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针对体积庞大的火箭弹轴向尺寸和径向尺寸难以测量的问题,提出了一种基于位移传感器的火箭弹几何尺寸测量系统。首先将弹体稳定支撑,然后通过测量装置对火箭弹轴向尺寸、径向尺寸及翼展进行测量,最后对测量结果进行精度分析。结果表明,文中提出的火箭弹几何尺寸检测系统,可用于直径达500mm、长度达5000mm的火箭弹的非接触测量。并实现对火箭弹的径向尺寸和轴向任意两点之间距离以及翼展的测量,具备测量精度高、自动化程度好、测量时间短、实用性强等优点。 相似文献
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考虑多重影响因素的巡航飞行器增程优化设计研究 总被引:1,自引:0,他引:1
为有效提升现有巡航飞行器的航程,在不改变飞行器总体布局的情况下,考虑气动特性、质量等多重因素影响,研究了某巡航飞行器增程优化技术。首先,分析了巡航飞行器在典型飞行任务下的气动特性以及优化所需的有效参数;其次,构建了机翼翼展变化时翼展长度与机翼面积的映射模型,估算了不同翼展长度情况下飞行器质量的变化;然后,以翼展长度作为直接设计变量,考虑计算精度与优化效率,设计了基于遗传算法与神经网络相结合的优化方法,完成特定飞行条件下的航程优化。仿真分析表明,在设计约束范围内,当翼展长度增加到原来的1.16倍时,其航程相比原来可以增加18.03%,达到性能最优,同时,将影响航程变化的质量要素纳入设计优化,提高了性能优化的精准性。本文方法具有一定的理论和应用价值。 相似文献
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2004年,瑞典国防部计划开发一种中空长航时无人机,预计2012年交付使用。该无人机将与战术无人机和瑞典未来的无人作战飞机(UCAV)配合使用并向其发出指示,将从2014年开始执行对地反应攻击任务。 相似文献
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《消防技术与产品信息》2008,(1):108-108
据报道,法国一家公司正在研制一种新型的无人驾驶飞机。该无人机不仅能在空中翱翔,还能浮在水面上,甚至潜入水下。这种依靠远程遥控的无人驾驶飞机取名为“埃利乌斯”。其样机长1.9m,翼展2.3m,重18kg。但预计于2009年推出的最终机型“个头”将会大一些,长2m,翼展4m,重75kg。 相似文献
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A basic equation system for meridional throughflow fields in multistage axial flow compressors has been deduced,containing many unknown correlation terms,which describe different kinds of spanwise mixing mechanism in aunified form.The equation system shows that spanwise mixing of meridional flows in compressors is attributedto three kinds of mechanism:molecular motion,turbulent diffusion,and circumferential non-uniformities,thelast of which includes secondary flow effects and others.Therefore the equation system unifies the two modelsfor spanwise mixing analyses by Adkins & Smith (1981) and Gallimore & Cumpsty (1986).With three kindsof apparent mixing coefficients defined and introduced into the basic equation system,a novel,much simplerequation system,without additional unknown correlation terms included,has been obtained.This novel equa-tion system makes throughflow computations including mixing far easier for multistage compressors.It hasbeen rigorously shown that these apparent mixing coefficients contain full information of all the three kinds ofmixing mechanism,so that the simpler equation system can also be taken as a unified model for meridional flowswith all the kinds of the mixing effects.Calculations of the flow through multistage machines have been madeby incorporating the new model into a streamline curvature throughflow calculation method and the improvedagreement with experimental data has been obtained.It is believed that the simpler equation system can beapplied to the flows not only in subsonic but in transonic and supersonic compressors if an appropriate modelis proposed for the apparent mixing coefficients. 相似文献
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