THE PREDICTION OF SOIL STRENGTH ON BASIS OF CLIMATIC DATA AS CRITERIA OF OFF-ROAD MOBILITY

摘要

Terrain mobility of a vehicle on a given soil depends on the soil strength. The soil strength is influenced by the soil type and the soil conditions, which are the dry density and the moisture content. On natural soils the soil type and the soil density are nearly constant parameters for a defined area. In contrast to this the moisture content is not constant. The moisture content is decisive for the soil strength [1]. It is of importance in terrain vehicle evaluation, that the soil strength decreases with the increase of moisture content. Till now soil strength has to be measured every day and couldn't be calculated, because of the most unknown parameter - the weather. This paper, orginated at the Institute of Automotive Engineering IKK - Prof. Dr.-Ing. I. Schmid - in Hamburg, deals with calculation of the moisture content in future, based on the known moisture content today and the development of the climatic data. In a physical and a mathematical model the correlation of soil strength and moisture content will be described. Further on the change of moisture content as a result of the weather situation will be discussed, too. So the relation climatic data moisture content - soil strength - off-road mobility is developed, mathematically described and on different soil types verified.