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양형 튜블러 샤프트 요크 적용 가변 슬라이딩 중간축 모듈의 토크 변경에 따른 응력 분포 특성
염진섭,서현규 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.6
The objective of this study is to investigate the effect of torque variation on stress distributions in A-IMS module with both side tubular shaft yoke by numerically. In order to achieve this, the torque value was increased from 10Nm to 40Nm, and the results of this work were confirmed in terms of Von-mises Stress and the displacement characteristics. As the torque in module assembly was increased, the stress in tubular shaft york and splined shaft york was increased linearly. The indentation due to the steel ball was occurred in over 40N·m torque which is over the yield strength condition. The largest displacement occurred in the tubular shaft yoke 1, however, it does not exceed the yield strength and is supposed to be restored due to the elasticity. Therefore, it was concluded that there is no problem for the manufacturing of A-IMS with both side tubular shaft yoke.
샤프트 홀의 길이에 따른 A-IMS 튜블러 샤프트의 가공특성
염진섭,서현규 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.1
The objective of this study is to investigate the effect of tubular shaft hole length on the A-IMS production process in numerically. The hole length of tubular shaft was changed from 69.5mm to 79.5mm for distribution of load and stress. Then, the tubular shaft was modeled by S20C which was referred to program library. At the same time, the results of numerical analysis were compared in terms of under-fill, metal flow, principal stress, Von-mises stress and load characteristics. In the results, the load and stress were increased at 4 stage when the hole length of tubular shaft was increased. Also, folding phenomenon was observed to intensify as increasing the hole length of tubular shaft by confirmation of metal flow.
천장관절 나사 고정술을 위한 컴퓨터 지원 수술 장치의 개발
염진섭,최원식,김하용,김환정,강종원,김영호,김형민,서동현,이석,이제범,김남국,김철영 대한골절학회 2003 대한골절학회지 Vol.16 No.1
목 적 : 천장관철의 경피적 나사 고정술을 위한 컴퓨터 지원 수술 장치를 개발하여, 그 정확도를 측정하여 보고자 하였다. 대상 및 방법 : 광학 추적 장치(Polaris, Northern Digital, Canada)와 개인용 컴퓨터를 이용한 항법 장치를 개발하였다. 정확도 측정용 팬텀을 제작하여 복합 정합시의 정합 오차와 표적 지시 오차를 각각 30회씩 측정하였으며, 4개의 플라스틱 골반골 모델(Sawbone, USA)에 16개의 6.5 ㎜유관 나사를 삽입하여 정확히 삽입되었는지 여부를 호가인하였다. 결 과 : 정합 오차는 0.76±0.33㎜, 표적 지시 오차는 1.43±0.42㎜였다. 골반골 모델에 삽입한 16개의 나사는 모두 천장관절내에 삽입되었고, 피질골을 뚫고 나오거나 인접한 두 개의 나사나 와셔가 서로 충돌한 경우는 없었다. 결 론 : 개발된 컴퓨터 지원 수술 장치는 해외에서 개발된 장치와 유사한 정확도를 가지고 있었고, 골반골 모델을 이용한 모의 수술에서도 만족할 만한 결과를 얻었다. Purpose : The purpose of this study were to develop a computer-assisted surgery system for percutaneous screw fixation of the sacro-iliac joint and to evaluate its accuracy. Materials and Methods : We have developed a navigation system composed of an optical tracking device(Polaris, Northern Digital, Canada) and a personal computer. The registration error and target localization error at hybrid registration were measured using a phantom. The errors were measured 30 times for each. Sixteen 6.5㎜ cannulated screws were inserted into four plastic bone models (Sawbones, USA), and the accuracy was evaluated. Results : The registration error was 0.76±0.33 ㎜, and the target localization error was 1.43±0.42 ㎜. All of the 16 screws were inserted well across the sacro-iliac joint, and there was neither penetration of the cortical bones nor collision between screws or washers. Conclusion : The accuracy of the developed system was similar to existing ones, and its usefulness and helpfulness was proven with screw insertion into plastic bone models.
염진섭,김호중,전흥재,강경탁,이환모,장봉순,이춘기 연세대학교의과대학 2015 Yonsei medical journal Vol.56 No.1
Purpose: The purpose of this study was to evaluate and compare the biomechanicalbehavior of the lumbar spine after posterior decompression with the spinous process osteotomy (SPiO) technique or the conventional laminectomy (CL) techniqueusing a finite element (FE) model. Materials and Methods: Three validated lumbar FE models (L2‒5) which represented intact spine and two decompression models using SPiO and CL techniques at the L3‒4 segment were developed. In each model, the ranges of motion, the maximal von Mises stress of the annulus fibrosus,and the intradiscal pressures at the index segment (L3‒4) and adjacent segments(L2‒3 and L4‒5) under 7.5 Nm moments were analyzed. Facet contact forces were also compared among three models under the extension and torsion moments. Results: Compared to the intact model, the CL and SPiO models had increased range of motion and annulus stress at both the index segment (L3‒4) and the adjacent segments under flexion and torsion. However, the SPiO model demonstrateda reduced range of motion and annulus stress than the CL model. Both CL and SPiO models had an increase of facet contact force at the L3‒4 segment under the torsion moment compared to that of the intact model. Under the extensionmoment, however, three models demonstrated a similar facet contact force even at the L3‒4 model. Conclusion: Both decompression methods lead to postoperativesegmental instability compared to the intact model. However, SPiO techniqueleads to better segmental stability compared to the CL technique.