Strain modal analysis and fatigue residual life prediction of vibrating screen beam

Zhang, Zerong

doi:10.21595/jme.2016.18113

Cited by 7 publications

(6 citation statements)

References 16 publications

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“…Such deformations are both quantifiable on the condition that the transverse stiffness and longitudinal stiffness are available. As the MCCS compression deformation is within 3-7 mm, namely, far less than free length of MCCS and in its linearly-deformed range, the transverse stiffness and longitudinal stiffness are supposed to be a certain constant value [3,5,8,9]. Since the dynamic equation governing DELVS system in Fig.…”

Section: Transverse Stiffness Of a Mccsmentioning

confidence: 99%

“…1(a), the most common unilateral-driven large vibrating screen has a large vibration mass and demands huge exciting force yielded by two box-type exciters. Due to the effect of coupled load consisting of the intense excitation load initiated by exciters, the inertial load of screen structure and the impact load of the screening materials, the dynamic characteristics of such large vibrating screen are extremely complex, and structural damage such as beam fracture or lateral plate crack occurs frequently [3][4]. Therefore, the low reliability and short service life of the equipment can hardly meet the demand for large-scale screening.…”

Section: Introductionmentioning

confidence: 99%

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

Peng¹,

Fang²,

Feng³

et al. 2018

J. vibroeng.

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Compared with a traditional unilateral-driven large vibrating screen, the proposed dual-side excitation large vibrating screen (DELVS) has a simpler screen structure and less vibration mass, which might improve its reliability. A DELVS with metal cylindrical coiled springs is theoretically and experimentally studied in this paper. With the rotation considered, a fundamental three-degree-of-freedom (3-DOF) dynamic model for DELVS is established firstly. Then an elastic compression bar model method (ECBM) is proposed for transverse stiffness determination of a metal cylindrical coiled spring and applied into the numerical simulation of DELVS. Finally, an experimental test on a DELVS of 4.25 m×6.00 m is conducted. It is seen that numerical simulation with the proposed ECBM is more closely related to the experimental data, hence the accuracy of the proposed dynamic model of DELVS is enhanced. The conclusions may provide guidance on a design of a high-performance large vibrating screen.

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Section: Transverse Stiffness Of a Mccsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Peng¹,

Fang²,

Feng³

et al. 2018

J. vibroeng.

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“…However, long-term alternating loads are highly likely to lead to spring failure through spring stiffness decrease [8], causing a negative influence on the mining vibrating screen. On one hand, spring cracks [9][10][11]. On the other hand, spring failures could produce a loss of particle separation efficiency, thus hardly meeting practical process demands [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…Numerical simulations were carried out, and the results showed that the proposed model is feasible. In addition, spring failure simulations were also carried out, and the results indicated that the x, y, and z direction amplitude change rules for all cracks [9][10][11]. On the other hand, spring failures could produce a loss of particle separation efficiency, thus hardly meeting practical process demands [12,13].…”

Section: Introductionmentioning

confidence: 99%

A Theoretical Rigid Body Model of Vibrating Screen for Spring Failure Diagnosis

et al. 2019

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Springs are critical components in mining vibrating screen elastic supports. However, long-term alternating loads are likely to lead to spring failures, likely resulting in structural damages to the vibrating screen and resulting in a lower separation efficiency. Proper dynamic models provide a basis for spring failure diagnosis. In this paper, a six-degree-of-freedom theoretical rigid body model of a mining vibrating screen is proposed, and a dynamic equation is established in order to explore the dynamic characteristics. Numerical simulations, based on the Newmark-β algorithm, are carried out, and the results indicate that the model proposed is suitable for revealing the dynamic characteristics of the mining vibrating screen. Meanwhile, the mining vibrating screen amplitudes change with the spring failures. Therefore, six types of spring failure are selected for simulations, and the results indicate that the spring failures lead to an amplitude change for the four elastic support points in the x, y, and z directions, where the changes depend on certain spring failures. Hence, the key to spring failure diagnosis lies in obtaining the amplitude change rules, which can reveal particular spring failures. The conclusions provide a theoretical basis for further study and experiments in spring failure diagnosis for a mining vibrating screen.

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“…Other research work depends on models generated from experimental data, such as model identification which is also a viable approach if the experimental data is reliable and it is free of stochastic noise components [1,2,4,19]. Other methods rely on finite element method to generate a working model of the structure which can lead to deficiencies in the model's ability to predict the behavior of the physical system, especially if the boundary conditions and the element type chosen for the FE model are not properly specified [10,20,21].…”

Section: Introductionmentioning

confidence: 99%

Relating structural damage to modal frequencies shift using low cost LQG-FEA approach and minimal feedback measurements

Ghailani¹,

El-Sinawi²

2017

J. vibroeng.

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Vibration signature of flexible structures can be used as a tool to monitor the structural health and predict failure. This work presents a practical low cost technique for predicting vibration signature of a mechanical structure and relates it to its structural health. The technique utilizes a model constructed from Modal frequencies and Eigen vectors obtained via finite element analysis (FEA) of the structure. Linear Quadratic Gaussian (LQG) servo controller of the acceleration output of the model is utilized to minimize error between actual acceleration measurements and its estimates. The LQG controller requires minimal feedback measurements from the physical system and can provide acceleration estimates at any location on the structure. Thus, it is adaptable to structures that are complex and/or have limited accessible measurements points. Anytime during operation, a shift in estimated Modal frequencies of the structure is shown to have a strong relationship with variation in structural parameters, (i.e. structural damage). Therefore, the presented technique is unique for three reasons, (a) it uses estimates, rather than actual measurements to identify structural damage, (b) requires minimal feedback measurements from the structure and (c) uses an effective low-cost reduced order model to achieve (a) and (b). The proposed technique is utilized on a pipeline structure and is evaluated both numerically and experimentally as a proof of concept. Research outcomes are presented and discussed.

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Strain modal analysis and fatigue residual life prediction of vibrating screen beam

Cited by 7 publications

References 16 publications

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

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

A Theoretical Rigid Body Model of Vibrating Screen for Spring Failure Diagnosis

Relating structural damage to modal frequencies shift using low cost LQG-FEA approach and minimal feedback measurements

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