Damping Force Modeling and Suppression of Self-Excited Vibration due to Magnetic Fluids Applied in the Torque Motor of a Hydraulic Servovalve

[...]commercial applications of the squeeze mode are still restricted due to a lack of understanding and modeling of the material behavior, while further investigations still need to be carried out on the mathematical models of damping forces and resistance from magnetic fluids in the application of...

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Bibliographic Details
Published in:Energies (Basel) 2017-06, Vol.10 (6), p.749
Main Authors: Zhang, Wei, Peng, Jinghui, Li, Songjing
Format: Article
Language:English
Subjects:
Computational fluid dynamics
Computer simulation
Dampers
Damping
Engineering
Field strength
Fluids
Harmonic response
Hydraulics
Lubricants & lubrication
Magnetic fields
Magnetic fluids
Magnetic properties
Mathematical models
Noise
Nuclear power plants
self-excited noise
servovalve
Servovalves
Shear stress
torque motor
Torque motors
Vibration
Vibration control
Vibration isolators
Viscosity
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Summary:[...]commercial applications of the squeeze mode are still restricted due to a lack of understanding and modeling of the material behavior, while further investigations still need to be carried out on the mathematical models of damping forces and resistance from magnetic fluids in the application of vibration absorbers and dampers. [...]the aim of the paper is to build a mathematical model of damping force from magnetic fluids for vibration suppression in a torque motor, and to study the mechanism of operation mechanism of magnetic fluids in the squeeze mode, via simulation and experiment of the harmonic response of the armature with magnetic fluids. [...]the movement of the end of the armature can be regarded as a displacement along the direction of the magnetic field exerted inside the working gap, although the armature actually rotates when the electric current is supplied to the torque motor. Because of the property when exposed to a magnetic field, MF behaves very differently from normal fluids by changing its viscosity and shear stress remarkably and reversibly due to magnetic fields. [...]the viscosity of magnetic fluids exposed to a magnetic field may also change slightly with the variation of magnetic field strength. [...]in the future, a better understanding of the suppression mechanism will be needed to investigate the influence of variation in the magnetic field strength on the viscosity of magnetic fluids that varies with the magnetic field strength inside the working gaps of the torque motor.
ISSN:1996-1073
1996-1073
DOI:10.3390/en10060749