Magnetically-Induced Pressure Generation in Magnetorheological Fluids under the Influence of Magnetic Fields

Widodo, Purwadi Joko; Budiana, Eko Prasetya; Ubaidillah, Ubaidillah; Imaduddin, Fitrian

doi:10.3390/app11219807

Cited by 9 publications

(8 citation statements)

References 32 publications

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“…From the comparison of the application of current strength in Table 2, it is shown that the magnitude of the current applied to the MRF correlates with the resulting liquid pressure, as has been disclosed in previous studies [33]. In addition to the strong electric current, the amount of pressure is also influenced by the accumulation of magnetic particles on one side of the channel.…”

Section: Discussionsupporting

confidence: 60%

“…In previous studies, observations have been made with regard to changes in the magnitude of MRF pressure as a result of variations in the application of magnetic field strength to MRF [33]. From these observations, it can be seen that the phenomenon of a change in pressure strength associated with a change in the magnitude of magnetic field strength, which is represented in the form of a robust electric current applied to a magnetic coil, exists.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in this study, further efforts were made to observe this phenomenon by providing a stronger current over a longer time period and by applying an electric current with a particular frequency to a magnetic coil to determine its effect on the MRF pressure performance. As in previous studies [33], this study was carried out using a U-type glass channel, which can easily be used to identify pressure changes by visually observing the difference in the liquid level. In addition, as a continuation of this research, a signal generator was used to adjust the frequency.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Time and Frequency of Magnetic Field Application on MRF Pressure Performance

et al. 2022

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This research was conducted to determine the effect of the time and frequency of magnetic field application on MRF pressure performance. It was carried out by placing magnetorheological fluid (MRF) in a U-shaped, glass tube and then repeatedly applying a magnetic field to it for a certain time period with a particular frequency set by the generator frequency. The length of the application period of the magnetic field, the frequency of the application of the magnetic field, and the magnitude of changes in fluid pressure that occurred and changes in pressure in the MRF were recorded with a data logger for a specific time, which was 60 s. From the field tests that were carried out, it was found that during the application of a continuous magnetic field, there was pressure on the MRF until it reached the maximum pressure; then, there was a gradual decrease in pressure when the magnetic field was turned off, but the pressure was intense. It was shown that the pressure decreased rapidly as the magnetism disappeared, even causing the pressure to drop below the initial pressure, which, in turn, gradually rose again toward the equilibrium pressure. Meanwhile, during the repeated application of a magnetic field, it appeared that the MRF effectively produced pressure in response to the presence of a magnetic field up to a frequency of 5 Hz. The higher the applied magnetic field frequency, the smaller the pressure change that occurred. Starting at a frequency of 10 Hz, the application of a magnetic field produced more minor pressure changes, and the resulting pressure continued to decrease as the liquid level decreased toward the initial equilibrium position.

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Section: Discussionsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Time and Frequency of Magnetic Field Application on MRF Pressure Performance

et al. 2022

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“…This is because as the eccentricity increases, the siz of the converging wedge inlet of the magnetic fluid lubricant film increases and the siz of the outlet decreases, accumulating more and more magnetic fluid near the outlet of th converging wedge and increasing pressure; the size of the diverging wedge inlet de creases and the size of the outlet increases, with less and less magnetic fluid near the di verging wedge inlet and decreasing pressure. Thus, the magnetic fluid lubricating oil film has a strong wedge effect, and the oil film carrying capacity is increased, leaving the jour nal in a relatively balanced position [31]. Figure 10 gives the oil film temperature distribution of magnetic fluid bearings with different eccentricity.…”

Section: Flow Field Analysis Of Magneto-fluid Lubricated Bearingsmentioning

confidence: 99%

Structural Design and Lubrication Properties under Different Eccentricity of Magnetic Fluid Bearings

Wang

Pan

et al. 2022

Applied Sciences

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As a lubricant, the viscosity of the magnetic fluid changes with the external magnetic field, which improves the bearing capacity of the oil film and hence the lubrication effect, and has a promising application in bearings. Based on the Roelands viscosity theory, the Shliomis model is used to derive the viscous temperature, viscous pressure, and magnetic viscosity characteristics of magnetic fluids under the influence of an applied magnetic field, and further proposes a structural model of magnetic fluid lubricated bearings to investigate the pressure, temperature and magnetic intensity distribution of magnetic fluids under different eccentricity conditions. The results show that the viscosity of the magnetic fluid decreases exponentially with increasing temperature, rises linearly with increasing pressure, and increases and stabilizes with increasing magnetic induction strength. Because the minimum film thickness point is the dividing point between the convergent wedge and the dispersed wedge, the pressure distribution of the lubricant film separates high pressure from low pressure at the minimum film thickness, and the differential pressure increases with the increase in eccentricity. The temperature distribution of the high-temperature zone is mainly distributed in the middle of the film, and the minimum film thickness zone and the maximum temperature increases with the increase in eccentricity. The magnetic intensity distribution of the strong magnetic field is mainly concentrated in the minimum film thickness zone, and the magnetic induction intensity increases with the increase in eccentricity. The results of this study have certain research significance for solving the problem of the poor lubrication effect of bearing lubricant due to high temperature.

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“…In addition, a study of the magnetic flux density along the axis of symmetry of the bladder above the face of the electromagnet is provided. In the article [23], FEM was used to correlate simulation data with experimental measurements of the real object to then perform a study of the magnetic flux density inside the core of the coil containing the MRF. In the aforementioned papers, FEM simulations have been used to represent the magnetic field distribution of the proposed gripper solutions or to study the behaviour of the MRF.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of a Magnetic Field Exciter for Controlling Magnetorheological Fluid in a Hybrid Soft-Rigid Jaw Gripper

Białek

Jędryczka

2023

Energies

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The paper deals with an optimization of a magnetic circuit of the field exciter designed to control magnetorheological fluid (MRF) in a hybrid soft–rigid jaw gripper. The case discussed includes sealing of the MRF inside a cushion made of thermoplastic polyurethane (TPU). The shear stress distributions in the MRF upon magnetic field excitation have been analyzed for various permanent magnet, yoke, and air gap dimensions. In the developed numerical model of the magnetic field exciter, the geometry of the considered domain was parameterized. As part of the simulation study, more than 4600 variants of the magnetic circuit were analyzed, for which the shear stress distribution in the MRF inside the cushion was determined. The numerical model has been implemented in the Ansys Electronics Desktop 2020 finite element method (FEM) package. Research was focused on finding dimensions of the magnetic circuit that ensure the desired distribution of the shear stress in the MRF inside the cushion. The undeformed and deformed by axial plunging of the pin cushions geometries have been analyzed. The evaluation criteria were the achievement of the highest possible value of the shear stress and the uniformity of its distribution in the given cross-sectional area of the MRF inside the cushion. The main objective of the analysis was to design the magnetic field exciter for application in the jaw pads of a gripper using MRF cushions. Through research, a suitable configuration tailored to the needs of the application was proposed.

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Magnetically-Induced Pressure Generation in Magnetorheological Fluids under the Influence of Magnetic Fields

Cited by 9 publications

References 32 publications

Effect of Time and Frequency of Magnetic Field Application on MRF Pressure Performance

Effect of Time and Frequency of Magnetic Field Application on MRF Pressure Performance

Structural Design and Lubrication Properties under Different Eccentricity of Magnetic Fluid Bearings

Design and Optimization of a Magnetic Field Exciter for Controlling Magnetorheological Fluid in a Hybrid Soft-Rigid Jaw Gripper

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