Study on the dynamics characteristics and screening …
In this work, the dynamic characteristics and screening performance of the disc spring vibration screen are studied. The modal simulation and experimental results show that the model vibration …
Modeling screening efficiency with vibrational parameters based …
Abstract. The efficiency of particle screening was studied over a range of vibrational parameters including amplitude, frequency and vibrational direction. The Discrete Element Method (DEM) was used to simulate the screening process. A functional relationship between efficiency and the parameters, both singly and combined, is …
Applied Sciences | Free Full-Text | Screening Mechanism and
Screening is the most fundamental technological process in coal preparation and metallurgy. In industrial practice, vibration screens are used for particle classification, dehydration, medium draining, and other operations [].Screening of fine wet particles by traditional screen devices is often not quite effective because of the existence of thin …
(PDF) Dynamic Analysis Of Vibration Screen
PDF | On Nov 1, 2015, Amey Kulkarni published Dynamic Analysis Of Vibration Screen | Find, read and cite all the research you need on …
Vibration isolation using open or filled trenches
The problem of structural isolation from ground transmitted vibrations by open or infilled trenches under conditions of plane strain is numerically studied. The soil medium is assumed to be linear elastic or viscoelastic, homogeneous and isotropic. Horizontally propagating Rayleigh waves or waves generated by the motion of a rigid foundation or by …
5 ways to reduce Vibration in Machines | Easyflex
This method of vibration reduction is based on a simple application of Netwon's 2nd Law which states that F = M a (where F= Force (N), M = mass (g), A = Acceleration (m/sec2). It implies that if the system's mass is increased while the force input remains constant – the acceleration (vibration response) of the system is reduced.
Dynamic Modeling of a Vibrating Screen Considering the Ore
Vibrating screens are critical machines used for size classification in mineral processing. Their proper operation, including accurate vibration movement and slope angle, can provide the benefits of energy savings and cost reductions in the screening process and the whole mining process. Dynamic models of the vibrating screen movement available in …
Dynamic design theory and application of large vibrating screen
Abstract. The reliability is a key factor for the design and manufacture of large vibrating screen. In the paper, we presented a new large vibrating screen with hyperstatic net-beam structure. Dynamic characteristic of the vibrating screen was researched and dynamic simulation method of large screening machines was explored.
Kinetic model of vibration screening for granular materials based …
Kinetic model of vibration screening using bio-inspired neural network is proposed. • Differential equation describing the neural dynamic characteristics is derived. • Relationship between actual screening parameters and model coefficients is established. • Feasibility …
Design and Efficiency Research of a New Composite Vibrating
A new composite vibrating mode is presented in this paper. Modeling and dynamic analysis are studied according to two-degree-of-freedom systems theory. The effects of vibration parameters, including swing angle, swing frequency, vibrating direction angle, and translation frequency, on the screening efficiency were researched by means …
Stepwise shape optimization of the surface of a vibrating screen
Screening is a technique that is extensively adopted for the separation of discrete materials according to particle characteristics such as size and shape. Wide application of the discrete element method has sparked much research on the vibrating screen, which is a screening apparatus having a specific vibration mode. The shape of …
Performance optimization of the elliptically vibrating screen with a
Chen et al. put forward a prediction method of screening efficiency based on the autoregressive (AR) model and the Least Square Support Vector Machine (LS-SVM) algorithm, the prediction results were proved to be in good agreement with the experimental data. ... Influence of vibration mode on the screening process. International Journal of ...
Research on the screening mechanisms of composite vibrating …
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 …
Vibrating Screen Working Principle
There is an advantage of using this method of vibration generation over the unbalanced flywheel method first mentioned. The vibration of an unbalanced flywheel is very violent. This causes mechanical failure and structural damage to occur. The four-bearing system greatly reduces this problem. ... A general rule of thumb for good …
Non-invasive assessment of vibration perception and protective
If using a tuning fork to test vibration perception then consider quantification using a graduated tuning fork or the conventional (on/off) method in place of the dampened method. The results of this study also indicate there is a need for regular and repetitive testing and that a combination of tests should be used for screening and monitoring ...
Modeling and parameter optimization for the design of vibrating …
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 …
A review on the advanced design techniques and methods of vibrating
For the clean and efficient utilization of coal, coal preparation is an important measure to solve the problem of air pollutant emissions, solid waste generation and save coal resources in the world [1, 2].Screening is the basic process for cleaning and efficient utilization of coal, and is mainly realized via vibrating screen [3].A conventional large …
Numerical Investigation on the Sieving Performance of Elliptical …
Screening techniques have been widely deployed in industrial production for the size-separation of granular materials such as coal. The elliptical vibrating screen has been regarded as an excellent screening apparatus in terms of its high screening efficiency and large processing capacity. However, its fundamental mechanisms and operational …
Stability analysis of the screening process of a vibrating flip-flow
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 …
Stability analysis of the screening process of a vibrating flip-flow
In this paper, the vibration stability of VFFS in the screening process and the influence of the change of VFFŚs dynamic response on the screening performance are investigated. The following conclusions can be drawn from this study. ... Flip-flow screening is an important method for classifying fine materials. Here, the flip-flow screening ...
Use of in-filled trenches to screen ground vibration due to impact …
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 dynamic loads from the …
Comparative study on the screening performance of a vibrating …
To address the problem of low screening efficiency during the FUM harvesting process, Song et al. [[4], [5], [6]] designed an FUM vibrating screening machine and analyzed the effects of the inclination angle, length of the screen surface, and the crank speed on the screening efficiency of the FUM.Ma et al. [7]designed an FUM harvester and studied the …
Simple tests to screen for diabetic peripheral neuropathy
There are two general methods: on‐off method and timing method (Perkins 2001). Graduated tuning fork . ... VibraTip is a pocket sized, wipe clean device to test vibration perception for routine screening of DPN . The product can overcome the limitations of using tuning forks by using a vibrating motor which provides consistent …
A vibration-test-based calculation method of screening material …
DOI: 10.1080/15567036.2020.1778139 Corpus ID: 225690191; A vibration-test-based calculation method of screening material mass of a mining crank-link type flip-flow screen @article{Wu2020AVC, title={A vibration-test-based calculation method of screening material mass of a mining crank-link type flip-flow screen}, author={Jida Wu …
Vibration screening: A detailed study using image
Vibration screening: A detailed study using image analysis techniques to characterize the bed behavior in solid–liquid separation. ... This paper proposes a broadband damping method to achieve broadband vibration absorption by superposition of the working bands of several damping units. The device composes of several local …
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 …
DEM simulation and experimental study on the screening
For an elliptical vibration system, the vibration parameters seriously affect conveying speed and sieving efficiency of the materials. 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 this paper. A …
Vibration screening: A detailed study using image
The design method and device proposed in this paper are expected to be widely used in the broadband low-frequency vibration suppression of various types of …
Dynamic influence of screening coals on a vibrating screen
Considering the s-dof vibration model, the corresponding linear vibration differential equation is m y ¨ + c y ̇ + ky = F 0 sin ω t [13], where m denotes vibrating mass of the screening system, c and k are the damping coefficient and the stiffness coefficient of the damping system, respectively, F 0 and ω are the maximum excitation load and ...
Optimization Research on Screening Parameters of Elliptical …
This optimization method is more accurate and effective than the previous method used to optimize the parameters of the vibrating screen. First, numerical …