Magnetic levitation force exerted on the cylindrical magnet in a ferrofluid damper

Yang, Wenming

doi:10.1177/1077546315616516

Cited by 13 publications

(4 citation statements)

References 10 publications

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“…The choice of damping factor or damper in practical systems depends on the system's practical applications. Several dampers such as ferrofluid damper, viscous damper, viscoelastic damper, friction damper, eddy current damper and metallic damper were reported by various researchers such as Yu et al [60], Zhou et al [61], Constantinou et al [62], Ye et al [63], Jiao et al [64], Tsai et al [65], Javanmardi et al [66], etc Yang [67] suggested two different types of ferrofluid dampers that might be applied to reduce rotating machine vibration. The ferrofluid being studied has a better damping effectiveness, making it more effective going forward for suppressing system vibration [68], controlling vibratory motion like noise [69], and mechanical oscillation by dissipating energy [70,71].…”

Section: Damping Factor Analysismentioning

confidence: 99%

A trivalent ferrite ferrofluid compound’s rheological response to angular frequency, magnetic induction and shear induction of chain clusters

Abideen A,

Pant

2023

Phys. Scr.

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At low and high temperatures in the presence and absence of magnetic fields, the effects of shear rate, angular frequency, and shear strain on the rheological characteristics of zinc ferrite ferrofluid is investigated. Chemical co-precipitation was used to create a zinc ferrite ferrofluid that was then coated with oleic acid to improve the stability of the fluid's particles and avoid particle agglomeration. We looked at the rheological characteristics caused by the induced magnetic field, such as the shear stress, complex viscosity, storage modulus, loss modulus, relaxation modulus, viscous torque, damping factor, and figure of merit. From the analysis of time dependent relaxation modulus, a steady-state rheological system is formed at time interval beyond 50 s. As the shear and complex viscosities increase with an increase in magnetic field and a decrease in temperature, obstruction to fluid flow is produced. When a rheological system operates at low angular frequency and high shear rate, high shear stress is loaded; when it operates at high angular frequency and low shear rate, low shear stress is loaded. The oscillatory mode test demonstrates a change in structure from solid to liquid due to the establishment of a crossover point, supporting the solid-liquid phase transition behavior. The damping analysis demonstrates that the system is in fact excessively dampened, and it may now be utilized to reduce vibrations in a system. The system is really overdamped, according to the damping study, and can therefore be used to reduce vibrations in other systems. The fluid exhibits non-Newtonian shear-thinning behavior as shear rates increase. A high viscous torque is created at low shear strain and high angular frequency, which leads to the creation of a strong rotating magnetic field.

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Section: Damping Factor Analysismentioning

confidence: 99%

A trivalent ferrite ferrofluid compound’s rheological response to angular frequency, magnetic induction and shear induction of chain clusters

Abideen A,

Pant

2023

Phys. Scr.

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“…In 1978, a viscous-fluid inertia damper that utilized the levitation characteristics of a ferrofluid was created and used to dampen the rotary shaft of a stepping motor [46]. Subsequently, scholars have conducted research on the levitation force [47,48] and energy dissipation [49,50]. An MF dynamic absorber was proposed based on a related theoretical study [51], which could reduce the vibration of flexible overhanging structures on spacecraft.…”

Section: Introductionmentioning

confidence: 99%

Typical dampers and energy harvesters based on characteristics of ferrofluids

Han

et al. 2022

Friction

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Ferrofluids are a type of nanometer-scale functional material with fluidity and superparamagnetism. They are composed of ferromagnetic particles, surfactants, and base liquids. The main characteristics of ferrofluids include magnetization, the magnetoviscous effect, and levitation characteristics. There are many mature commercial ferrofluid damping applications based on these characteristics that are widely used in numerous fields. Furthermore, some ferrofluid damping studies such as those related to vibration energy harvesters and biomedical devices are still in the laboratory stage. This review paper summarizes typical ferrofluid dampers and energy harvesting systems from the 1960s to the present, including ferrofluid viscous dampers, ferrofluid inertia dampers, tuned magnetic fluid dampers (TMFDs), and vibration energy harvesters. In particular, it focuses on TMFDs and vibration energy harvesters because they have been the hottest research topics in the ferrofluid damping field in recent years. This review also proposes a novel magnetic fluid damper that achieves energy conversion and improves the efficiency of vibration attenuation. Finally, we discuss the potential challenges and development of ferrofluid damping in future research.

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“…Ferrofluid-based devices and applications have captured the attention of many researchers around the globe. This artificial magnetically sensitive liquid substance exhibits some special properties when it is exposed to a magnetic field, and thus it has found its place in some promising applications, such as dampers [1][2][3][4][5], accelerometers [6][7][8], vibration absorbers [9][10][11][12][13][14], and various sensors [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Contactless Determination of a Permanent Magnet’s Stable Position within Ferrofluid

et al. 2022

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The paper deals with the contactless detection of a rod permanent magnet’s position within a ferrofluid. The working principle of the proposed approach is grounded on the solenoidal nature of the field lines. For the line detection technique analyzed in this article, where the magnetic field is scanned along the line parallel to the magnet’s axial direction, the center of the magnet corresponds to the point on the line where the radial component of the magnetic field vanished. The concept introduced here was evaluated numerically, where the results showed a promising perspective for the technique to be employed in practice. In contrast to the X-ray or Vernier-caliper-based technique, the one proposed here is somewhat more suitable for employment in applications where simplicity and robustness are of vital importance.

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Magnetic levitation force exerted on the cylindrical magnet in a ferrofluid damper

Cited by 13 publications

References 10 publications

A trivalent ferrite ferrofluid compound’s rheological response to angular frequency, magnetic induction and shear induction of chain clusters

A trivalent ferrite ferrofluid compound’s rheological response to angular frequency, magnetic induction and shear induction of chain clusters

Typical dampers and energy harvesters based on characteristics of ferrofluids

Contactless Determination of a Permanent Magnet’s Stable Position within Ferrofluid

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