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: This paper is concerned with an experimental investigation about tractive performance of atracked vehicle on extremely soft soil. A tracked vehicle model with principal dimensions of 0.9 m(L) ×0.75 m(B) × 0.4 m(H) and the weight of 167 kg was constructed with a pair of driving chain links driven bytwo AC-servo motors. The tracks are configured with detachable grousers with variable span. Deep seabedwas simulated by means of bentonite-water mixture in a soil bin of 6.0 m(L) × 3.7 m(B) × 0.7 m(H). Slip ofvehicle and driving torque of motor were measured with respect to experimental variables; grouser span,grouser chevron angle, driving speed, drawbar-pull weight, position of center-of-gravity and weight. L 8 orthogonal array is adopted for DOE (Design Of Experiment). The effects of experiment variables ontraction performance are evaluated.Key words : (cohesive soil), (tracked vehicle), (orthogonal arrays), (Design Of Experiment), (grouser), (drawbar-pull test), (slip), (driving torque)

An Experimental Study about Tractive Performance of Tracked Vehicle on Deep-sea Soft Sediment Based on Design of Experiment Using Orthogonal Array