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复合材料透波盖强度有限元分析
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作者 张军 张恒 +1 位作者 邱宗玺 孙卫青 《郑州大学学报(理学版)》 CAS 2002年第1期48-50,共3页
利用有限元方法对一种特殊形状的复合材料透波盖在承压工况下的强度进行了数值分析 ,揭示了应力分布特点 ,确定了最大变形区域及其应力状态 ,为透波盖的强度设计提供了理论依据 .通过对透波盖进行压力试验 。
关键词 复合材料 透波盖 强度分析 应力分布 最大变形区域 承载工况 有限元分析
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Optimizing the Layout of Rectangular Hull Tiles
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作者 吴年庆 赵耀 袁华 《Journal of Marine Science and Application》 2010年第3期307-311,共5页
Rectangular tiles can be laid on a ship's hull for protection, but the sides of the tiles must be adjusted so adjacent tiles will conform to the curvature of the hull.A method for laying tiles along a reference li... Rectangular tiles can be laid on a ship's hull for protection, but the sides of the tiles must be adjusted so adjacent tiles will conform to the curvature of the hull.A method for laying tiles along a reference line was proposed, and an allowable range of displacement for the four vertices of the tile was determined.Deformations of each tile on a specific reference line were then obtained.It was found that the least deformation was required when the tiles were laid parallel to a line with the least curvature.After calculating the mean curvature on the surface, the surface was divided into three layout areas.A set of discrete points following the least deformation of the principal curvatures was obtained.A NURBS interpolation curve was then plotted as the reference line for laying tiles.The optimum size of the tiles was obtained, given the allowable maximum deformation condition.This minimized the number of bolts and the amount of stuffing.A typical aft hull section was selected and divided into three layout areas based on the distribution of curvature.The optimum sizes of rectangular tiles were obtained for every layout area and they were then laid on the surface.In this way the layout of the rectangular tiles could be plotted. 展开更多
关键词 layout design laying rectangular tiles reference line principal curvatures size optimization
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Crustal Deformation Derived from GPS in the Chinese Mainland from 1991-2004
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作者 Cao Jianling Wang Hui +2 位作者 Wu Yanqiang Liu Xiaoxia Zhang Jing 《Earthquake Research in China》 CSCD 2015年第2期225-236,共12页
Based on GPS data from 1991- 2004 and the least-squares collocation method,we analyze the crustal deformation in the Chinese mainland. The results show that the first-order crustal deformation is unchanged in differen... Based on GPS data from 1991- 2004 and the least-squares collocation method,we analyze the crustal deformation in the Chinese mainland. The results show that the first-order crustal deformation is unchanged in different periods in the Chinese mainland,which reflects the background of regional tectonic activity. The strain rate is much higher in Western China,especially in the Qinghai-Tibetan Plateau and Sichuan-Yunnan area. The variations in different periods are related with seismicity of strong earthquakes during the same time. The GPS data after 2004 shows the post-seismic deformation of the 2001 Kunlun Mountains M S8. 1 earthquake. 展开更多
关键词 Chinese mainland GPS Present-day crustal deformation Least squaresCollocation
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