Study on vertical vibration and transmission characteristics of railway ballast using impact hammer test

Liu, Ganzhong; Cong, Jianli; Wang, Ping; Du, Shanshan; Wang, Li; Chen, Rong

doi:10.1016/j.conbuildmat.2021.125898

Cited by 15 publications

(2 citation statements)

References 42 publications

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“…Bench testing avoids the interference of unknown factors during field testing and facilitates the consistency of the test conditions. Liu et al [17] constructed a ballast sensor by embedding a chip and built an impact hammer test rig to analyze the effect of vertical vibration and transmission characteristics of the ballast on the dynamic stability of railway track structures. Zhang et al [18] used a support platform, hammer, and an acceleration sensor to build a large cabbage vibration test bench and used stepwise multiple linear regression methods to quantitatively and qualitatively analyze the cabbage quality.…”

Section: Introductionmentioning

confidence: 99%

Vibration Response of Soil under Low-Frequency Vibration Using the Discrete Element Method

Wan,

Li,

Song

et al. 2023

Agriculture

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The vibration response of soil is a key property in the field of agricultural soil tillage. Vibration components of tillage machinery are generally used to reduce tillage resistance and improve work efficiency, and the pressure variation under low-frequency vibration will affect the fragmentation and dispersion of farmland soil. However, the gradient of pressure variation, frequency domain response, and effective transmission range is unclear. A new method based on the DEM (discrete element method) is presented to study the vibration response and pressure transmission under low-frequency vibration. Bench test results have shown that peak pressure positively correlates with the vibration frequency and attenuates rapidly at a vibration distance of 100 to 250 mm. The resulting data were also selected to determine the simulation model’s parameters. Amplitude, vibration frequency, and soil depth were used as test factors in single-factor simulation tests, and their effects on the peak pressure, frequency domain response, and effective transmission distance were analyzed. The results showed a positive relationship between the peak pressure and the test factors. The peak pressure increased with a maximum gradient of 19.02 kPa/mm at a vibration distance of 50 mm. The amplitude, vibration frequency, and soil depth positively correlated with the dominant frequency amplitude. The main frequency was independent of amplitude and soil depth. At a vibration distance of 250 mm, the dominant frequency was approximately twice the vibration frequency at 7–11 Hz and approximately equal to the vibration frequency at 13–15 Hz. Multiple exponential functions were used to fit the peak pressure attenuation function, obtaining an effective transmission distance range of 347.15 to 550.37 mm for the 5 kPa cut-off pressure. For a soil depth of 300 mm, the vertical shear wave diffusion angle was greater than the horizontal shear wave diffusion angle. This study clarifies the vibration response of soil under low-frequency vibration, which helps to design vibration-type, soil-engaging components of tillage machinery and match vibration parameters for energy-saving and resistance reduction purposes in soil tillage.

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Section: Introductionmentioning

confidence: 99%

Vibration Response of Soil under Low-Frequency Vibration Using the Discrete Element Method

Wan,

Li,

Song

et al. 2023

Agriculture

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“…[7] Other researchers prefer to compare the values of loss tangent at the common temperature of "zero" to find out the desired oil in terms of the frictional properties. [8][9][10] However, it must not be forgotten that choosing the temperature of zero as a point of comparison is based on several assumptions that have to be preliminarily met. It is generally accepted that bulk hysteretic energy dissipation under dynamic high-frequency deformations is responsible for wet-sliding friction.…”

Section: Introductionmentioning

confidence: 99%

Wet Friction of Rubbers Containing DAE or TDAE Process Oil in ESBR and ESBR/BR Blends

Shahdehi

Alimardani

Roshanaei³

2022

Macromolecular Symposia

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The inevitable need to replace conventional high aromatic process oils with new safe ones has made it critically important to investigate the extent of tire wet grip modification by process oils’ aromatic content. Here, direct measurement of wet friction is conducted on emulsion styrene butadiene rubber (ESBR) and ESBR/butadiene rubber (BR) rubber blends containing either safe treated distillate aromatic extract (TDAE) or the conventional distillate aromatic extract (DAE) oils. Interestingly, the results reveal that the wet coefficient of friction for rubbers with TDAE is comparable or even better than rubbers with the DAE. This stands in contrast with previous predictions founded on indirect methods such as the values of loss factor tan δ at 0°C. Analysis of temperature dependent dynamic properties exhibits similar values of tan δ at 0°C for two oil types; however, a higher level of loss tangent for TDAE is found near the glass transition temperature. It is hypothesized that the frequency of loading imposed by the microtexture of the concrete counterface may have dictated the temperature range in which the TDAE can surpass the DAE in terms of the wet grip performance. The difference in the wet grip of rubbers having two oils is more pronounced for the ESBR/BR blend system.

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Experimental Studies of Statistical Diagnostics Information and Measuring Systems

Babak,

Zaporozhets

2024

Studies in Systems, Decision and Control

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Study on vertical vibration and transmission characteristics of railway ballast using impact hammer test

Cited by 15 publications

References 42 publications

Vibration Response of Soil under Low-Frequency Vibration Using the Discrete Element Method

Vibration Response of Soil under Low-Frequency Vibration Using the Discrete Element Method

Wet Friction of Rubbers Containing DAE or TDAE Process Oil in ESBR and ESBR/BR Blends

Experimental Studies of Statistical Diagnostics Information and Measuring Systems

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