Analysis of the vibration attenuation of rotors supported by magnetorheological squeeze film dampers as a multiphysical finite element problem

Ferfecki, Petr; Zapomźl, Jaroslav; Kozánek, Jan

doi:10.1016/j.advengsoft.2016.11.001

Cited by 32 publications

(21 citation statements)

References 12 publications

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“…Then cylinder shaft vibration amplitude and frequency can be used to evaluate the vibration state of tangential threshing cylinder. Bearing seat of shaft vibration amplitude and frequency used to reveal the vibration state of rotor were confirmed and applied by Ferfecki et al [31].…”

Section: Vibration and Frequencymentioning

confidence: 99%

Unbalanced Vibration Identification of Tangential Threshing Cylinder Induced by Rice Threshing Process

Tang

Zhang

Zhou

2018

Shock and Vibration

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Unbalanced vibration of tangential threshing cylinder increased the grain loss, shortened service life of the cylinder, and resulted in structural resonance during the rice threshing process. In this paper, the vibration amplitude and frequency of tangential threshing cylinder shaft were tested, and the vibration state of tangential threshing cylinder was identified. The restricted and working modalities of tangential threshing cylinder were solved by ANSYS software. Then, by comparing the resonance phenomenon between the inherent constraint frequency and the rotation speed frequency, the shaft vibration under the idle condition of tangential threshing cylinder was tested and analyzed. According to the axial vibration and axial trajectory of the cylinder, the inherent properties and characteristics of unbalanced vibration were revealed. Test results showed that when the tangential threshing cylinder was at idling and no-load state, the amplitude of vibration in the feed direction of straw flow was -0.049~0.060 mm, and the average vibration amplitude was 0.013 mm. As rice flowed along the tangential threshing cylinder, the vibration amplitude slightly increased. The trend and phase of each trajectory were similar, although the amplitude of each trajectory was different. The tangential threshing cylinder axis trajectory was flat oval. Unbalanced vibration was induced by the rice stalks in the concave gap.

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Section: Vibration and Frequencymentioning

confidence: 99%

Unbalanced Vibration Identification of Tangential Threshing Cylinder Induced by Rice Threshing Process

Tang

Zhang

Zhou

2018

Shock and Vibration

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“…The presence of direct force can be explained eg. by the cavitations but the mathematical model is more complicated (Ferfecki et al, 2007). The magnitude of the negative pressure for < < 2 is multiplied by a factor , therefore the total force is given by the sum of integrals (6) as follows ∫ (… )d 0 + ∫ (… )d 2 .…”

Section: Reynolds Equationmentioning

confidence: 99%

Calculation of the fluid force acting on the bearing journal in the steady-state position

2018

Engineering Mechanics

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The paper relates to the fluid forces acting on the journal of the slide bearing. These forces can be calculated using the Reynolds equation. The development of actively controlled journal bearings with piezoactuators requires the model of the controlled system in the form of formulas that allow respecting the influence of all parameters. The paper provides a simplified solution to the Reynolds equation that justifies the stiffness matrix in the equivalent model suggested by Muszynska with the use of springs and dampers.

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“…To discover the physical essence of flow of dynamical processes and to obtain data on the modes of dynamic loading of tooth gear, different approaches, based on developing and studying mathematical models of discrete and continuous systems, are used [8]. Modeling of dynamic processes in mechanical oscillatory systems and elastic environments are the focus of a number of publications [9][10][11][12][13][14][15].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…In paper [9], an analytical model based on the method of finite element together with the method of least squares was created to determine the dynamic forces in a rotor system. Article [10] explores the problem of dynamics for elastic media; in this case, dynamic coefficients of stress intensity are calculated as load frequency functions.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Development and application of computer model to study the modes of dynamic loading in mechanical oscillatory systems

Dyachenko

Chychuzhko

Al-Ammouri

2017

EEJET

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Analysis of the vibration attenuation of rotors supported by magnetorheological squeeze film dampers as a multiphysical finite element problem

Cited by 32 publications

References 12 publications

Unbalanced Vibration Identification of Tangential Threshing Cylinder Induced by Rice Threshing Process

Unbalanced Vibration Identification of Tangential Threshing Cylinder Induced by Rice Threshing Process

Calculation of the fluid force acting on the bearing journal in the steady-state position

Development and application of computer model to study the modes of dynamic loading in mechanical oscillatory systems

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