Numerical simulation of vibration damping by granular materials

Takeshima, Masao; Asakura, Takumi

doi:10.1016/j.apacoust.2019.107189

Cited by 7 publications

(4 citation statements)

References 31 publications

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“…However, the comparison results showed that even with this slight difference, the model established in this paper could grasp the intrinsic dynamic properties of the ballasted track system and showed good agreement with the test results. Future possible solutions can be achieved by carrying out simulations based on the discrete element method [35,36].…”

Section: Discussionmentioning

confidence: 99%

Vibration Reduction in Ballasted Track Using Ballast Mat: Numerical and Experimental Evaluation by Wheelset Drop Test

Wang

Chen

et al. 2022

Applied Sciences

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Ballast mats are considered as an effective solution for reducing vehicle-induced vibrations. However, the research on the vibration characteristics of each part of the ballasted track with a ballast mat is limited. In this study, the ballast mat vibration reduction effects are evaluated by numerical and experimental analysis using wheelset drop tests. A three-dimensional model consisting of a wheel, track and the contact between them is built using a rigid–flexible coupling method. The accuracy of the numerical model is verified by comparison with the finite element model in terms of the track receptance and phase angle. Comparisons show that the proposed model is in good agreement with the finite element model, which allows validating the flexible-body model. Moreover, the track dynamic performance in the presence and absence of the ballast mat is studied with the wheelset drop tests in both time and frequency domains. The results from the wheelset drop excitation tests show that the use of the ballast mat decreases the mid- and high-frequency track vibration by 13–17 dB but increases the low-frequency track vibration by 5–15 dB.

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Section: Discussionmentioning

confidence: 99%

Vibration Reduction in Ballasted Track Using Ballast Mat: Numerical and Experimental Evaluation by Wheelset Drop Test

Wang

Chen

et al. 2022

Applied Sciences

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“…where k S is the difference of k in a shear wall building and in a frame building. k S can be calculated by equation (10) according to the linear fitting results in Figure 6.…”

Section: A Prediction Model Of Vl Z Induced By the Impulsive Vibratio...mentioning

confidence: 99%

“…Thus, the influences of building structural parameters on vibration transmission cannot be studied quantitatively through tests. Numerical calculation methods, such as the finite element method, boundary element method, and finite difference method, [10][11][12] can more accurately simulate the vibration responses of structures in buildings. Under an exciting force, such as human walking and running, long span or slender floors would be more susceptible to vibration.…”

Section: Introductionmentioning

confidence: 99%

The transmission characteristics and influence prediction of impulsive vibration caused by a solid metal ball impact in buildings

Guo

Lin

2022

Journal of Low Frequency Noise, Vibration and Active Control

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The impulsive vibration induced by human running and jumping, object falling, striking during decoration, etc., significantly disturbs the learning, work, and life of people through building structure transmission. To study the influence of impulsive vibration in buildings, a vacant frame building was selected as a tested building. The vibration at each floor besides hitting spot would be measured when a solid metal ball falling freely hit the first floor of this building. The vibration response at each floor caused by the excitation above was simulated through a finite element method. The parameters of the simulation model were optimized according to measured results. Furthermore, the influence of building structure, the total amount of stories, and slab dimension on the transmission of vibration from 1 Hz to 80 Hz which can be perceived by human bodies was quantitatively studied. Results showed that the vertical weighted vibration acceleration level at each floor linearly decreased with the increase of the logarithm of the distance between each floor and the hitting spot. A prediction model of vertical weighted vibration acceleration level from 1 Hz to 80 Hz induced by the impulsive vibration in buildings was developed according to simulation results. The corrections relating to the number of story, building structure, slab span, slab length-to-width ratio, and slab thickness were respectively introduced in the model which can predict the vertical weighted vibration acceleration level at each floor above the hitting spot. The results of this study can provide a basis for the prediction and control of impulsive vibration caused by an impact source with great stiffness in buildings.

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“…There are many physical phenomena such as electromagnetics, structural vibration, acoustical propagation, ultrasonic cavitation, ocean wave propagation and fluid dynamics, which can be described via hyperbolic partial differential equations [1][2][3][4][5][6][7]. Formulating robust numerical schemes for solving hyperbolic equations are critical in simulating these complex phenomena, and it is still the interest of many researchers even today.…”

Section: Introductionmentioning

confidence: 99%

Comparative Review on Computational Performance of Multistep Schemes in Solving One-Dimensional Linear Wave Equation

Hayytov

Tey

Kang

et al. 2021

CFDL

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Among several numerical methods used to solve the hyperbolic model of the linear wave equation, single-step algorithms can be the more popular ones. However, these algorithms are time-consuming while incurring numerical inaccuracy. Thus, multistep methods can be a suitable option as it has a high order of accuracy. This study aims to investigate and compare the computational performance of these multistep schemes in solving hyperbolic model based on one-dimensional linear wave equation. The techniques studied in this paper comprise the two-step Lax-Wendroff method, MacCormack method, second-order upwind method, Rusanov-Burstein-Mirin method, Warming-Kutler-Lomax method, and fourth-order Runge-Kutta method. Finite difference method is applied in discretisation. Our simulation found that although higher-order multistep methods are more stable than single-step algorithm, they suffer numerical diffusion. The two-step Lax-Wendroff method outperforms other schemes, although it is relatively simple compared with the other three and four steps schemes. The second-order upwind method is attractive as well because it is executable even with a high Courant number.

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Numerical simulation of vibration damping by granular materials

Cited by 7 publications

References 31 publications

Vibration Reduction in Ballasted Track Using Ballast Mat: Numerical and Experimental Evaluation by Wheelset Drop Test

Vibration Reduction in Ballasted Track Using Ballast Mat: Numerical and Experimental Evaluation by Wheelset Drop Test

The transmission characteristics and influence prediction of impulsive vibration caused by a solid metal ball impact in buildings

Comparative Review on Computational Performance of Multistep Schemes in Solving One-Dimensional Linear Wave Equation

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