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亚超结合型是较为新颖的导弹总体设计概念,它具有亚音速导弹射程远,起飞质量小优点,又具有超音速导弹高速突防的性能。根据国外亚超结合导弹的动态,立足国内水平,探讨了亚超结合型导弹的外形布局、部位安排等有关问题。 相似文献
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将赛络菲尔纺纱和包芯竹节纱联合起来,纺制出赛络菲尔包芯竹节纱,既是传统纺纱和花式纺纱的一种结合,又是一个大胆的尝试。这种结合使纱线的毛羽大大降低并且强力显著增加,变化的节距也赋予竹节纱更漂亮的外观。本文以变化的捻系数和变化的后区牵伸倍数,通过设计的方案进行纺制花式纱线并以一定的测试仪器对纱线的各项性能进行检测,综合分析最后的测试结果,以获得最佳的纺纱工艺。 相似文献
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为在纺制复合纱线的同时探索纺制纱线的最佳纺纱工艺,结合赛络菲尔纺纱、包芯竹节纺纱,采用了改变纱线的捻系数和细纱后区牵伸倍数的几个不同试验方案;测试了根据不同方案纺制出的纱线的线密度、竹节粗度、纱线强力、捻度和毛羽性能;通过试验得出纺纱捻系数为380、后牵伸倍数为1.30的最佳纺纱工艺。 相似文献
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以某火控系统为例,在火控系统数学模型复杂而无法从理论上推导一阶偏导数的函数解析表达式时,提出了用数值微分法求解复杂火控系统数学模型的一阶偏导数(即误差传递系数),详细介绍了数值微分公式和微分步长的选取以及数值微分结果的确定,并用MonteCarlo统计数学方法进行了验证,说明了用数值微分法求取一阶偏导数数值进行系统精度分析的正确性。 相似文献
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A nonlinear terrain following(TF) and terrain avoidance(TA) controller is proposed for missile control systems. Based on classical TF algorithm (adaptive angle method), a new method for TF controller is proposed by using angle of attack. A method of obtaining terrain outline data from digital elevation map (DEM) for TF control is discussed in order to save store space. A TA algorithm is proposed by using bank-to-turn technique. The block control model, which is suitable for backstepping design, is given for nonlinear model of missile. Making full use of the characteristics of the system and combining block control principle and backstepping technique, a robust controller design method is proposed. Uncertainties in every sub-block are allowed, and can be canceled by using the idea of nonlinear damping. It is proved that the state tracking errors are converged to a neighborhood of the origin exponentially. Finally, nonlinear six-degree-of-freedom simulation results for the missile model are presented to demonstrate the effectiveness of the proposed control law. 相似文献