An Improved Fourier Series Method for the Free Vibration Analysis of the Three-Dimensional Coupled Beams

Figure 3

The modes of coupled beams with C-C: (a) the first mode, (b) the second mode, (c) the third mode, (d) the fourth mode, (e) first rotational vibration, (f) second rotational vibration.

(a)

(b)

(c)

(d)

(e)

(f)