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501 results on '"Cai, Jianguo"'

5. Migration and distribution patterns of cutting dust in a continuous mining face under ventilation disturbance

Author

HUANG Chao, TANG Mingyun, WANG Lele, CAI Jianguo, and YUAN Yanan

Subjects
continuous mining face, cutting dust, dust migration, dust concentration, particle size distribution, Mining engineering. Metallurgy, TN1-997
Abstract

To understand the migration and distribution patterns of cutting dust in the continuous mining face under ventilation disturbance, the 15218 continuous mining face of the Hongliulin Coal Mine in Shaanxi was taken as the research object. A physical model of the continuous mining face was constructed using SolidWorks. Based on the Euler-Lagrange method, CFD software was employed to numerically simulate the airflow field, dust concentration distribution, and dust particle size distribution. The results showed that: ① Most of the dust-laden airflow in the continuous mining face migrated toward the return air side. Dust primarily accumulated in the triangular area beneath the cutting drum of the continuous miner and in the region from the tail of the continuous miner to the middle of the tunnel. ② Dust accumulation was less in the vortex zone, with some dust accumulating in the shuttle car. In the wake zone, dust formed a concave, strip-like cloud. ③ As the dust-laden airflow moved toward the tunnel exit, coarse dust settled the most, followed by fine dust, while ultrafine dust settled the least. The quantities of ultrafine dust, fine dust, and coarse dust initially increased and then decreased with the increase in tunnel height. The quantities of ultrafine dust, fine dust, and coarse dust decreased as the distance from the mining face and the return air side tunnel wall increased. ④ The dust concentration and area at the breathing zone height decreased as wind speed increased. The proportions of ultrafine dust, fine dust, and coarse dust were approximately 15%, 54%, and 31%, respectively, and were generally unaffected by changes in wind speed. ⑤ A wind speed of 1.6 m/s facilitated dust removal in the breathing zone plane but also lifted more dust into the breathing zone, making it necessary to appropriately increase the wind speed for global dust removal while implementing targeted measures for localized dust control.

Published
2024
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49. Mechanical and shape-memory properties of TPMS with hybrid configurations and materials.

Author

Liu, Tianzhen, Zhao, Wei, Yao, Yongtao, Lin, Cheng, Zhao, Hanxing, and Cai, Jianguo

Subjects
HYBRID materials, VISCOELASTIC materials, SMART materials, MINIMAL surfaces, VIBRATION isolation
Abstract

Triply periodic minimal surface (TPMS) structures with excellent properties of stable energy absorption, light weight, and high specific strength could potentially spark immense interest for novel and programmable functions by combining smart materials, e.g. shape memory polymers (SMPs). This work proposes TPMS lattices with hybrid configurations and materials that are composed of viscoelastic and shape-memory materials with the aim to bring temperature-dependent mechanical properties and additional dissipation mechanisms. Different configurations and diverse materials of polylactic acid (PLA), fiber-reinforced PLA, and polydimethylsiloxane (PDMS) are induced, generating five types of TPMS lattices, including (Schoen's I-WP) IWP uniform lattice, IWP lattice with density gradient, hybrid configurations, hybrid materials, and filled PDMS, which are fabricated by 3D printing. The fracture morphologies and the distribution of carbon fibers are demonstrated via scanning electron microscopy with a focus on the influence of carbon fiber on shape-memory and mechanical properties. Shape recovery tests are conducted, which proves good shape memory properties and reusable capability of TPMS lattice. The combined methods of experiments and numerical simulation are adopted to evaluate mechanical properties, which presents multi-stage energy absorption ability and tunable vibration isolation performances associated with temperature and hybridization designs. This work can promote extensive research and provide substantial opportunities for TPMS lattices in the development of functional applications. [ABSTRACT FROM AUTHOR]

Published
2024
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