Surface wave and body wave can also be implemented by normal modes summation.

The mode superposition method is used in the dynamic calculation.

In this paper, the internal forces in the composite space grids were calculated by using the mode superposition response spectrum method and the pattern of the internal forces in those structures under vertical earthquake, the problem of truncated modes and the feature about the distribution of the vertical seismic force coefficient were studied.

The proposed approach can offer an exact solution for dynamic response of base-isolated structure by means of the mode superposition method in each elastic and plastic phase, between which the transitional time must be obtained and employed.

This paper analyzes the forced vibration response of transmission system in 200km/h AC electric locomotive during its starting period, establishes the calculating model of the driving system by using mode superposition method, calculates the forced torsional vibration response of transmission system and the dynamic load magnification factor; and analyzes the influence of excitation functi.

Therefore the vibration equation of the non-proportional damping of the isolated system is decoupled,and the responses of structure under earthquake excitation can be solved by the mode superposition method.

Also,a method that combines the Fourier transform and mode superposition to solve the vibration equations is presented.