zorka Macháčková, Přemysl Vaněk, and Zdeněk Mička. "Piperidinium Nitrate - Study of Thermal Behaviour and Vibrational Spectra." Collection of Czechoslovak Chemical Communications 71, no. 2 (2006): 207–14. http://dx.doi.org/10.1135/cccc20060207.

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Piperidinium nitrate was studied by FTIR and FT Raman spectroscopy in the range 100-4000 cm-1 at 300 K. On the basis of DSC measurements which exhibit two effects indicating phase transition at 256 and 295 K, FTIR spectra were recorded down to a temperature of 90 K. Discussion of the phase transition mechanism is based on the observed changes in the FTIR spectra during cooling of the compound.

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21

Chang, S. C., and R. Yacamini. "Experimental study of the vibrational behaviour of machine stators." IEE Proceedings - Electric Power Applications 143, no. 3 (1996): 242. http://dx.doi.org/10.1049/ip-epa:19960184.

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22

Smith, Ian, and Ying Hei Chui. "Construction methods for minimizing vibration levels in floors with lumber joists." Canadian Journal of Civil Engineering 19, no. 5 (October 1, 1992): 833–41. http://dx.doi.org/10.1139/l92-094.

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The National Building Code of Canada 1990 specifies the allowable spans for lumber floor joists that are expected to lead to satisfactory vibrational behaviour. This paper discusses construction methods that improve the floor behaviour once the flooring and joists appropriate to a particular building occupancy have been selected. Laboratory tests on full-size floors demonstrate that adding between-joists bridging and supporting all four floor edges significantly improves the overall vibrational performance of wood floors. Bridging consisting of solid blocking glued to the underside of the flooring and a mild steel strap nailed to the underside of blocking and joists is more effective than several alternative details. Incorporating pads of damping material between flooring and joists, or at bearings, can have a detrimental effect on floor performance. The use of elastomeric adhesive, in lieu of nailed flooring-to-joist connections, does not significantly enhance the mechanical performance of floors with lumber joists. Key words: lumber, vibration, serviceability, floors, design detailing.

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23

Alsabagh, Abdel Salam Y., Sayel M. Fayyad, Nihad Darweesh, and Fadi Alfaqs. "Fundamental natural frequencies investigation for a typical 5-MW wind turbine blade." Noise & Vibration Worldwide 51, no. 4-5 (February 5, 2020): 77–84. http://dx.doi.org/10.1177/0957456520901355.

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Continuous structures such as beams, rods and plates can be modelled by discrete mass and stiffness parameters and analysed as multi-degree-of-freedom systems. The analysis of structural vibration is necessary to obtain the natural frequencies of a structure and the response to the external excitation. In this way, it can be determined whether a particular structure will fulfil its intended function and, in addition, the results of the dynamic loadings acting on a structure can be predicted. The lack of a sober analytical research about the vibrational behaviour of the 5-MW wind turbine blade pushed us to investigate about this crucial issue, however, most of the discreet researches are concerned with the aerodynamic effects rather than structural analysis. In this article, Rayleigh–Ritz method was implemented for a typical 5-MW wind turbine blade. MATLAB codes were developed and natural frequencies were obtained for both flapwise and edgewise vibrational behaviour. A good agreement was observed between the analytical results and the manufacturer results.

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24

Aubanel, Eric E., and André D. Bandrauk. "Molecules in strong laser fields: vibrational inversion and harmonic generation." Canadian Journal of Chemistry 72, no. 3 (March 1, 1994): 673–77. http://dx.doi.org/10.1139/v94-092.

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We examine two consequences of the unique behaviour of molecules in strong fields. First, by time gating of laser-induced avoided crossings with femtosecond laser pulses, one can obtain efficient vibrational inversion into a narrow distribution of vibrational levels of a molecular ion. We demonstrate this by numerical solution of the time-dependent Schrödinger equation for [Formula: see text] Second, we show results of numerical calculation with vibrationally excited [Formula: see text] of harmonic generation up to the 11th order of an intense 1064- nm laser. We predict that competition of photodissociation can be minimized by trapping the molecule in high-field-induced potential wells, thus enhancing the high-order harmonic generation process. Furthermore, the harmonic spectrum can serve as a measure of the structure of these laser-induced potentials.

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25

Kremer, Eugen. "The effect of high-frequency stochastic actions on the low-frequency behaviour of dynamic systems." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 379, no. 2192 (January 18, 2021): 20200242. http://dx.doi.org/10.1098/rsta.2020.0242.

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The dynamic system described by a finite number of first-order differential equations is considered. The right side of each equation is a sum of a slow, deterministic and, in the general case, nonlinear function of dynamic variables and a stochastic excitation. The stochastic action is a superposition of a finite number of independent random processes with coefficients depending on dynamic variables and slow time. The problem statement is oriented to applications in the field of driven systems. The analysis is based on the concept of vibration mechanics proposed by I. I. Blekhman. The modified method of direct separation of slow and fast motions uses the explicit introduction of a small parameter and some ideas of the two-scale technique. The general formulas for vibrational forces (or fluxes) are obtained. These additional terms appear in the resulting system for averaged motion instead of the stochastic terms to make the averaged system equivalent to the initial stochastic system with respect to slow motions and, in particular, to low-frequency resonances. As an example, the model of a vibration machine for bulk material processing is considered. The stochastic effect is caused by random oscillations of the bulk material mass. It is transformed into a modification of the machine's frequency characteristics leading to a specific stochastic resonance. This article is part of the theme issue ‘Vibrational and stochastic resonance in driven nonlinear systems (part 1)’.

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26

Goldshtein, Alexander, Michael Shapiro, Leonid Moldavsky, and Mati Fichman. "Mechanics of collisional motion of granular materials. Part 2. Wave propagation through vibrofluidized granular layers." Journal of Fluid Mechanics 287 (March 25, 1995): 349–82. http://dx.doi.org/10.1017/s002211209500098x.

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According to numerous experimental observations and theoretical models vibrated layers composed of large granules behave like a solid plastic body. In contrast, in this study experimental data are presented that reveal that, for constant vibration amplitudes A ≥ 1 cm with the frequency ω increasing from zero, all layers pass through three vibrational states, with the respective behaviours being as of (i) a solid plastic body, (ii) a liquid, (iii) a gas. In the liquid-like vibrational state transverse waves propagating along the layer width were observed. These waves were shown to be gravitational resonance waves, with the corresponding frequencies well correlated by the known formula for incompressible liquids. In the gas-like vibrational state compression (shock) and expansion waves propagating across the layer height, were observed.A theoretical model for time-periodic collisional vibrational regimes was developed on the basis of the Euler-like equations of a granular gas composed of inelastic spheres. The model shows that the vibrational granular state (bed porosity, shock wave speed, granular pressure and kinetic energy) is inter alia governed by the dimensionless parameter V = (Aω)/(hmg)1/2, with g, hm being the gravitational acceleration and the height of the resting layer, respectively. This is in contrast with the previous studies, where the behaviour of vibrated granular layers was interpreted in terms of the dimensionless acceleration Δ = (Aω2)/g. The proposed model was tested by processing the data obtained from photographs of the particle distribution within vibrated layers. Theoretical predictions of the particle average concentration compared favourably with the experimental data.Other phenomena observed in vibrated granular layers include the formation of caverns, circulatory motion of granules and synchronized periodic motion of two adjacent vibrated layers of different widths. The importance of the observed phenomena in relation to various technological processes involving bulk materials (vibromixing, vibroseparation, etc.) is discussed.

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27

Mazzoni, Valerio, Janez Prešern, Andrea Lucchi, and Meta Virant-Doberlet. "Reproductive strategy of the Nearctic leafhopper Scaphoideus titanus Ball (Hemiptera: Cicadellidae)." Bulletin of Entomological Research 99, no. 4 (October 24, 2008): 401–13. http://dx.doi.org/10.1017/s0007485308006408.

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AbstractMating behaviour of Scaphoideus titanus Ball, the vector of the grapevine disease Flavescence dorée, was investigated in order to determine the role of substrate-borne vibrational signals in intra-specific communication and pair formation. Vibrational signals were recorded from grapevine leaves with a laser vibrometer. Signalling activity of single males changed throughout the day and the peak in activity was associated with twilight and early night when ‘call and fly’ behaviour was observed. Pair formation began with the spontaneous emission of male signals. The male calling signal consisted of a single series of pulses, partially accompanied with a ‘rumble’. The male courtship phrase consisted of four consecutive sections characterized by two sound elements, pulse and ‘buzz’. Female vibrational signals were emitted only in response to male signals. The female response was a single pulse that closely resembled male pulses and was inserted between pulses within the male signals. All recorded vibrational signals of S. titanus have a dominant frequency below 900 Hz. A unique feature of vibrational communication in S. titanus is well-developed intrasexual competition; males may use alternative tactics, in the form of disturbance signals, or silently approach duetting females (satellite behaviour). While the male-female duet appears to be essential for successful localization of females and copulation, it is also vulnerable to, and easily disrupted by, alternative tactics like masking.

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EROL, Salih Seçkin, and Cemal MERAN. "Nondestructive Testing of Welded Test Setup Construction By Vibrational Behaviour." El-Cezeri Fen ve Mühendislik Dergisi 4, no. 2 (May 31, 2017): 258–65. http://dx.doi.org/10.31202/ecjse.318212.

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29

Solecka, Urszula, Tomasz Bajda, Justyna Topolska, and Maciej Manecki. "Structural and vibrational behaviour of pyromorphite-vanadinite solid solution series." Geology, Geophysics & Environment 41, no. 1 (2015): 135. http://dx.doi.org/10.7494/geol.2015.41.1.135.

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30

Hohl, A., L. Panning, C. Siewert, and A. Buerge. "The vibrational behaviour of bladed disks with multiple coupling devices." PAMM 7, no. 1 (December 2007): 4040037–38. http://dx.doi.org/10.1002/pamm.200700724.

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31

Siano, Daniela, Roberto Guglielmo Citarella, and Enrico Armentani. "Simulation of the vibrational behaviour of a multi-cylinder engine." International Journal of Vehicle Noise and Vibration 1, no. 1 (2018): 1. http://dx.doi.org/10.1504/ijvnv.2018.10014909.

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32

Juszyńska-Gałązka, E., and W. Zając. "Mesomorphic behaviour and vibrational dynamics of nCFPB liquid crystalline homologues." Phase Transitions 92, no. 12 (September 22, 2019): 1077–88. http://dx.doi.org/10.1080/01411594.2019.1669035.

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33

Botto, I. L. "Thermal and vibrational behaviour of Te(OH)6 · 2NH2CH2COOH · H2O." Journal of the Less Common Metals 128 (February 1987): 47–55. http://dx.doi.org/10.1016/0022-5088(87)90190-1.

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34

Kurec, Jevgenij, Vadim Mokšin, and Andrius Gedvila. "INFLUENCE OF QUALITY OF ROLLING SURFACES OF ROLLER BEARINGS ON THEIR VIBRATIONAL BEHAVIOUR / GUOLIŲ RIEDĖJIMO PAVIRŠIŲ KOKYBĖS ĮTAKA VIBROAKTYVUMUI." Mokslas - Lietuvos ateitis 5, no. 6 (December 31, 2013): 594–97. http://dx.doi.org/10.3846/mla.2013.95.

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The paper investigates vibrational behaviour of widely used rollerbearings No. NU207 which have different roughness of rollingsurfaces. Fatigue damage is one of the main factors that limitthe life of bearings of such type. The aims of present work wereto establish dependence of roughness parameter Ra of rollingsurfaces of bearings on their vibration velocity and investigatevibrational behaviour of roller bearings with different roughnessof rolling surfaces. Santrauka Straipsnyje nagrinėjami vienaeiliai cilindriniai ritininiai riedėjimo guoliai Nr. NU207, kurie plačiai naudojami šiuolaikiniuose įrenginiuose. Vienas iš šio tipo guoliams būdingų trūkumų yra riedėjimo paviršių nuovargio atsiradimas ir viso jų resurso nepanaudojimas. Šio darbo tikslas – nustatyti guolių riedėjimo takelių paviršių šiurkštumo parametro Ra įtaką vibracijų greičiui ir ištirti guolių vibracinį elgesį, esant skirtingiems šiurkštumo parametrams.

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35

Rossi, B., V. Venuti, A. Mele, C. Punta, L. Melone, F. D'Amico, A. Gessini, et al. "Vibrational signatures of the water behaviour upon confinement in nanoporous hydrogels." Physical Chemistry Chemical Physics 18, no. 17 (2016): 12252–59. http://dx.doi.org/10.1039/c5cp07936e.

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36

Minas, I., N. Morris, S. Theodossiades, M. O’Mahony, and J. Voveris. "Automotive dry clutch fully coupled transient tribodynamics." Nonlinear Dynamics 105, no. 2 (July 2021): 1213–35. http://dx.doi.org/10.1007/s11071-021-06605-x.

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AbstractDetermining the root causes of Noise, Vibration and Harshness (NVH) phenomena in modern automotive drivetrains is a task of critical importance. This research investigates the stability of dry clutch systems vibrational behaviour during engagement. A fully coupled dry clutch numerical model including the influence of friction is presented and validated using vehicle measurements. The clutch component frictional properties are measured using parts that exhibit aggressive NVH behaviour using representative tribometric experiments. The validated numerical tool highlights the occurrence of instabilities which are caused by modal couplings, particularly between the input shaft bending and clutch disc radial motions. Such a validated transient dynamics model of a dry clutch system has not hitherto been presented in the open literature.

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Diallo, Alpha O., Claude Meyer, and Nguyen Van-Thanh. "Article." Canadian Journal of Chemistry 77, no. 1 (January 1, 1999): 122–29. http://dx.doi.org/10.1139/v98-224.

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The frequencies of the O-D stretching vibrations of CH3COOD have been measured in the liquid and vapour phases and in the form of molecular associations with deoxycholic acid and cholesterol. The spectra confirm that the vapour phase is a mixture of monomeric and dimeric forms at room temperature. The vibrational assignment made for the gaseous phase is used in conjunction with prior data available on the monomeric O-D stretching frequencies in solutions to explain the spectroscopic behaviour of the molecular complexes. The pattern of frequency shifts suggests that deuterium bonding links the cholesterol and CH3COOD in the hydrophilic regions and that the self association of the heavy acid is limited to the dimeric species in the complex with deoxycholic acid. Extra absorption bands observed in the spectral region characteristic of the deuterium bond vibrations are tentatively considered to arise from O-D groups in different local environments with different vibrational energies compared with the D-bonded species. Further evidence for steroid-CH3COOD interactions is obtained from a study of the O-H and CbetaO stretching vibrations of the compounds.Key words: acetic acid-d, complexation with deoxycholic acid and cholesterol, infrared spectroscopy.

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Shukla, Anuradha, Eram Khan, Karnica Srivastava, Kirti Sinha, Poonam Tandon, and Venu R. Vangala. "Study of molecular interactions and chemical reactivity of the nitrofurantoin–3-aminobenzoic acid cocrystal using quantum chemical and spectroscopic (IR, Raman, 13C SS-NMR) approaches." CrystEngComm 19, no. 28 (2017): 3921–30. http://dx.doi.org/10.1039/c7ce00864c.

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Sung, Woongmo, Christian Müller, Sebastian Hietzschold, Robert Lovrinčić, Nathaniel P. Gallop, Artem A. Bakulin, Satoshi Nihonyanagi, and Tahei Tahara. "Preferred orientations of organic cations at lead-halide perovskite interfaces revealed using vibrational sum-frequency spectroscopy." Materials Horizons 7, no. 5 (2020): 1348–57. http://dx.doi.org/10.1039/c9mh01394f.

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Using vibrational sum frequency generation (VSFG) spectroscopy, we investigate the behaviour of organic cations at the surface of a series of multilayer lead halide perovskite systems, finding that the behaviour of the organic cations changes dramatically close to the interface.

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Calvo, Angela, Roberto Deboli, Christian Preti, and Antonino De Maria. "Daily exposure to hand arm vibration by different electric olive beaters." Journal of Agricultural Engineering 45, no. 3 (November 5, 2014): 103. http://dx.doi.org/10.4081/jae.2014.424.

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The electric hand held olive harvesters have a low weight (about 2 kg) and cause the fruit pick up by means of impacts produced by their vibrational tools: for this reason they transmit elevated vibration doses to the operator’s hand arm system during the work. In this paper electric beaters of different manufacturers and different models were considered, to analyse their vibrational behaviour in field, during the olive harvesting campaign in a site located in Northern Italy. One operator did the tests, to avoid the operator’s uncertainty on the obtained results. All the five examined beaters gave high acceleration values (in a range from 10 to 26 ms<sup>–2</sup>), but the most restricting data were the daily vibration exposures, calculated considering the real working duration time acquired in field, almost ranged between 10 and 18 ms<sup>–2</sup>. Also the operator posture during the work (with the arms over the shoulders) may set health problems, related to upper limb disorders, other than the already known musculoskeletal, nervous and vascular pathologies.

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Motamedi, Mohammad Amin, and Saied Irani. "Analysis of multiple frequency excitations of a cracked beam using nonlinear vibrations." International Journal of Advanced Engineering, Sciences and Applications 1, no. 1 (January 30, 2020): 1–10. http://dx.doi.org/10.47346/ijaesa.v1i1.16.

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In this study, under harmonic multiple frequency excitations, the dynamic response of a cracked cantilever beam is investigated. The breathing crack model is assumed to show the nonlinear behaviour of a transverse crack. The first mode of vibration and the single degree freedom lumped system is considered to simplify the case study. Because of applying the multiple frequency excitations, the analysis is applied in a combinational resonance. Multiple time scales method is employed to solve the motion equation of the crack, and the nonlinear vibrational responses are obtained. Then, by changing the crack parameters and frequency of the excitations, the different dynamic responses of the crack are demonstrated. The proposed model shows that the crack parameters analysis in nonlinear vibration of multiple excitations could be an appropriate method to recognise the crack and the depth of the damage. Results indicate that the beam analysis under multiple frequency excitations is more sensitive than the single frequency excitation to illustrate the impacts of the crack parameters on its vibrational nonlinearity responses.

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Huang, Diangui. "Characteristics of Torsional Vibrations of a Shaft System with Parallel Misalignment." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 219, no. 11 (November 1, 2005): 1219–24. http://dx.doi.org/10.1243/095440605x32020.

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Couplings are important parts in the movement of a shaft system. A coupling can transfer the torque from one shaft to another through deforming itself. If parallel misalignment exists, the couplings will produce an extra deformation besides the deformation produced by transferring the torque. The exciting moment with one-time rotating frequency produced by this extra deformation is analysed in this article. This moment will result in torsional vibration at one-time rotating frequency. By use of DK-II torsional vibration measurement system, an experimental study of torsional vibrational behaviour in a parallel misalignment shaft system is carried out. The experimental results support the conclusion of analysis.

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O'Malley, Alexander J., Stewart F. Parker, and C. Richard A. Catlow. "Neutron spectroscopy as a tool in catalytic science." Chemical Communications 53, no. 90 (2017): 12164–76. http://dx.doi.org/10.1039/c7cc05982e.

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The unique power of neutron spectroscopy to probe molecular behaviour in catalytic systems is illustrated. Vibrational spectroscopy and quasielastic scattering techniques are introduced, along with their use in probing methanol-to-hydrocarbons and methane reforming catalysis, and also hydrocarbon behaviour in microporous catalysts.

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Tonazzi, Davide, Francesco Massi, Laurent Baillet, Jacopo Brunetti, and Yves Berthier. "Interaction between contact behaviour and vibrational response for dry contact system." Mechanical Systems and Signal Processing 110 (September 2018): 110–21. http://dx.doi.org/10.1016/j.ymssp.2018.03.020.

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Mevellec, J. Y., S. Quillard, M. I. Boyer, and J. P. Buisson. "Structural effects on the vibrational behaviour ofN,N?-Diphenyl-1,4-phenylenediamine." Journal of Raman Spectroscopy 32, no. 8 (2001): 701–9. http://dx.doi.org/10.1002/jrs.732.

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Wang, H., and K. Williams. "EFFECTS OF LAMINATIONS ON THE VIBRATIONAL BEHAVIOUR OF ELECTRICAL MACHINE STATORS." Journal of Sound and Vibration 202, no. 5 (May 1997): 703–15. http://dx.doi.org/10.1006/jsvi.1996.0845.

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Mazzoni, Valerio, Andrea Lucchi, Andrej Čokl, Janez Prešern, and Meta Virant-Doberlet. "Disruption of the reproductive behaviour ofScaphoideus titanusby playback of vibrational signals." Entomologia Experimentalis et Applicata 133, no. 2 (September 25, 2009): 174–85. http://dx.doi.org/10.1111/j.1570-7458.2009.00911.x.

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El-Dannanh, E. H. "Flexural vibrational behaviour of an elastic linkage containing a transverse crack." Mechanism and Machine Theory 30, no. 2 (February 1995): 285–97. http://dx.doi.org/10.1016/0094-114x(94)e0010-h.

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Schinke, R., H. M. Keller, M. Stumpf, and A. J. Dobbyn. "Vibrational resonances in molecular photodissociation: from state-specific to statistical behaviour." Journal of Physics B: Atomic, Molecular and Optical Physics 28, no. 15 (August 14, 1995): 3081–111. http://dx.doi.org/10.1088/0953-4075/28/15/005.

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Comins, J. D., C. Heremans, M. D. Salleh, G. A. Saunders, and W. Hönle. "Elastic behaviour and vibrational anharmonicity of the cluster compound (Ag6Sn4P12)Ge6." Journal of Materials Science Letters 5, no. 11 (November 1986): 1195–97. http://dx.doi.org/10.1007/bf01742246.

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