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The fragmentation of d-shaped casing filled with explosive under eccentric initiation

defence Technology（防务技术） 2018年第5期14卷 417-421页

作者： Zhi-wei Guo Guang-yan Huang Wei Zhu Shun-shan Feng State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology

With the technical development of new warhead designs and improvised explosive device protection,irregular casing filled with explosive has been paid more attention recently. In this paper, we studied the fragmentation of a type of d-shaped casing, which is a common asymmetric casing in the field of warhead design. Based on the radiograph technique, static explosive experiments were conducted with d-shaped casings under four different eccentric initiation ratios to explore their fragmentation. A numerical model was then established to simulate the dynamic response of d-shaped casing filled with explosive. The results of numerical simulation were found to agree well with the experimental data.According to the results of numerical simulation and experimental data, the dynamic responses of dshaped casing were analyzed. The results of the current work pave way for the innovative design of new warhead and for further studying the dynamic response of asymmetric casing.

关键词： d-shaped casing Eccentric initiation X-ray radiograph technique Fragmentation Numerical simulation

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New Traveling-Wave Antenna Resonating at 6 GHz Based on Artificial Transmission Line Metamaterial Structures for RF Portable devices

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Open Journal of Antennas and Propagation 2013年第2期1卷 5-10页

作者： Mohammad Alibakhshi Kenari Electrical Engineering department Shahid Bahonar University of Kerman Kerman Iran.

design of new metamaterial (MTM) traveling-wave antenna with “d-formed” left-handed structure is proposed. The proposed MTM structure is designed at a height of 0.8 mm from the ground plane with almost 2 GHz bandwidth. The most interesting feature of the design is the ability of enhancing the gain and total efficiency of the antenna without negative effects of the other important parameters like bandwidth. By using the “d-shaped” MTM structure and printed planar technique, the bandwidth of the MTM traveling-wave antenna is significantly increased at a resonant frequency of 6 GHz and also a foot print area reduction of the antenna structure is provided. Antenna size is 7.2 × 5 × 0.8 mm3. The proposed antenna is suitable for RF portable devices operating at 6 GHz.

关键词： Small Broad Band Antenna Metamaterial (MTM) d-shaped Antenna Structure RF Portable devices Traveling-Wave Antenna

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