Effective method of applying magnetic field on a tuned liquid damper using a magnetic fluid

Horie, Shohei; Shimoda, Manabu; Ohno, Ken; Nakamura, Jun; Sawada, Tatsuo

doi:10.3233/jae-2007-834

Cited by 8 publications

(9 citation statements)

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“…In 2007, Horie et al [118] explained the unique damping characteristics of a TMFD by using a new analytical model. The upper and lower electromagnets were used to provide a vertical magnetic field when the dimensionless frequency ranges were 0.92-0.96 Hz and 1.01-1.02 Hz, respectively, and the resonance peaks of the structure decreased significantly.…”

Section: Tmfdsmentioning

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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Section: Tmfdsmentioning

confidence: 99%

Typical dampers and energy harvesters based on characteristics of ferrofluids

Han

et al. 2022

Friction

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“…Since the magnetic fluid in the gap has a one-dimensional quasi-stationary flow, vf does not vary with the coordinate x, nor does it change with the coordinate x by equation (9). Therefore,…”

Section: Calculate the Viscous Energy Dissipation In Magnetic Liquidmentioning

confidence: 99%

“…Hideaki Fukuda [5][6] further installed an electromagnet outside the piston-type magnetic liquid damper to achieve active control of vibration. So in 1998, Abé Masato [7] proposed a tuned magnetic liquid damper which was subsequently developed by Yasuhiro Ohira [8][9] and was validated by simulation and experiment. In 2002, V. G. Bashtovoi [10] created a magnetic liquid dynamic vibration absorber, which is found to be most suitable for damping small amplitude (less than 1mm) and small frequency (less than 1Hz).…”

Section: Introductionmentioning

confidence: 99%

Dynamic modeling and experimental analysis of magnetic fluid dampers

Deng¹,

Xiao²,

Liang³

et al. 2017

MMC_B

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The paper puts forward a magnetic fluid damper with simple structure. A dynamic model of magnetic fluid in the damper is built up based on Newton's second law and the continuity equation. The representation of logarithmic decay rate of damper imposing on the back beam of cantilever beam is acquired through the oscillating energy of an elastic cantilever beam. The designed experiments prove that logarithmic decay rate of beam oscillation is influenced by different radius of permanence magnets in dampers, different gap between casing and permanent magnet and magnetic fluid with different saturation magnetization. It is indicated that theory and experimental results are in agreement under the assumed condition. In particular, it is found that the damping effect of magnetic fluid dampers is improved with the increment of radius of permanent magnet within a certain scope, there is an optimal gap between damper casing and permanent magnet, which can make beam oscillation reach the maximum logarithmic decay rate.

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“…Electromagnets were also installed on the piston type dampers to realize active control (Kamiyama et al, 2002;Kanno et al, 2005). Masato et al (1998) proposed a tuned liquid damper using ferrofluid, whose analysis model was build and verified by Ohira et al (2001Ohira et al ( /2002 and Horie et al (2007). Bashtovoi et al (2002) investigated a ferrofluid shock absorber, which was the best for dampening of oscillations with small amplitude and small frequency.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics and energy dissipation in a ferrofluid damper

Yang

Feng

2012

Journal of Vibration and Control

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A ferrofluid damper with a simple structure is proposed. Hydrodynamics and energy dissipation in the damper are studied theoretically and experimentally. This is applied to the study of damping of a cantilever whose free extremity is installed with the ferrofluid damper. The dependences of the decrement of the oscillations on the geometrical characteristics of the damper are described by a theoretical model and are shown to predict the experimental result well under some conditions.

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Effective method of applying magnetic field on a tuned liquid damper using a magnetic fluid

Cited by 8 publications

References 0 publications

Typical dampers and energy harvesters based on characteristics of ferrofluids

Typical dampers and energy harvesters based on characteristics of ferrofluids

Dynamic modeling and experimental analysis of magnetic fluid dampers

Hydrodynamics and energy dissipation in a ferrofluid damper

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