The multistage double acting oil pressure cylinder can overcome limits of a stroke of cylinder. Development target of the multistage double acting oil pressure cylinder makes a overcome operation distance, in the case of transport of bodies or tension, contraction working. It's structure is composed that fluid flow pipelines are inserted in the cylinder. In the serial arrangement of reciprocating cylinders, the multistage double acting oil pressure cylinder can prevent a buckling or cylinder loss because assemble arrangement is simple type of insertion way. Using the MSC.Visual Nastran, the 3D simulation was executed. Through the 3D simulation, we ascertained that the multistage double acting oil pressure cylinder could be adapted to a elevation system.

Abstract
 1. 서론
 2. 안테나형 다단 유압실린더
 3. 다단 복동 유압실린더
  3.1 다단 복동 유압실린더의 구성
  3.2 다단 복동 유압실린더의 모델링
  3.3 다단 복동 유압실린더 제작
 4. 시스템 시뮬레이션
  4.1 승강 시스템 시뮬레이션
  4.2 항복 예측 시뮬레이션
 5. 결론
 References

• 안영명(서일대학 자동차과 부교수) | Y. M. AHN
• 김도석(코리아엔지니어링 수석연구원) | D. S. KIM