Research on a precision tension control system with a magnetic particle clutch as the actuator

Wang, Chunxiang; Yang, Rui; Yong-zhang, Wang; Lü, Hua

doi:10.1007/s00170-004-2190-8

Cited by 14 publications

(7 citation statements)

References 2 publications

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“…In clutches, MPs are uniformly distributed between two cylinders due to the magnetic excitation and shear stress at the surfaces, and no specific requirements for sealing are needed. Many studies have focused on ERFs and MRFs and their applications [5][6][7][8][9][10], but only a few studies have analyzed the properties and applications of MP actuators [11,12]. However, the research on MRFs can be referred when studying MPs, as they have similar properties, and a comparison between MRFs and MPs can also be achieved.…”

Section: Introductionmentioning

confidence: 99%

Squeeze behaviors of magnetic powders between two parallel plates

Chen

Tian

Shan

et al. 2014

Smart Mater. Struct.

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The dynamic compressive and static normal stresses of magnetic powders (MPs) with the constant volume squeezed between two parallel plates were experimentally studied. The compressive stress increased in a power law as the gap distance decreased, with an exponent range of −0.73 (0.04 T) to −2.63 (0.77 T). The values of the scale factor to normalize the compressive curves were mainly dominated by the applied magnetic field. The compressive behavior of the MPs showed a less significant velocity effect and initial gap distance effect than those of the magnetorheological (MR) and electrorheological (ER) fluids because of the absence of a host liquid. The compressive stress was generated by the serious particle aggregation, which was induced by a magnetic field and friction during compression. This study is designed to further the understanding of the behavior of smart ER/MR materials and the application of MP actuators in squeeze mode.

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Section: Introductionmentioning

confidence: 99%

Squeeze behaviors of magnetic powders between two parallel plates

Chen

Tian

Shan

et al. 2014

Smart Mater. Struct.

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“…Magnetic powders can form chain structures under magnetic fields with reversible and controllable shear stress, similar to electrorheological (ER) fluids and magnetorheological (MR) fluids [1]. Due to their rheological properties, magnetic powders (MPs) are widely used in actuators, such as clutches and brakes [2][3][4]. Compared with ER fluids and MR fluids, MP has a low demand in seal and a high efficiency of rheological effect (i.e., the ratio of shear stress under magnetic field to the field-off shear stress).…”

Section: Introductionmentioning

confidence: 99%

The rheological properties of magnetic field excited magnetic powders sheared between two parallel plates

Chen

Tian

Shan

et al. 2013

Smart Mater. Struct.

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The rheological properties of magnetic powders (MPs) excited by magnetic fields under parallel-plate shear were experimentally studied. The results showed that the shear stress increased with increasing magnetic field strength and volume fraction. It was also influenced by the plate gap distance, and was independent of the shear rate. The shear stress could be ascribed to the contributions of magnetic force and friction force, dominated by the normal force, the shear strain and the friction coefficient. The ratio of shear stress to normal stress, a form of friction coefficient, was influenced by volume fraction, magnetic field strength and gap distance. These results provide a better understanding of the mechanisms of magnetic field excited magnetic powders under parallel-plate shear.

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“…Roving spool brake systems can apply resistance mechanically via a spring system, pneumatically or electrically via an electromagnet. [ 22,186–188 ] Fiber tension has to be adjusted high enough to achieve sufficient resin impregnation but low enough so that no severe damage occurs to the filaments of the roving. [ 189 ] Filaments in a roving have small diameters that may be as low as 7 μm for carbon and 15 μm for glass fibers.…”

Section: Main Effects On the Roving During Processingmentioning

confidence: 99%

An overview on current manufacturing technologies: Processing continuous rovings impregnated with thermoset resin

et al. 2021

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The demand for products made of fiber‐reinforced polymer composites (FRPC) is constantly growing. These lightweight products are characterized by high stiffness, high tensile strength, and high service life. FRPC processes that employ thermoset‐impregnated continuous rovings are easily automated and provide the products with the highest unidirectional tensile strength. A critical disadvantage of continuous fiber‐reinforced polymers is caused by relatively high production costs. Among others, three main factors contribute to these production costs: (1) material costs, especially when carbon fibers are used, (2) costs for manufacturing semi‐finished products, such as textiles or preimpregnated fabrics, and (3) costs for waste occurring along the entire chain of process steps. In this context, one group of processes shows outstanding characteristics: processes in which rovings are in situ impregnated with a thermoset resin and then directly processed. Wet filament winding and pultrusion are the most popular but not the only representatives of this group. For all these processes, in situ impregnation is the key element, and various technologies have been developed for this purpose, each with its own unique fluid‐mechanical effects on rovings. A fundamental understanding of these effects is crucial to achieve products of the utmost quality. The paper at hand provides an overview of manufacturing processes that employ in situ impregnation of continuous rovings, specifically focusing on impregnation technologies. On this basis, phenomenological models describing the effects on the rovings during processing (impregnation, tension, and spreading) are reviewed.

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Research on a precision tension control system with a magnetic particle clutch as the actuator

Cited by 14 publications

References 2 publications

Squeeze behaviors of magnetic powders between two parallel plates

Squeeze behaviors of magnetic powders between two parallel plates

The rheological properties of magnetic field excited magnetic powders sheared between two parallel plates

An overview on current manufacturing technologies: Processing continuous rovings impregnated with thermoset resin

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