RTM 제작 공법을 적용한 친환경 섬유 복합재료 구조의 기계적 특성 분석 및 탱크 설계

박현범,공창덕,박광림,이호연,김종훈 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11

본 연구에서 아마/비닐에스테르(Flax/vinyl ester)를 적용한 친환경 구조물 설계를 위한 선행 연구로서 아마/비닐에스테르 자연 섬유 복합재료의 기계적 물성치를 분석하였다. 시편 제작을 위해 VARTM 제작 공법이 적용되었다. 참고문헌에서 제시한 자연 섬유 복합재료의 물성치와 본 연구에서 제작된 시편의 물성치를 비교하였다. 이 결과를 바탕으로 아마/비닐 에스테르 복합재료가 경량화 구조물에 적용하는 것이 유리함을 확인하였다. 물성치 평가결과를 활용하여 차량용 탑재 농약 탱크의 구조 설계 및 해석을 수행하였다. In this study, an investigation on mechanical properties of flax/vinyl ester natural fiber composite was performed as a precedent study on the design of eco-friendly structure using flax/vinyl ester composite. Vacuum Assisted Resin Transfer Molding(VARTM) manufacturing method was adopted for manufacturing the flax fiber composite specimen. The mechanical properties of the manufactured flax composites were compared with flax composite data cited from some references. Based on this, the experimental data showed that the flax/vinyl ester composite has some advantages when it is applied to lightweight structure. Structural design and analysis of agricultural vehicle chemical tank was performed using mechanical properties.

수직축 풍력 블레이드의 복합재 적용 설계, 제작 및 시험 평가 연구

박현범 항공우주시스템공학회 2018 항공우주시스템공학회지 Vol.12 No.3

본 연구는 수직축 풍력 발전 시스템의 복합재 블레이드에 대한 설계 및 제작 연구이다. 본 연구에서수직축 풍력 발전용 복합재 블레이드의 공력 및 구조 설계를 수행하였다. 1차적으로 복합재 블레이드의공력 및 구조 설계 요구 조건이 분석되었다. 구조 설계 이후 유한 요소 해석 기법을 활용하여 풍력 블레이드 구조의 구조 해석이 수행되었다. 적용 하중 조건에서 응력 및 변위 해석이 수행되었다. 단계적구조 해석을 통해 취약 부위의 개선 설계 방안을 제시하였다. 구조 해석을 통해 최종 설계된 블레이드구조는 안전한 것으로 확인되었다. This work dealt with the design and manufacturing of composite blades of a vertical axis wind turbine system. In this work, aerodynamic and structural designs of sandwich composite blades for a vertical axis wind turbine system were performed. First, the aerodynamic and structural design requirements of the composite blades were investigated. After the structural design was complete, a structural analysis of the wind turbine blades was performed using the finite element analysis method. It was performed with the stress and displacement analysis at the applied load condition. A design modification for the structurally weak part was proposed as a result of the structural analysis. Through another structural analysis, it was confirmed that the final designed blade structure is safe.

Drug Fever Due to Piperacillin/Tazobactam Loaded into Bone Cement

박현범,최준석,박상훈,기원주,고영일 대한의학회 2011 Journal of Korean medical science Vol.26 No.2

Although drug fever may develop after administration of the drug by various routes, it has not been reported with antibiotic-loaded bone cement. Here, a case of drug fever induced by piperacillin/tazobactam loaded into bone cement is reported. A 72-yr-old woman presented with fever that developed two weeks after insertion of bone cement loaded with antibiotics including piperacillin/tazobactam into the knee joint for infectious arthritis. The fever was associated with a skin rash and blood eosinophilia. The work-up of the fever excluded several causes. Drug provocation test demonstrated that the piperacillin/tazobactam, which had been loaded in the bone cement, was the cause of the fever. The findings of this case suggest that drug fever can be induced by any drug placed and released continuously within the body. Therefore, the evaluation for possible drug fever should include all drugs the patient has been exposed to regardless of the route of administration.

샌드위치 복합재 바닥 구조물의 구조 설계 및 해석

박현범 항공우주시스템공학회 2017 항공우주시스템공학회지 Vol.11 No.6

This work dealt with structural safety analysis about sandwich composite structure of automotive floor board. In this work, structural design and analysis of sandwich composite structure for automobile floor board were performed. Firstly, structural design requirement of automobile floor board was investigated. After structural design, the structural analysis of the automobile floor board were performed by the finite element analysis method. It was performed that the stress and displacement analysis at the applied load condition. After structural test of target structure, structural test results were compared with analysis results. Through the structural analysis, it was confirmed that the designed floor board structure is safety. 본 연구는 자동차 바닥 구조로 적용된 샌드위치 복합재 구조의 안전성 해석에 관한 연구이다. 본 연구에서 샌드위치 복합재 구조 적용 자동차 바닥의 구조 설계 및 해석을 수행하였다. 1차적으로 자동차바닥 구조의 구조 설계 요구 조건이 분석되었다. 구조 설계 이후 유한 요소 해석 기법을 활용하여 자동차 바닥 구조의 구조 해석이 수행되었다. 적용 하중 조건에서 응력 및 변위 해석이 수행되었다. 최종바닥 구조의 구조 시험을 수행한 후 해석 결과와 비교하였다. 구조 해석을 통해 설계된 샌드위치 복합재 바닥 구조는 안전한 것으로 확인되었다.

Coexistence of Solitary Rectal Ulcer Syndrome and Ulcerative Colitis: A Case Report and Literature Review

박현범,박형철,정조윤,김정일,명대성,조성범,이완식,주영은 대한장연구학회 2014 Intestinal Research Vol.12 No.1

Solitary rectal ulcer syndrome (SRUS) is an uncommon benign disease that is misdiagnosed as malignancy or inflammatory bowel disease because of similarities in clinical and endoscopic manifestations. Furthermore, SRUS with ulcerative colitis (UC) is extremely rare. To date, two cases have been reported in the medical literature. We report an additional case of SRUS with UC that was misdiagnosed as rectal cancer. A 61-year-old man was admitted to our hospital with rectal bleeding. Colonoscopy showed a well-demarcated, shallow, ulcerative lesion with polypoidal growth involving the entire circumference of the rectal lumen. Findings from imaging studies, including abdominal computed tomography (CT) and positron emission tomography (PET)/CT resembled those of rectal cancer. Surgical resection was performed because clinical symptoms persisted despite medical treatment and because occult rectal cancer could not be ruled out. Histopathological examination of the resected specimen revealed fibromuscular obliteration of the lamina propria and crypt abscesses, characteristics compatible with SRUS and UC.

VARTM 공법으로 제작된 자연섬유 복합재료의 기계적 특성 분석

박현범,Park, Hyunbum 항공우주시스템공학회 2016 항공우주시스템공학회지 Vol.10 No.3

In this study, an investigation was performed on the mechanical properties of the natural-fiber-composite structure. The specimen was manufactured using the Vacuum Assisted Resin Transfer Molding (VARTM) method. The flax-fiber materials were adopted for the natural fiber composite, and vinyl-ester resin was also adopted. After a manufactured specimen was obtained, a mechanical test was carried out. The mechanical properties of the experiment results were compared with those of the natural-composite data cited from a number of other references.

자연섬유복합재를 이용한 1㎾급 수평축 풍력 터빈 블레이드의 구조 설계 연구

박현범,공창덕,박길수,J. Lee 한국항공우주학회 2012 한국항공우주학회 학술발표회 논문집 Vol.2012 No.11

본 연구에서 자연 섬유를 적용한 1㎾급 수평축 풍력 터빈 블레이드의 구조 설계 연구를 수행하였다. 기존의 유리섬유/에폭시 재질 적용 블레이드와 아마/에폭시 재질 적용 블레이드의 구조 설계 결과를 비교하였다. 블레이드의 구조 설계는 단순 설계 및 혼합 설계 기법를 적용하여 설계를 수행하였다. 설계된 블레이드의 구조적 안전성은 상용 유한요소프로그램인 MSC. NASTRAN을 사용하여 다양한 하중에 따라 선형 정적해석, 변형해석, 좌굴해석을 수행하였다. In this work, a structural design on 1㎾ class horizontal axis wind turbine blade using natural-fibre composite is performed. The structural design result of flax/epoxy composite blade is compared with the result of glass/epoxy composite blade. The structural design of the wind turbine blade is carried out using the simplified methods such as the netting rule and the rule of mixture. The structural safety of the designed blade structure is investigated through the various load cases, stress, deformation and buckling analyses using the commercial FEM code, MSC. NASTRAN.

RTM 제작 공법을 적용한 친환경 섬유 복합재료 탱크의 설계 및 제작

박현범,공창덕,박광림,이호연,김인권 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.4

본 연구에서 아마/비닐에스테르(Flax/vinyl ester)를 적용한 친환경 구조물 설계를 위한 선행 연구로서 아마/비닐에스테르 자연 섬유 복합재료의 기계적 물성치를 분석하였다. 시편 제작을 위해 VARTM 제작 공법이 적용되었다. 참고문헌에서 제시한 자연 섬유 복합재료의 물성치와 본 연구에서 제작된 시편의 물성치를 비교하였다. 이 결과를 바탕으로 아마/비닐 에스테르 복합재료가 경량화 구조물에 적용하는 것이 유리함을 확인하였다. 물성치 평가결과를 활용하여 차량용 탑재 농약 탱크의 구조 설계 및 해석을 수행하였다. 최종 VARM 제작 공법을 적용하여 시제품 탱크를 제작하였다. In this study, an investigation on mechanical properties of flax/vinyl ester natural fiber composite was performed as a precedent study on the design of eco-friendly structure using flax/vinyl ester composite. Vacuum Assisted Resin Transfer Molding(VARTM) manufacturing method was adopted for manufacturing the flax fiber composite specimen. The mechanical properties of the manufactured flax composites were compared with flax composite data cited from some references. Based on this, the experimental data showed that the flax/vinyl ester composite has some advantages when it is applied to lightweight structure. Structural design and analysis of agricultural vehicle chemical tank was performed using mechanical properties. Finally, prototype tank was manufactured using VARTM manufacturing method.

수직축 풍력 발전 시스템의 유리/에폭시 복합재 블레이드 및 타워 구조 설계 연구

박현범 한국복합재료학회 2018 Composites research Vol.31 No.3

This study is to propose the structural design and analysis procedure about composite blade and tower of vertical axis wind turbine technology. In this study, structural design of tower for vertical axis wind turbine was performed after vertical blade design and manufacturing. The structural design requirement and specification of blade and tower was investigated. After tower of structural design, the structural analysis of the tower was conducted by the finite element method. It was performed that the stress, deformation and natural frequency analysis at the applied loading. The design modification of tower configuration was proposed by structural analysis. It was confirmed that the final designed tower structure is safety through the structural analysis. 본 연구에서 수직축 풍력 발전기의 복합재 블레이드 및 타워에 대한 구조 설계 및 해석 방안을 제시하였다. 본 연구에서 수직축 블레이드의 설계 및 제작 수행 후 풍력 발전기 타워의 구조 설계를 수행하였다. 먼저 블레이드와 타워의 설계 요구 조건 및 사양이 정립되었다. 타워 구조 설계 이후 유한 요소 해석을 통하여 타워의 구조 해석을 수행하였다. 적용된 하중에서 응력, 변형, 고유 진동수 해석이 수행되었다. 구조 해석을 통해 타워 형상의 개선 설계 방안을 제시하였다. 최종 설계된 타워 구조는 구조 해석을 통해 안전한 것으로 확인되었다.

항공기 기체에 적용된 샌드위치 복합재 구조의 손상 후 수리 방안 연구

박현범,공창덕,Park, Hyunbum,Kong, Changduk 항공우주시스템공학회 2013 항공우주시스템공학회지 Vol.7 No.1

In this study, damage assesment and repair technique of aircraft adopted on Sandwich composite structure were performed. The sandwich composite structure were damaged by drop weight type impact test machine. The damaged sandwich composite structure was repaired using external patch repair method after removing damaged area. This study presents comparison results of the experimental investigation between the impact damaged and the repaired specimen.