On trafficability of tracked oversnow vehicle
Energy analysis for track motion on snow covered terrain
1980 Volume 42 Issue 2 Pages 93-100
Details
1980 Volume 42 Issue 2 Pages 93-100
As in snow trafficability the first pass is the worst pass, the study on vehicle-snow interaction problem should be started on the basis of technology for vehicle mobility but from evaluating some of the various characteristics of compressibility and shear in snow with reference to the requirements for prediction of trafficability. After presenting energy equilibrium equation for track motion on snow covered terrain, the relation between tractive force of over snow vehicle T4 per one traok and slip ratio s has been given as follows;
T4=1/1-ST1-S/1-S (T3+T6) - (T2+T5)
Here, T1 is traction force of track belt driven by sprocket, T2 is compaction resistance, T3 is tractive resistance of snow terrain, T5 is side friction resistance between mounted snow and natural snow terrain and T6 is side friction resistance between compacted snow among shoe grousers and natural snow terrain.
T1 is determined to be effective traction force of track belt from engine power, and T2 and the sinkage of vehicular footing is calculated from rectangular plate loading test on snow from finite shallow snow depth to infinite snow depth. T3, T5 and T6 are calculated from vane cone test on snow, and the tractive resistance of snow terrain T3 can be calculated from the maximum shearing strength for compacted pressure of maximum contact pressure which is approximately equal to 4 times average contact pressure of tractor.
