DURABILITY IMPROVEMENT OF AUTOMOTIVE V-BELT PULLEY

김범근,김용수,안성훈,장재덕,D. M. CHUN 한국자동차공학회 2009 International journal of automotive technology Vol.10 No.1

Improving the durability of an automotive V-belt pulley, which is commonly used in an automotive powertrain to transfer power to other parts, is discussed. Fatigue life of the original V-belt pulley is predicted based on damage analysis by finite element analysis (FEA). Stress history of the pulley during operation was found by performing consecutive static analyses on the pulley as the pulley rotates. Assembly load (due to the tightening of the bolts) and operation load were considered to describe the actual load conditions in a durability test. The contact condition from the belt was calculated and applied to the surface of the pulley. Static analyses at 36 different positions of the pulley, every ten degrees of rotation, were performed to determine the stress history of the pulley during operation. Using stress history data calculated from FE analysis, damage over one rotation of the pulley was calculated and fatigue life, in number of rotations to failure, was estimated. An improvement to the durability of the pulley was investigated by modifying the design of the pulley using FE analysis results. Durability tests for the pulleys used in the analysis were carried out to verify the analytical results. Comparison between analysis and experimental results showed that analytical results correlated with the experimental results closely. Improving the durability of an automotive V-belt pulley, which is commonly used in an automotive powertrain to transfer power to other parts, is discussed. Fatigue life of the original V-belt pulley is predicted based on damage analysis by finite element analysis (FEA). Stress history of the pulley during operation was found by performing consecutive static analyses on the pulley as the pulley rotates. Assembly load (due to the tightening of the bolts) and operation load were considered to describe the actual load conditions in a durability test. The contact condition from the belt was calculated and applied to the surface of the pulley. Static analyses at 36 different positions of the pulley, every ten degrees of rotation, were performed to determine the stress history of the pulley during operation. Using stress history data calculated from FE analysis, damage over one rotation of the pulley was calculated and fatigue life, in number of rotations to failure, was estimated. An improvement to the durability of the pulley was investigated by modifying the design of the pulley using FE analysis results. Durability tests for the pulleys used in the analysis were carried out to verify the analytical results. Comparison between analysis and experimental results showed that analytical results correlated with the experimental results closely.

부유식 해상풍력발전기용 반잠수식 계류 풀리의 강도 성능평가를 위한 구조해석과 축소 모형시험

송창용 해양환경안전학회 2023 해양환경안전학회지 Vol.29 No.5

Recently, the destructive power of typhoons is continuously increasing owing to global warming. In a situation where the installation of floating wind turbines is increasing worldwide, concerns about the huge loss and collapse of floating offshore wind turbines owing to strong typhoons are deepening. A new type of disconnectable mooring system must be developed for the safe operation of floating offshore wind turbines. A new submersible mooring pulley considered in this study is devised to more easily attach or detach the floating offshore wind turbine with mooring lines compared with other disconnectable mooring apparatuses. To investigate the structural safety of the initial design of submersible mooring pulley that can be applied to an 8MW-class floating type offshore wind turbine, scale-down structural models were developed using a 3-D printer and structural tests were performed on the models. For the structural tests of the scale-down models, tensile specimens of acrylonitrile butadiene styrene material that was used in the 3-D printing were prepared, and the material properties were evaluated by conducting the tensile tests. The finite element analysis (FEA) of submersible mooring pulley was performed by applying the material properties obtained from the tensile tests and the same load and boundary conditions as in the scale-down model structural tests. Through the FEA, the structural weak parts on the submersible mooring pulley were reviewed. The structural model tests were conducted considering the main load conditions of submersible mooring pulley, and the FEA and test results were compared for the locations that exceeded the maximum tensile stress of the material. The results of the FEA and structural model tests indicated that the connection structure of the body and the wheel was weak in operating conditions and that of the body and the chain stopper was weak in mooring conditions. The results of this study enabled to experimentally verify the structural safety of the initial design of submersible mooring pulley. The study results can be usefully used to improve the structural strength of submersible mooring pulley in a detailed design stage. 최근 지구 온난화의 영향으로 태풍의 파괴력이 증가함에 따라 부유식 해상풍력발전기의 막대한 유실과 붕괴에 대한 우려가 깊어지고 있다. 부유식 해상풍력발전기의 안전한 운영을 위해 새로운 형태의 탈착형 계류 시스템 개발이 요구되고 있다. 본 연구에서 고려한 새로운 반잠수식 계류 풀리는 기존의 탈착형 계류 장치에 비해 계류 라인으로 부유식 해상풍력 터빈을 보다 쉽게 탈부착할 수 있도록 고안되었다. 8MW급 부유식 해상풍력발전기에 적용 가능한 반잠수식 계류 풀리의 초기 설계에 대한 구조적 안전성을 검토하기 위해 3D 프린터를 이용하여 축소구조모형을 제작하고, 이 모형에 대한 구조시험을 수행하였다. 축소 모형의 구조시험을 위해 3D 프린팅에 사용된 ABS 소재의 인장 시편을 제작하고 인장시험을 수행하여 소재의 물성을 평가하였다. 인장시험에서 얻은 재료 특성과 축소모형 구조시험과 동일한 하중 및 경계 조건을 적용하여 반잠수식 계류 풀리의 유한요소해석을 수행하였다. 유한요소해석을 통해 반잠수식 계류 풀리의 구조적 취약 부분을 검토하였다. 반잠수식 계류 풀리의 주요 하중조건을 고려하여 구조모형시험을 수행하였으며, 재료의 최대인장응력 이상이 발생하는 위치에 대해 유한요소해석과 시험 결과를 비교하였다. 유한요소해석과 모형시험의 결과로부터 작동조건에서는 Body와 Wheel의 연결부 구조가 취약한 것으로 파악되었고, 계류조건에서는 Body와 Chain stopper의 연결부 구조가 취약한 것으로 검토되었다. 축소모형 구조시험에서 나타난 SMP의 구조 취약부는 구조해석의 결과와 일치하는 것으로 나타났다. 연구 결과를 통해 반잠수식 계류 풀리의 초기 설계에 대한 구조적 안전성을 실험적으로 검증할 수 있었다. 또한, 본 연구 결과는 상세설계 단계에서 반잠수식 계류 풀리의 구조 강도를 향상시키는데 유용하게 활용될 수 있을 것으로 판단된다.

작은 활차가 적용된 비행조종계통의 케이블 내구성 시험을 통한 피로 수명 비교

박혜은,박응선,김윤환,김승현,하도준 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11

항공기 내 직접조종방식 비행조종계통에 사용되는 Cable 및 Pulley(활차)를 이용하여 Cable 내구수명 시험을 수행하였다. 협소한 장착 공간으로 인해 권장 사이즈보다 작은 사이즈의 Pulley 가 적용되어있는 경우가 있는 데, 실제 내구성 시험 수행을 통해 Pulley 사이즈가 Cable 내구 수명에 미치는 영향성과 Cable 종류를 교체함으로써 요구되는 피로 수명을 만족할 수 있는 지에 대해 연구해보고자 한다. 시험 결과, 항공기 설계 시 권장 사이즈보다 작은 Pulley 를 사용하더라도 Cable 의 최적 선정을 통해 요구되는 피로 수명(3 배 이상의 피로수명 개선 필요) 확보가 가능함을 확인하였다. In this study, we performed cable endurance test with cable and pulley used in manual flight control system(MFCS). Since there is no enough space in the aircraft to apply the recommended size of pulley, the smaller size one is used for this test. It is studied that the effect of pulley size on cable’s fatigue life and be satisfied with required fatigue life by changing the cable type. This paper includes the implementation and result analysis of cable’s endurance test. As a result of this test, it is determined that using optimally selected cable secures the cable’s fatigue life (need to improve fatigue life more than 3 times) even though using smaller pulley than the recommended size.

V 벨트풀리의 피로수명해석

김용수(Yongsu Kim),김범근(Beomkeun Kim),안성훈(Sung-Hoon Ahn),천두만(Doo-man Chun),장재덕(Jae-Duk Jang) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10

Fatigue life of a V-belt pulley, which is commonly used in automotive powertrain to transfer power to other parts, is predicted based on damage analysis by finite element analysis (FEA). Load conditions on pulley are analyzed by considering interactions among the pulley, V belt, bracket and bolts. Both normal force and traction force on the contact surfaces between the pulley and V belt were calculated. Assembly load due to the tightening of the bolts as well as operation load was considered to describe the actual load conditions in durability test. Static analysis at initial position of the pulley after assembly was performed with given load conditions. Using stress history data calculated from FE analysis, damage over one rotation of pulley was calculated and fatigue life, number of rotation to failure, was estimated. Durability test for the pulley used in the analysis was followed to verify the analysis results. Comparison between analysis and experimental results showed that analysis results correlated with the experimental results closely.

워터펌프 사양에 따른 엔진성능해석

조대용(Daeyong Cho),송현우(Hyunwoo Song),오희창(Heechang Oh),박정서(Jeongseo Park),배충식(Choongsik Bae) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11

In this study, water pump pulleys with three different sizes were tested to evaluate effect of water pump system on engine performance. Temperatures and pressures of each part in engine were measured to investigate thermal behavior of cooling water with different pump types. Analysis of engine performance and exhaust gas were conducted. Fuel consumption was measured in each engine operating condition. Finally, experimental results with three types of pump are compared each other to find optimal choice for engine performance. The water pump with smaller size pulley showed longer engine heating time at low speed operation. In contrast, water pump with bigger size pulley showed faster engine heating speed. In fuel consumption, the case of smaller pulley demonstrated lower fuel consumption at medium and high speed; also carbon dioxide and NOx emission was reduced in same case.

댐퍼 풀리 이탈 성능 시험 방법에 관한 연구

김효성(H. S. Kim),추용주(Y. J. Chu),김규식(K. S. Kim),이봉현(B. H. Lee) Korean Society for Precision Engineering 2019 한국정밀공학회 학술발표대회 논문집 Vol.2019 No.5월

장애인용 웨이트풀리 운동기구 예비 사용성 평가: 운동기구 및 보조장치 개선점 도출을 중심으로

김주희(J. H. Kim),김성신(S. S. Kim),최묘정(M. J. Choi),권효순(H. Kwoen),안광옥(K. O. An),배영현(Y.-H. Bae) Korean Society for Precision Engineering 2022 한국정밀공학회 학술발표대회 논문집 Vol.2022 No.10