在振源数目未知的条件下,仅利用多通道观测混合信号准确分离源信息是信号源盲分离的技术难题之一。为了揭示观测振动混合信号的复杂组成结构,以及为振源信息盲分离提供可靠的先验信息,提出一种基于独立分量分析和聚类评估技术的信源数目估计方法。通过仿真试验与壳体结构试验台典型机械振动信号分析,定量比较基于信息理论的源数估计方法AIC/MDL与提出方法的性能,研究结果表明所提出方法可从振动调制混合信号中准确可靠地估计信源数目,具有更好的工程应用性能。

It has been challenging to correctly separate the mixed signals into source components when the source number is not known a priori. To reveal the complexity of the measured vibration signals, and provide the priori information for blind source separation, a novel source number estimation method is proposed based on independent component analysis (ICA) and clustering evaluation analysis. The performances of the proposed method and the information-based source number estimation methods are comparatively studied via numerical case study and experimental study on a thin shell structure, and the results show that the proposed method can correctly and reliably estimate the source number from the modulated vibration signals, and thus has more powerful performances in engineering applications.

电机振动为潜艇噪声的重要振源，掌握其特性对于优化艇体结构设计有着重要的意义。采用结构有限元耦合流体边界元的附加质量阻尼算法，对潜艇的2种不同位置激振的工况进行水下振动计算，并对数值计算结果进行了比较和分析。从离散频率的加速度值和功率两个层面上初步讨论了低频段内艉轴激振力与电机激振力对电机基座上加速度的影响。结果表明：在艉轴激振力比电机激振力大一个数量级的情况下，艉轴激振力对电机基座加速度的影响远小于电机激振力对其的影响，因而可以忽略。在实艇航行中，当艉轴与电机激振力同时存在的情况下，确保了电机振动特征信号测量的准确性。

The engine vibration is a major excitation source of submarine noise and requires substantial consideration during the structural design process. In this paper,an approach combining the finite element method with the boundary element method is proposed to calculate the underwater vibration of submarines with two different excitation sources- the propeller shaft and the engine. The acceleration effects on the submarine''s engine pedestal,produced by the low frequency excitation force from the two sources men-tioned above were also investigated. The obtained numerical results were compared and analyzed at differ-ent frequencies and power values. It was seen that the acceleration effects produced by the propeller shaft was quite small and could be safely neglected when the propeller shaft excitation was one order greater in magnitude than the engine vibration force. Overall,this observation could simplify and benefit the measure-ment of engine vibration characteristics in actual submarine

以水下有限长圆柱壳为对象,实验研究水下结构声辐射有源控制.实验中通过引入次级力源,以单个或两个误差点处的声压最小为目标函数,分析次级激振器和误差传感器布放（位置和数目）以及激励频率对控制效果的影响.结果表明：有源控制能够有效控制水下圆柱壳线谱噪声;增加次级激振器和误差传感器的数目,能够增大降噪区域;有源控制在3 000 Hz高频处对壳体噪声控制依然有效.有源控制能够对多线谱信号激励壳体辐射噪声产生抑制作用.

Experimental study on active control of a submerged cylindrical shell with finite length is performed using secondary force sources. The arrangement of the secondary exciters and error sensors and the influence of the excitation frequency on the control effects are analyzed. The results show that the underwater sound radiation of the cylindrical shell subjected to the force excitation can be effectively attenuated by the method of active noise control, the area of noise reduction can be enlarged with increasing the numbers of secondary exciters and error sensors, and the active noise control of the cylindrical shell at 3 000 Hz is still valid. Meanwhile, the sound radiated from the submerged cylindrical shell subjected to multiple linear spectrum excitations can also be suppressed by the active noise control.

以诗译诗与借形传神是卓振英《楚辞》英译文的特色。译者进行总体审度和合理调适,借用传统英语诗歌的四行诗体、双行偶韵诗体、三行诗体、五行诗体、十行诗体以及半格律半自由诗体等形式,努力再现《楚辞》的意境美,在很大程度上体现了以译入语文化为导向的翻译理念,这在深层次上是因为这种形式借鉴对英语世界读者更具亲和力,它是沟通译入语文化与源语文化的纽带。

The obvious features of ZHUO Zhen-yin’s English Version of The Verse of Chu lies the following aspects: “translating Chinese poetry into English poetry” and “adaptive employment of English poetic forms”. Through overall consideration and reasonable adjustment, the translator tries his best to reflect the beauty of artistic conception of the original text by using different forms of traditional English poetry, including quatrain, couplet, triplet, quintet, ten-line-stanza, and so on, which shows target language culture oriented conception. Such affinity form is a link between target language culture and source language culture.

福州地铁尚未建成时，需要对临近建筑物的振动响应进行预测。由此，建立车轨垂向耦合振动数值分析模型和隧道—土体—建筑物有限元模型，参考福州地铁振源参数及沿线典型II类场地土类型，对地铁运行后，临近建筑物的振动响应作出了理论预测。分析结果表明，地铁列车运行引发的环境振动主频以中高频振动为主，而建筑物各楼面峰值主频均为建筑物的自振频率。同时，在低层楼面存在激励振动的中高频反弹区。列车车速和单双线运行不影响建筑物的振动形态，但能显著影响楼面加速度振级。另外，当多层和小高层建筑至隧道中心水平距离小于10 m，高层建筑小于15 m及位于30 m左右处，车速超过40 km/h时，建筑物部分或全部楼层加速度振级可能超越相关规范规定的振动限值，需要考虑振动控制。

Two models were established for analyzing the vibration responses of buildings adjacent to Fuzhou Metro. One of them was for numerical analysis of vehicle-track coupled vertical vibration, and the other was the tunnel-soil-build-ing coupled model of 3D FEM. In reference of the vibration source parameter of Fuzhou metro and typical in-situ soil distri-bution of kind II along the Metro line, vibration responses of buildings adjacent to the Metro induced by the subway opera-tion were predicted. The results show that the vibration responses of the adjacent buildings are mainly the medium and high frequency vibrations, and the dominant frequencies of the floors are the natural frequencies of the buildings. Meanwhile, in the lower floors there exist medium-and-high frequency rebound areas due to the excitation. Speed and single-or-double track traveling of trains have no influence on the vibration type of the buildings, but have significant effects on the vibration acceleration lev