Characterization of an on-body quasi-static channel in underground mine environment

AbstractThis paper presents an approach to access real time data from underground mine. Two advance technologies are presented that can improve the adverse environmental effect of underground mine. Visible light communication (VLC) technology is incorporated to estimate the location of miners inside the mine. The distribution of signal to noise ratio (SNR) for VLC system is also studied. In the second part of the paper, long range (LoRa) technology is introduced for transmitting underground information to above the surface control room. This paper also includes details of the LoRa technology, and presents comparison of ranges with existing above the surface technologies.

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Cyclical salt efflorescence weathering: an invisible threat to the recovery of underground mine environment for tourist exploitation

Environmental Earth Sciences ◽

10.1007/s12665-014-3098-8 ◽

2014 ◽

Vol 72 (6) ◽

pp. 1901-1913 ◽

Cited By ~ 2

Author(s):

J. Matías Peñas Castejón ◽

J. Francisco Maciá Sánchez ◽

Mª Pilar Jiménez Medina ◽

Mª Jesús Peñalver Martínez

Keyword(s):

Underground Mine ◽

Mine Environment ◽

Salt Efflorescence

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Development of a Novel Underground Mine Reconnaissance Robot

10.26686/wgtn.17143853.v1 ◽

2021 ◽

Author(s):

◽

Nick Thompson

Keyword(s):

Underground Mining ◽

Operating Time ◽

Underground Mine ◽

Positive Pressure ◽

Rough Terrain ◽

Planetary Gearbox ◽

Brushless Dc ◽

Mine Environment ◽

Locomotion System ◽

Lip Seals

<p>Despite advancements in safety technology, underground mining disasters kill hundreds of people each year. Typically after a disaster, a manned response team will enter the hazardous mine to ascertain its condition and rescue any survivors. A robotic entry platform could significantly reduce the risk to the response teams and the time taken to recover any survivors. However, existing mine search and rescue robots have had limited success in past disasters. Two primary aspects caused the failure of the existing platforms; poor rough terrain ability and lack of ingress protection for the harsh mine environment. HADES, a novel underground mine reconnaissance robot is developed to address these issues. A lightweight yet robust chassis is manufactured from fibreglass. To allow HADES to operate in the potentially explosive atmosphere, the chassis is protected with a positive pressure gas system, designed to meet the ANZ60079.29 standard. This chassis is sealed against the mine environment with a series of O-rings and lip seals. Whegs are used as the primary locomotion method and are driven with a planetary gearbox and a brushless DC motor. To further improve a rough terrain capability of the locomotion system the rear arm of the chassis is mounted on an actuated pivot, increasing the rough terrain capability of HADES. To ensure the operator can successfully assess and navigate the mine, HADES carries a comprehensive set of environmental and navigation sensors. The internal electronics and locomotion systems are powered with six Li-Po batteries that achieve an operating time of six hours and an expected range of 25 km. HADES is 780x800x400 mm and is mostly sealed to the IP68 standard. The locomotion system is robust and can traverse the majority of the terrain expected in an underground mine. Loss of traction is the only problem encountered with the Wheg design. However, this can be easily fixed by changing the tip shape of the Wheg.</p>

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