| Summary: | Previous researches into the problem of road corrugations were mainly concerned with the production of corrugations in loose dry materials by follower wheels but the present work deals with the development of corrugations in wet sand by a driven wheel-load system. The object was to find, if possible, the conditions most favourable to the formation of corrugations, to deduce from that the relationship between the natural properties of the material forming the track, the mechanical characteristics of the wheel-load system and the dimensions of the corrugations formed, and to compare the results of the present work with those produced by a follower wheel. Existing analysis of the vibration of such a wheel-load system dealt mainly with tho primary vibration. In the present research, the vibrating system was simulated on an analogue computer and the results showed that, in this particular case, the secondnary vibration was very important. In fact, the secondary vibration could have a disruptive effect on the regularity of the corrugations. Those computer results were confirmed both by theory and the test results. From all these; it emerged that where the effect of the secondary vibration is not sufficiently appreoiable as to render the resultant motion of the vehiole vmeel seriously irregular, then the mechanical properties of the system bear a close relationship with the dimensions of the corrugations formed irrespective of the material.
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