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机械设备在运转时,不同状态下滚动轴承监测数据存在较大分布差异且难以获取带标签的数据,导致现有模型在跨工况条件下故障诊断准确率低.针对滚动轴承跨工况诊断难题,论文提出一种基于领域自适应的跨工况滚动轴承故障诊断方法,该方法首先提取振动信号故障敏感特征,并将其嵌入Grassmann流形空间,避免直接进行特征变换导致特征失真;... 相似文献
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Bi_2Se_3, as a three-dimensional topological insulator, has attracted worldwide attention for its unique surface states which are protected by time-reversal symmetry. Here we report the synthesis and characterization of high-quality singlecrystalline Bi_2Se_3 nanowires. Bi_2Se_3 nanowires were synthesized by chemical vapor deposition(CVD) method via goldcatalyzed vapor-liquid-solid(VLS) mechanism. The structure and morphology were characterized by scanning electron microscopy(SEM), transmission electron microscopy(TEM), x-ray photoelectron spectroscopy(XPS), and Raman spectroscopy. In magnetotransport measurements, the Aharonov–Bohm(AB) effect was observed in a nanowire-based nanodevice, suggesting the existence of surface states in Bi_2Se_3 nanowires. 相似文献
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