Electromechanical coupling dynamic modeling and analysis of vertical electrodynamic shaker considering low frequency lateral vibration

Abstract

For the problem of relatively severe lateral vibration found in the vertical electrodynamic shaker experiment, an electromechanical coupling dynamic model of the electrodynamic shaker considering low-frequency lateral vibration is proposed. The reason and mechanism of the lateral vibration is explained and analyzed through this model. To establish this model, an electromagnetic force model of overall conditions is firstly built by fitting force samples with neural network method. The force samples are obtained by orthogonal test of finite element simulation, in which five factors of the moving coil including current, vertical position, flipping eccentricity angle, radial translational eccentric direction and distance are considered. Secondly, a 7-dof dynamic model of the electrodynamic shaker is developed with the consideration of the lateral vibration of the moving system. To obtain the transfer function accurately, the stiffness and damping parameters are identified. Finally, an electromechanical dynamic model is established by coupling the force model and the 7-dof dynamic model, and it is verified by experiments. The coupling model proposed can be further used for the control and optimization of the electrodynamic shaker.

Analysis of the influence of shaker table rigidity on the accuracy of vibration test results for electronic equipment

“…This has prompted many researchers to further investigate vibration transmission models during testing. [9][10][11][12][13].…”

“…The work [10] shows the principle mechanical and electrical parts of a lumped-parameter, one-dimensional, three DoFs, electromechanical shaker model and describes a basic model of a Modal shaker. It was shown in [11,12] that due to the unbalanced radial electromagnetic force and the displacement of the center of gravity of the tooling or test sample, in practice, an electrodynamic shaker can generate significant vibration in the transverse direction. As a result, the accuracy of vibration control of the equipment under test is greatly reduced.…”

“…As a result, the accuracy of vibration control of the equipment under test is greatly reduced. To take into account the lateral vibration of the moving system, a dynamic model of an electrodynamic shaker with 7 DOF was developed in [11].…”