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Abstract
The simplest form of the power spectral density for characterising longitudinal road unevenness is as a line on a log–log chart. The influence of waviness (the slope of the line) on the vibration response variance of selected quantities of the travelling vehicle was investigated using simulations of various vehicle types. For expressing the response variance, besides the unevenness index and the travel speed raised to the power containing the longitudinal road waviness (v w−1), the integrated frequency response must also be taken into account. The latter is dependent on the road waviness, but this last component may be expressed as a product of two factors. One is dependent on the vehicle structure and the quantity to be measured, whereas the other is dependent on the waviness only. This separation simplifies the study of the effect of waviness on various aspects of the vehicle dynamics. Finally, a simplified method for estimating the unevenness index and waviness without knowing the longitudinal road profile is described.
Acknowledgements
This work has been undertaken within Grant No. 2/6161/26 of the Slovak Academy of Sciences Grant Agency VEGA. The support of the agency is gratefully acknowledged.