KCEV(Korean Combat Engineer Vehicle) perform the mission of removing mines and various military obstacles buried in the battlefield and opening passageways. It is characterized by modifying the chassis of the K1 series tank and equipping it with an excavator, track-width mine plough, and magnetic signature duplicator. KCEV has a steering wheel, and steering force is transmitted to the transmission steering lever through the steering linkage and acceleration linkage. KCEV can be steered in up to 3 gears, and it was confirmed that there was a risk of interference with the acceleration linkage as a bending occurred in the steering linkage when steering to the right in 3 gears. In this study, we examined the bending of the acceleration linkage and proposed a method to increase the stiffness of the acceleration linkage tube to improve it. Structural analysis was conducted to confirm the effect of increasing rigidity, and the improvement was confirmed by applying it to an actual vehicle. As a result, it was confirmed that not only the bending displacement of the steering linkage was reduced, but also the stress in the bent area was reduced.

본 연구에서는 탄소나노튜브/화이버/폴리머 복합소재 구조에 대한 재료 물성 및 강성 추정을 다룬다. 수정된 Halpin-Tsai 모델을 적용한 멀티 스케일 해석은 탄소나노튜브의 함유량 비율, CNT 두께-길이 비율, 화이버 부피 함유량, 그리고 화이버 보강각도 변화에 따라서 수행되었다. 본 연구에서 제시한 멀티-스케일 접근방법은 기존 모델을 적용하여 얻은 결과와 비교하여 검증하였다. 매개변수 해석을 통하여 CNT의 적절한 함유량은 적층된 CNTFPC 구조의 구조성능의 향상시킬 수 있는 중요한 특성을 규명하였다.

The acrylic tube, referred to as geocell in this paper, is 2.19m long with an inner diameter of 280mm. Both ends of the acrylic tube were covered with permeable geotextile sheets to allow water dissipation. The dredged soil fill material is hydraulically filled into the acrylic tube in the form of soil-water mixture (slurry). Load cells oriented in the vertical and horizontal directions were installed inside the geocell to measure the horizontal and vertical pressures inside the cylindrical tube. The pressure readings are collected through a data logger and interpreted by a desktop computer. The pressure distribution inside the geocell based on the load cell readings are closely related to the theoretical Ko and Ka conditions.