Development of Non-Sedimentation Type Damper

邦雄, 島田; 秀人, 菅野; 淳二, 小川; 成光, 須知; 新一, 神山

doi:10.1299/kikaib.69.2075

Cited by 4 publications

(5 citation statements)

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“…When eE o is the applied voltage, the voltage eE at the regions of γ and k is given as (9). Therefore, we calculate (7)…”

Section: Quantum Theorymentioning

confidence: 99%

“…Since we have come to understand the behavior of the magnetic clusters, MCF has become a candidate for many engineering applications as discussed by Shimada et al [6]. For example, MCF has been used effectively as a damper in the fields of architecture and vibrating machines as discussed by Shimada et al [7] and by Kanno et al [8,9] and for magnetic fluid polishing by as discussed Wu et al [10] and by Shimada et al [11,12]. These damping and polishing effects are enhanced by the magnetic clusters in the MCF, and the effects are greater than those with ordinary MF or MRF dampers and ordinary MF or MRF polishing.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical Investigation by Quantum Mechanics on the Tunnel Diode Effect of Electric Conductive Characteristics and Haptic Sensing in MCF Rubber

Shimada

2010

Journal of Sensors

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By applying our developed intelligent fluid, magnetic compound fluid (MCF), to silicon oil rubber, we have made the MCF rubber highly sensitive to temperature and electric conduction. MCF is useful as the element material in haptic robot sensors and other related devices. In the present paper, we clarified the relationship between the electric current and the voltage under a tensile strain by utilizing the quantum mechanics theory on the multibarrier potential problem. The experimental results could be qualitatively explained by our proposed theory. The electrons can be moved between the solid materials by the tunnel effect. The relation between voltage and electric current is affected by the formation of the clusters, and it is changed by the application of heat. We also clarified experimentally the present MCF rubber useful in haptic sensors. Because the motions of humans and robots are different, the sensing of the rubber is different, depending on the placement. However, as for both motions of human and robot, there is no quantitative difference in the electric resistance among kinetic energy, momentum, and force. The sensing is also different based on the stiffness of the surface to which the sensor is adhered.

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“…When eE o is the applied voltage, the voltage eE at the regions of γ and k is given as (9). Therefore, we calculate (7)…”

Section: Quantum Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theoretical Investigation by Quantum Mechanics on the Tunnel Diode Effect of Electric Conductive Characteristics and Haptic Sensing in MCF Rubber

Shimada

2010

Journal of Sensors

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“…The efficacy of the magnetic clusters involved in the MCF at the various engineering applications, for example, damper [9]- [11], polishing [12]- [17], and MCF rubber made of silicon-oil rubber [18]- [21] has been clarified. The properties of their engineering applications changes to be enhanced by the behavior of the magnetic clusters controlled by the applied magnetic field, comparing to those in the case of utilizing ordinary magnetic responsive fluids, for example, MF and magneto-rheological fluid which are called as another name, intelligent fluid.…”

Section: Introductionmentioning

confidence: 99%

Detailed Mechanism and Engineering Applicability of Electrolytic Polymerization Aided by a Magnetic Field in Natural Rubber by Mechanical Approach for Sensing (Part 1): The Effect of Experimental Conditions on Electrolytic Polymerization

Shimada¹,

Saga²

2016

WJM

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Ordinary electrolytic polymerization has involved plastic-type polymer solutions. Rubber, especially natural rubber, is one such polymer solution. Rubber has not been focused on until recently due to the fact that electrolytic polymerization has only a very small effect on rubber. However, when we focus on the C=C bonds of natural rubber, the same electrolytic polymerization is applicable to be enlarged on the natural rubber if a magnetic field and a filler are added. With the application of a magnetic field and a magnetic responsive fluid such as magnetic compound fluid (MCF), the effect of electrolytic polymerization on NR-latex such as plastic-type polymer solutions is enhanced, and the thickness of the vulcanized MCF rubber grows in a short time. The present new method of vulcanization of MCF rubber is effective enough that it is widely used in haptic sensors in various engineering applications. In the present report, as mechanical approach for the sensing, by measuring the temperature under electrolytic polymerization, by investigating the electric and dynamic characteristics, and by observing the magnified appearance of the MCF rubber, we clarified the extrinsic effects of many experimental conditions, including magnetic field strength, applied voltage, the electrodes gap, mass concentration, and the ingredients of the MCF. This report is Part 1, to be followed by another sequential report, Part 2, in which other intrinsic effects on the characteristics are dealt with. The experimental conditions used and the results obtained in the present report provide valuable data that will be useful in the making of MCF rubber.

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“…Contrast to dissection analysis by Wang et al, the authors acknowledged that the outcomes were only shown in the scale of the whole damper but not at the material level because not having access to the fluid or to the inner structure of the device. Shimada et al [25] imagined a non-sedimentation type MR damper by using permanent magnet settled in a cylinder, however, only magnetic particles absorbed by the magnets was displayed and another type of dispersed particles aggregation was resulted.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic behaviors of settled magnetorheological fluid redispersion under active dispersing mechanism: simulation and experiment

Zou¹,

Zhang²,

Liao³

et al. 2022

Smart Mater. Struct.

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Despite several salient benefits of numerous control systems utilizing magnetorheological (MR) fluid, practical realization of commercial products is limited due to the particles sedimentation. To overcome this problem, several measures have been proposed to optimize MR fluid settling through the viewpoints of dispersing medium viscosity, suspension force of dispersed phase and additives innovation, but the settling of MR fluid can be alleviated to an extent only. An active dispersing mechanism (ADM) proposed in the previous work is one of attractive ways to resolve the sedimentation problem in a level of device and it is promising to fulfil good serviceability for MR dampers even if the settling remains. In this work, attributive to the investigations in stirring devices, rotary blades are employed to fulfil the redispersing of settled MR fluid under the theory of solid-liquid two phase flow. The parameters and working conditions of the rotary blades are optimized to guide experimental verification in a damper-sized vessel. The vessel can be seen as a prototype for real MR damper. An immersed induction method (IIM) for the characterization of the localized MR fluid concentration is proposed to designate the dispersing process when ADM is started. With the experiments of different MR fluid volume fractions and rotating speeds of the rotary blades, it is fully testified that the faster the blades rotate, the shorter the mixing time, and the more the inclination angle of blades close to 45°, the better the dispersion capability. In addition, it is also identified that the ADM is effective to disperse the settled MR fluid and promising to the sedimentation immunity of MR damper.

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Development of Non-Sedimentation Type Damper

Cited by 4 publications

References 0 publications

Theoretical Investigation by Quantum Mechanics on the Tunnel Diode Effect of Electric Conductive Characteristics and Haptic Sensing in MCF Rubber

Theoretical Investigation by Quantum Mechanics on the Tunnel Diode Effect of Electric Conductive Characteristics and Haptic Sensing in MCF Rubber

Detailed Mechanism and Engineering Applicability of Electrolytic Polymerization Aided by a Magnetic Field in Natural Rubber by Mechanical Approach for Sensing (Part 1): The Effect of Experimental Conditions on Electrolytic Polymerization

Hydrodynamic behaviors of settled magnetorheological fluid redispersion under active dispersing mechanism: simulation and experiment

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