Identification of a Duffing Oscillator under Different Types of Excitation

Table 5

Identification results (noise 5%): percentage error $(100·|\text{estimated–actual}|$/actual).

$i$	$m$	$k$	$c$	$k_3$
60	1.19	3.08	0.53	6.24
90	1.60	2.62	0.15	5.29
120	1.41	1.84	0.73	3.82
180	1.26	1.61	1.59	3.34