An FRF measurement was completed to give the two degree of freedom response shown in Fig. P6.4 (a limited frequency range is displayed to aid in the peak picking activity).

Fig. P6.4 FRF measurement for two degree of freedom system.

(a) Use the peak picking approach to identify the modal mass, stiffness, and damping parameters for the two modes. Arrange your results in the \(2 \times 2\) modal matrices \(m_{q}, c_{q}\), and \(k_{q}\).
(b) The FRF "measurement" in part (a) was defined using the following MAtLAB \(^{\circledR}\) code.

Plot your modal fit together with the measured FRF and comment on their agreement.

Transcribed Image Text:

Imag(X/F) (m/N) Real(X/F) (m/N) -2 0 10-6 2 200 300 400 500 600 700 800 x 10-6 0 -2 T -3 200 300 400 500 600 700 800 Frequency (Hz)