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이지호(Jiho Lee),강동명(Myengdong Kang),박종순(Jongsun Park),조이행(Yeehaing Cho),양동욱(Donguk Yang) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
This study conducted a performance study on life-saving ladder boom. The life-saving fire ladder truck is a 3.5 ton class vehicle that can be applied to a fire site where a large fire ladder truck is difficult to enter. Therefore, the reason for the difficulty in entering a fire truck is the development of a fire truck using a 3.5 ton vehicle. Considering the circumstances and alleys, it is the optimal vehicle size for Golden Time shooters. In this paper, the structural analysis of the ladder first stage boom was carried out to verify the stress and displacement prior to the construction of the small fire ladder. The sag measurement module was designed to perform the performance evaluation.
곽재련(Jaeryon Kwag),박경민(Kyungmin Park),백일현(Ilhyun Baek),조이행(Yeehaing Cho),정재연(Jaeyoun Jung) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Directional control valve is a main part of the hydraulic power steering system. It consists of a control spool, a housing and many hydraulic parts. The main roles of a directional control valve is link the working oil to the wanted direction . Flowed working oil through the directional control valve that operate the actuator to the specified direction so, it can makes steer the wheel&tire end of the drive shaft by using small force. Here, the structural characteristics and design parameters that directly affect to the dynamic behavior of the hydraulic system. The goal of this study was to understand the hydraulic fluid flow within directional control valve by using 3-D numerical method and wanted to know the pressure drop characteristics. To improve the convergence and robustness of the simulation model, a grid system was constructed with tetrahedron type grids all around the valve. Through this study we could know the CFD results relatively well matched with the experimental data.