Structural Health Monitoring Using Smart Sensors - ideals ...

6 10 14 18 22 26 30 34 38 42 46 50
3 7 11 15 19 23
31 35 39 43 47 51
27
2 5 9 13 17 21 25 29 33 37 41 45 49 53
1 4 8 12 16 20 24 28 32 36 40 44 48 52
Figure 8.2. Pin and roller ends.
Figure 8.3. Plastic fixture and the Imote2.
Figure 8.4. Ten Imote2s installed on nodes 2 to 11.
each of the threaded holes and tightened. The Imote2 is, thus, supported by the bottom of
the plastic fixture and the four set-screws.
Ten Imote2s are placed on the structure on the front panel of the truss creating three
overlapping local sensor communities. Because the number of available Imote2 sensors is
limited, sensors are moved on the structure, depending on which element is considered as
damaged. When damage in element 8 is considered, Imote2s are installed on nodes 2 to
11, with nodes 4, 6, and 8 becoming cluster heads that organize the local sensor
communities (see Figure 8.4). For example, node 4 organizes the local sensor community
consisting of nodes 2, 3, 4, 5, 6, and 7. When damage in element 20 is considered, Imote2s
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