Characterizing the Dynamic Response of a Chassis Frame in a Heavy-Duty Dump Vehicle Based on an Improved Stochastic System Identification

Table 2

Comparison of modal parameters between standard hammer test and random hammer test.

Modal number	1	2	3	4	5	6	7	8	9	10	11	12
Frequency (Hz)	0.46	0.21	1.75	1.06	0.69	0.81	0.90	0.84	0.25	0.74	0.68	0.66
Damping ratio (%)	−0.50	−0.76	−0.33	0.02	−0.68	0.03	−1.04	0.39	−0.11	−0.27	0.11	−0.37
MAC	0.01	0.01	0.17	0.01	0.02	0.10	0.21	0.15	0.11	0.20	0.02	0.06