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长航时无人机飞行器管理计算机设计研究 被引量:1
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作者 徐奡 郑毓琦 《航空计算技术》 2008年第4期114-117,共4页
高高空长航时无人驾驶飞机对其任务可靠性和安全性提出了极高的要求,而飞行器管理计算机是保证飞机安全和任务执行的核心部件。飞行器管理计算机采用合适的冗余配置可以有效地提高可靠性和安全性。探讨了一种基于三模冗余(TMR)结构的相... 高高空长航时无人驾驶飞机对其任务可靠性和安全性提出了极高的要求,而飞行器管理计算机是保证飞机安全和任务执行的核心部件。飞行器管理计算机采用合适的冗余配置可以有效地提高可靠性和安全性。探讨了一种基于三模冗余(TMR)结构的相似余度容错计算机,描述了计算机的硬件组成以及为满足可靠性要求所采取的任务调度和余度管理算法。在计算机综合化小型化以及调试测试方法方面所进行的创新使计算机具有良好的测试性和维修性并能够适应未来航空电子发展的需求。 展开更多
关键词 高高空长航时无人机 飞行器管理计算机 容错
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Linearization method of nonlinear aeroelastic stability for complete aircraft with high-aspect-ratio wings 被引量:28
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作者 XIE ChangChuan YANG Chao 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第2期403-411,共9页
A linearization method and an engineering approach for the geometric nonlinear aeroelastic stability analysis of the very flexi- ble aircraft with high-aspect-ratio wings are established based on the little dynamic pe... A linearization method and an engineering approach for the geometric nonlinear aeroelastic stability analysis of the very flexi- ble aircraft with high-aspect-ratio wings are established based on the little dynamic perturbation assumption.The engineering practicability of the method is validated by a complex example.For a high-altitude long-endurance unmanned aircraft,the nonlinear static deformations under straight flight and the gust loads are calculated.At the corresponding nonlinear equilibrium state,the complete aircraft is linearized dynamically and the vibration modes are calculated considering the large deformation effects.Then the unsteady aerodynamics are calculated by the double lattice method.Finally,the aeroelastic stability of the complete aircraft is analyzed.The results are compared with the traditional linear calculation.The work shows that the geometric nonlinearity induced by the large structural deformation leads to the motion coupling of the wing chordwise bending and the torsion,which changes the mode frequencies and mode shapes.This factors change the aeroelastic coupling relationship of the flexible modes leading to the decrease of the flutter speed.The traditional linear method would give not only an imprecise flutter speed but also a possible dramatic mistake on the stability.Hence,for a high-altitude long-endurance unmanned aircraft with high-aspect-ratio wings,or a similar very flexible aircraft,the geometric nonlinear aeroelastic analysis should be a necessary job in engineering practice. 展开更多
关键词 aeroelasticity geometric nonlinearity FLUTTER large deformation solar energy
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