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- W253737993 abstract "Abstract : Fatigue cracks of the turbocharger are often observed for high performance engines under thermal shock tests. Maximum exhaust gas temperature of recently developed gasoline engines could reach approximately 950°C. It's very important to estimate transient temperature histories during thermal shock cycles to predict the stress and the fatigue life of the turbocharger. With these temperature profiles, temperature-dependent material properties and boundary conditions, we could identify critical locations by the application of finite element simulation technologies. In this paper, we applied the reliable analysis approach to the actual turbocharger to predict the weak locations due to the repetitions of plastic strains and compared the results with the crack locations under physical engine test. Key words : Turbocharger(터보차져), DI engine(직접분사방식 엔진), Thermal shock cycle(열충격 사이클), FEM(유한요소법), Transient state(비정상상태), Plastic strain(소성변형률) 1. 서 론 1) 자동차의 내연기관은 피스톤이 상사점에서 하사점으로 내려갈 때 연소실 내의 부압으로 혼합기 또는 공기를 빨아들이게 되며, 이 같은 방식을 자연흡기(natural aspiration) 방식이라 한다. 그러나 엔진은 흡입과정에서 여러 가지 저항을 받고 있으므로 실제 흡입되는 공기의 양은 실린더 크기보다 적게 된다. 따라서 흡입량을 늘리기 위해 밸브 수를 늘리거나 밸브 직경을 크게 하기도 하지만 또 하나의 방법으로 터보차져를 사용하여 터빈을 강제적으로 돌려 흡입공기의 압력을 높이면 많은 공기가 실린더내로" @default.
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- W253737993 date "2011-01-01" @default.
- W253737993 modified "2023-09-23" @default.
- W253737993 title "Thermal Structural Analysis of the Engine Turbocharger under the Transient Temperature History Corresponding to the Motoring Fatigue Test" @default.
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