Probabilistic Assessment of Damage from Same Shock Response Spectra due to Variations in Damping

Table 4

Comparison of actual decay rates with those computed from FFT.

	Frequencies
	100 Hz	200 Hz	400 Hz	650 Hz	950 Hz
Trial 1 actual	0.07500	0.03750	0.01875	0.01154	0.00750
Trial 1 from FFT	0.07499	0.03750	0.01875	0.01154	0.00750
Trial 2 actual	0.075	0.0375	0.01875	0.03462	0.0225
Trial 2 from FFT	0.0756	0.0376	0.0188	0.0346	0.0222
Trial 3 actual	0.075	0.0375	0.01875	0.04616	0.03
Trial 3 from FFT	0.0757	0.0377	0.0189	0.0496	0.0280
Trial 4 actual	0.15	0.075	0.01875	0.01154	0.0075
Trial 4 from FFT	0.1433	0.0741	0.0188	0.0115	0.0075