Study on the lateral and torsional vibration of single rotor-system using an integrated multi-body dynamics and finite element analysis

Eisa, Abdelrahman I. A.; Li, Shusen; Helal, Wasim M.K.

doi:10.1177/1687814020968336

Cited by 5 publications

(1 citation statement)

References 24 publications

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“…During the past, a few decades back, the use of eddy currents for suppressing vibration purposes has been investigated and applied to braking systems, rotary machinery control, and structures. Eisa et al [7] provided a numerical method for predicting the lateral vibrations; this method is an integration of both finite element method and multibody dynamics to be used for studying the damping force. MacLatchy et al [8] established a magnetic braking experiment to calculate and measure both the magnetic forces and terminal velocity.…”

Section: Introductionmentioning

confidence: 99%

Transient Analysis Method of an Axially Magnetized Novel Passive Eddy Current Damper for Suppressing Lateral Vibrations

Eisa

Zhang

et al. 2022

Mathematical Problems in Engineering

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A passive eddy current damper (PECD) can be adopted to provide a damping effect and drag force in rotating structure applications. The damping effect is formed as the result of induced eddy current, while the drag force is produced as the result of the repulsive force between the same axially poled magnets. However, modeling and approximating the damping effect, repulsive force, stiffness, the magnetic flux density (MFD) distribution, and eddy current prompted in PECD is a challenging task because of the complicated structure and operational conditions. This paper presents a new method for modeling and estimating the dynamic parameters of novel PECDs such as the damping effect, repulsive force, and stiffness for suppressing vibration in rotating structure applications. This self-powered, cost-effective PECD utilizes four arc-shaped and single ring-shaped permanent magnets with a cylindrical conductor placed between the arc magnets and the ring magnet to generate a damping effect and spring. Eddy currents are generated in the cylindrical conductor as the effect of the relative motion of the ring magnet concerning the arc magnets. An accurate and transient analysis method of the proposed system is carried out by using a three-dimensional finite-element method (3D-FEM). According to the procedures applied in the FE model solution, this new numerical method is appropriate and validated for analyzing PECDs and gaining good results by configuring the conductor and permanent magnets symmetrically. Finally, this novel 3D transient analysis method presents a perfect ability and accuracy for both modeling and calculating the PECD parameters.

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Section: Introductionmentioning

confidence: 99%

Transient Analysis Method of an Axially Magnetized Novel Passive Eddy Current Damper for Suppressing Lateral Vibrations

Eisa

Zhang

et al. 2022

Mathematical Problems in Engineering

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Dynamics analysis of the nonlinear rotor system with Geislinger coupling

Wang¹,

Li²,

Li³

et al. 2023

Vib. proced.

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Rotor systems with coupling consist of two rotors, rolling bearings, sealing components, and nonlinear coupling. Currently, rotor systems with coupling are widely used in marine engines, aerospace engines, and various vehicle engines. In studies of rotor systems with coupling, the coupling connecting both sides of the rotor are often regarded as a linear stiffness unit. But in actual engineering, the torsional stiffness of the coupling varies with the speed of the system, and the variation of the coupling stiffness will affect the dynamic characteristics of the rotor. Based on the above phenomena, this study establishes the rotor model of driveshaft-Geislinger coupling-driveshaft in diesel engines and obtains the modal, frequency, and transient response analysis results of the rotor system with nonlinear Geislinger coupling. The modal, frequency, and transient response analysis results of the nonlinear model are compared with those of the linear model. This study can provide theoretical support for the vibration analysis of nonlinear rotor systems with connected Geislinger coupling.

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Effect of Disc Offset Distance on Transverse and Torsional Vibration of Rotor Shaft

Jamadar,

Samal,

Jamadar

2023

Intelligent Technologies for Scientific Research and Engineering

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Vibrations play a very important role in rotor systems. In the manufacturing of the rotor system, the imbalance caused by the offset impeller and eccentricity produces unwanted vibrations. Various studies were carried out on unbalanced factors of rotor systems like eccentricity, crack, etc. But the effect of impeller offset due to manufacturing fault is not given much attention. In this study, the change in natural frequencies with respect to disc offset distance was calculated using numerical analysis and experimental analysis for the steel Jeffcott rotor system. Finite element analysis of the offset rotor shaft is carried out in the ANSYS workbench. Experimental modal analysis is carried out using the DAQ system. The accuracy of the model and the solution technique has been observed by comparing experimental results with the numerical simulation results from ANSYS. It is observed that when the disc is shifted from the center, it has a significant effect on transverse and torsional vibrational frequencies. As the disc is shifted towards bearing supports, the stiffness of the system increases, which leads to an increase in vibration frequency.

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Study on the lateral and torsional vibration of single rotor-system using an integrated multi-body dynamics and finite element analysis

Cited by 5 publications

References 24 publications

Transient Analysis Method of an Axially Magnetized Novel Passive Eddy Current Damper for Suppressing Lateral Vibrations

Transient Analysis Method of an Axially Magnetized Novel Passive Eddy Current Damper for Suppressing Lateral Vibrations

Dynamics analysis of the nonlinear rotor system with Geislinger coupling

Effect of Disc Offset Distance on Transverse and Torsional Vibration of Rotor Shaft

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