Effect of Tapered Metering Pin on Magnetorheological Fluid Subjected to Shock Loading

2016 ◽  
Vol 856 ◽  
pp. 3-8
Author(s):  
Yuzo Shimizu ◽  
Shintaro Takagi ◽  
Tatsuo Sawada
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Shock Loading ◽  
Shock Absorber ◽  
Magnetorheological Fluid ◽  
Mr Fluid ◽  
Orifice Area ◽  
Measured Displacement ◽  
Calculated Velocity ◽  
Piston Stroke

This study reports on effects of tapered metering pins on a magnetorheological (MR) fluid subjected to shock loading. Using four types of tapered metering pins, we conducted drop impact tests and qualitative analysis of effects of tapered pins on an MR fluid with a magnetic field applied around an orifice area. We measured the displacement of a piston and calculated velocity and acceleration from the measured displacement. The four different tapered pins changed a piston stroke to bring the impacting mass to rest. The results indicated that the shape of the pins has an effect on the entire process of shock absorption, whereas magnetic field strength has an effect on the post-peak behavior only. These results show that a tapered metering pin has applicability to a shock absorber using an MR fluid.

A Novel Design of Landing Gear Oleo Strut Damper Using MR Fluid for Aircraft and UAV’s

2012 ◽  
Vol 225 ◽  
pp. 275-280
Author(s):  
Chandra B. Asthana ◽  
Rama B. Bhat
Keyword(s):  
Shock Absorber ◽  
Fluid Viscosity ◽  
Simulation Approach ◽  
Body Frame ◽  
Mr Fluid ◽  
Orifice Area ◽  
Aerial Vehicle ◽  
Impact Kinetic Energy ◽  
The Impact ◽  
Novel Design

Most landing gears used in aircraft employ very efficient oleo-pneumatic dampers to absorb and dissipate the impact kinetic energy of the aircraft body frame. A single-acting shock absorber is most commonly used in the oleo strut that has a metering pin extending through the orifice, which can vary the orifice area upon compression and extension of the strut. This variation is adjusted by shaping the metering pin so that the strut load is fairly constant under dynamic loading. In this paper, it is proposed to further change the damping coefficient as a function of time in order to achieve a semi-active control of the aircraft vibrations during landing by using Magnetorheological (MR) fluid in the Oleo. With the metering pin designed for a nominal flight condition, further variation in the fluid viscosity would help achieve the optimal performance in off-nominal flight conditions. A simulation approach is employed to show the effect of different profiles for viscosity variation in the MR fluid. The utility of such a damper can be very well exploited to include different criteria such as the landing distance after touchdown. This type of system can be used also in Unmanned Aerial Vehicle (UAV) application where the focus of design may be to accomplish the task without the consideration of passenger comfort.

Magnetorheological fluid based on amorphous Fe-Si-B alloy magnetic particles

2021 ◽  
pp. 1045389X2110643
Author(s):  
Chuncheng Yang ◽  
Zhong Liu ◽  
Xiangyu Pei ◽  
Cuiling Jin ◽  
Mengchun Yu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Rheological Property ◽  
Magnetic Particles ◽  
Annealing Treatment ◽  
Magnetorheological Fluid ◽  
The Stability ◽  
The Magnetic Field ◽  
Amorphous Particle ◽  
Better Than

Magnetorheological fluids (MRFs) based on amorphous Fe-Si-B alloy magnetic particles were prepared. The influence of annealing treatment on stability and rheological property of MRFs was investigated. The saturation magnetization ( Ms) of amorphous Fe-Si-B particles after annealing at 550°C is 131.5 emu/g, which is higher than that of amorphous Fe-Si-B particles without annealing. Moreover, the stability of MRF with annealed amorphous Fe-Si-B particles is better than that of MRF without annealed amorphous Fe-Si-B particles. Stearic acid at 3 wt% was added to the MRF2 to enhance the fluid stability to greater than 90%. In addition, the rheological properties demonstrate that the prepared amorphous particle MRF shows relatively strong magnetic responsiveness, especially when the magnetic field strength reaches 365 kA/m. As the magnetic field intensified, the yield stress increased dramatically and followed the Herschel-Bulkley model.

scholarly journals Investigation of Thermoplastic Polyurethane Finger Cushion with Magnetorheological Fluid for Soft-Rigid Gripper

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6541
Author(s):  
Marcin Białek ◽  
Cezary Jędryczka ◽  
Andrzej Milecki
Keyword(s):  
Magnetic Field ◽  
3D Printing ◽  
Permanent Magnets ◽  
Force Measurement ◽  
Thermoplastic Polyurethane ◽  
Magnetorheological Fluid ◽  
Fluid Viscosity ◽  
Element Analysis ◽  
Mr Fluid ◽  
The Magnetic Field

This paper presents a study of penetrating a pin into a magnetorheological fluid (MR) cushion focused on the force measurement. The research is supported by detailed finite element analysis (FEA) of the magnetic field distributions in several magnetic field exciters applied to control rheological properties of the MR inside the cushion. The cushion is a part of the finger pad of the jaw soft-rigid gripper and was made of thermoplastic polyurethane (TPU) using 3D printing technology. For the pin-penetrating setup, the use of a holding electromagnet and a magnetic holder were considered and verified by simulation as well as experiment. In further simulation studies, two design solutions using permanent magnets as the source of the magnetic field in the cushion volume to control MR fluid viscosity were considered. The primary aim of the study was to analyze the potential of using an MR fluid in a cushion pad and to investigate the potential for changing its viscosity using different magnetic field sources. The analysis included magnetic field simulations and tests of pin penetration in the cushion as an imitation of object grasping. Thus, an innovative application of 3D printing and TPU to work with MR fluid is proposed.

Magnetorheological Fluid for Levitation Migration Technology

2010 ◽  
Vol 148-149 ◽  
pp. 826-831
Author(s):  
Xu Lin Hu ◽  
Yang Guang ◽  
Pan Chao Cui
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Circuit Design ◽  
Magnetic Fluid ◽  
Magnetic Force ◽  
Magnetic Circuit ◽  
Magnetorheological Fluid ◽  
Directional Migration ◽  
Dispersed Particles ◽  
The Magnetic Field

The dispersed particles of magnetic fluid form stable chain-like clusters under the magnetic field, and shows “the flowing is controllable and the shape is controllable” effect. Based on this characteristic, using migration magnetic acted on the magnetic fluid, the object directional migration can be realize, then the magnetic fluid form ribbon at the same time, has the similar fluctuation behavior. The magnetic fluid aerosol migration principle, the aerosol magnetic circuit design, the magnetic field strength and the magnetic force were separately discussed in this paper. The magnetic fluid hover height using the MSL micrometer dial has determined and aerosol migration feasibility has confirmed using the experiment.

An experimental study on the effects of temperature and magnetic field strength on the magnetorheological fluid stability and MR effect

Soft Matter ◽  
2015 ◽  
Vol 11 (22) ◽  
pp. 4453-4460 ◽  
Author(s):  
Yahya Rabbani ◽  
Mahshid Ashtiani ◽  
Seyed Hassan Hashemabadi
Keyword(s):  
Magnetic Field ◽  
Experimental Study ◽  
Field Strength ◽  
Rheological Properties ◽  
Carbonyl Iron ◽  
Silicone Oil ◽  
Magnetorheological Fluid ◽  
Effects Of Temperature ◽  
The Stability ◽  
Mr Effect

In this study, the stability and rheological properties of a suspension of carbonyl iron microparticles (CIMs) in silicone oil were investigated within a temperature range of 10 to 85 °C.

Changes in the Resistance Force of a Magneto-Rheological Shock Absorber Induced by a Magnetic Field

2018 ◽  
Vol 915 ◽  
pp. 39-44
Author(s):  
Tatsuo Sawada ◽  
Takuma Endo ◽  
Yuzo Shimizu ◽  
Hitoshi Nishida
Keyword(s):  
Magnetic Field ◽  
Fluid Flow ◽  
Shear Flow ◽  
Applied Magnetic Field ◽  
Shock Absorber ◽  
Plug Flow ◽  
Resistance Force ◽  
Mr Fluid ◽  
Bingham Plastic ◽  
Magneto Rheological

In this study, we report the theoretical resistance force of a magneto-rheological (MR) shock absorber. We use the Bingham plastic model to theoretically represent the dynamic behavior of MR fluid flow in a circular pipe under the effect of a magnetic field. Because an MR fluid has yield stresses, the flow is divided into two regions: shear flow and plug flow. We reveal the relation between the resistance force of the MR shock absorber and the applied magnetic field. We conduct experiments and compare the experimental and analytical results to verify the theoretical approach.

Dynamic Viscoelasticity of a Magnetorheological Fluid in Oscillatory Slit Flow

1999 ◽  
Vol 13 (14n16) ◽  
pp. 2068-2076 ◽  
Author(s):  
Masami Nakano ◽  
Hideki Yamamoto ◽  
Mark R. Jolly
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Strain Amplitude ◽  
Loss Modulus ◽  
Plastic Property ◽  
Mr Fluid ◽  
Dynamic Viscoelasticity ◽  
Slit Flow ◽  
Tan Δ

The nonlinear dynamic viscoelasticity of an MR fluid in oscillatory slit flow under magnetic flux normal to the flow has been investigated by using a newly developed oscillatory pressure flow type rheometer. An MR fluid consisting of micron-sized, magnetically polarizable particles dispersed into a carrier medium is evaluated. The dynamic viscoelasticity remarkably depends on a fluid strain amplitude and a magnetic field strength. Both of the storage modulus (G′) and loss modulus (G″) increase dramatically with the increase of applied magnetic field strength H from 0 to 160 kA/m. And for the increase of the strain amplitude, both of them dramatically decrease, while the loss tangent ( tan δ) increases remarkably, showing the dominance of viscoelastic plastic property. The above results are discussed in terms of three deformation regions of the MR fluid; pre-yield, yield, post-yield.

Design and Development of Magnetorheological Fluid Machine for Flat Surface Finish

2020 ◽  
Vol 1013 ◽  
pp. 27-32
Author(s):  
Odwa Myataza ◽  
Khaled Abou-El-Hossein
Keyword(s):  
Magnetic Field ◽  
Surface Finish ◽  
Flat Surface ◽  
Low Cost ◽  
Magnetorheological Fluid ◽  
Surface Finishing ◽  
Design And Development ◽  
Mr Fluid ◽  
Motion System ◽  
Cnc Router

Surface finishing of glass and ceramics flats is difficult to perform using already existing traditional processes because of the brittle nature of these materials. In order to make traditional processes be able to accommodate these materials, relatively expensive aiding devices and approaches are required. The newly developed magnetorheological (MR) fluid finishing offers a solution to this problem at a relatively low cost. Magnetorheological fluids have been used in mechanical engineering applications because of the rheological behavior they possess under a magnetic field which enables the manipulation and pressure of loose abrasives on the machined surfaces and perform cutting action. This paper describes the design and development of an MR fluid machine-tool for flat surface finishing. The design presented herewith includes the design of the mechanical aspects of the ball-end tool machine and its support structure for a three-axis motion system. The objective of this study is realized based on utilizing a magnetic field, magnetorheological fluid and CNC router design to perform flat surface finishing.

scholarly journals THEORETICAL RESEARCH OF MAGNETORHEOLOGICAL SHOCK ABSORBER DAMPING FORCE / MAGNETOREOLOGINĮ SKYSTĮ NAUDOJANČIO SLOPINTUVO SLOPINIMO JĖGOS TEORINIAI TYRIMAI

2013 ◽  
Vol 5 (6) ◽  
pp. 671-675
Author(s):  
Andrius Klevinskis ◽  
Vytautas Bučinskas
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Shock Absorber ◽  
Theoretical Calculations ◽  
Theoretical Research ◽  
Damping Force ◽  
Heat Dispersion

In the article an overview of magnetorheological shock absorbertypes is presented, theoretical calculations of heat dispersion,magnetic field strength produced by shock absorber as well asmaximum power of electromagnet are provided. The article alsoprovides device damping force in line with a change of devicetemperature. In the end of the research the results of experimentare presented in the graph format as well as the conclusions. Santrauka Apžvelgti magnetoreologinį skystį (MR) naudojančių slopintuvų tipai, atlikti slopintuvo išskiriamos šilumos, sukuriamo magnetinio lauko skaičiavimai, nustatyta didžiausia leistinoji elektromagneto galia, apskaičiuota įrenginio sukuriama pasipriešinimo jėga, įvertinant įrenginio veikimo metu išskiriamos šilumos temperatūrą. Darbe pateikti tyrimo metu gautų rezultatų grafikai ir išvados.

PARTICLE DYNAMICS OF STRUCTURE FORMATION AND DISINTEGRATION IN A MODEL MAGNETORHEOLOGICAL FLUID

2002 ◽  
Vol 16 (17n18) ◽  
pp. 2314-2320 ◽  
Author(s):  
S. CUTILLAS ◽  
J. LIU
Keyword(s):  
Magnetic Field ◽  
Refractive Index ◽  
Correlation Function ◽  
Field Strength ◽  
Structure Formation ◽  
Magnetorheological Fluid ◽  
Particle Dynamics ◽  
Diffusing Wave Spectroscopy ◽  
Induced Structure ◽  
The Magnetic Field

Using diffusing-wave spectroscopy (DWS), we studied experimentally the particle dynamics for a density matched superparamagnetic polystyrene colloid in a refractive index nearly matched multiple-layered cell. Particle dynamics is probed during structure formation and disintegration, when a 0.2 Hz square-wave magnetic field was turned on for 4 s and off for 1 s. The correlation function shows that the particles move slower and more restricted when the magnetic field is on. Even during the off cycle of the magnetic field, the particles' motion is not free but still constrained with a less degree than that when the field is on. Thus, it takes more than 1 s for the induced structure to disintegrate. As the magnetic field strength increases, so does the degree of constrain for both the on and off cycle of the magnetic field and the differences between them. Modified telegrapher theory is found to be valid for our strongly absorbing and limited multiple scattering sample.

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