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무기체계 성능개량 업무개선 방안 연구 - 함정무기체계 성능개량 시점판단을 중심으로
장영천,강경란,최석철 한국방위산업학회 2015 韓國防衛産業學會誌 Vol.22 No.2
최근 현존 군사력의 극대화와 효율적 운영을 위해 무기체계 성능개량에 대한 관심이 증가하고 있다. 현재 무기체계 성능개량의 절차에 관한 규정만 제시되어 있어, 어떤 기준으로 성능개량 시기를 판단하느냐하는 하는 중요한 문제에 대한 연구의 필요성이 있다. 따라서 본 논문은 기존의 성능개량 판단을 위한 분석평가의 경험을 바탕으로 6가지 판단기준 요소(기술변화주기, 내구연한, 창정비주기, 예산, 경제적수리한계, 가동률)를 이용하여 성능개량 시기를 판단하는 개선방안을 제안하고 해군 함정의 무기체계를 사례로 제시하고자 한다. According to the need of effectively managing and maximizing the existing military power, the military has recently paid attention on improving performances in weapon systems. Currently, the procedure for performance improvement in weapon systems exist while there is no regulatory guidance on decision. Therefore, we developed a methodology to quantitatively find decision points for PIP in weapon systems using the 6 considerations(the technology life cycles, the service life, the repair cycles in maintenance depot, budget, the economic repair limit, the rate of operation) is based on our long experiences of the analysis and assesment. Then, we apply the methodology to the one of the systems and components in ROKN DDH.
남찬혁(Chanhyuk Nam),최성진(Sungjin Choi),박은지(Eunji Park),명순식(Soonsik Myung) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
The brake system for commercial vehicles is a full-air type pneumatic brake system that uses the air pressure produced by the air compressors of the engine, unlike a brake system for general passenger cars. And the air barake system is applied to medium-sized trucks and buses in the city and intercity. The chamber of the air brake system generates the braking force by using the expansion force of the diaphragm through the compressed air in the chamber and the linear motion of the piston generated by the power spring force. Therefore, it is necessary to predict the durability of the brake chamber for the load conditions that occur during driving with the core parts related to the safety of the vehicle. In this paper, we tried to predict the cause of breakage and the durability life of the existing product due to the breakage of the vehicle mount of the air brake system during the vehicle test. In order to predict the durability, the acceleration signal obtained from the actual vehicle test was used. And the durability life of the air-brake camber was analytically approached using the durability analysis program FEMFAT. Also, the improvement of the existing product with the mount part is suggested.
습식 클러치용 단면 마찰판의 모델링을 통한 내구수명 연구
김창호(ChangHo Kim),송승훈(SeungHoon Song),이운영(WoonYeong Lee) 한국자동차공학회 2007 한국자동차공학회 Symposium Vol.- No.-
Modern automatic transmission is experiencing high engine torque and rather small room for installation. Therefore, transmission designers have a big concern to have optimized component to pack in a limited space. Higher warranty mileage is also a hurdle to challenge to design robust parts. For clutch designers, single sided plate is easy and space saving design compared to conventional double sided design. Furthermore, forecast of clutch life cycle is not fully developed thus leads lots of error to predict. A simulation model to find out the temperature from the heat that is generated during the clutch engaging was developed in this research, and prediction the life cycle with this temperature could be realized. Verification the model with the test pieces with SAE No.2 machine to find out the error between model and real clutches was also done. Consequently, a tool was developed to forecast the life cycle of clutches especially for single sided clutches that can be used clutch design.
저음확성기가 추가된 스페어타이어장착 리어 플로워패널 내구문제 개선을 위한 연구
박상근(Sangkeun Park),김성현(Sunghyun Kim),김태헌(Taeheon Kim) 한국자동차공학회 2018 한국 자동차공학회논문집 Vol.26 No.6
Vehicles have been developed in order to satisfy the durability requirements for convenient equipment. An improved durability analysis has been proposed to predict fatigue cracks on the rear floor panel due to the cycling load through a spare tire mounting bolt. In the case of a spare tire with the normal length of mounting bolt, and the combination of linear static analysis and rigid element modeling for the mounting bolt, neither insulation modeling nor strain-life method was enough to predict the durability performance on the rear floor panel. However, the analysis method was not enough to predict the cracks on the floor as the mounting bolt is longer for the installation of the subwoofer speaker, and the spare tire is reverberating more. DFSS was applied in order to find the root cause and solution of the floor panel crack issue. Therefore, nonlinear analysis(e.g., ABAQUS) was introduced to examine the contact between components, such as rear floor, insulator, subwoofer stowage, and spare tire. In addition, the insulators are modeled in detail. The improved analysis showed well-predicted results in z-direction load vibration test and vehicle durability test.
김병삼(ByeonSam Kim),송연민(YounMin Song),박경우(KyoungWoo Park) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Durability test data for slim test specimens were compared with the predicted fatigue life for verification. The final lifing of the component combines the effects of these microstructural features with the complex stress state arising from the combined service loading and residual stresses. An Finite elements analysis for door wiring harness(W/H) are used for residual stresses and dimensional stability with bending flexible. Durability test data for slim test specimens were compared with the numerical predicted fatigue life for verification.