Article
Chemistry, Physical
Roland Nagy, Istvan Szalai
Summary: Magnetorheological fluids (MRFs) are smart materials that change their rheological properties in response to a magnetic field. This study introduces a system for investigating the sedimentation of MRFs using a custom-developed apparatus and measurement principle. The performance of the system is validated using Lord MR fluids.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Nanoscience & Nanotechnology
Grazia Lo Sciuto, Pawel Kowol, Adam Pilsniak
Summary: This article presents an automated measurement system for studying the magnetic permeability of a magnetorheological fluid. It includes microcontrollers and digital systems and makes use of a JavaScript code combined with the Digilent WaveForms measurement software application to automate the measurements and characterize the magnetic permeability of the MR fluids that can change due to the application of a magnetic field.
MICROFLUIDICS AND NANOFLUIDICS
(2022)
Article
Nanoscience & Nanotechnology
Peiran Zhao, Liang Yan, Xiaoshan Gao
Summary: Magnetorheological liquid metal (MLM) robots combine solid and liquid properties, allowing for plasticity, large-scale deformability, good conductivity, motion flexibility, and object manipulation. They can perform all the functions of existing droplet robots, as well as additional tasks such as pulling large objects, repairing damaged circuits selectively and reversibly, and repairing suspended circuits through plasticity.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Instruments & Instrumentation
M. Kubik, K. Sebesta, Z. Strecker, F. Jenis, J. Goldasz, I. Mazurek
Summary: The transient behavior affects the performance of MR actuators, with stronger magnetic fields resulting in shorter hydrodynamic response times. On the other hand, higher gap sizes and temperatures lead to longer response times.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Automation & Control Systems
Zhe Lv, Rongguo Hou, Guoyong Zhao
Summary: The use of magnetorheological (MR) fluid can prevent the instability and spreading out of jet flow outside the focusing tube in abrasive waterjet machining, while an external axial magnetic field can improve erosion footprint and processing performance. Results from experiments on alumina validate the effectiveness of applying magnetic field to enhance jet flow concentration and restrain velocity attenuation.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Chuncheng Yang, Teng Li, Xiangyu Pei, Jiaxin Li, Zhao Yuan, Yan Li, Xiufang Bian
Summary: A new magnetic fluid was prepared by dispersing amorphous magnetic Fe-Ni-B nanoparticles into water, and its magnetorheological and viscoelastic behaviors were investigated. The particles obtained were spherical amorphous particles with a diameter of 12-15 nm. The Fe-based amorphous magnetic fluid exhibited shear shinning behavior under magnetic fields and showed strong magnetic responsiveness. The magnetorheological and viscoelastic behaviors were found to be related to the structural formation and destruction in the magnetic fluids, which is a joint effect of magnetic fields and shear flows.
Article
Physics, Applied
Yuqin Fan, Lei Xie, Wenyan Yang, Baoguang Sun
Summary: The study shows that the viscoelastic moduli of HVLP MRF are dependent on the magnetic field, with the storage modulus increasing with higher magnetic flux density and the loss modulus showing a tendency of first increase and then decrease. A critical particle concentration threshold of around 70% was found to maximize the magneto-storage modulus increment. The shear angular frequency has little effect on HVLP MRF in the linear viscoelastic region, indicating excellent working stability in a complex environment.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Yaojung Shiao, Mahendra Babu Kantipudi
Summary: This paper presents a new flexible valve train with an MR fluid control system, which enhances the performance of internal combustion engines. The study includes conceptual design, numerical simulations, prototype fabrication, and experimental tests to evaluate the real-time performance of the MR valve train. The results demonstrate the reliability of the proposed MR valve train.
APPLIED SCIENCES-BASEL
(2022)
Article
Mechanics
E. Akbari, H. Khajehsaeid, R. Asiaban
Summary: Magnetorheological fluids (MRFs) exhibit variable mechanical properties in response to magnetic stimuli and can be utilized in various applications such as torque transmission devices like clutches. This study investigates the geometrical design of cylindrical MR clutches to optimize torque transmission capability. The effects of design parameters and MRF volume are examined in the presence of different magnetic fields. It is found that increasing the clutch's inner radius and using an MRF with higher particle content can enhance the transmitted torque.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Xinqiao Tang, Xiaolong Chang, Jiwei Wang, Shizhi Jiang, Shuqi Zhang, Shuo Wang, Xinrui Li, Fanbao Meng
Summary: In this study, a magnetorheological (MR) fluid with high yield stress and enhanced sedimentation stability was successfully synthesized using magnetic Fe3O4 nanoparticles and a liquid crystal material. The Fe3O4@PILC-based MR fluid exhibited excellent MR effect and magnetic field response, and demonstrated a high MR efficiency. Compared to traditional Fe3O4-based MR fluids, the Fe3O4@PILC-based fluid also showed remarkable sedimentation stability.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Engineering, Manufacturing
Manjesh Kumar, Manas Das
Summary: This article presents a method for precisely finishing narrow ridge profiles of poppet valves using the rotational-magnetorheological fluid-based finishing process. The impact of process parameters is determined through statistical analysis and simulation of finishing forces. The results show that the finished poppet valves have a smaller surface roughness and may have a longer service life and improved wear and corrosion resistance.
MATERIALS AND MANUFACTURING PROCESSES
(2022)
Article
Engineering, Multidisciplinary
Manjesh Kumar, Manas Das
Summary: This article reports on a novel method for uniformly polishing narrow poppet valve profiles to reduce hydrocarbon emissions in aerospace gas propulsion engines. By using different combinations of magnetorheological polishing (MRP) fluid, precise finishing of Nickel aluminium bronze poppet profiles is achieved, resulting in ultrafine surface roughness.
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
(2022)
Article
Instruments & Instrumentation
Michal Kubik, Janusz Goldasz, Ondrej Machacek, Zbynek Strecker, Bogdan Sapinski
Summary: Magnetorheological (MR) fluids are fine particle suspensions that can change their apparent viscosity dramatically when subjected to a magnetic field. This property has been used in automotive suspension systems and optics manufacturing. The behavior of MR fluids in pinch mode, which involves non-uniform magnetic field distributions, differs significantly from other operating modes. The authors conducted experiments to study this phenomenon and found that the effect in pinch mode depends not only on the magnitude of the magnetic stimuli but also on the particle concentration. This research may guide the development of novel valveless actuators utilizing MR fluids in pinch mode.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Instruments & Instrumentation
Xiaolong Yang, Zhiqiang Cao, Gang Liu, Guojin Xie
Summary: In order to solve the problems of small pressure drop range and achieve lower response time and small power consumption of traditional control valves in automotive hydraulic lift, a new multi-ring and multi-disc magnetorheological valve based on magnetorheological fluid was designed using the magnetic circuit method. The pressure drop mathematical model of the valve was established and its performance was studied through electromagnetic field simulation. Experimental studies on the pressure drop characteristics and response time of the valve under different conditions were conducted. The results demonstrate that the multi-ring and multi-disc MR valve has a saturation pressure drop greater than 7 MPa and a response time ranging from 136 to 178 ms, highlighting its performance advantage.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Physics, Applied
Wei Yan, Yuanwen Gao
Summary: A novel phononic crystals structure made of periodically arranged hollow pillars filled with magnetorheological fluid has been fabricated, allowing for control over the frequency range using external magnetic fields. Experimental results indicate the frequency range of the bandgap shifts to a lower frequency when an external magnetic field is applied.
APPLIED PHYSICS EXPRESS
(2021)