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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

\( \left[a \cos \alpha, b \sin \frac{\beta }{2}\right] \)