Environmental impact on the magnetic field distribution of a magnetic proximity detection system in an underground coal mine

Li, Jingcheng; Carr, Jacob; Waynert, J. A.; Kovalchik, P.G.

doi:10.1080/09205071.2013.852487

Cited by 8 publications

(4 citation statements)

References 8 publications

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“…One of the limitations of the study is that the tests were conducted above the ground based on a simulated mesh entry without the presence of coal seam. The results, however, are expected to be applicable to the corresponding underground scenarios as the earth strata and coal seam have relatively small influence on the magnetic field distribution, as demonstrated in a prior NIOSH research project [12]. In addition, to avoid the influence caused by the mesh on the PDS, miners might be required to reposition himself away from the mesh.…”

Section: Discussionmentioning

confidence: 93%

Influence of Steel Mesh on Magnetic Proximity Detection Systems: An Experimental Study

Zhou¹,

Whisner²,

Carr³

et al. 2020

PIER M

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Proximity Detection Systems (PDSs) are used in the mining industry for protecting mine workers from striking, pinning, and crushing injuries when they work in close proximity to heavy machines such as continuous mining machines (CMMs). Currently all PDSs approved by the Mine Safety and Health Administration (MSHA) are magnetic field based systems which can be influenced by the presence of steel wire mesh that is commonly used for supporting roof and ribs in underground coal mines. In this paper, researchers at the National Institute for Occupational Safety and Health (NIOSH) characterized the influence of the mesh on the performance of magnetic PDSs by measuring the magnetic field difference around a CMM caused by the presence of the mesh. The results show that the magnetic fields are generally enhanced by the mesh which causes PDS detection zones to be increased correspondingly. It was discovered that the fields around the joints of two mesh sections have the greatest enhancement and thus deserve more attention. In addition, it was found that the presence of mesh can also cause a variation in the generator current. The experimental results show that the generator current variation and thus the magnetic field change caused by the mesh can be significant (on the order of ten) when the mesh is extremely close to the generator (e.g., less than 1 cm) and is negligible when mesh is relatively far (greater than 0.15 m). The findings in this paper can be used to develop guidelines and best practices to mitigate the influence of mesh on PDSs.

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Section: Discussionmentioning

confidence: 93%

Influence of Steel Mesh on Magnetic Proximity Detection Systems: An Experimental Study

Zhou¹,

Whisner²,

Carr³

et al. 2020

PIER M

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“…The basic setup for B-I measurements Fig. 9 provides a representative plot of the B-I measurements at a particular location for the generator introduced in Section II, and the least squares linear fit equation, which can be considered as an empirical B/I model, and is given again in (13). A generalized B/I relationship for a ferrite-cored coil is then given in (14).…”

Section: -Mic-0263mentioning

confidence: 99%

“…The baseline model of a transferrable model can be considered as the model providing the generic near-field distribution pattern. Any distribution pattern change due to the influence of nearby steel and metal parts can be identified, quantitatively analyzed, and modeled [13]. This can lead to a magnetic field model with the compensation of the environment factors possibly resulting in a higher adaptability of the system to different operating environments.…”

Section: A Test For the Transferrable Modelmentioning

confidence: 99%

A transferrable shell-based magnetic flux density distribution model for a magnetic proximity detection system

Carr

Smith

et al. 2014

2014 IEEE Industry Application Society Annual Meeting

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A magnetic proximity detection system relies on magnetic flux density measurement to determine the position of a worker relative to a mobile mining machine. It is desirable for the magnetic flux density distribution to be automatically adjustable to conform to the protection requirements for the different types of machines and working environments. In support of the development of an automatic field distribution adjustment process, we developed a transferrable magnetic flux density distribution model. The transferrable model can also be used to control and stabilize the field against field drift to enhance system performance.

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“…There are a number of environmental influences that affect the size and shape of the magnetic fields produced by proximity detection system generators. The influences of many environmental factors have been studied for proximity detection systems used in underground coal mines [79,92]. Temperature within an underground mine environment can fluctuate drastically [93].…”

Section: 6: Effect Of Temperature On Magnetic Field Generationmentioning

confidence: 99%

Electromagnetic Signal Feedback Control For Proximity Detection Systems

Smith¹

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Environmental impact on the magnetic field distribution of a magnetic proximity detection system in an underground coal mine

Cited by 8 publications

References 8 publications

Influence of Steel Mesh on Magnetic Proximity Detection Systems: An Experimental Study

Influence of Steel Mesh on Magnetic Proximity Detection Systems: An Experimental Study

A transferrable shell-based magnetic flux density distribution model for a magnetic proximity detection system

Electromagnetic Signal Feedback Control For Proximity Detection Systems

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