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Table 1 Distribution characteristics of embedded sensor nodes

From: Embedded acoustic emission system based on rock sound source crowd location

Node Sample number x y Z μ Location
1 13 %M 0.3a + 0.7b 0.1a + 0.9b 0.3El [a cos α, b sin β]
2 13 %M 0.3a + 0.7b 0.1a + 0.9b 0.3El [a cos α, b sin β]
3 25 %M 0.4a + 0.6b 0.8a + 0.2b 0.38El \( \left[a \cos \frac{\alpha }{2},b \sin \beta \right] \)
4 13 %M 0.3a + 0.7b 0.1a + 0.9b 0.3El [a cos α, b sin β]
5 35 %M 0.6a + 0.4b 0.5a + 0.5b 0.6El \( \left[a \cos \alpha, b \sin \frac{\beta }{2}\right] \)