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노기태(Gi-Tae Roh),전도형(Do-Hyung Joen),최주형(Ju-Hyung Choi),조진래(Jin-Rae Cho) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Power steering hose is device that operation oil passes between steering gear box and oil pump by parts that is used to do steering system. Because this hose is receiving heat and pressure of high temperature, leakage can produce swaging from hitch of steel materials of done part. In this paper, we analyze swaging process of power steering hose by finite element analysis, and achieved thermal and pressure analysis with this shape. We can analogize weakness part of hose through this result, and examine closely oil leakage and rubber failure mechanism and look for important design benevolence of power steering hose development.
Assessment of casting parts fatigue life for 3MW offshore wind turbine
노기태(Roh, Gitae),강원형(Kang, Wonhyoung),이승찬(Lee, Seongchan) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
The purpose of this study is fatigue damage assessment for large sized casting parts (hub and mainframe) of the 3MW offshore wind turbine by computer simulation. Hub and mainframe durability assessment is necessary because wind turbine have to guarantee for 20 years. Fatigue life evaluation must be considered all of fatigue load conditions as the components are wind load transmission path. Palmgren-Miner linear damage accumulation hypothesis is applied for fatigue life estimation with stress-life approach. S-N curve for the spheroid graphite cast iron EN-GJS-400-18-LT is derived according to durability guidelines. Reduction factors were applied for survival probability, surface roughness, material quality and partial safety factor according to Germanischer Lloyd rules. To calculate fatigue damage, stress tensors, extracted from the unity load calculation from ANSYS is multiplied with time track of fatigue loads extracted from GH bladed. Damage accumulation is performed with all of fatigue load conditions at each finite element nodes. In this study maximum nodal damage value is under 1.0. casted parts are safe. This research was financially supported by the Ministry of Knowledge Economy(MKE), Korea Institute for Advancement of Technology(KIAT) and Honam Leading Industry Office through the Leading Industry Development for Economic Region.
스웨이징된 파워 스티어링 호스의 기계적 거동에 대한 유한요소 해석
노기태(Gi-Tae Roh),이영주(Young-Ju Lee),조진래(Jin-Rae Cho) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.10
Swaged power steering hose is receives mechanical load and heat from oil pump and enging in the engine room. In this paper, we perform the numerical analysis to evaluate the contact force, spring back and plastic deformation of power steering hose. For the sake of accuracy of analysis, we regard to nonlinearities such as material and geomerical nonlinerities and nonlinear contact of boundary condition. In order to investigate effectively mechanical behavior of power steering hose we use the finite element method
이영주(Young-Ju Lee),노기태(Gi-Tae Roh),조진래(Jin-Rae Cho) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.10
The power steering hose is used to connect the hydraulic pump to power steering gear. This hose experience very high temperature and pressure due to the oil flowing inside. Because of this reason, the hose may be broken of oil may leak from the hose. Therefore it is important to predict the behavior of the power steering hose accurately. For th available analysis of this problem, we model the power steering hose using finite element method effectively. Also, we study on the FE formulations for rubber-like materials and the nonlinear analysis schemes for large deformation problems.