Techniques for Detailed Screening of Vibration Data
Many maintenance teams and service centers rely on vibration-based machine condition monitoring programs to maximize uptime and control maintenance costs. This places some of the responsibility for predicting machine failures on personnel who may be managing vibration data for hundreds of machines, sometimes in multiple facilities. …
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Influence of vibration mode on the screening process
The screening of particles with different vibration modes was simulated by means of a 3D discrete element method (3D-DEM). The motion and penetration of the particles on the screen deck were analyzed for linear, circular and elliptical vibration of the screen. The results show that the travel velocity of the particles is the fastest, but the ...
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Effects of open trench siding on vibration-screening effectiveness
The two-dimensional boundary element method in frequency domain is used to investigate the screening effectiveness of the open trench–wall barrier system on reducing vibration generated by a footing. Sheet piles or diaphragm walls are on both sides of the open trench as a vibration barrier in this study. The results showed that …
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Kinetic model of vibration screening for granular materials …
The aim of this work is to construct a novel BNN model to study the vibration screening kinetic of mixture materials, and further propose a method to determine the relationship between the BNN model coefficients and the structure and operation parameters of screening system. The basic idea includes the following aspects.
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A vibration-test-based calculation method of screening …
In order to obtain material mass load characteristics of a crank-link type flip-flow screen in the screening process, a vibration-test-based method is proposed. A complete dynamic …
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Research on the screening mechanisms of composite …
To strengthen the screening efficiency of traditional vibrating screens, a new type of vibrating screen, namely the composite vibrating screen, has been proposed based on the Lissajous vibration synthesis theory. The working principles of composite vibrating screens have been explained. Numerical simulations of the sieving processes for such …
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Numerical investigation on dynamic response of the
Revealed the effect of screening parameters on screen mesh local vibration. ... In this paper, based on the DEM-FEM co-simulation method, the effect of screening parameters on the dynamic response of the screen mesh is explored and the mechanism is revealed on the particle level. Firstly, a virtual experiment on a linear vibrating screen …
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Vibration Testing
Vibration testing is most commonly used for measuring the structural health of structures. In late 19th century, vibration/dynamic field tests were applied to different concrete structures [115]. Various researches used this method on bridges to assess their condition and structural health [115–124].
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Numerical Simulation and Optimization of Screening …
Vibrating flip-flow screens are widely employed in the deep screening processes of coal washing, solid waste treatment, metallurgy, and other fields, playing a crucial role in enhancing product quality and production efficiency. The screen surface and material movement of vibrating flip-flow screens are highly complex, and there is …
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Mining Screens, Separation and Vibration
Mining screens, classification and separation are integral to ore processing, metals and minerals extraction, and controlling the final product quality in any mining and processing operation. Adopting efficient screening and separation solutions can increase yield and productivity while reducing environmental impact and minimising ore ...
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Laboratory-scale validation of a DEM model of screening …
The DEM model for the screening process with a circular vibration motion is established and a series of simulations are conducted with the same conditions to those of laboratory experiments as listed in Table 2 for both spherical and non-spherical particles. The velocity of the particle on the screen deck is an important motion parameter, which ...
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(PDF) Dynamic Analysis Of Vibration Screen
The process of vibration compaction of a two-component system by the method of vibration screening was investigated; it was shown that a density of up to 83% of the theoretical value is obtainable. 2.
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Vibration Monitoring of Vibrating Screens
collecting vibration data on a vibrating screen, including signal processing techniques and the method in which data should be obtained. This method includes a checklist that can be used to make certain the screen is thoroughly evaluated. The article then describes examples of data obtained from screens operating in good and poor conditions.
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Vibration screening: A detailed study using image
This paper presents a study of the dynamics of the mixture on the screen during solid–liquid separation using vibration screening. The independent variables studied were g-force, volumetric concentration of solids in the feed, feed flow rate and inclination of the screen.
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The MFBD-DEM coupling simulation approach for the
Vibrating sieving is an established method for classifying materials, and Flip-Flow Screens are frequently used pieces of screening equipment [1,2,3,4].During sieving, the material often bonds and blocks the screen hole, which seriously affects the screening efficiency [5,6,7,8].Many scholars used the Flip-Flow Screen to address the issue of …
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Use of in-filled trenches to screen ground vibration due to …
In order to achieve the levels of ground vibration specified in standards, effective and efficient methods of screening the ground vibration is a growing concern. Ground vibration can be reduced by decreasing …
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Methods of Evaluating Vibration Induced Stress of Small …
The vibration induced fatigue failure of small-bore piping is one of the common causes of failure trouble at nuclear power plants. This failure used to be prevented by calculating and screening ...
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A Numerical Study on the Screening of Blast-Induced Waves …
Blasting is often a necessary part of mining and construction operations, and is the most cost-effective way to break rock, but blasting generates both noise and ground vibration. In urban areas, noise and vibration have an environmental impact, and cause structural damage to nearby structures. Various wave-screening methods have been …
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OVERALL VIBRATIONS: HISTORY AND PRESENT DAY …
The user of a vibration guideline is likely to be attracted to a screening method that is easy to use and interpret. Basing a guideline on single numbers at predefined test points makes it easy to ... When we started to assess overall vibration methods in preparation for writing Reference 1, it was assumed that the task would be simple. In fact ...
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Characteristics and efficiency of a new vibrating screen …
The dynamic process of material vibration screening was simulated using discrete element method (DEM). By comparing the similarity between the material distribution established using biological neural network (BNN) and that obtained using DEM simulation, the optimum coefficients of BNN model under a certain screening parameter …
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Particle Behavior and Aperture Optimization of Variable Vibration …
Recently, some novel screens were proposed based on the improved understanding of screening processes from particle-scale studies, one of which is the novel variable amplitude equal thickness vibration screen (VAETVS). This paper presents an investigation of using different aperture sizes to further optimize the VAETVS by the …
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Stability analysis of the screening process of a vibrating …
The research on the screening performance of material on VFFS is as important as its vibration stability. During the screening process, there were always some misplaced material existing in the oversized and undersized products, as shown in Fig. 10 (Yu et al., 2020). Download : Download high-res image (280KB) Download : Download …
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Screening Theory and Practice
Theory of Screening. The purpose of screening is to separate from a granular substance particles that are smaller than the screen opening from those that are larger. This is not …
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DEM simulation and experimental study on the screening …
In addition, considering the lack of studies about the elliptical vibration machine, we applied the discrete element method to simulate and analyze the elliptical vibration screening process in ...
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A review on the advanced design techniques and methods of vibrating
In reality, a large vibrating screen, which has a screen surface width of no less than 3.6 m and a screening area of no less than 20.0m 2, usually oscillates with extremely complex dynamic characteristics of the screen body [10, 11].As shown in Fig. 2 (b), generally, except for the dominated strong alternating load yielded by two box-type …
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Study on the dynamics characteristics and screening …
Screening operation is widely applied in metal metallurgy, mining, chemical industry, food processing, and public hazard treatment. 1–3 Vibration screen is a type of engineering machinery that completes the screening process and improves the screening efficiency. 4,5 With the reciprocating vibration of the screen mesh, the processes of …
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Effects of open trench siding on vibration-screening effectiveness
As shown in Fig. 2, a trench of depth d and width w is located at a distance l from a rigid surface footing subjected to a vertical time-harmonic load. Since vibration isolation by a trench is primarily achieved by screening the surface (Rayleigh) waves, the trench depth, embedded length, width, and distance of the trench are normalized with …
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Screening effect of pile rows for ground vibration induced …
This study aims to predict the screening efficiency of pile rows in transversely isotropic (TI) saturated soils for ground vibrations subjected to moving loads. First, based on the fundamental solutions of TI saturated media, the boundary element method (BEM) was adopted to derive the force-deformation equation of the soil-pile …
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Laboratory-scale validation of a DEM model of screening
In this work, a screening model for the vibrating screen was established based on the discrete element method. The screening process was simulated, and the screening efficiency could be obtained ...
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A review on the advanced design techniques and methods …
Screening performance and reliability of vibrating screen depend on three aspects. •. Kinetic properties of screen body by dynamic modeling are summarized. •. Screening …
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