A more accurate dynamic model for dual-side excitation large vibrating screens

Peng, Liping; Fang, Runxin; Feng, Huihui; Zhang, Lei; Ma, Wenda; He, Xiaodi

doi:10.21595/jve.2018.18811

Cited by 9 publications

(5 citation statements)

References 14 publications

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“…The accuracy of the method is verified by a three-degree-of-freedom (3-dof) dynamic model and a suitable vibration test. 5 Chandravanshi and Mukhopadhyay studied the variations in dynamic behavior of vibratory feeder with different stiffness, using FEM and EMA methods. 6 Gao presented an equation considering the compound pressure of the damper for evaluating the deformation magnitude of the damping springs, in a new 1-dof resonance device, so as to obtain more advanced sports performance.…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling and experimental testing analysis of Assembled Rubber Metal Isolator

Liu

Hua

et al. 2020

Science Progress

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In order to analyze the stiffness characteristics of Assembled Rubber Metal Isolator (ARMI) more accurately, the present work elaborates on the detailed numerical modeling and analysis process of the ARMI, considering prestressing condition. By comparing the applicability of different constitutive models, the reasonable parameters of the proposed Money-Revlon constitutive model were determined by rubber compression test and least square method. Considering the structural characteristics and complex constraints of the isolator, a step-by-step analysis method is described, based on the rigid-flexible coupling theory and the contact cutting algorithm. The full Newton-Raphson algorithm is used to simulate the mechanical behavior of elastic components in ARMI, during the whole compression-torsion deformation process, while the results are verified by theoretical calculation and practical experiments, respectively. For the assembly process, the maximum relative error between numerical results and empirical formulas is 3.97%. The derived torsional curve, under the simulated pre-stress conditions, is in good agreement with the experimental results, and the maximum error is less than 8.43%. The achieved accuracy is significantly improved, compared to the existing simulation model that does not consider the pre-compression process. The proposed approach provides an effective method for the analysis of same type vibration isolator.

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Section: Introductionmentioning

confidence: 99%

Numerical modeling and experimental testing analysis of Assembled Rubber Metal Isolator

Liu

Hua

et al. 2020

Science Progress

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“…Then, dynamic characteristics of the screen body are probed by solving vibration differential equations of the screen system, which are established based on the vibration theory [4], [5]. Considering degrees of freedom in the translation and rotation, 1-DOF [6], uncoupled 2-DOF [7], coupled 3-DOF [8]- [10] and spatial 3-DOF model [11]- [13] are adopted. From the standpoint of engineering applicability, the 2-DOF model is the most commonly implemented one in dynamic analyses.…”

Section: Introductionmentioning

confidence: 99%

Viscoelasticity of Rubber Springs Affects Vibration Characteristics of a Flip-Flow Screen With the High G Value

et al. 2020

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With the high G value of vibration, outstanding sieving behaviors of a flip-flow screen are more likely to appear, but structural damages are aggravated under the high amplitude vibration. Considering rubber springs role on the vibration energy dissipation, viscoelasticity of rubber springs (i.e., shear springs and vibration isolation springs), is noticed to deal with the above contradiction. However, when rubber springs experience large amplitude vibration, viscoelastic responses influence more on the amount of damping than in the linear (i.e., small amplitude) vibration regime, as the frequency dependence of rubber springs is noteworthy. For this purpose, the Generalized Maxwell model is used to depict the frequency dependence of rubber springs and the practical damping is converted to a series damping parameters of the system, numerical models of the flip-flow screen under startup and shutdown modes and steady working conditions are proposed and verified firstly. Secondly, in order to explore kinetics responses of the elastic screen panel under different rubber springs damping coefficients, nonlinear finite element model of which is established. Finally, effects of rubber springs nonlinear damping on screen frames vibrations and screen panels nonlinear responses are studied. Results indicate that hysteretic damping of rubber springs can effectively solve the conflict between vibration strength and structural reliability of the flip-flow screen, since the low sensitivities of maximum stresses and the high sensitivities of accelerations to rubber springs damping are found.

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“…• Desliming and dewatering in the coal beneficiation industry Among different kinds of static and moving classification machines, vibrating screens are the most frequently applied devices to sieve and sort a mineral particulate feed with a wide size distribution into two or more closely-sized products depending on the process requirements (Kelly and Spottiswood, 1982;Wills and Napier-Munn, 2007;Peng et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…The effect of operating parameters, including load amplitude (Michalczyk and Cieplok, 2016;Jiang et al, 2017), feeding conditions (Michalczyk et al, 2017), screen structure (Zhang et al, 2017;Zhou et al, 2019), and vibration characteristics (Xiong et al, 2017) on the sorting performance of vibrating screens have also been examined. Recently, Peng et al (2018) studied a more accurate dynamic model for dual-side excitation large vibrating screens. They proposed an elastic compression bar model method for transverse stiffness determination of a metal cylindrical coiled spring and provided guidance for the design of high-performance large vibrating screens.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis of a dashpots equipped vibrating screen using finite element method

Khoshdast¹,

Khoshdast²,

Jalilifard³

2020

Physicochem. Probl. Miner. Process.

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Even though vibrating screens have been used in mining industries for over a century, their use has often been cited as challenging in terms of understanding its dynamic responses to different operating factors, particularly those that affect the structural aspects. Among the various aspects of screen design, the control of vibrational energies imposed on various parts of the screen is of particular importance because these vibrations directly affect the separation efficiency and useful life of the screen. This study proposes the use of vibration absorbers to control the adverse effects of severe screen vibrations. The dynamic behavior of a medium-sized vibrating screen utilized in the aggregate industry was investigated using the finite element method for both spring/dashpots and conventional solely spring systems. The modeling process was performed in loaded and unloaded conditions and in three frequencies of 15, 23, and 27 rad/s. Numerical simulation results showed that the use of dashpots can significantly reduce the maximum stress in the screen, such that the maximum stress in the center of gravity of the screen at the optimal frequency of 23 decreased from 237 to about 97 MPa. Also, sieve modal analysis showed that the stress in the sieve equipped with the spring/dashpots system had a more uniform distribution. The results revealed that the use of vibration absorbers can be a promising solution to prevent damage caused by high vibrational energies in screens.

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A more accurate dynamic model for dual-side excitation large vibrating screens

Cited by 9 publications

References 14 publications

Numerical modeling and experimental testing analysis of Assembled Rubber Metal Isolator

Numerical modeling and experimental testing analysis of Assembled Rubber Metal Isolator

Viscoelasticity of Rubber Springs Affects Vibration Characteristics of a Flip-Flow Screen With the High G Value

Dynamic analysis of a dashpots equipped vibrating screen using finite element method

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