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Effect of the end cap on the fragment velocity distribution of a cylindrical cased charge 被引量:4
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作者 Wei Liao Jian-wei Jiang +3 位作者 Jian-bing Men Shu-you Wang Mei Li Han Liu 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2021年第3期1052-1061,共10页
The prediction of the fragment velocity distribution of a cylindrical cased charge with end caps is one of the key issues to assess the damage efficiency of the warhead. However, limited work has been conducted to pre... The prediction of the fragment velocity distribution of a cylindrical cased charge with end caps is one of the key issues to assess the damage efficiency of the warhead. However, limited work has been conducted to predict the fragment velocity distributions along the axis of cylindrical cased charges with end caps. This paper presents a study of the velocity distribution of fragments caused by the explosion of a cylindrical cased charge with end caps. The fragment velocity distribution and the end cap velocity were determined by an X-ray radiography method, and the axial fragment distribution was determined by witness plates. It was found that the velocities of fragments, especially near the edge, were increased when the end caps were added, and the position of maximum velocity is closer to the non-detonation end. The fragment velocities were increased, and the fragment projection range was decreased with the increase of the thickness of the end cap. A formula for fragment velocity distributions of a cylindrical cased charge with end caps, which is based on Huang’s formula, was proposed by the theoretical analysis and data fitting and validated experimentally. The results indicate that the proposed formula is accurate in predicting the fragment velocity distribution along the axis of a cylindrical cased charge with end caps detonated at one end. 展开更多
关键词 Cylindrical cased explosive Fragments velocity end cap X-ray radiography Gurney formula
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Analysis of effect of pressure on surface accuracy for inflatable antenna 被引量:1
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作者 付丽 杜星文 万志敏 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2008年第6期786-789,共4页
Pressure is one of the important measures to control the surface accuracy of the reflector of inflatable antenna. Experiments and numerical analysis were carried out to highlight the effect of pressure on accuracy. Th... Pressure is one of the important measures to control the surface accuracy of the reflector of inflatable antenna. Experiments and numerical analysis were carried out to highlight the effect of pressure on accuracy. The rapid, contactless and low-cost digital photogrammetry system (DIES) was employed to investigate the effect according to its lightweight and flexible characteristics. Measurement data show that the best pressure and the best area in this pressure can be obtained. Numerical analysis was conducted to check the measurement result. It is indicated that there is a little difference between them attributed to wrinkle. Results of analysis and experiments show that surface accuracy of the reflector can be adjusted by controlling pressure. 展开更多
关键词 inflatable antenna surface accuracy SEAM end cap WRINKLE
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