排序方式: 共有88条查询结果,搜索用时 609 毫秒
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硬质聚氨酯泡沫塑料填充薄壁钢管横向压缩吸能特性分析 总被引:2,自引:0,他引:2
为研究硬质聚氨酯泡沫塑料填充薄壁钢管后的吸能特性,对单钢管、钢管嵌套系统及填充硬质聚氨酯泡沫塑料后的钢管进行横向静力压缩试验,并对试验结果进行对比分析。结果表明:硬质聚氨酯泡沫塑料填充管比空钢管的吸能效果有明显提高,其中双钢管嵌套系统填充硬质聚氨酯泡沫塑料后吸能效果提高最明显,三钢管嵌套系统吸收外来的能量值最大。薄壁钢管填充硬质聚氨酯泡沫塑料是一种性能优良的吸能装置,在防护工程中可作为隔爆抗侵彻材料。 相似文献
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《防务技术》2022,18(9):1643-1652
To objectively obtain the three-dimensional coordinates of the projectile fuze proximity explosion when projectile intersects the head of missile target, we propose a dynamic seven photoelectric detection screen test method, which is made up of six plane detection screens and a flash photoelectric dynamic detection screen. The three-dimensional coordinates calculation model of the projectile proximity explosion position based on seven plane detection screens with dynamic characteristics is established. According to the relation of the dynamic seven photoelectric detection screen planes and the time values, the analytical function of the projectile proximity explosion position parameters under non-linear motion is derived. The projectile signal filtering method based on discrete wavelet transform is explored in this work. Additionally, the projectile signal recognition algorithm using an improved particle swarm is proposed. Based on the characteristics of the time duration and the signal peak error for the projectile passing through the detection screen, the signals attribution of the same projectile passing through six detection screens are analyzed for obtaining precise time values of the same projectile passing through the detection screens. On the basis of the projectile fuze proximity explosion test, the linear motion model and the proposed non-linear motion model are used to calculate and compare the same group of projectiles proximity explosion position parameters. The comparison of test results verifies that the proposed test method and calculation model in this work accurately obtain the actual projectile proximity explosion position parameters. 相似文献
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世纪大厦原设计建筑高度为99.8m,在施工过程中加层,导致该建筑超过100m,原消防设计已不能符合国家标准规范的相关规定,针对这一问题,对该建筑消防设计进行分析和探讨,提出了合理的消防设计修改方案,为此类建筑的消防设计审核提供参考。 相似文献
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针对目前水面舰艇对火力兼容性的需求,分析了基于垂直发射武器系统的火力兼容问题的特点。通过建立垂直发射导弹的弹道仿真模型及蒙特卡洛法仿真,分析了导弹垂直段和转弯段弹道的散布特点。结合弹道特点和火力兼容问题所研究的重点提出了建立基于垂直发射武器系统的火力兼容控制模型的方法,并初步给出了一个模型,对解决垂直发射武器火力兼容问题有一定借鉴意义。 相似文献
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刘喜斌 《中国人民武装警察部队学院学报》2001,17(1):53-55
对几种常见均匀对称刚体的动能给出了另一种计算方法,并举例说明了应用这种方法求解相关问题时在一定程度上可简化计算过程. 相似文献
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美国海军的新型舰载垂直发射装置 总被引:3,自引:0,他引:3
简要介绍了美国海军新型舰载垂直发射装置CCL,分析了其组成、性能、结构和所使用的电气设备,指出了它的优点. 相似文献
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随着世界各国小口径枪弹的装备使用 ,其射击精度问题倍受关注。以我国新研制的某 1型小口径枪弹试验数据为基础 ,利用外弹道学理论 ,经过与某 2型枪弹的对比计算 ,对某 1型小口径枪弹的射击精度进行了客观分析。 相似文献
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