An Experimental Test Bed for Developing High-Rate Structural Health Monitoring Methods

Table 1

Finite element and experimental natural frequencies for the DROPBEAR with no added mass ( = 0 kg), adding the electromagnet near the beam tip ( = 0.259 kg), and with the electromagnet and added mass plates ( = 0.695 kg). Percent errors are relative to the experimentally obtained natural frequencies.

Added Mass ()	Mode	Experimental	Finite Element
		Natural Frequency [Hz]	Natural Frequency [Hz]	Error
0 kg	1	19.6	19.8
	2	124.5	123.8
	3	350.0	346.8
0.259 kg	1	15.3	15.2
	2	106.9	106.6
	3	311.8	307.2
0.695 kg	1	11.6	11.6
	2	91.5	90.6
	3	240.8	233.3