Preparation and Experimental Study of Magnetorheological Fluids for Vibration Control

Guo, Yingqing; Xu, Zhong; Chen, Bingbing; Ran, Cheng-Song; Guo, Weiyang

doi:10.20855/ijav.2017.22.2464

Cited by 10 publications

(5 citation statements)

References 12 publications

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“…The MR damper can be compared to a standard shock absorber, with the difference being that it is filled with MR fluid, which consists of magnetisable particles suspended in a carrier fluid, often mineral oil [ 1 , 38 ]. The MR fluid flowing through gaps located in the damper’s piston is subjected to a magnetic field induced by electric coils.…”

Section: Dynamic Vibration Model Of Vehicle With Mr Dampers and The D...mentioning

confidence: 99%

Identification of Control-Related Signal Path for Semi-Active Vehicle Suspension with Magnetorheological Dampers

Krauze

2023

Sensors

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This paper presents a method for the identification of control-related signal paths dedicated to a semi-active suspension with MR (magnetorheological) dampers, which are installed in place of standard shock absorbers. The main challenge comes from the fact that the semi-active suspension needs to be simultaneously subjected to road-induced excitation and electric currents supplied to the suspension MR dampers, while a response signal needs to be decomposed into road-related and control-related components. During experiments, the front wheels of an all-terrain vehicle were subjected to sinusoidal vibration excitation at a frequency equal to 12 Hz using a dedicated diagnostic station and specialised mechanical exciters. The harmonic type of road-related excitation allowed for its straightforward filtering from identification signals. Additionally, front suspension MR dampers were controlled using a wideband random signal with a 25 Hz bandwidth, different realisations, and several configurations, which differed in the average values and deviations of control currents. The simultaneous control of the right and left suspension MR dampers made it necessary to decompose the vehicle vibration response, i.e., the front vehicle body acceleration signal, into components related to the forces generated by different MR dampers. Measurement signals used for identification were taken from numerous sensors available in the vehicle, e.g., accelerometers, suspension force and deflection sensors, and sensors of electric currents, which control the instantaneous damping parameters of MR dampers. The final identification was carried out for control-related models evaluated in the frequency domain and revealed several resonances of the vehicle response and their dependence on the configurations of control currents. In addition, the parameters of the vehicle model with MR dampers and the diagnostic station were estimated based on the identification results. The analysis of the simulation results of the implemented vehicle model carried out in the frequency domain showed the influence of the vehicle load on the absolute values and phase shifts of control-related signal paths. The potential future application of the identified models lies in the synthesis and implementation of adaptive suspension control algorithms such as FxLMS (filtered-x least mean square). Adaptive vehicle suspensions are especially preferred for their ability to quickly adapt to varying road conditions and vehicle parameters.

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Section: Dynamic Vibration Model Of Vehicle With Mr Dampers and The D...mentioning

confidence: 99%

Identification of Control-Related Signal Path for Semi-Active Vehicle Suspension with Magnetorheological Dampers

Krauze

2023

Sensors

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“…The density difference between particles and the carrier fluid leads to clear sedimentation, which reduces the adjustability and seismic performance of the MR device. Researchers investigated the influence of particle shape (Bell et al, 2008;De Vicente et al, 2009), size (Bondi, 1956), multi-diameter ratio (Foister, 1997;Guo et al, 2017), and material (Thomas, 1966) on the performance of magnetorheological fluids. In addition, many researchers have found that different from conventional silicon oil carrier fluids, ionic liquids (Guerrero-Sanchez et al, 2007), magnetofluids (Ginder et al, 1996), polymers (Iyengar et al, 2004) and other carrier fluids improve the properties of magnetorheological fluids.…”

Section: Smart Vibration Mitigation Materialsmentioning

confidence: 99%

Recent Advances in Multi-Dimensional Vibration Mitigation Materials and Devices

Chen

Zhou

et al. 2019

Front. Mater.

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Harmful vibrations can cause many engineering problems, such as disasters of civil engineering structures, failure of precision equipment, and the disruption of some spacecraft components. In most situations, the vibrations are usually three-dimensional excitations. Therefore, research on multi-dimensional vibration control has become a worldwide hotspot in engineering. This article presents a comprehensive assessment of recent developments of multi-dimensional vibration mitigation devices and the material applied in such devices. The vibration mitigation materials mainly include the passive vibration mitigation materials and smart vibration mitigation materials. Subsequently, the vibration mitigation devices in civil engineering, mechanical engineering, and aerospace engineering are reviewed and commented, respectively. Above all, the multi-dimensional vibration mitigation devices and materials are found to be effective for reducing multi-dimensional vibrations. However, enhancing the mitigation performance of the devices in each direction, including improving the mitigation capability of materials, is still a challenging issue.

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“…Sedimentation stability is one of the most important properties of MR fluids which is evaluated by their sedimentation rates calculated by the following equation (Guo et al, 2017). The sedimentation ratio is defined as:…”

Section: Stability Tests Of Mr Fluidsmentioning

confidence: 99%

Preparation and Tests of MR Fluids With CI Particles Coated With MWNTs

Guo

Sun

et al. 2018

Front. Mater.

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The magnetorheological (MR) fluid is a typical smart material, whose shear yield stress can be adjusted through changing the strength of external magnetic field, and the changing process only takes a few milliseconds. The MR fluid is composed of micro/nanometer ferromagnetic particles, carrier fluids, and some additives. Among them, the performance of ferromagnetic particles will mainly affect the sedimentation stability and the magnetic saturation of the MR fluid. Therefore, the ferromagnetic particles are expected to have characteristics of both low density and high magnetism. In this paper, the multi-walled carbon nanotubes (MWNTs) were adopted to coat on the carbonyl iron (CI) particles with grafting technology using ultrasonication and mechanical stirring. The coated CI particles with perfect core-shell structure were developed and the influence of the dosages of grafting agent and MWNTs were tested. And then, MR fluids with CI particles coated with MWNTs were established and the coating effect was studied through surface topography particle density, and magnetic properties of composite magnetic particles and stability tests of the prepared MR fluids. The results showed that although the magnetic saturation of the prepared MR fluids with CI particles coated with MWNTs would reduce slightly, the particles density and the adsorption force between the particles were decreased effectively, which are both advantageous to the improvement of the sedimentation stability of MR fluids.

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Preparation and Experimental Study of Magnetorheological Fluids for Vibration Control

Cited by 10 publications

References 12 publications

Identification of Control-Related Signal Path for Semi-Active Vehicle Suspension with Magnetorheological Dampers

Identification of Control-Related Signal Path for Semi-Active Vehicle Suspension with Magnetorheological Dampers

Recent Advances in Multi-Dimensional Vibration Mitigation Materials and Devices

Preparation and Tests of MR Fluids With CI Particles Coated With MWNTs

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