Abstract The effect of annealing on the microstructure and magnetostriction of Tb 0.3 Dy 0.7 Fe y for 1.4 ≤ y ≤ 1.7 was investigated. As the y value decreased, the volume fraction of the eutectic phase increased and this phase leaked out from a sample during annealing above the eutectic temperature, which significantly changed the magnetostrictive properties. We compare the effects of leakage of the eutectic phase and annealing on the magnetostriction and discuss the reasons.
본 논문에서는 자율주행을 위한 효율적인 물체인식 및 최적제어 기법을 제안한다. 제안된 시스템은 라인스캔 카메라를 사용하여 트랙 차선 중심을 정확하게 인식하도록 설계되었으며, LoG Filter를 활용하여 필터링 기능을 구현하였다. 실제 차량에서 많이 사용되고 있는 Infineon사의 TC275 모델에서의 MCU Board를 사용하여 자율주행 모형차 시스템을 제작하였다. 구현된 시스템은 카메라 센서를 통해 차선의 중심을 인지하여 차량을 정확한 위치를 찾도록 조향 조절이 가능하고, 나아가 규정 속도를 유지해주는 PID제어가 가능하다. 제안된 기법의 성능을 평가하기 위해서 속도 제한구역과 장애물 출현 등으로 인한 특수상황을 고려하여 실험을 수행하였다. 실험 결과를 분석하여, 제안된 시스템이 우수한 성능을 보임을 입증하였다.
A good fluidity of high strength Al-alloys is required to cast thin wall castings needed to reduce the weight of cast parts. The fluidity, measured as the length to which the metal flows in a standard channel, is affected by many factors, such as the pouring temperature, solidification type of the alloy, the channel thickness, melt head, mold materials and temperature, coating etc. Therefore the experimentally measured fluidity scatters very much and makes it difficult to estimate the fluidity of a melt with a few measurements. The effect of Ti content and grain refinement on the fluidity of high strength aluminum alloy was investigated with a test casting with 8 thin flow channels to reduce the scattering of the fluidity results. The fluidity of Al-4.8%Cu-0.6%Mn Al-6.2%Zn-1.6%Mg-1.0%Cu and well-known commercial aluminum alloy, A356 was tested. Initial content of Ti was varied from 0 to 0.2wt% and Al-5Ti-B master alloy was added for grain refinement. The flow length varied linearly with superheat. By adding Ti and Al-5Ti-B, the fluidity increased. The grain size decreased by adding grain refiner at the same time. The fluidity depended on the degree of grain refinement. The fluidity of the alloy solidifying in mushy type is improved by grain refinement, because grain refinement increases the solid fraction at the time of flow stoppage.
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