Three-Dimensional DV-Hop Location Technology for Coal Mine Based on WSNs

2017 ◽  
Author(s):  
Wangsheng Fang ◽  
Yezhen Luo ◽  
Ying Huang
Keyword(s):  
Coal Mine ◽  
Three Dimensional

scholarly journals Prediction of the spatial variability of coal-bearing rocks at the Elginsky coal mine

2020 ◽  
Vol 192 ◽  
pp. 04007
Author(s):  
Yuri Malinin ◽  
Nikolai Grib ◽  
Pavel Kuznetsov ◽  
Zhang Ze
Keyword(s):  
Spatial Variability ◽  
Cross Sections ◽  
Coal Mine ◽  
Three Dimensional ◽  
Spatial Modelling ◽  
Ash Content ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Markov Modelling ◽  
Composition Structure

The article presents a brief analysis of the key methods used for spatial modelling of mining and geological indicators describing the composition, structure and state of rock deposits. The main limitations of the analysed methods when applied under real conditions are outlined. It is proposed to overcome these limitations using Markov nonlinear algorithms. By applying the principles of multi-dimensional Markov modelling to a geological object, interval types were determined for modelling mining and geological parameters of the Elginsky coal mine. As an example, the article presents the results of predicting the ash content for the U5 section of the Elginsky coal mine on the basis of one of the cross-sections of the developed three-dimensional model.

Geo-Stress Measurement and its Application in the Yangchangwan Coal Mine

2013 ◽  
Vol 353-356 ◽  
pp. 398-402
Author(s):  
Xiao Yu Zhang ◽  
Feng Ming Liu ◽  
Gang Chen
Keyword(s):  
Stability Analysis ◽  
Coal Mine ◽  
Basic Parameter ◽  
Stress Measurement ◽  
Three Dimensional ◽  
Stress Relief ◽  
Tectonic Stress ◽  
Surrounding Rock ◽  
Support Design ◽  
Rock Stability

The initial stress of rock is a basic parameter, which can be used for surrounding rock stability analysis, exploitation and support design. By utilizing stress relief method of hollow inclusion with its characters of high precision and obtaining three dimensional stress at one time, we have measured three dimensional stress magnitude and direction in north wing roadway (-850m) and 710 open-off cut (-1000m), respectively. The results show that the horizontal tectonic stress is obvious in this coal area.

scholarly journals Comprehensive Measurement of the Deformation and Failure of Floor Rocks: A Case Study of the Xinglongzhuang Coal Mine

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Hao Liu ◽  
Pu Wang ◽  
Weihe Zhang ◽  
Qiang Liu ◽  
Lijun Su
Keyword(s):  
Coal Mine ◽  
Abutment Pressure ◽  
Three Dimensional ◽  
Strain Sensing ◽  
Floor Rock ◽  
Deformation And Failure ◽  
Working Face ◽  
Floor Failure ◽  
Coal Wall ◽  
Different Depths

The isolated island panel 10304 of the Xinglongzhuang coal mine was used as the research subject to study the deformation and damage characteristics of the coal seam floor. The damage of the floor was studied using the borehole strain sensing method and borehole imaging technology, and FLAC3D was used to study the influence of abutment pressure on floor failure. The result shows that the floor under the superimposed area which is affected by lateral and advanced abutment pressure is damaged firstly, and the maximum depth reaches 26 m, other areas of the working face about 23 m. The degree of deformation and failure of floor rock at different depths is decreased. The deformation damage increases with the advancement of the working face until a certain distance at the same depth. The hole image can clearly show the influence range of the abutment pressure in front of the coal wall and influence the degree of the advancement and lag by means of the strain increment curve for each sensor probe and the images from different drilled positions. On the basis that the results of simulation and field measurement are consistent, the results can reflect the three-dimensional failure characteristics of the whole island working face floor in the process of coal mining more comprehensively and accurately; moreover, they also can provide important information for mine flood prevention and ecological environment protection.

Research on Buckling Mechanism of U Type Steel Support’s Pinnas Based on ANSYS

2012 ◽  
Vol 466-467 ◽  
pp. 1271-1274
Author(s):  
Jian Zhuang Liu ◽  
Jia Li ◽  
Li Gan ◽  
Fang Fang Du
Keyword(s):  
Stress Distribution ◽  
Cross Section ◽  
Coal Mine ◽  
Optimization Design ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Type Steel ◽  
Buckling Failure ◽  
Simulation Results ◽  
Three Dimensional Models

The prevenient mechanical research on U type steel support focuses on two dimensional analysis in the installing plan. Interested in the buckling failure of U type steel support’s pinnas in one coal mine of Huainan Group, the authors build three dimensional models to stimulating 25U and 29U support. The appealing simulation results verify ANSYS’s 3-D computational capabilities about complicated section support. The main objective of their investigation has been to obtain some knowledge of the mechanism, stress distribution, and load magnitude in the support’s deforming. Further, the deviating longitudinal load play an accelerating deformation role on its distorting, which should be paied more attention to cross-section optimization, design of support parameters, and installing way of steel lacing.

scholarly journals The Encountered Problems and Solutions in the Development of Coal Mine Rescue Robot

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Yong Wang ◽  
Peng Tian ◽  
Yu Zhou ◽  
Qing Chen
Keyword(s):  
Coal Mine ◽  
Three Dimensional ◽  
Fiber Material ◽  
Field Testing ◽  
Market Demand ◽  
Rescue Robot ◽  
Virtual Test ◽  
Carbon Fiber Material ◽  
Problems And Solutions ◽  
Technology Market

Based on the various problems in the process of coal robot applications, from three-dimensional analysis of the key technology, market demand, and policy regulations and standardization, the paper reviews the use of carbon fiber material, elastic material of traditional surface spraying and integral casting technology to realize lightweight robot, by using the dual redundant design to improve the reliability of the rescue robot CPU, through the functions of voice recognition obstacle sensor, gas sensor acquisition components, and distribution information to realize the underground rescue mission. In addition, virtual test technology, hardware in the loop simulation technology, and shrinkage model technology are proposed to solve the difficulties of hard field testing of rescue robots. These suggest that concrete measures have been pointed out to break the problem of the development of the coal mine relief robot.

Analysis on Obstacle-Surmounting of Coal Mine Detection Robot with Mechanical Arm

2014 ◽  
Vol 494-495 ◽  
pp. 1324-1327
Author(s):  
Han Hu ◽  
Zhi Gang Niu
Keyword(s):  
Barrier Height ◽  
Coal Mine ◽  
Three Dimensional ◽  
Euler Angle ◽  
Mine Detection ◽  
Initial State ◽  
Load Effect ◽  
Swing Angle ◽  
Centroid Coordinates ◽  
Robot Body

This paper took the coal mine detection robot model TUT-CMDR for research. First of all, the three degrees freedom mechanical arm was installed on the robots body. By the same time, the theory of Euler angle and D-H method were established to analysis the posture and position of robot body and mechanical arm. After the integration, the centroid coordinates on the robot in any location was calculated. In the next place, mechanical arm angle change and the size of the load effect on both forward obstacle-surmounting and the barrier height were discussed. In the end, the three dimensional relationship diagrams of barrier height, barycenter, pitch angle, arms' swing angle and mechanical arms swing angle were drawn and the results of mechanical arm gesture planning were compared with the initial state. The theory will provide basis for robot obstacle-navigation control.

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