Papers by Author: Shi Rong Ge

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Authors: Ming Song, Shi Rong Ge, Hai Feng Fang
Abstract: In order to research the problem of rescue chamber colliding with the tunnel wall. The theoretical model of rescue chamber has been formed, based on the principle of energy conservation, by using theories of plates and shells, large deformed plate and shell, and by analysis of dynamic response of mine rescue chamber under axial impact load. This model includes initial velocity, contact force deformation energy and shell deformation. Dytran software was applied to build the finite element model of the rescue chamber contacting the rigid plate. Through comparison emulation result and theoretical analysis result, this model is proved to be highly reliable. The theoretical calculation and the simulation indicated that there were obvious relationships among the ability of the mine rescue chamber under axial impact load with the thickness, depth of flat spherical shells. If the thickness or depth increases, then the chamber could stand more. It is also confirmed that increasing the depth of flat spherical shells can minish the impact force for making impact process abate, which provides a basis for the research of rescue chamber.
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Authors: Hai Feng Fang, Shi Rong Ge, Ming Song
Abstract: In order to improve the heat-insulating capability of the refuge chamber’s shell and reduce energy consumption of the cooling system, the horizontal cylindrical mobile refuge chamber for coal mine was taken as the research object. By selecting two connection types between the inner shell and the outer shell for calculation, which were direct connection type and indirect connection type, and comparing these with the connectionless heat transfer, the heat transfer process in the refuge chamber subjected to thermal loadings of constant temperature was respectively discussed with numerical analysis method. Effect of heat bridges to heat transfer of the refuge chamber’s shell was analyzed. The analysis results showed that the average heat flux through direct connection heat bridge and indirect connection heat bridge had respectively increased by 668% and 30% than that of the connectionless heat transfer. The influencing scope of the former was larger than the latter’s. And more heat entered the refuge chamber through the direct connection heat bridge. Therefore, the indirect connection type should be used in the design of the refuge chamber’s shell.
624
Authors: Jin Long Liu, Hong Tao Liu, Shi Rong Ge, Chang Hui Xie
Abstract: Radar graph fractal method is an effective description for the contour of wear debris. In this paper the principle that radar graph fractal dimension analyzed by computer was researched. In analysis, how to extract contour of wear debris from surrounding is looked as an important process, and three methods was introduced to deal with it: manual method is simple to do, but the result is not accurate for the process could be affected by human mistake; automatic method can deal with the case that multi-wear debris being in an graph, and do the statistic for the result, but it is not good for the graph that wear debris’ gray is similar to surrounding’s, the wear debris contour gotten by this method is often distortional, so the concepts that edge dot extracted ratio and the optimizing threshold method can be introduced to improve it; Semi-automatic method is easy to modify the gotten wear debris contour by change the contrast of graph and the gray of edge dot extracted artificially, improve the definition of wear debris contour. The method radar graph fractal dimension analyzed by computer is more simple and convenient than by hand, its result is also more accurate, better for the using of radar graph fractal description.
1484
Authors: Hai Feng Yang, Yan Qing Wang, Lei Liu, Liang Fang, Shi Rong Ge
Abstract: Fabrication of friction reducing and anti-wear surface with regular micro/nanostructures is a hotspot of surface engineering studies nowadays. We present a simple and easily-controlled method for fabricating stainless steel-based nanostructures surface. First, by strictly controlling the number of femtosecond laser pulses, two kinds of nanostructures are fabricated. Then, forming mechanisms of nanodots and ripple structure are analyzed. Lastly, we obtained uniform large-area nanodots and ripple structures by adjusting the repetition rate of laser focus accurately. Therefore, this technique will provide a good method to investigate the tribological properties of controllable nanotexture surface.
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Authors: Yun Wang Li, Shi Rong Ge, Hua Zhu
Abstract: The explosion-proof design for coal mine robots that are used to explore environment and rescue after coal mine disaster must be adopted. In order to carry out the explosion-proof design for coal mine robots reasonably, based on the analysis of coal mine robots and their explosion-proof design, the explosion-proof types for robots are studied on. The conclusions are as follows: (1) the mixed explosion-proof design including integrated and partial explosion-proof design can be adopted in the robots design; (2) protection types for robots mainly include flameproof enclosure, pressurized enclosure, intrinsic safety, and combination of them. Based on this, the explosion-proof structures of the mobile systems of a track-type robot and a rocker-type robot for coal mine environment exploration are introduced. According to the different structure of the two robots, the concentrated and dispersed flameproof enclosures are respectively designed for the track-type robot and a rocker-type robot. This paper can provide reference for the explosion-proof design for coal mine robots.
1194
Authors: Yun Wang Li, Shi Rong Ge, Hua Zhu, Hai Feng Fang
Abstract: Based on the configurations of the track type travel mechanism, instead of wheels, the tracks were introduced into the rocker-type robot mobile system, and various configurations of the rocker-type track suspensions were obtained. Through analyzing characteristics of the suspensions, a rocker-type unsymmetrical W-shaped track mobile system was presented. The rear main tracks of the W-shaped tracks were longer than the front ones. The prototype’s obstacles-surmounting capabilities including ditch-crossing, step and stairs-climbing were analyzed. The prototype could climb up a 320mm-high step, climb down a 520mm-high step, cross a 490mm-wide ditch. The capabilities analysis and prototype test results indicated that the rocker-type unsymmetrical W-shaped track mobile platform had excellent passive adaptability to rugged unstructured terrain environments and strong obstacles-surmounting capabilities.
609
Authors: Shi Bo Wang, Shi Rong Ge
Abstract: The friction and wear behavior of nylon1010 composites filled with different proportions of ZnOw in reciprocating sliding against GCr15 steel ball under dry friction condition were studied. The worn surface and wear particles were then examined with SEM. The elastic modulus, nano-hardness and ball indentation hardness of composites increased with the content of ZnOw. The coefficients of friction of composites decreased lightly, which changed from 0.36 and 0.26 of nylon matrix to 0.30 and 0.22 of composites at 0.04 m/s and 0.08m/s sliding velocity, respectively. The anti-wear property of composites was improved with large extent. The typical wear mechanism of nylon matrix is adhesion and micro-melting. However, peeling of surface layer appears owing to fatigue for composites. Roll-shaped wear debris were produced for pure nylon, while flake-like debris for nylon composites.
801
Authors: Shi Rong Ge, Chuan Hui Huang
Abstract: The fatigue wear behavior of PA1010 composites filled with metal oxide particles was experimentally investigated. The nylon composites were prepared by compression molding method with different contents of PA1010 and CuO, Fe3O4, Al2O3 particles. The rolling contact counterpart for nylon composite samples was 1045 carbon steel ring. The rolling contact tests were performed on M-2000 wear test machine in dry friction condition. It was found that the fatigue wear measured in mass loss of nylon composites increases to rolling contact cycles. Most of the samples show an approximately linear relationship between wear mass loss and rolling cycles. Three kinds of metal oxide particles have different effects on the fatigue wear behavior of nylon composites. The contents of metal oxide particles have important influence on the fatigue wear behavior. The nylon composites filled with CuO (30 wt.%) or Fe2O3 (30 wt.%) will result in the comparatively highest wear resistance, the wear mass loss reduces to about 70% of pure nylon. Al2O3 particles is not a good choice for increasing the rolling wear resistance of nylon composites. It is found that the contact fatigue controls the wear mechanism of nylon composites under rolling contact.
860
Authors: Yan Qing Wang, Hai Feng Yang, Qing Gong Han, Liang Fang, Shi Rong Ge
Abstract: Surface roughening, with certain roughness topography, is thought to be as an effective tribological method of decreasing friction coefficient of kinematic pairs. Friction and wear of AISI1045 steel surface roughened by convenient and economical way of sandblasting was investigated under lubrication conditions. Roughened and polished samples run against Φ4mm GCr15 pin lubricated by engine oil were tested in reciprocating mode with different load and speed on UMT- testing machine. It is found that there exists the optima surface roughness (Ra is about 3.92μm) roughened by sandblasting in which the least wettability contact angle between engine oil and textured steel surface is obtained, hence the lowest friction coefficient and wear rate is due to the optima hydrodynamic sliding property, although the sliding surface was not in hydrodynamic lubrication state.
1019
Authors: Shi Bo Wang, Zi Feng Ni, Shi Rong Ge
Abstract: The cross-linked UHMWPE mixed with Vitamin E (VE) was prepared by hot press and then irradiated with gamma radial of 100 kGy does. The scratch hardness, micro-hardness and cross-linking density of cross-linked UHMWPE was measured. The tribilogical behavior also was examined. The experimental results indicated that the scratch hardness and micro-hardness of irradiation virgin and NC/UHMWPE are higher than that of virgin UHMWPE. Mixing VE decreased the cross-linking density of irradiated UHMWPE. Friction coefficients of virgin and cross-linked UHMWPE were seldom affected by irradiation and mixing VE. It was ranged from 0.35 to 0.37. Wear rate of virgin and cross-linked UHMWPE were strongly influenced by irradiation and mixing VE. Wear rate had an inverse proportional to the scratch hardness. The cross-linking and mixing VE in UHMWPE change the severity of adhesive wear of UHMWPE. For virgin UHMWPE, irradiated virgin UHMWPE and 0.1wt%VE/UHMWPE, the severity of adhesive wear was gradually decreased. Besides adhesion, poluging was the wear mechanism of irradiated 0.3wt%VE/UHMWPE.
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