共查询到20条相似文献,搜索用时 703 毫秒
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冲击载荷作用下金属防护外壳的防爆仿真分析 总被引:1,自引:0,他引:1
为了降低和防止爆炸冲击波对目标的破坏,提高防爆抗冲击能力,使用多孔材料或轻质材料设计多层复合结构,已经成为当前国内外防爆安全研究的热点.有限元分析是模拟爆炸实验的重要手段.鉴于目前飞机黑匣子不能满足在爆炸冲击的极限工作环境下正常工作的要求,采用通用有限元软件ABAQUS作为结构非线性动力学仿真分析的工具,调用显式分析模块ABAQUS/Explicit进行了数值汁算,提出并论证了采用中间柔性材料缓冲层的复合防护结构,能够延缓爆炸载荷对黑匣子核心单元的冲击作用,保护黑匣子内部模块不受严重破坏,为飞机黑匣子保护外壳的设计提供了重要指导. 相似文献
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飞机战伤机理研究是战伤抢修研究的前提和必要条件。飞机战伤仿真是进行战伤机理研究的最经济、最安全、最有效的手段。该文以某型飞机为例,用计算机模拟其在实战条件下受到敌方空对空、面对空、空对面、面对面等武器打击后飞机实际损伤情况(含飞机在地面遭轰炸、在空中遭导弹、炮弹打击等情况),建立了其战伤机理仿真系统的框架,介绍了该系统中的几何造型、接口模块、导弹爆炸、弹片穿透、战伤分布、损伤评估与抢修方案优选、图形显示等重点模块。该系统具有损伤预测、损伤评估和方案优化的功能,可为制定飞机结构战伤抢修预案提供依据。 相似文献
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1991年1月17日,美军第一枚制导炸弹的伊拉克巴格达邮电大楼爆炸的巨响,宣示着人类战争的脚步已经迈入了信息化战争的门槛。它使沉缅于机械化军事形态的人们恍然大悟,信息在战争中的作用远比飞机、坦克重要、芯片重于钢铁。[编者按] 相似文献
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基于OpenGVS的三维仿真软件的开发研究 总被引:2,自引:1,他引:2
视景仿真技术是在数值仿真的基础上以图形和动画来显示仿真的过程和结果,近年来视景仿真技术在军事领域上得到了广泛的应用。OpenGVS是专门用于实时3D图形开发的软件。该文在Multigen Creator 3D场景建模的基础上,采用OpenGVS来实现场景驱动,开发了一个导弹与飞机交战场景的仿真程序,并介绍了实现三维动画驱动时需要解决的几个关键问题,包括外部模型的导入,视点的选取,碰撞的检测,以及爆炸效果的产生等。这些技术的运用使得软件仿真的效果更加逼真。 相似文献
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对于软件漏洞分析复杂度过高的现状问题,本文认为其主要原因在于当前软件分析知识、技术及数据耦合程度高、各类知识与技术间缺乏有效编程接口连接,因而提出了将软件漏洞分析解耦合为知识、探索、状态等三层平面的设计。其中,状态平面可基于基础分析数据和既有的大数据操作接口表征程序分析状态及转换;知识平面与探索平面分别对应漏洞分析知识与技术/工具集合,本文从符号执行、污点分析、模式检测、模糊测试等现有技术类别中抽象出两平面间的知识与技术间的交互接口。在阐述三层平面的基础上,本文例举了实际漏洞分析应用场景,描绘出通过可编程接口连接各平面、以自由定制的方式发挥各平面间互补优势的愿景;期望随之努力达到打通各类知识、技术间的互通门槛,并融合数据处理技术以提升软件漏洞分析效能的效果。 相似文献
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移动机器人运动路径的搜索策略 总被引:1,自引:0,他引:1
针对移动机器人运动路径全局最优问题,采用基于模型的搜索策略实现了最短路径的快速搜索。具体方法是利用Hough变换提取立体障碍物的边缘信息,映射到二维平面上,建立移动机器人运行环境的栅格地图;采用目标距离信息对自由栅格赋值来简化栅格地图状态空间的建立和搜索策略的制定;采用路径链表在栅格地图的状态空间中执行相对最短路径搜索。路径搜索策略不需要执行复杂的运算,并且在完备性、时间复杂性、空间复杂性和最优化方面都达到了满意的效果。 相似文献
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Daniels J Anderson EW Nonato LG Silva CT 《IEEE transactions on visualization and computer graphics》2010,16(6):1560-1568
We introduce a flexible technique for interactive exploration of vector field data through classification derived from user-specified feature templates. Our method is founded on the observation that, while similar features within the vector field may be spatially disparate, they share similar neighborhood characteristics. Users generate feature-based visualizations by interactively highlighting well-accepted and domain specific representative feature points. Feature exploration begins with the computation of attributes that describe the neighborhood of each sample within the input vector field. Compilation of these attributes forms a representation of the vector field samples in the attribute space. We project the attribute points onto the canonical 2D plane to enable interactive exploration of the vector field using a painting interface. The projection encodes the similarities between vector field points within the distances computed between their associated attribute points. The proposed method is performed at interactive rates for enhanced user experience and is completely flexible as showcased by the simultaneous identification of diverse feature types. 相似文献
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A FORTRAN program utilizing an integral equation calculates 10 field quantities relating to the electromagnetic (EM) scattering of plane wave by a perfectly conducting half-plane buried in a finitely conducting layered half-space. The computing algorithm is executable on a computer of small storage capacity such as PDP 11/40 and as such is useful to many exploration scientists without the facility of a mainframe computer, for computing model curves to interpret field data. 相似文献
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叶筠筠 《数码设计:surface》2012,(8):146-148
在传统构成课的基础上,探索和实践更具有趣味性、操作性和时代性的设计基础教学。通过一系列整合的课题设计,让同学们在自我探索与创造的空间里,打破传统思维方式,尝试用点、线、面、色彩和肌理,将一个真实物体从常态衍变到非常态的视觉形象。 相似文献
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T. Birker 《Structural and Multidisciplinary Optimization》1995,9(3-4):214-219
Analytical solutions are obtained for least-weight trusses with a vertical support and a single point load in an arbitrary direction. The optimal layout is derived for displacement and stress constraints within a two-bar topology, with different permissible stresses for the two bars. The globality of the above solutions is verified by a numerical exploration of the design space. The results in this paper show a complete agreement with the general theory of plane generalized Michell structures outlined in Part I of this study. 相似文献
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Danilo M. Eler Marcel Y. Nakazaki Fernando V. Paulovich Davi P. Santos Gabriel F. Andery Maria Cristina F. Oliveira João Batista Neto Rosane Minghim 《The Visual computer》2009,25(10):923-937
Multidimensional Visualization techniques are invaluable tools for analysis of structured and unstructured data with variable
dimensionality. This paper introduces PEx-Image—Projection Explorer for Images—a tool aimed at supporting analysis of image collections. The tool supports a methodology that employs interactive visualizations
to aid user-driven feature detection and classification tasks, thus offering improved analysis and exploration capabilities.
The visual mappings employ similarity-based multidimensional projections and point placement to layout the data on a plane
for visual exploration. In addition to its application to image databases, we also illustrate how the proposed approach can
be successfully employed in simultaneous analysis of different data types, such as text and images, offering a common visual
representation for data expressed in different modalities. 相似文献
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In planetary landing exploration task, the images captured by the landing camera are nearly along optical axis which results in multi-resolution images of same terrain surface. Recovering the surface shape of landing terrain from descent imagery is of great value for lander to choose safe landing area. In this paper, a homography-based depth recovery method with descent images is addressed. At first, the parallax and scale change in descent images are analyzed. Second, the camera motion is optimized with SIFT features correspondence constraints. For dense depth recovery, a set of virtual parallel planes is assumed to slice the terrain and each plane induces a homography to warp back the second image to first image plane. Zero-normalized cross-correlation score is chosen to compute the correlation score and the correlation curve is smoothed by two Gaussian filters. The depth for each pixel is determined by the plane which has highest correlation value. At the end, some experiments are conducted, including different correlation computation, depth recovery with different terrain, and the error tests. The results show that the discussed method is feasible to recover the depth information overall. 相似文献