Transient behavior of compressed magnetorheological brake excited by step currents

Wang, Hongyun; Bi, Chen; Yong-ju, Zhang; Ji, Axiang; Qiu, Pengyuan

doi:10.1038/s41598-021-91836-6

Cited by 15 publications

(6 citation statements)

References 42 publications

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“…Magnetorheological (MR) fluid is a kind of intelligent material that shows a significant increase of viscosity and shear stress when an external magnetic field is applied (Ankur et al, 2021; Wang et al, 2021a; Yu et al, 2022). The shear behavior is typically modeled by the Bingham model as…”

Section: Introductionmentioning

confidence: 99%

An experimental study on mechanical properties of a magnetorheological fluid under slow compression

Wang

et al. 2023

Journal of Intelligent Material Systems and Structures

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Mechanical properties of magnetorheological (MR) fluids have been investigated in slow compression under different magnetic fields. The compressive stress of the MR fluid has been deduced by assuming that it was a continuous shear flow in Bingham model and has been calculated. The compressive stress has also measured in different magnetic fields and initial gap distances. The compressive stress of the MR fluid in a high magnetic flux density and/or a small initial gap distance was much higher than that predicted by the traditional continuous media theory. Compressive experimental results were also compared with the continuous media theory by a normalized logarithmic form. The achieved experimental result seems to deviate from the prediction by the continuous media theory at a high magnetic flux density and a small initial gap distance. The MR fluid had a high compressive modulus when the compressive strain was lower than 0.042. The compressive modulus had an exponential relationship with the compressive strain higher than 0.042. Frictions between particles, which contribute to the high structure factor, were thought to play an important role in the large deviations in squeeze mode.

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Section: Introductionmentioning

confidence: 99%

An experimental study on mechanical properties of a magnetorheological fluid under slow compression

Wang

et al. 2023

Journal of Intelligent Material Systems and Structures

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“…Usually, the time to reach a stable value of 63.2% or 95% is selected as a time constant. In this section, the time when the corresponding torque rises to 63.2% of the stable value is defined as the rising time, and the time when the corresponding torque decreases to 36.8% of the stable value is defined as the falling time [44]. 1.32 s, 0.72 s, 0.74 s for the 20 N m, 30 N m, 40 N m expected torques, respectively, when the transmission torque decreases to 36.8% of the stable torque.…”

Section: Control Experimentsmentioning

confidence: 99%

Development and evaluation of a magnetorheological fluid-based clutch with hybrid excitation

Wu,

Huang,

Xie

2023

Smart Mater. Struct.

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This article presents the development and control of a hybrid excitation magnetorheological (MR) fluid clutch with improved magnetic core. The clutch adopts a hybrid excitation design with coils and permanent magnets. To obtain an increased torque, an improved magnetic core shape of the permanent magnets is adopted in the clutch. Furthermore, simulation is used to test the magnetic field in the fluid gaps. Then, a prototype is manufactured, and a test bed is built. Experiments prove that the designed hybrid excitation MR clutch has an improved torque. In order to achieve accurate torque output, a genetic algorithm (GA) optimized fuzzy PID controller is presented and compared with the other two controllers, and the effectiveness is verified by simulations and experiments. It turns out that the proposed GA optimized fuzzy PID controller is effective in improving the torque tracking accuracy and can be used for torque control of MR clutches.

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“…In general, the time to 63.2% or 95% of the stable value is often used as the time constant. In our study, the time that the torque rises to 63.2% of the stable value is defined as the time constant (Wang et al, 2021). Figures 16–18 show the torque and input current lifting process under different rotational speeds and different target torques.…”

Section: Experimental Evaluation Of Mr Clutchmentioning

confidence: 99%

A multi-pole magnetorheological clutch powered by permanent magnets and excitation coils

Deng

Huang

et al. 2022

Journal of Intelligent Material Systems and Structures

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This article presents a new design of a multi-pole magnetorheological (MR) clutch, with a hybrid magnetization using several permanent magnets and several excitation coils. The permanent magnets are used as the first source of generating the magnetic field, and the excitation coils are used to adjust the magnetic field to the required value. Firstly, a detailed illustration of the mechanical design of the MR clutch is presented. The principal design parameters of the proposed clutch are determined to achieve maximum torque according to the magnetic circuit. After that, the torque model is established, and simulations are conducted to evaluate the magnetic circuit design. Subsequently, an experimental set-up is established, and the proposed MR clutch is designed and manufactured, and a series of experiments are carried out. The results clearly show that different torque output can be obtained by controlling the current magnitude and direction of each coil. Finally, to achieve a precise feedback torque control, the design of a current controller is carried out using conventional proportional-integral-derivative (PID) control scheme. The results demonstrate that the designed PID controller can be used to obtain the desired torque.

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Transient behavior of compressed magnetorheological brake excited by step currents

Cited by 15 publications

References 42 publications

An experimental study on mechanical properties of a magnetorheological fluid under slow compression

An experimental study on mechanical properties of a magnetorheological fluid under slow compression

Development and evaluation of a magnetorheological fluid-based clutch with hybrid excitation

A multi-pole magnetorheological clutch powered by permanent magnets and excitation coils

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