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日本铁道车辆用新型逆变器 总被引:4,自引:0,他引:4
IPM是一种将驱动和保护电路集成于一体的智能功率器件。为了开发符合21世纪要求的高性能铁道车辆用逆变器,日本铁路采用了世界上最新的功率器件--高耐压智能模块(HVIPM),从而使原来采用3点式逆变电路改为2点式,大大简化了电路,缩小了体积,减轻了质量,提高了可靠性。本文介绍了3.3kV HVIPM器件在日本铁道车辆上的应用情况。 相似文献
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当前,禁止在内燃机零部件上使用铅作为合金元素的法规业已实施,并且,由于普遍应用混合动力、发动机小型化、低黏度机油、起动-停车系统等新技术来降低发动机的燃油耗及排放,曲轴轴承的工作环境变得更加苛刻。针对曲轴轴承工作环境的变化,着重叙述在实现发动机高功率、小型化及降低摩擦损失等方面开展的摩擦学研究,介绍轴承材料研发及其设计理念的创新与成果,也对在曲轴轴承上应用的新型表面处理工艺及减摩技术进行评价。 相似文献
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The mode mixity is defined based on nonoscillatory strain energy release rate components of delamination between two different orthotropic materials to evaluate the delamination behavior of laminated composites.The result showes that the relative location of the delamination through the thickness influences the mode mixity in a relatively well-regulated way,and that the reinforcement directions of the adjacent plies along the delamination front have a more complicated impact on the mode mixity.This is caused by the bending/twist coupling and bending/bending coupling in the stress field at the crack tip for delamination between multidirectional plies,which completely modifies the stress and strain fields ahead of the crack tip.These kinds of couplings account for the non-uniform distribution of mode mixity values along the delamination front.Application of appropriate mode mixity values is necessary for accurate prediction of delamination growth. 相似文献
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