In the numerical study, accurate frequency parameters and mode shapes of the plates are calculated for the first several modes, and the effects of the orthotropy are discussed.
The proposed method produces excellent predictions of the first several modes of the fixed-base structure, so long as modal truncation is minimized.
And for this several modes are possible.
The model is used to study the resonant frequencies and damping ratios of the lowest several modes of beams with various boundary conditions and inertia and stiffness properties as the shear stiffnesses of the viscoelastic layers are varied.
All of the obtained results demonstrate that the proposed method precisely identifies damages by using only the first several modes' data, even when incomplete noisy modal data are considered as input data.
The results show that the first three modes accounts for 52.5% of total fluctuation, the first five modes account for 63.8%, and the first ten modes account for 74.8%, indicating that the major motions of EcDHNA can be described by the first several modes of fluctuation.
In the E simulation, the largest fluctuations occur in loop1 and loop2 at the active site, and this is largely captured in the highest-amplitude quasi-harmonic mode, although it also persists in the next several modes (Supplementary Figure S4A).
In the case of several modes, the closest to the median was preferred.
Furthermore, influences of permanent magnets on resonance peaks for the first several modes under different physical and geometrical properties are evaluated.
