시험발사체용 지상고정장치 구동유압실린더의 운동특성에 관한 해석적 연구

Vehicle Holding Device(VHD) holds the launcher vehicle to the launch pad until 4 thrust engine make the same thrust force. In this study, the analytical study is performed about the dynamic characteristics of hydraulic cylinder applied to the vehicle holding device for Test Launch Vehicle(TLV). As a result, the contraction force is increased by decreasing the cylinder slit size. And the increased initial charging pressure makes the contraction force increased. According to the transient simulation result, the hydraulic cylinder starts to move when the cylinder contraction force exceeds the required contraction force. The cylinder contraction force is converged to the cylinder external force when the cylinder starts to move. Also, the pressure distribution in the hydraulic cylinder is constant.