تعتبر شركة Olux شركة رائدة ومتميزة على المستوى الدولي في مجال البحث والتطوير وتصنيع وبيع محطات التكسير والغربلة واسعة النطاق ومعدات الطحن الصناعية ومصانع الاستفادة.
Fattah et al. [13] examined the resistance of pile foundation in dry sand subjected to pure vertical vibration and observed an increase in the skin friction resistance mobilization along the pile ...
WhatsApp: +86 18221755073
It can be concluded that vertical vibrations close to 5 Hz can cause more damage to the lumbar spine than vibrations at other frequencies, increasing the risk of lumbar spine diseases. Therefore, appropriate measures should be taken to reduce or avoid the adverse effects of long-term exposure to whole-body vibrations at resonant frequencies on ...
WhatsApp: +86 18221755073
a detailed study has been made of the factors contributing to densification of dry sand on a shaking table. THE VARIABLES CONSIDERED WERE THE FREQUENCY OF VIBRATIONS, …
WhatsApp: +86 18221755073
Structural vibration can be a problem with most machines, particularly with vertical turbine pumps. These pumps are commonly suspended from the discharge elbow with the motor mounted above, making them difficult to stiffen and damp. With low stiffness and damping, natural vibration frequencies in the machine operating range are inevitable, as well as reliability issues …
WhatsApp: +86 18221755073
The fundamental understanding of the behaviour of dry sand as it is being vibrated is necessary to properly address a number of engineering issues, such as the vibrocompaction process. The present paper first summarizes experimental works focusing on the effects of vibrations on the volume change of dry cohesionless soils. Original experiments characterizing …
WhatsApp: +86 18221755073
In order to investigate the influence of the vertical vibration loading on the liquefaction of saturated sand, one dimensional model for the saturated sand with a vertical vibration is presented based on the two phase continuous media theory. The development of the liquefaction and the liquefaction region are analyzed. It is shown that the vertical vibration loading could induce …
WhatsApp: +86 18221755073
Unlocking the Secret: Separating Gold from Sand at Home. Panning, sluicing, and shaking tables rely on surface tension, gravity, and vibration to separate gold from sand. As the sand and …
WhatsApp: +86 18221755073
The vertical vibration analysis of a pile embedded in soil has been applied in machinery foundations, structures exposed to seismic excitation and dynamic pile testing. In past several decades ...
WhatsApp: +86 18221755073
Vertical vibration of end-bearing single piles in poroelastic soil considering three-dimensional soil and pile wave effects. ... In the laboratory tests, in-situ sand samples that avoid slipping loss of corner debris are obtained and adopted. During DEM simulations, the cluster method is adopted with the linear parallel bond model. ...
WhatsApp: +86 18221755073
The presence of a rigid base at shallow depth increases the stiffness of the overlying soil stratum affecting the resonant frequency and the corresponding displacement amplitude of the foundation-soil system. Further, infiltration of water to such deposits makes the overlying soil to become saturated and adds to the complexity of the problem. Vertical vibration tests were conducted …
WhatsApp: +86 18221755073
Sand deposit vibration is a complex phenomenon, in which many parameters play an important role: amplitude, frequency and the number of vibration cycles, vibration source, distance from the source ...
WhatsApp: +86 18221755073
An approximate analytical solution is presented for the vertical dynamic response of a floating pile. The dynamic stiffness and damping of the soil-pile system are also obtained. The results are compared with experiments. It appears that the motion of the ...
WhatsApp: +86 18221755073
Furthermore, to suppress subway-induced vertical vibration and secondary air-borne noise inside buildings, the vertical stiffness of the sandbag isolator should be small and well designed. At the same time, the damping ratio should be high enough to reduce resonant amplitudes caused by low-frequency vibrations.
WhatsApp: +86 18221755073
However, the mechanism of sand motions around vibrating vertical flat plates under dry conditions presented in previous studies (Guan et al., 2022; Li et al., 2020; Yao et al., 2022; Zorzi et al., 2017) may not be applied to the saturated environment.It is unclear whether the same convective motions observed under dry conditions would occur under saturated conditions, …
WhatsApp: +86 18221755073
Goit and Saitoh [51] conducted uniaxial shake table tests on a 2 × 2 solid cylindrical acrylic pile group (all piles inclined at 0°, 5° and 10°) installed in a laminar shear box and found that the local nonlinearity of soil plays an important role in the lateral response of inclined pile groups. Subramanian and Boominathan [52] performed lateral dynamic tests on model pile …
WhatsApp: +86 18221755073
Vertical vibration capacity of a single pile in dry sand Mohammed Y. Fattah Department of Building and Construction Engineering, University of Technology, Baghdad, Iraq Correspondence myf_1968@yahoo
WhatsApp: +86 18221755073
A mathematical model presented in Fig. 1 is established to examine the vertical vibration of an end bearing pile interacting with the radially inhomogeneous saturated soil. The vertical exciting force, P 0 e i ω t, is acted on the head of the visco-elastic solid pile with a length of H p and a radius of r p. In practice, it can represent many ...
WhatsApp: +86 18221755073
This study presents novel research on the impact of vertical vibration on the dynamic response of pile groups embedded in stratified soil under seismic loading conditions. ... M. Y., Zbar, B. S., & Mustafa, F. S. (2017). Vertical vibration …
WhatsApp: +86 18221755073
the same horizontal and vertical frequency with a fixed phase difference, F › 0, between s hstd and s ystd. In the second set of experiments, v h and v y differed slightly, so that F varied in time. We used several materials, including roughly monodis-perse spherical glass beads, smooth nearly spherical Ot-tawa sand, and sieved rough sand ...
WhatsApp: +86 18221755073
The working mechanism behind the vertical vibration induced separation of sand and bronze particles was observed to be mainly convection driven. When the particle mixture was vertically vibrated ...
WhatsApp: +86 18221755073
In order to investigate the influence of the vertical vibration loading on the liquefaction of saturated sand, one dimensional model for the saturated sand with a vertical vibration is presented ...
WhatsApp: +86 18221755073
Paper No. SOSAB SETTLEMENTS OF SAND CAUSED BY VERTICAL VIBRATIONS: EXPERIMENTAL VERSUS NUMERICAL RESULTS Glenda ABATE 1, Maria Rossella MASSIMINO 2, Michele MAUGERI 3 ABSTRACT Soil vibrations ...
WhatsApp: +86 18221755073
been employed to investigate the behavior of vertically vibrating machines in sand [16-18] to study the behavior of vertical vibrations induced by machines in sand and closed-end pipe piles under seismic loads [19-21]. Experimental studies have also explored the dynamic response of single piles embedded in dry and saturated sandy soil subjected
WhatsApp: +86 18221755073
of saturated sand, one dimensional model for the saturated sand with a vertical vibration is presented based on the two phase continuous media theory. The development of the liquefaction and the lique- faction region are analyzed. It is shown that the vertical vibration loading could induce liquefaction.
WhatsApp: +86 18221755073
Vibratory response of floating pile foundations has recently been studied both analytically and experimentally (2,3,4,9, 10, 11). The methods used by Novak, et al., require making boundary condition and compatibility simplification assumptions whereas approximations to represent the semi-infmite half space are inherent in the finite element results of the writer.
WhatsApp: +86 18221755073
the vertical decay in the road. The vibration damping capacity of the reinforced aeolian sand roadbed is better than that of the gravelly soil roadbed; when replacing the gravelly soil roadbed ...
WhatsApp: +86 18221755073
You can indeed use vibration to separate particles of different densities. It works best if they are all pretty much the same size, so it will separate gold dust from dross if you grind and sieve the whole lot. A Chladni plate is a fine demonstrator but less efficient than a single …
WhatsApp: +86 18221755073
A study is reported in which the method of multiple scales is used to obtain an approximate analytical solution of the vertical vibration of foundations on soil. The study takes into account the nonlinearity of the soil structure, radiation, hysteretic and viscous damping, and the effect of embedment. Large responses of a foundation resting on a soil occur when the excitation …
WhatsApp: +86 18221755073
Piles are often used for the foundation of various structures, owing to their adaptability to geotechnical conditions and loading situations. Apart from studies on the performance of piles subjected to static loads, their response to dynamic loads has also attracted the attention of numerous researchers (e.g. Gazetas and Makris, 1991, El Naggar and Novak, …
WhatsApp: +86 18221755073
It is shown that the vertical vibration loading could induce liquefaction. The rate of the liquefaction increases with the increase of the initial limit strain or initial porosity or amplitude and frequency …
WhatsApp: +86 18221755073
Dynamic Response of Model Footings Resting on Finite Saturated Sand under Vertical Vibrations 702 center of gravity of whole system and that of the footing to lie in the same vertical line. A ...
WhatsApp: +86 18221755073
Therefore, the elastic half-space model of soil is introduced into the pile-soil dynamic vibration system to obtain the complex stiffness function of pile end soil and investigate the vertical vibration characteristics of floating piles (Muki and Sternberg, 1970, Zeng and Rajapakse, 1999; Emani and Mahsehwari, 2009; Shahmohamadi et al. 2011 ...
WhatsApp: +86 18221755073
EXPLORE GOLD OPEN ACCESS JOURNALS . Alternatively, you can explore our Disciplines Hubs, including: Journal portfolios in each of our subject areas. ... The modal superposition method was used to solve the vertical vibration equations for the rolls of a six-high rolling mill; thus, the natural frequencies and modal shapes for the rolls were ...
WhatsApp: +86 18221755073
Vertical vibration tests were conducted using model footings of different size and mass, resting on the surface of a finite sand layer with different height-to-width ratios, which was underlain either by a rigid concrete base or a natural red-earth base. Using the results of resonant frequency, the equivalent stiffness was obtained using the empirical equations available in the …
WhatsApp: +86 18221755073
Up to now, a variety of vibration control devices have been developed. Among them, the most widely applied device in engineering practice is the tuned mass damper (TMD) that consists of a mass block connected to the main structure through a spring and a dashpot [2], [3].The working principle of TMDs is simple: when the controlled structure resonates with the …
WhatsApp: +86 18221755073
of a strip footing under machine vibration. He found that the skirt 's effect in reducing the dynamic settlement was reduced by increasing the soil stiffness. The percentages of settlement decrease were between (2% 70%) for loose sand, (1% - - 68%) for medium sand, and (0.5% - 67%) for dense sand. Fattah et al. [1 4] analyzed a case of machine
WhatsApp: +86 18221755073