问题描述：
英语翻译
In general,road roughness is the main source of dynamic excitation in road dynamics.In site-specific problems the actual road profile can be measured and employed in the calculations.When the actual profile of a particular road stretch is not appropriate but a set of profiles that are representative of a certain sort of roads,stochastic definitions for the generation of synthetic profiles are used (e.g.[1,8,12]).It is a commonly assumed hypothesis that the randomness of the road surface roughness can be represented with a normal stationary ergodic random process described by means of its Power Spectral Density (PSD)
机翻可以,但不修改通顺的话不予采纳.
In general,road roughness is the main source of dynamic excitation in road dynamics.In site-specific problems the actual road profile can be measured and employed in the calculations.When the actual profile of a particular road stretch is not appropriate but a set of profiles that are representative of a certain sort of roads,stochastic definitions for the generation of synthetic profiles are used (e.g.[1,8,12]).It is a commonly assumed hypothesis that the randomness of the road surface roughness can be represented with a normal stationary ergodic random process described by means of its Power Spectral Density (PSD)
机翻可以,但不修改通顺的话不予采纳.
问题解答：
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