A Multimode Approach to Geometrically Nonlinear Free and Forced Vibrations of Multistepped Beams

Table 3

The linear and nonlinear frequency ratio and the contribution coefficients of stepped beam (b) subjected to a forced vibration.

Wmax		a1
0.096	0.299	0.0517	3.986E−18	5.258E−04	3.117E−19	4.381E−05	2.534E−19	1.175E−05	1.781E−18	4.455E−06	2.281E−18
0.748	1.099	0.3998	1.049E−15	3.6292E−3	−1.027E−16	−3.855E−04	4.186E−17	−5.581E−05	−7.892E−17	−1.487E−05	4.443E−17
1.13	1.3	0.6131	3.271E−15	1.092E−2	−3.642e−16	−1.479E−3	1.369E−16	−2.332E−04	−2.810E−16	−6.657E−05	1.459E−16