The figure shows the magnification function of acceleration based on the power spectral density of the body acceleration and the power spectral density of excitation amplitude.
With the help of the relationships explained above, the influence of various roads (degree of unevenness φh(Ω0) and undulations w) on the spectral density of body acceleration can be discussed.
For example, a road with a very high proportion of short-wave excitations (low undulations w) would, on the basis of equation 1.4-17, result in a high density of the excitation acceleration in the range of high frequencies. This again would on the one hand accentuate the resonance peak in the range of the wheel natural frequency (fnW ~ 12 Hz) and on the other attentuate the resonance peak in the range of the body natural frequency (fnB ~ 1 Hz).