Preparation of Uniform Sand Specimens Using Stationary Pluviation and Vibratory Methods

Chennarapu, Hariprasad; Rajashekhar, M; Balunaini, Umashankar

doi:10.1007/s10706-016-0064-0

Cited by 40 publications

(20 citation statements)

References 27 publications

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“…% 100 (15) The content of the liquid phase and the dry component in brewer pellets passing through the curved blade: Whence taking into account the formulas (6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18), the mass of the outlet of the liquid part of the filtrate:…”

Section: Resultsmentioning

confidence: 99%

Separation of brewer pellets in a vibratory-centrifugal centrifuge

et al. 2020

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The article reflects the process of dehydration of brewer pellets, as one of the ways to solve the problem of their utilization in order to obtain a highly concentrated feed for farm animals, which is an urgent task. The purpose of the study is to substantiate the interrelation between the technological and physical properties of the brewer pellets during the separation of brewer pellets into dense and liquid fractions in a continuous vibratory-centrifugal centrifuge and its main design and operating parameters. As a result of the research with the analytical method, process and physical properties of brewer pellets are determined when they are interacting with the perforated rotor blades of a vibratory-centrifugal centrifuge. The equations for the yield of the liquid fraction of brewer pellets through the rectilinear and curvilinear rotor blades are obtained, indicating the interrelation between process and physical properties of brewer pellets, which are necessary for determining the rational basic parameters of the proposed vibratory-centrifugal centrifuge.

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Section: Resultsmentioning

confidence: 99%

Separation of brewer pellets in a vibratory-centrifugal centrifuge

et al. 2020

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“…Pluviation through air is the most preferred method for its similarity to natural sand in the deposition mode [42]. According to the research now available, when other conditions remain unchanged, the relative density of sand is positively correlated with the falling distance [43].…”

Section: Preparation Of the Sandmentioning

confidence: 99%

“…In this paper, an experimental equipment of stationary pluviation was made referring to Chennarapu's method [43]. As shown in Figure 5, this device consists of three layers of sieves.…”

Section: Preparation Of the Sandmentioning

confidence: 99%

Model Tests on the Frequency Responses of Offshore Monopiles

Zhu

2019

JMSE

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Monopiles are widely used to support offshore wind turbines as a result of the extensive development of offshore wind energy in coastal areas of China. An offshore wind turbine is a typical high-rise structure sensitive to dynamic loads in ocean environment such as winds, water waves, currents and seismic waves. Most of the existing researches focus on elastic vibration analysis, bearing capacity or cyclic degradation problems. There’re very few studies on vibration of monopiles, especially considering the influence of static loads with different amplitudes, directions, and loading-unloading-reloading processes. In this paper, laboratory-scale 1 g model tests for a monopile in dry sands were carried out to investigate the frequency responses of the monopile under different loading conditions. The bearing capacities of the model monopile were obtained as references, and dynamic loads and static loads with different amplitudes were then applied to the monopile. It was found that (1) the first resonant frequency of the monopile decreases with the increase of dynamic load amplitudes; (2) the first resonant frequency of the monopile steadily increases under the lateral static load and loading-unloading-reloading processes; (3) the frequency responses of the monopile with static loads in different directions are also quite different; (4) damping of the monopile is influenced by the load amplitudes, load frequencies, load directions and soil conditions. Besides, all the tests were conducted in both loose sand and dense sand, and the results are almost consistent in general but more obvious in the dense sand case.

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“…In previous studies, four methods have been used in order to evaluate the uniformity of sand specimens in the laboratory: miniature cone penetration testing (Walker and Whitaker 1967;Fretti et al 1995;Hsu and Huang 1999;Choi et al 2010; Dave and Dasaka 2012; Gade and Dasaka 2015), shear wave velocity method (Choi et al 2010), RD evaluation with depth using small containers placed at various locations throughout the pluviated depth (Lo Presti et al 1993;Choi et al 2010;Hariprasad et al 2016), and chemical impregnation (Schneider et al 1989;Sutterer et al 1996;Clayton et al 1994). Additionally, heat propagation within the specimen was assessed by measuring thermal conductivity/ resistivity to understand the uniformity of the sand specimens indirectly (Singh et al 1979;Bellotti et al 1991).…”

Section: Uniformity Testsmentioning

confidence: 99%

Comparison between Two Different Pluviation Setups of Sand Specimens

Tabaroei

Abrishami

Hosseininia

2017

J. Mater. Civ. Eng.

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Sand pluviation is a method used to prepare a model sand specimen to carry out some particular laboratory tests such as static and dynamic tests on footings, retaining walls, piles, as well as calibration of static and dynamic penetrometers. Preparation of uniform reconstituted sand specimens of required density is a prerequisite for obtaining reliable results. In this paper, two rainer systems, which are capable to prepare homogeneous sand specimens, are introduced. The first is a rainer system with a perforated plate and the second is a portable curtain rainer system. The portable curtain rainer system essentially consisting of a sand storage, flexible hose, a hopper, rigid tubes, and curtain with different opening widths. This study aims to reach a better understanding of the effects of deposition intensity (DI) and height of fall (HF) on the relative density (RD) of reconstituted sand specimens. The uniformity of the sand bed is verified by measuring the relative densities of 20 samples at different locations of the tank. By using a portable curtain rainer system, large uniform sand specimens with a wide range of RD ¼ 23-96% can be achieved. The results demonstrate that at a lower value of HF, the variation of RD is significant, while it has an insignificant effect on RD for values of HF ≥ 600 mm. Furthermore, in order to achieve a dense to very dense sand bed, the DI should be controlled. It was also observed that both systems significantly improve the horizontal and vertical homogeneities of the sand specimens. With an increase in the RD of reconstituted sand specimens, higher repeatability of uniform pluviation was achieved.

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Preparation of Uniform Sand Specimens Using Stationary Pluviation and Vibratory Methods

Cited by 40 publications

References 27 publications

Separation of brewer pellets in a vibratory-centrifugal centrifuge

Separation of brewer pellets in a vibratory-centrifugal centrifuge

Model Tests on the Frequency Responses of Offshore Monopiles

Comparison between Two Different Pluviation Setups of Sand Specimens

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