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基于全谱分析的转子裂纹-碰摩复合故障特征实验研究 被引量:5
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作者 胡爱军 林剑峰 马普 《动力工程学报》 CAS CSCD 北大核心 2018年第4期265-271,共7页
在转子实验台上模拟了不同转速下的碰摩故障、裂纹故障及相应的裂纹-碰摩复合故障,并采用全谱分析方法对其故障特征进行了分析。结果表明:相对于传统傅里叶频谱分析,全谱分析方法能准确识别3类故障,利用全谱图中-2 X、-3 X和-4 X倍频分... 在转子实验台上模拟了不同转速下的碰摩故障、裂纹故障及相应的裂纹-碰摩复合故障,并采用全谱分析方法对其故障特征进行了分析。结果表明:相对于传统傅里叶频谱分析,全谱分析方法能准确识别3类故障,利用全谱图中-2 X、-3 X和-4 X倍频分量表征了碰摩-裂纹复合故障的耦合特性,为转子复合故障诊断提供了参考。 展开更多
关键词 转子系统 全谱分析 裂纹-碰摩复合故障 耦合特性 实验研究
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Quantitative assessment of physiological cerebrospinal fluid flow in the cervical spinal canal with 3.0T phase-contrast cine MRI
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作者 Hua Shang huaijun +3 位作者 Liu Leka Yan Jianming Lei Caixia Cui Hui Li 《Neural Regeneration Research》 SCIE CAS CSCD 2012年第18期1392-1397,共6页
A total of 50 healthy volunteers aged between 18 and 54 years underwent phase-contrast cine MR to assess cerebrospinal fluid flow characteristics in different regions of the vertebral canal. The results revealed that ... A total of 50 healthy volunteers aged between 18 and 54 years underwent phase-contrast cine MR to assess cerebrospinal fluid flow characteristics in different regions of the vertebral canal. The results revealed that the cerebrospinal fluid peak flow velocity and peak flow rate in the systolic phase were significantly greater than those in the diastolic phase at the same level in the subarachnoid space of the cervical spinal canal. The ventral peak flow velocity and peak flow rate were significantly greater than the post-lateral peak flow velocity and flow rate, while there were no differences between left and right post-lateral subarachnoid peak velocity and flow rate. Moreover, there were no significant differences in peak flow velocity and peak flow rate between the systolic and diastolic phases, ventral, right post-lateral or left post-lateral peak flow velocity and peak flow rate at the same level in the subarachnoid space of the cervical spinal canal among different age groups (18 24, 25 34, 35-44, ≥45 years). 展开更多
关键词 magnetic resonance imaging PHASE-CONTRAST cerebrospinal fluid vertebral canal subarachnoidspace flow velocity neural regeneration
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