Influence of Temperature on Generator Current and Magnetic Field of a Proximity Detection System

Details

• Personal Author:
  Carr J ; Li J ; Smith A ; Whisner B
• Description:
  Electromagnetic based proximity detection systems (PDSs) are utilized on mining machinery to protect workers from being pinned or struck. These systems generate magnetic fields covering the space around a machine, and a miner-wearable component (MWC) detects the field. The PDS determines the distance of miners relative to the machine based on the detected magnetic flux density in the magnetic field. This information is used to establish warning and shutdown zones around the machine. Maintaining a stable magnetic field is essential for system accuracy. However, components used to generate magnetic fields can be influenced by temperature changes. Depending on ventilation conditions and seasonal alternation, a PDS can be subject to significant temperature fluctuation. To better understand and quantify this phenomenon, researchers from the National Institute for Occupational Safety and Health (NIOSH) developed an experimental apparatus to study the influence of temperature on magnetic field generator circuits used in PDSs. Results from the study show that the electric current through a generator can be influenced by both ambient and internal temperatures, modifying the magnetic field that is produced. These findings show that temperature can significantly influence the ability of PDSs, used in underground coal mines, to accurately determine a worker's position in relation to mining machine. [Description provided by NIOSH]
• Subjects:
  Accident Prevention Accidents Electromagnetic Fields Mining Occupational Health Personal Protective Equipment Safety Temperature Ventilation
• Keywords:
  Accident Prevention Continuous Mining Detectors Electrical Conductivity Electrical Generators Electrical Transmission Electric Properties Electromagnetic Fields Electromagnetic Interference Electromechanical Systems EMF Environmental Technology Equipment Reliability Equipment Testing Magnetic Fields Magnetic Properties Materials Testing Miners Mine Safety Mining-industry Mining Equipment Mobile Equipment Performance Tests Protective Equipment Proximity Detection Seasonal Factors Temperature Effects Warning Signals Warning Systems Wearable Technologies

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• Series:
  Mining Publications
• Publisher:
  Society for Mining, Metallurgy, and Exploration, Inc.
• Document Type:
  Text
• Genre:
  Proceedings
• Place as Subject:
  Colorado ; Minnesota ; OSHA Region 3 ; OSHA Region 5 ; OSHA Region 8 ; Pennsylvania
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  PMRD - Pittsburgh Mining Research Division
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-4
• NIOSHTIC Number:
  nn:20051353
• Citation:
  2018 SME Annual Meeting, February 25-28, 2018, Minneapolis, Minnesota, preprint 18-051. Englewood, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2018 Feb; :1-4
• Contact Point Address:
  J. Li, NIOSH, Pittsburgh, PA
• Federal Fiscal Year:
  2018
• NORA Priority Area:
  Mining
• Peer Reviewed:
  False
• Source Full Name:
  2018 SME Annual Meeting, February 25-28, 2018, Minneapolis, Minnesota, preprint 18-051
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:a1d7f98dd8f1881cfa13e6997a27f70c8f66ed5b441fe1c3c861bae2182445b7d12b3beca421b1181013b93ea73b57813f82a0130da573a516d12d94d847e892
• Download URL:
  https://stacks.cdc.gov/view/cdc/227660/cdc_227660_DS1.pdf
• File Type:
  [PDF - 253.73 KB ]