Results 1 - 9 of 9

• Measurement of the Influence of Antennas on Radio Signal Propagation in Underground Mines and Tunnels
  10/4/2019 - Peer reviewed journal articles
  This paper reports the influence of antennas on radio signal propagation in tunnels and underground mines.
• Ray Tracing and Modal Methods for Modeling Radio Propagation in Tunnels With Rough Walls
  5/1/2017 - Peer reviewed journal articles
  An article that discusses how wall roughness affects radio propagation in tunnels, and presents a unified ray tracing and modal method for modeling radio propagation in tunnels with rough walls.
• Modeling Natural Gas Explosions for Coal Mine Safety
  7/19/2016 - Contracts and cooperative agreements
  A contract to simulate the development and evolution of natural gas (NG) explosions in mine tunnels.
• Straight Line Walking and Path-Turn Identifying Algorithms for a Tracking Device Used in Underground Mines
  1/1/2010 - Conference papers
  This paper describes two algorithms that can provide greater accuracy for underground miner tracking systems.
• The Critical Ventilation Velocity in Tunnel Fires - A Computer Simulation
  4/1/2005 - Peer reviewed journal articles
  Discusses a study that used a CFD program (fire dynamics simulator) based on large eddy simulations (LES) to model floor-level fires in a ventilated tunnel. The CFD results are compared with two simple theories of critical ventilation.
• Investigation of the Jacking Force Capability of Tunnel Liners
  2/1/2002 - Conference papers
  Steel liner plates are used to provide protective linings in the tunneling industry. This report summarizes test results, examines design parameters that impact jacking force capability, and develops models to improve design load prediction.
• CFD Modeling of Smoke Reversal
  6/1/2001 - Conference papers
  In the present study, a computational fluid dynamics (CFD) program is used as a design tool to model floor-level fires in a ventilated tunnel.
• Propagation of UHF Radio Waves in Limestone Room and Pillar Mines
  1/1/1979 - Contract reports
  This report presents a mathematical model for the propagation of UHF radio waves in the large cross section tunnels of a room-and-pillar limestone mine and describes the analysis of a small amount of propagation data obtained. The model and analysis is ...
• Borehole Location System Concept Demonstration Tests
  9/1/1978 - Contract reports
  This report describes the feasibility test of an electromagnetic method for locating boreholes, with or without casing, that have been drilled in conjunction with mining operations but without precisely known locations with respect to the tunnel.