A Low-Cost Wireless Multinode Vibration Monitoring System for Civil Structures

Figure 16

Power spectral density estimates from ambient vibration tests of the high-grade system and the developed system with various postprocessing interpolation strategies: (a) high-grade system; (b) low-cost system without interpolation; (c) low-cost system with spline interpolation; (d) low-cost system with NUFFT interpolation. The frequencies identified in [46] are marked in red vertical lines.

(a)

(b)

(c)

(d)