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| 1 | 子宫内膜癌的MRI分期:欧洲泌尿生殖影像学学会指南显示文摘本研究目的是确定子宫内膜癌的MRI分期指南。由欧洲泌尿生殖放射学学会女性生殖系统分会组织,对欧洲10所医学院与1999年-2008年间发表的文献中关于子宫内膜癌MRI参数进行审核评议并取得专家一致意见。结果表明,高场强MRI至少应包括盆腔内器官的矢状面、斜横断面或斜冠状面(子宫体的长、短横断面)的2个T2加权序列。 | K.Kinkel R.Forstner F.M.Danza L.Oleaga T.M.Cunha A.Bergman 邢艳 | 2009 | 国际医学放射学杂志2009，32，5： | 9 |
| 2 | Experimental Dynamic Analysis of a Breathing Cracked Rotor显示文摘Crack fault diagnostics plays a critical role for rotating machinery in the traditional and Industry 4.0 factory.In this paper,an experiment is set up to study the dynamic response of a rotor with a breathing crack as it passes through its 1/2,1/3,1/4 and 1/5 subcritical speeds.A cracked shaft is made by applying fatigue loads through a three-point bending apparatus and then placed in a rotor testbed.The vibration signals of the testbed during the coasting-up process are collected.Whirl orbit evolution at these subcritical speed zones is analyzed.The Fourier spectra obtained by FFT are used to investigate the internal frequencies corresponding to the typical orbit characteristics.The results show that the appearance of the inner loops and orientation change of whirl orbits in the experiment are agreed well with the theoretical results obtained previously.The presence of higher frequencies 2X,3X,4X and 5X in Fourier spectra reveals the causes of subharmonic resonances at these subcritical speed zones.The experimental investigation is more systematic and thorough than previously reported in the literature.The unique dynamic behavior of the orbits and frequency spectra are feasible features for practical crack diagnosis.This paper provides a critical technology support for the self-aware health management of rotating machinery in the Industry 4.0 factory. | Chao-Zhong Guo Ji-Hong Yan Lawrence A.Bergman | 2017 | Chinese Journal of Mechanical Engineering2017，30，5： | 2 |
| 3 | 利用强非线性减振器的模态能量再分配缓解大型结构的冲击响应显示文摘采用一种轻型几何非线性附件,强非线性减振器(SNA),以抑制线性大型九层结构的冲击响应.SNA的作用不仅是耗散能量,而且重新分配结构模态之间的冲击能量.本文研究单自由度(SDOF)和双自由度(Two-DOF)的SNAs.冲击能量再分配的定量结果表明,在强几何非线性的情况下,这种结构可以实现从低频到高频的非线性单向能量传递.具体而言,在锁定SNA、单自由度SNA和双自由度SNA的情况下,较高结构模态耗散的冲击能量百分比分别为0.08%,0.43%和30.04%.结果表明,与单自由度SNA相比,双自由度SNA能够将更多的能量快速散射到更高的频域,从而更快地降低主结构的冲击响应.还研究了在不同冲击强度下SNA性能的鲁棒性,其中双自由度SNA在从低频到高频散射冲击能量时表现出更强的鲁棒性.最后,采用等效阻尼技术来验证和量化主结构中模态能量的重新分布,并讨论这种新型被动减震方法的潜在应用. | 李响 lireza Mojahed 陈立群 Lawence A.Bergman Alexander F.Vakakis | 2022 | Acta Mechanica Sinica2022，38，6： | 1 |
| 4 | 考虑过阻尼模态参与的改进复模态叠加法显示文摘为处理非比例阻尼系统可能出现的过阻尼模态,提出了一种改进的复模态叠加强迫振动分析方法,建议无论模态是否过阻尼,复模态振动分析时应成对使用复模态.以一个连接任意布置外部阻尼器的悬臂梁典型非比例阻尼系统为例,其第1阶模态会随阻尼系数的增加而过阻尼.在厘清复模态响应与实际动力响应关系的基础上阐述了采用改进复模态叠加法获得时域响应、传递函数和方差的完整理论方法.将方程分为实部和虚部,使得原复数域运动方程成为基于实数矩阵的增广状态空间方程,从而克服了采用复数矩阵计算时变响应的困难.此外,针对基于白噪声滤波的外部激励,提出了一种高效方差响应评估方法,降低了计算资源消耗.结果表明,相较于假设模态法,复模态叠加法的结果更接近于有限元结果.基于遍历法研究最优阻尼器参数和位置时,采用多个小阻尼阻尼器优于单个大阻尼阻尼器. | 陈勇 Donald M.Mc.Farland Billie F.Spencer,Jr Lawrence A.Bergman | 2023 | Journal of Southeast University(English Edition)2023，39，3： | 0 |
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