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이상협(Sang-Hyeop Lee),양동호(Dong-Ho Yang),차승환(Seung-Whan Cha),곽진(Jin Kwak),이종찬(Jong-Chan Lee),이영식(Young-Sik Lee) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.8
This study is to evaluate the structural stability of heavy duty structure of the Complex CNC automatic lathe. The analysis conditions were analyzed by applying the weight and load of the part itself and then applying the weight of the upper assembly unit. As a result of the structural analysis, the values of stress and strain are small and safety factor is high, and as a result of the dynamic analysis, there will be no resonance outside the equipment driving area, so there will be no problem in equipment stability.
송권욱,차승환,정일섭 嶺南大學校 工業技術硏究所 2002 工業技術硏究所論文集 Vol.30 No.2
Simplified modeling technique was applied to generate finite element models for lumbar spine and instrumented pedicle screw systems. Three consecutive vertebrae were included in a model, and two level instrumentaion was analyzed. In these simplified models, spring elements and multi-point constraints were used to represent the stiffness of functional spine units. Instrumented screws were modeled by using beam elements constrained to adjacent cancellous bone nodes. External loads on lumbar were estimated from intact models, based on the experimentally noted normal range of motion for flexion, extension, lateral bending and torsion. Compression load was determined by overload assumption based on the weight of human body. These estimated loads were regarded as external loads and applied to instrumented models, and section loads in implanted pedicle screw system were computed. The conditions, magnitudes and locations of critical section loads were sought for and summarized. From the computed internal loads, critical load cases were identified. The effective stresses for the critical cases were evaluated and found to be well below the static strength of titanium alloy.