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Study on Steering Ratio of Four-Row Rigid Tracked Vehicle on Extremely Cohesive Soft Soil Using Numerical Simulation

수치해석을 이용한 연약지반 4열 강체 무한궤도 차량의 최적 선회비 연구

Kim, Hyung-Woo;Lee, Chang-Ho;Hong, Sup;Choi, Jong-Su;Yeu, Tae-Kyeong;Min, Cheon-Hong
김형우;이창호;홍섭;최종수;여태경;민천홍

  • Received : 2013.09.16
  • Accepted : 2013.12.18
  • Published : 2013.12.31

Abstract

This paper considers the steering characteristics of a four-row tracked vehicle crawling on extremely cohesive soft soil, where each side is composed of two parallel tracks. The four-row tracked vehicle (FRTV) is assumed to be a rigid body with 6-DOF. A dynamic analysis program for the tracked vehicle is developed using the Newmark-${\beta}$ method based on an incremental-iterative scheme. A terra-mechanics model of an extremely cohesive soft soil is implemented in the form of the relationships of the normal pressure to the sinkage, the shear resistance to the shear displacement, and the dynamic sinkage to the shear displacement. In order to investigate the steering characteristics of the four-row tracked vehicle, a series of dynamic simulations is conducted with respect to the distance between the left and right tracks (pitch), steering ratios, driving velocity, reference track velocity, lengths of the tracks, and properties of the cohesive soft soil. Through these numerical simulations, the possibility of using a kinematic steering ratio is explored.

Keywords

Four-row tracked vehicle;Steering performance;Cohesive soft soil;Terra-mechanics;Dynamic simulation;Kinematic steering ratio

References

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Acknowledgement

Grant : 심해저 광물자원 통합채광시스템 개발연구

Supported by : 해양수산부