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Journal articles on the topic 'Damping; Statistical Energy Analysis'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Lu, Leo K. H. "Optimum Damping Selection by Statistical Energy Analysis." Journal of Vibration and Acoustics 112, no. 1 (1990): 16–20. http://dx.doi.org/10.1115/1.2930090.

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It is widely accepted that for mitigating the vibration developed in structures, damping should be applied to the components with the largest response and be added at locations in the components’ energy transmission paths. However, it is difficult to determine the optimum damping location for some complicated dynamic systems. In this paper, the SEA concept is used to prove mathematically the reason for damping application and also to provide a convenient procedure for selecting the location of the damping treatment.

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Mace, B. R., and L. Ji. "The statistical energy analysis of coupled sets of oscillators." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 463, no. 2081 (2007): 1359–77. http://dx.doi.org/10.1098/rspa.2007.1824.

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The paper concerns the statistical energy analysis (SEA) of two conservatively coupled oscillators, sets of oscillators and continuous subsystems under broadband excitation. The oscillator properties are assumed to be random and ensemble averages found. Account is taken of the correlation between the coupling parameters and the oscillator energies. For coupled sets of oscillators or continuous subsystems, it is assumed that the coupling power between a pair of oscillators is proportional to the difference of either their actual energies or their ‘blocked’ energies, and expressions for the ense

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3

Yap, F. F., and J. Woodhouse. "INVESTIGATION OF DAMPING EFFECTS ON STATISTICAL ENERGY ANALYSIS OF COUPLED STRUCTURES." Journal of Sound and Vibration 197, no. 3 (1996): 351–71. http://dx.doi.org/10.1006/jsvi.1996.0536.

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4

Zhang, Guo Jun, and Yun Ju Yan. "Applications of Statistical Energy Analysis in Influencing Factors Analysis of Aircraft Vibro-Acoustic Response Characteristics." Applied Mechanics and Materials 300-301 (February 2013): 810–13. http://dx.doi.org/10.4028/www.scientific.net/amm.300-301.810.

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The SEA model of hypersonic aircraft is established based on statistical energy analysis (SEA) theory. Three parameters of the SEA model are established by the theory and experiential formula. According to damping loss factors of model subsystem and acoustic absorptivity of cavity, sensitivity analysis of vibro-acoustic response is discussed. The effect that division way of plate subsystem and material structure cause to vibro-acoustic response is analyzed. The analysis results show that the material structure, damping loss factors and material type have the great effect on the characteristics

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Zhang, Xiao Feng, You Gang Xiao, Yu Shi, and Wu Yang Zeng. "Statistical Energy Analysis of Subway Wheel/Track Noise." Applied Mechanics and Materials 423-426 (September 2013): 1563–66. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.1563.

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Dividing wheel-track system of subway into a series of sub-systems, the statistical energy analysis (SEA) model of wheel/track system is established. The factors affecting the wheel/track noise, such as modal density, damping loss factors, coupling loss factors, are gotten by theoretical analysis combined with experiments. The calculated results show that the track noise is about 4.5 dB(A) higher than the wheel noise at 160 km/h, and the wheel noise is reduced by 2.8 dB(A) at 160 km/h and by 2.3 dB(A) at 90 km/h by attaching damped layer plates to the wheels, but the total reduction is only 0.

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6

Lafont, T., N. Totaro, and A. Le Bot. "Review of statistical energy analysis hypotheses in vibroacoustics." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 470, no. 2162 (2014): 20130515. http://dx.doi.org/10.1098/rspa.2013.0515.

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This paper is a discussion of the equivalence between rain-on-the-roof excitation, diffuse field and modal energy equipartition hypotheses when using statistical energy analysis (SEA). A first example of a simply supported plate is taken to quantify whether a field is diffuse or the energy is equally distributed among modes. It is shown that the field can be diffuse in a certain region of the frequency-damping domain with a single point force but without energy equipartition. For a rain-on-the-roof excitation, the energy becomes equally distributed, and the diffuse field is enforced in all reg

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Yang, Xiao Yan, You Gang Xiao, and Yu Shi. "Statistical Energy Analysis of Wind Noise in High-Speed Train Cab." Applied Mechanics and Materials 249-250 (December 2012): 307–13. http://dx.doi.org/10.4028/www.scientific.net/amm.249-250.307.

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Statistical energy analysis(SEA) method has many advantages in analysis of high frequency, high modal density and complex dynamic systems. Dividing high-speed train cab into a series of sub-systems, the SEA model of high-speed train cab was established. The factors affecting the cab noise, such as modal density, damping loss factors, coupling loss factors, were gotten by theoretical analysis combined with experiments. Using large eddy simulation method, the fluctuation pressures from train head surface were calculated. Using fluctuation pressure as excitation source, wind noise spectra and pow

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Yang, Qiao, Hai Bo Chen, and Yong Yan Wang. "Statistical Energy Analysis of Fractional Derivative Model-Based Rubber Vibration Isolating System." Applied Mechanics and Materials 437 (October 2013): 114–19. http://dx.doi.org/10.4028/www.scientific.net/amm.437.114.

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The fractional derivative model and Coulomb friction model are introduced to describe the nonlinear characteristics of rubber isolators. Then the non-conservative coupling theory is used to calculate the statistical energy analysis (SEA) parameters of a typical non-conservative coupling system formed by two square plates and a rubber isolator. Numerical results are compared with those obtained by using the traditional viscous damping model, which shows that higher accuracy can be obtained by using the fractional derivative model in high-frequency band.

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9

Liu, Quanmin, Xiaozhen Li, Xun Zhang, Yunlai Zhou, and Y. Frank Chen. "Applying constrained layer damping to reduce vibration and noise from a steel-concrete composite bridge: An experimental and numerical investigation." Journal of Sandwich Structures & Materials 22, no. 6 (2018): 1743–69. http://dx.doi.org/10.1177/1099636218789606.

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Structure-borne noise from railway bridges has become increasingly severe due to increased train speeds and axle loads. Constrained layer damping can suppress structural vibration and noise considerably across a wide frequency range by dissipating vibrational energy via damping layer shear deformation. This paper proposes a theoretical method of calculating the train-induced vibration and noise of a constrained layer damping-enhanced railway bridge based on the train–track–bridge coupled vibration, the modal strain energy method, and statistical energy analysis. First, the vibration responses

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10

WADA, Hirofumi, Takayuki KOIZUMI, Nobutaka TSUJIUCHI, Hiroshi UEHARA, and Satoshi MORITA. "604 Damping Loss Factor Estimation Method of Statistical Energy Analysis Using Power Injection Method." Proceedings of Conference of Kansai Branch 2010.85 (2010): _6–4_. http://dx.doi.org/10.1299/jsmekansai.2010.85._6-4_.

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11

Liu, A. Q., S. P. Lim, and S. T. Chow. "Statistical energy analysis on the damping effect of the oil pan on engine vibration." Applied Acoustics 34, no. 2 (1991): 131–41. http://dx.doi.org/10.1016/0003-682x(91)90028-d.

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12

Sulla, Francesco, Matti Koivisto, Janne Seppanen, Jukka Turunen, Liisa C. Haarla, and Olof Samuelsson. "Statistical Analysis and Forecasting of Damping in the Nordic Power System." IEEE Transactions on Power Systems 30, no. 1 (2015): 306–15. http://dx.doi.org/10.1109/tpwrs.2014.2329489.

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13

KOIZUMI, Takayuki, Nobutaka TSUJIUCHI, Hirofumi WADA, and Mitsugu KANEKO. "1002 Damping Loss Factor Estimation Method by Using Finite Element Method in Statistical Energy Analysis." Proceedings of Conference of Kansai Branch 2012.87 (2012): _10–2_. http://dx.doi.org/10.1299/jsmekansai.2012.87._10-2_.

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14

Xu, Qianlong, Ye Li, Yingkai Xia, Weixing Chen, and Feng Gao. "Performance assessments of the fully submerged sphere and cylinder point absorber wave energy converters." Modern Physics Letters B 33, no. 13 (2019): 1950168. http://dx.doi.org/10.1142/s0217984919501689.

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Fully submerged sphere and cylinder point absorber (PA), wave energy converters (WECs) are analyzed numerically based on linearized potential flow theory. A boundary element method (BEM) (a radiation–diffraction panel program for wave-body interactions) is used for the basic wave-structure interaction analysis. In the present numerical model, the viscous damping is modeled by an equivalent linearized damping which extracts the same amount of wave energy over one cycle as the conventional quadratic damping term. The wave power capture width in each case is predicted. Comparisons are also made b

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15

Ma, Du-Meng, Shu-Ling Zhang, Ying Zhang, and Wei Xu. "Stochastic analysis of a nonlinear electromagnetic energy harvesting system with fractional damping under additive and multiplicative stochastic excitation." International Journal of Modern Physics B 34, no. 14n16 (2020): 2040113. http://dx.doi.org/10.1142/s021797922040113x.

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Electromagnetic energy harvester has been widely concerned in recent years due to its advantages of small size and high sensing frequency. In this paper, the stochastic behaviors of a nonlinear electromagnetic energy harvesting system (NEEH) with fractional damping are investigated under the additive and multiplicative stochastic excitation. Firstly, by applying the stochastic average method to the NEEH system, the mean square of the output current, and the steady-state probability density of vibration amplitude, displacement and velocity are obtained. Meanwhile, the validity of the theoretica

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Chen, Shuming, Dengfeng Wang, and Yingfeng Lei. "Automotive Interior Noise Prediction Based on Single Sound Cavity Using Statistical Energy Analysis Method." Noise & Vibration Worldwide 42, no. 11 (2011): 36–43. http://dx.doi.org/10.1260/0957-4565.42.11.36.

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In order to predict car interior noises at the car design and development stage, the statistical energy analysis (SEA) method was used. All the input parameters – modal density (MD), damping loss factor (DLF) and coupling loss factor (CLF) were calculated with SEA principle. Meanwhile, the sound excitation was calculated with sound power experiment data of internal combustion engine given by the engine manufacturer and sound source radiation formula. Engine mount excitation was also computed through the acceleration at initiative side of the engine mount and the transmissibility. A car virtual

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17

Fang, X., and J. Tang. "A Direct Simulation Monte Carlo Approach for the Analysis of Granular Damping." Journal of Computational and Nonlinear Dynamics 2, no. 2 (2006): 180–89. http://dx.doi.org/10.1115/1.2447502.

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Granular damping, which possesses promising features for vibration suppression in harsh environments such as in turbo-machinery and spacecraft, has been studied using empirical analysis and more recently using the discrete element method (DEM). The mechanism of granular damping is nonlinear and, when numerical analyses are employed, usually a relatively long simulation time of structural vibration is needed to reflect the damping behavior. The present research explores the granular damping analysis by means of the direct simulation Monte Carlo (DSMC) approach. Unlike the DEM that tracks the mo

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18

Turkdogru Gurun, Nurkan, Jonathan Chen, Frederick Ward, Matthew Wilcox, and Zhiming Luo. "Prediction and Improvement of Aircraft Cabin Acoustics using Statistical Energy Analysis and Sound Quality Evaluation." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (2021): 257–66. http://dx.doi.org/10.3397/in-2021-1382.

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Aircraft interior acoustic design is a key influencer for cabin comfort. An essential part of the design is optimization of acoustic insulation systems under weight restrictions to create a pleasant environment for human ear. Considering the complexity of aircraft geometry, noise sources, and transfer paths, computational prediction techniques become invaluable tools for increasing the accuracy in material selection while reducing design time and costs. In this study, a procedure that integrates sound quality evaluation with Statistical Energy Analysis (SEA) to design aircraft acoustic insulat

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19

Victor, Tyrode, Nicolas Totaro, Laurent Maxit, and Alain Le Bot. "Vibrational energy distribution in plate excited with random white noise." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 6 (2021): 965–69. http://dx.doi.org/10.3397/in-2021-1712.

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In Statistical Energy Analysis (SEA) and more generally in all statistical theories of sound and vibration, the establishment of diffuse field in subsystems is one of the most important assumption. Diffuse field is a special state of vibration for which the vibrational energy is homogeneously and isotropically distributed. For subsystems excited with a random white noise, the vibration tends to become diffuse when the number of modes is large and the damping sufficiently light. However even under these conditions, the so-called coherent backscattering enhancement (CBE) observed for certain sym

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20

DEKKER, H. "KINETICS OF NEARLY DEGENERATE METASTABLE SYSTEMS WITH OHMIC DISSIPATION: THE NON-GAUSSIAN QUANTUM STATISTICAL PATH INTEGRAL." International Journal of Modern Physics B 04, no. 04 (1990): 549–67. http://dx.doi.org/10.1142/s0217979290000279.

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Using a generalized version of Langer's "imaginary part of the free energy" method the quantum decay rate Γ = A exp (−B) of a metastable ohmic oscillator — with harmonic frequency ω0 and quantum friction coefficient α — is studied for an almost symmetric barrier and a "free" exit space, involving an "inflection scattering" center. The unstable anomalous fluctuation mode (of the "breathing bounce" configuration in the partition function) is analytically continued in a fully "dynamical" manner. At zero friction and zero temperature the result for Γ agrees with the escape rate found from the pert

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21

Clarkson, B. L. "Estimation of the Coupling Loss Factor of Structural Joints." Proceedings of the Institution of Mechanical Engineers, Part C: Mechanical Engineering Science 205, no. 1 (1991): 17–22. http://dx.doi.org/10.1243/pime_proc_1991_205_085_02.

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This paper shows how Bishop's receptance method can be used to derive the transmission of vibrational energy across a structural joint. The results are averaged over frequency bands and on the assumption of light damping an approximate formula for the coupling loss factor is obtained. This is an important parameter in the statistical energy analysis method of estimating the response of structures to broad-band random forces. The results compare well with those obtained by the travelling wave method.

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22

Hinze, Matthias, André Schmidt, and Remco I. Leine. "Lyapunov Stability of a Fractionally Damped Oscillator with Linear (Anti-)Damping." International Journal of Nonlinear Sciences and Numerical Simulation 21, no. 5 (2020): 425–42. http://dx.doi.org/10.1515/ijnsns-2018-0381.

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AbstractIn this paper, we develop a Lyapunov stability framework for fractionally damped mechanical systems. In particular, we study the asymptotic stability of a linear single degree-of-freedom oscillator with viscous and fractional damping. We prove that the total mechanical energy, including the stored energy in the fractional element, is a Lyapunov functional with which one can prove stability of the equilibrium. Furthermore, we develop a strict Lyapunov functional for asymptotic stability, thereby opening the way to a nonlinear stability analysis beyond an eigenvalue analysis. A key resul

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23

He, Li, and Xian Guo Ye. "A Study on Elastic Input Energy Spectra Based on the Compound Intensity Indicator." Advanced Materials Research 446-449 (January 2012): 140–45. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.140.

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Determination of a SDOFS elastic input energy is the primary problem to solve for energy-based design approach. The effect of ground motion and damping ratio were analyzed on the input energy spectra. is selected as the compound ground motion intensity indicator to represent the damage potential of strong ground motion. Through inputting of 188 seismic records according to the site classification of Chinese seismic code, three-segment elastic energy spectra are proposed based on normalization methods. The calculation formula of the peak and the value of long-period section of the input energy

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24

Sen'kevich, S. E., YE N. Il'chenko, Z. A. Godzhayev, and V. V. Duryagina. "Results of field studies of a tractor of traction class 1,4 with an elastic damping mechanism in a power drive." Izvestia MGTU MAMI 1, no. 4 (2020): 70–79. http://dx.doi.org/10.31992/2074-0530-2020-46-4-70-79.

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The topic of this paper is analyzing the results of field studies of a tractor with an elastic damping mechanism in a power drive and its operational efficiency assessment in comparison with a serial tractor. The subject of the research is a tractor with an elastic damping mechanism in a power drive as part of a plowing unit with a mounted plow. The purpose of this work is a detailed analysis of the influence of the parameters of the elastic-damping mechanism on the performance of a tractor with a plow. Carrying out such studies makes it possible to obtain new experimental data on the operatio

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Weissman, Karen, Mark McNelis, and William Pordan. "Implementation of Acoustic Blankets in Energy Analysis Methods with Application to the Atlas Payload Fairing." Journal of the IEST 37, no. 4 (1994): 32–39. http://dx.doi.org/10.17764/jiet.2.37.4.a5k692w88170707q.

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Energy analysis methods are commonly used to predict the vibroacoustic response of a spacecraft inside a launch vehicle payload fairing during liftoff. The payload fairing wall is often lined with acoustic blankets which can be difficult to model. This paper shows the development of a practical working method for accurately representing acoustic blankets in a VAPEPS statistical energy analysis model. A clear scaling relationship between the acoustic absorption coefficient and the blanket thickness is established. The scaling procedure is demonstrated using two sets of data for different absorp

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Gordaninejad, F., and R. Bindu. "THE EFFECT OF SCALE FACTOR ON THE PERFORMANCE OF ELECTRO-RHEOLOGICAL FLUID DAMPERS." International Journal of Modern Physics B 10, no. 23n24 (1996): 3133–41. http://dx.doi.org/10.1142/s0217979296001574.

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Theoretical and experimental scale analyses are conducted to investigate the effects of length of the damper and electric field strength on the damping and stiffness coefficients of electrorheological fluid (ERF) dampers. It is demonstrated that by employing the results obtained from smaller size prototypes, the energy absorbing capacity of larger dampers can be estimated.

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DROZDOV, V. A., D. O. EREMENKO, O. V. FOTINA та ін. "FISSION TIME OF α-INDUCED REACTIONS MEASURED BY THE CRYSTAL BLOCKING TECHNIQUE". International Journal of Modern Physics E 19, № 05n06 (2010): 1227–35. http://dx.doi.org/10.1142/s0218301310015710.

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A large set of experimental observables for the 232 Th , 235 U (α, xnf ) reactions has been analyzed within the dynamic-statistical approach with allowance for the nuclear dissipation phenomenon, the double humped structure of fission barrier, and also the temperature damping of shell effects. The energy dependences of the lifetime effect (experimentally measured by the crystal blocking technique) along the corresponding data on the fission fragment angular anisotropy and also fission probabilities of U and Pu isotopes produced in the reactions were chosen for the analysis. Reliable informatio

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28

Yan, Feng, Robin Wilson, and Peter Rutherford. "Prediction of acoustic transmission in heavily damped system using hybrid Ray-Tracing-SEA method." Noise Control Engineering Journal 68, no. 3 (2020): 226–36. http://dx.doi.org/10.3397/1/376819.

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Classic statistical energy analysis mainly deals with the energy transmission of system with relatively low damping. With the application of passive damping treat- ments, one of the fundamental assumptions in SEA, i.e., a diffused field, tends to fail. The energy attenuation along transmission path becomes so significant that there may exist large energy level difference within one structural component. In light of this, this study proposes to use a hybrid ray-tracing-SEA method to predict the acoustic transmission in heavily damped system. Heavily damped structural compo- nents are treated as

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De Francesco, Alessio, Luisa Scaccia, Marco Maccarini, et al. "Interpreting the Terahertz Spectrum of Complex Materials: The Unique Contribution of the Bayesian Analysis." Materials 12, no. 18 (2019): 2914. http://dx.doi.org/10.3390/ma12182914.

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In the last few decades, experimental studies of the terahertz spectrum of density fluctuations have considerably improved our knowledge of the mesoscopic dynamics of disordered materials, which also have imposed new demands on the data modelling and interpretation. Indeed, lineshape analyses are no longer limited to the phenomenological observation of inelastic features, as in the pioneering stage of Neutron or X-ray spectroscopy, rather aiming at the extraction from their shape of physically relevant quantities, as sound velocity and damping, relaxation times, or other transport coefficients

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Treszkai, Marcell, and Daniel Feszty. "Effect of junction type on the vibroacoustic response of a system of plates." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (2021): 3953–62. http://dx.doi.org/10.3397/in-2021-2565.

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Modelling of junctions is one of the most challenging tasks in vibroacoustics, especially for Statistical Energy Analysis (SEA), where the results heavily depend on the damping (DLF) and coupling loss factors (CLF). Also, it is an interesting question to determine that to what extent does the DLF or CLF contribute to the overall vibroacoustic characteristics of a structure? The aim of this paper is to investigate via measurements and SEA simulations the effect of the ratio of DLF and CLF on the response of a system for various junctions, such as riveting, bolting, line and point welding, betwe

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Senkevich, S. E., and N. S. Kryukovskaya. "Analysis of experimental studies of the tractor equipped with an elastic-damping mechanism in the transmission when moving as part of a transport tractor unit." Traktory i sel'hozmashiny 1, no. 6 (2020): 59–66. http://dx.doi.org/10.31992/0321-4443-2020-6-59-66.

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The cargo transportation is an integral and energy-consuming part of agricultural production. To improve the energy performance of transport tractor units (TTU), an elastic-damping mechanism (EDM) installed in the tractor transmission was developed. An experimental study was conducted to identify the influence of the EDM on the operation of the tractor as part of the TTU, when it is moving on a dirt road in the 9th gear of the main speed range of the gearbox (GB) of the tractor. A tractor of traction class 1.4 was used. Energy sensors were installed on the main elements of the tractor. The ene

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Mao, Jie, Zhi Yong Hao, Xin Rui Chen, and Ji Yang. "The Application of SEA in Automobile Dash Sound Transmission Loss Numerical Calculation." Applied Mechanics and Materials 152-154 (January 2012): 894–99. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.894.

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In order to study the structure-borne sound radiation, statistical energy analysis (SEA) was adopted and an automobile dash was divided into 31 subsystems; the modal density, damping loss factor (DLF) and coupling loss factor (CLF) were acquired, which were the basic parameters of SEA; then dash transmission loss (TL) at the middle and high frequency (MHF) ranging from 100 Hz to 10k Hz was calculated. The most outstanding advantage of SEA was that calculation could be fast done, which was more convenient than FEM (Finite Element Method) and BEM (Boundary Element Method). Finally, a TL experime

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CHANG, WEN-TENG. "CLAMPING LOSSES OF FOLDED- AND STRAIGHT-BEAM MEMS RESONATORS MADE FROM POLYCRYSTALLINE 3C-SiC FILMS." International Journal of Modern Physics B 25, no. 06 (2011): 885–96. http://dx.doi.org/10.1142/s0217979211057980.

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This paper presents an analysis of clamping losses in microelectromechanical systems (MEMS)-based, flexural mode silicon carbide (SiC) lateral resonators. The study includes folded- and straight-beam resonators made from (111) polycrystalline 3 C - SiC side by side. The device testing was conducted at 30 μTorr using a transimpedance-amplifier-based circuit to measure the total quality factor. It was found that thermoelastic damping (TED) in SiC MEMS-based lateral resonators has minimal contributions to overall energy dissipation in the aforementioned devices. Moreover, the difference in materi

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Piersol, Allan. "Preliminary Design Procedures for Equipment Exposed to Random Vibration Environments." Journal of the IEST 44, no. 1 (2001): 23–27. http://dx.doi.org/10.17764/jiet.44.1.b44215m70k35l246.

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A New NASA Handbook presents recommended procedures for the preliminary and final design of equipment items exposed to various dynamic loads, including random vibration excitations.1 For the final design when the geometric details of the equipment items have been largely determined, finite element method (FEM) and statistical energy analysis (SEA) procedures can be employed to predict the maximum stresses in equipment items due to random vibration excitations at their mounting points. In the preliminary design phase, however, more approximate prediction techniques are often needed, as summariz

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XIAO, Z., M. WAN, S. CHEN, and G. L. EYINK. "Physical mechanism of the inverse energy cascade of two-dimensional turbulence: a numerical investigation." Journal of Fluid Mechanics 619 (January 25, 2009): 1–44. http://dx.doi.org/10.1017/s0022112008004266.

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We report an investigation of inverse energy cascade in steady-state two-dimensional turbulence by direct numerical simulation (DNS) of the two-dimensional Navier–Stokes equation, with small-scale forcing and large-scale damping. We employed several types of damping and dissipation mechanisms in simulations up to 20482 resolution. For all these simulations we obtained a wavenumber range for which the mean spectral energy flux is a negative constant and the energy spectrum scales as k−5/3, consistent with the predictions of Kraichnan (Phys. Fluids, vol. 439, 1967, p. 1417). To gain further insi

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Pogorzelski, Stanisław, Paweł Rochowski, Maciej Grzegorczyk, Bogumił B. J. Linde, Ewa Skrodzka, and Łukasz Bielasiewicz. "Detection of Wavy Sea Surface Oil-Derivative Contamination with Forward Specular High-Frequency Scattering." Polish Maritime Research 27, no. 1 (2020): 173–79. http://dx.doi.org/10.2478/pomr-2020-0018.

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AbstractA spectrum of low-frequency (20–30 Hz) amplitude fluctuations of the ultrasonic (10 MHz) signal specularly scattered from water surfaces covered with monomolecular and thicker crude oil origin films of well-defined, oceanographically relevant viscoelastic properties was examined in laboratory and at-sea conditions. The relationship between the surface water wave (30 Hz) damping coefficient and the oil layer thickness was established, and compared to the one predicted by the classical Stokes theory. The depression of the spectral energy density of wind-driven waves by surface films was

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Wan Mohtar, W. H. M., and A. ElShafie. "Characteristics of Low Reynolds Number Shear-Free Turbulence at an Impermeable Base." Scientific World Journal 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/683537.

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Shear-free turbulence generated from an oscillating grid in a water tank impinging on an impermeable surface at varying Reynolds number74≤Rel≤570was studied experimentally, where the Reynolds number is defined based on the root-mean-square (r.m.s) horizontal velocity and the integral length scale. A particular focus was paid to the turbulence characteristics for lowRel<150to investigate the minimum limit ofRelobeying the profiles of rapid distortion theory. The measurements taken at near base included the r.m.s turbulent velocities, evolution of isotropy, integral length scales, and energy

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Ou, Jin-Ping, Bo Wu, and T. T. Soong. "Performance Comparison of Passive Energy Dissipation Systems in Structural Applications – I: Linear Reference System." Advances in Structural Engineering 1, no. 4 (1998): 237–59. http://dx.doi.org/10.1177/136943329800100402.

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In this paper, an analysis is presented for the performance comparison of representative passive energy dissipation systems which have been developed and implemented in structures in recent years. They include viscous fluid dampers, viscoelastic solid dampers, metallic dampers, friction dampers, tuned mass dampers and tuned liquid dampers. A single-degree-of-freedom linear structural system is used as a standard reference system where ground excitations are simulated either as a white noise or a filtered white noise. The performance criteria are first established, followed by the formulation o

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Craik, Robert J. M. "The Effect of Design Changes on Sound Transmission through a Building." Building Acoustics 3, no. 3 (1996): 145–85. http://dx.doi.org/10.1177/1351010x9600300302.

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A statistical energy analysis model of a building was used to assess the effect of design changes on sound transmission. Systematic changes were made to the material properties (density, Young's modulus, Poisson's ratio and internal loss factor) and to the dimensions (thickness and room size). These changes resulted in a redistribution of the energy throughout the building causing the noise level to go up in some rooms and to go down in others. For each case examined it was found that the effect of several changes could be estimated from the sum of the individual changes. Thus a change of 20%

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Santo, H., P. H. Taylor, E. Carpintero Moreno, et al. "Extreme motion and response statistics for survival of the three-float wave energy converter M4 in intermediate water depth." Journal of Fluid Mechanics 813 (January 17, 2017): 175–204. http://dx.doi.org/10.1017/jfm.2016.872.

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This paper presents both linear and nonlinear analyses of extreme responses for a multi-body wave energy converter (WEC) in severe sea states. The WEC known as M4 consists of three cylindrical floats with diameters and draft which increase from bow to stern with the larger mid and stern floats having rounded bases so that the overall system has negligible drag effects. The bow and mid float are rigidly connected by a beam and the stern float is connected by a beam to a hinge above the mid float where the rotational relative motion would be damped to absorb power in operational conditions. A ra

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Chen, Shujun, Na Wu, Jun Xiao, Tianming Li, and Zhenyang Lu. "Expulsion Identification in Resistance Spot Welding by Electrode Force Sensing Based on Wavelet Decomposition with Multi-Indexes and BP Neural Networks." Applied Sciences 9, no. 19 (2019): 4028. http://dx.doi.org/10.3390/app9194028.

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Expulsion identification is of significance for welding quality assessment and control in resistance spot welding. In order to improve the identification accuracy, a novel wavelet decomposition and Back Propagation (BP) neural networks with the peak-to-peak amplitude and the kurtosis index were proposed to identify the expulsion from electrode force sensing signals. The rapid step impulse and resultant damping vibration of electrode force was determined as a robust indication of expulsion, and this feature was extracted from the electrode force waveform by seven-layer wavelet decomposition wit

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Samelson, R. M., D. B. Chelton, and M. G. Schlax. "The Ocean Mesoscale Regime of the Reduced-Gravity Quasigeostrophic Model." Journal of Physical Oceanography 49, no. 10 (2019): 2469–98. http://dx.doi.org/10.1175/jpo-d-18-0260.1.

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AbstractA statistical-equilibrium, geostrophic-turbulence regime of the stochastically forced, one-layer, reduced-gravity, quasigeostrophic model is identified in which the numerical solutions are representative of global mean, midlatitude, open-ocean mesoscale variability. Solutions are forced near the internal deformation wavenumber and damped linearly and by high-wavenumber enstrophy dissipation. The results partially rationalize a recent semiempirical stochastic field model of mesoscale variability motivated by a global eddy identification and tracking analysis of two decades of satellite

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RISSO, FRÉDÉRIC, and JEAN FABRE. "Oscillations and breakup of a bubble immersed in a turbulent field." Journal of Fluid Mechanics 372 (October 10, 1998): 323–55. http://dx.doi.org/10.1017/s0022112098002705.

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This work is an experimental study of the deformation and breakup of a bubble in a turbulent flow. A special facility was designed to obtain intense turbulence without significant mean flow. The experiments were performed under microgravity conditions to ensure that turbulence was the only cause of bubble deformation. A scalar parameter, characteristic of this deformation, was obtained by video processing of high-speed movies. The time evolution and spectral representation of this scalar parameter showed the dynamical characteristics of bubble deformation. The signatures of the eigenmodes of o

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Shringarpure, Mrugesh, Mariano I. Cantero, and S. Balachandar. "Dynamics of complete turbulence suppression in turbidity currents driven by monodisperse suspensions of sediment." Journal of Fluid Mechanics 712 (September 25, 2012): 384–417. http://dx.doi.org/10.1017/jfm.2012.427.

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AbstractTurbidity currents derive their motion from the excess density imposed by suspended sediments. The settling tendency of sediments is countered by flow turbulence, which expends energy to keep them in suspension. This interaction leads to downward increasing concentration of suspended sediments (stable stratification) in the flow. Thus in a turbidity current sediments play the dual role of sustaining turbulence by driving the flow and damping turbulence due to stable stratification. By means of direct numerical simulations, it has been shown previously that stratification above a thresh

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Brisset, J., T. Miletich, J. Metzger, A. Rascon, A. Dove, and J. Colwell. "Multi-particle collisions in microgravity: Coefficient of restitution and sticking threshold for systems of mm-sized particles." Astronomy & Astrophysics 631 (October 16, 2019): A35. http://dx.doi.org/10.1051/0004-6361/201936228.

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Context. The current model of planet formation lacks a good understanding of the growth of dust particles inside the protoplanetary disk beyond mm sizes. A similar collisional regime exists in dense planetary rings. In order to investigate the low-velocity collisions between this type of particles, the NanoRocks experiment was flown on the International Space Station (ISS) between September 2014 and March 2016. We present the results of this experiment. Aims. The objectives of our data analysis are the quantification of the damping of energy in systems of multiple particles in the 0.1–1 mm siz

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Kemp, Connor, and Gary Scavone. "Microstructure Contributions to Vibrational Damping and Identification of Damage Mechanisms in Arundo Donax L: Reed Cane for Woodwind Instruments." MRS Advances 2, no. 35-36 (2017): 1869–88. http://dx.doi.org/10.1557/adv.2017.223.

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ABSTRACTNatural cane reeds (Latin name Arundo Donax L and here termed ADL) have been used on woodwind instruments for centuries with little change. The reed acts as a mechanical valve controlling the energy input into the musical instrument and it is the musician’s first option for altering the instrument’s sound and response characteristics. Despite this, their consistency, variable performance, durability and sensitivity to ambient conditions make it difficult for the musician to find and maintain a reed that responds to their liking. Thus it is desirable to examine the material, microstruct

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Le Bot, Alain. "Entropy in statistical energy analysis." Journal of the Acoustical Society of America 125, no. 3 (2009): 1473–78. http://dx.doi.org/10.1121/1.3075613.

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Du, W., H. F. Wang, P. Ju, and R. Dunn. "Damping torque analysis for DC bus implemented damping control." European Transactions on Electrical Power 20, no. 3 (2010): 277–89. http://dx.doi.org/10.1002/etep.310.

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Jiao, Fujun. "Oil damping energy loss analysis of landing gear shock absorber." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 8 (2018): 3096–106. http://dx.doi.org/10.1177/0954410018793788.

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It is seen that previous research on falling vibration of landing gear only provides work–stroke diagram and damping force value. Nevertheless, the change process of buffering medium at a micro-level is yet to be analyzed. The velocity, pressure, and their change over time of fluid particle are rarely researched in reality. To improve the intuitive, concreteness, and accuracy of the falling vibration analysis, this paper uses theoretical calculation and simulation to analyze oil damping energy loss of shock absorber. On the basis of theoretical calculation, the paper provides a feasible soluti

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YOO, JIN-HYEONG, and NORMAN M. WERELEY. "NONDIMENSIONAL ANALYSIS OF ANNULAR DUCT FLOW IN MAGNETORHEOLOGICAL/ELECTRORHEOLOGICAL DAMPERS." International Journal of Modern Physics B 19, no. 07n09 (2005): 1577–83. http://dx.doi.org/10.1142/s021797920503061x.

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Approximate analytical expressions describing MR/ER damper performance for an axisymmetric annular duct under the assumption of uniform field are presented. The key performance metric is the damping coefficient, which is the ratio of the equivalent viscous damping constant, Ceq, to the Newtonian viscous damping constant, C. To develop these approximations, a quadratic equation was used to approximate the center of the plug location in the annular duct. This equation simplified the calculation of the annular duct solution without resorting to numerical methods to solve the boundary value proble

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