Investigation of the relationship among the microstructure, rheological properties of MR grease and the speed reduction performance of a rotary micro-brake

Dai, Jun; Chang, Hui; Zhao, Rui; Huang, Jue; Li, Kaiquan; Xie, Saipeng

doi:10.1016/j.ymssp.2018.07.004

Cited by 38 publications

(23 citation statements)

References 44 publications

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“…As the rheological properties can be controlled by an external magnetic field rapidly, reversibly, and continuously, magnetosensitive smart materials have great application potential in construction, automotive industry, artificial intelligence, etc. Depending on the carrier matrix material, different types of MR materials can be composed such as MR fluid [18,19], MR elastomer [20,21], MR gel [22,23], MR foam [24,25] and MR grease [26,27]. In order to create a better desired feedback force, actuators featuring magnetorheological fluid (MRF) have been recently implemented [28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Design and Experimental Validation of a 3-DOF Force Feedback System Featuring Spherical Manipulator and Magnetorheological Actuators

et al. 2020

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This research focuses on the development of a new 3-DOF (Degree of Freedom) force feedback system featuring a spherical arm mechanism and three magnetorheological (MR) brakes, namely two rotary MR brakes and one linear MR brake. The first rotary MR brake is integrated in the waist joint to reflect the horizontal tangent force, the other rotary MR brake is integrated in the shoulder joint to reflect the elevation tangent force, while the linear MR brake is integrated in the sliding joint of the arm to reflect the radial force (approach force). The proposed configuration can reflect a desired force to the operator at the end-effectors of the arm independently in 3 DOFs by controlling the current applied to the coils of the MR brakes. After the introduction, the configuration of the proposed force feedback system is presented. Afterward, the design and conducted simulation of the MR brakes for the systems are provided. The prototype of the force feedback system, which was manufactured for the experiment, is then presented as well as some of the obtained experimental results. Finally, the proposed control system is presented and its implementation to provide a desired feedback force to the operator is provided.

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Section: Introductionmentioning

confidence: 99%

Design and Experimental Validation of a 3-DOF Force Feedback System Featuring Spherical Manipulator and Magnetorheological Actuators

et al. 2020

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“…MRF is the mixture of micron size magnetizable iron particles with non-magnetic carrier fluid [4][5][6][7][8]. Typically, it contains ferromagnetic particles [4] and a synthetic or silicone-based oil [9].…”

Section: Introductionmentioning

confidence: 99%

“…It is a very responsive material that could react in milliseconds subjected to a magnetic field [5,8,10,11]. The properties change in conjunction with the increment of viscosity because the magnetic field particles start to make a line along the flux path, so that makes a bond like-chain [5,6,8,12].…”

Section: Introductionmentioning

confidence: 99%

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Torque Characterization of T-shaped Magnetorheological Brake Featuring Serpentine Magnetic Flux

Nya’Ubit

Priyandoko

Imaduddin

et al. 2020

ARFMTS

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Recently, T-shaped Magnetorheological Brake (MRB) usually utilize more than one wire coil electromagnetic to maximize magnetic flux reaching all Magnetorheological Fluid (MRF) gaps. This research was focused on the usage of a single wire coil on MRB with uniformly magnetic flux distribution. To achieve the goal, the serpentine magnetic flux profile was adopted to maximize all MRF gaps that only use a single coil. Firstly, the magnetic circuit which implementing serpentine magnetic flux was design in a two-dimensional model. It was then followed by magnetostatic simulation using Finite Element Method Magnetics (FEMM) to determine the amount of magnetic flux density. The data were then employed to calculate the braking torque. After having the final dimension and completing the workshop drawing, an MRB prototype was fabricated. Thus, the prototype was characterized using the braking test apparatus to figure out the torque profiles. Moreover, the experimental results were compared to the simulation results. This process justified the validity of the proposed mathematical model of the T-shaped MRB. It was investigated that the maximum braking torque from simulations and experimental works were 1.51 Nm and 1.91 Nm at 1 A, respectively. Overall the between differences of simulations and experimental works were about 10%. It is therefore, the mathematical model can be used for further application in the actuator control system.

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“…As the speed of an MR device increases, due to the speed-dependent torque transfer, the MR fluid might exceed the allowable torque limit. In contrast, MR grease can provide constant torque output to high-speed applications [16,17]. It is noteworthy that MR fluid is prone to leakage in MR devices [15,18].…”

Section: Introductionmentioning

confidence: 99%

Effects of Silicone Oil Viscosity and Carbonyl Iron Particle Weight Fraction and Size on Yield Stress for Magnetorheological Grease Based on a New Preparation Technique

Wang

Dong

et al. 2019

Materials

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This paper investigated the effects of silicone oil viscosity (SOV) and carbonyl iron particle (CIP) weight fraction and size on dynamic yield stress for magnetorheological (MR) grease. The MR grease samples were prepared using orthogonal array L9 on the basis of a new preparation technology. The shear rheological tests were undertaken using a rotational shear rheometer and yield stress was obtained based on the Bingham fluid model. It was found that CIP fractions ranging from 65 wt% to 75 wt% and SOV varying from 50 m2·s−1 to 1000 m2·s−1 significantly affect the magnetic field-dependent yield stress of MR grease, but the CIPs with sizes of 3.2–3.9 μm hardly had any influence based on the analysis of variance (ANOVA). In addition, the yield stress of MR grease mainly depended on the CIP fraction and SOV by comparing their percent contribution (PC). It was further confirmed that there were positive effects of CIP fraction and SOV on yield stress through response surface analysis (RSA). The results showed a high dynamic yield stress. It indicated that MR grease is an intelligent material candidate which can be applied to many different areas requiring high field-induced rheological capabilities without flow for suspension. Moreover, based upon the multivariate regression equation, a constitutive model was developed to express the function of the yield stress as the SOV and fraction of CIPs under the application of magnetic fields.

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Investigation of the relationship among the microstructure, rheological properties of MR grease and the speed reduction performance of a rotary micro-brake

Cited by 38 publications

References 44 publications

Design and Experimental Validation of a 3-DOF Force Feedback System Featuring Spherical Manipulator and Magnetorheological Actuators

Design and Experimental Validation of a 3-DOF Force Feedback System Featuring Spherical Manipulator and Magnetorheological Actuators

Torque Characterization of T-shaped Magnetorheological Brake Featuring Serpentine Magnetic Flux

Effects of Silicone Oil Viscosity and Carbonyl Iron Particle Weight Fraction and Size on Yield Stress for Magnetorheological Grease Based on a New Preparation Technique

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