The results of the analysis of the vibration energy from impact loads varying in time using the dissipation model. On the basis of the solutions resulting from the model of the second order differential equation with variable driving function analysis was performed at the time of the FFT function of the displacement of dissipation points by the adopted and specified matrix values of the masses, elasticity and damping. Spectral analysis is based on the compounds resulting from the vibration energy proportionality, as a momentary power surge force, to the sum of the product of the squares of the displacement and squares of the vibration frequency.