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航空学报  2013 

高超声速飞行器飞行动力学特性不确定分析

DOI: 10.7527/S1000-6893.2013.0139, PP. 798-808

Keywords: 高超声速飞行器,乘波体,不确定性,区间分析,飞行动力学

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Abstract:

高超声速飞行器分析模型存在较大不确定性,其给出的动力学特性与真实值之间存在偏差,因此研究飞行动力学特性分析结果的可信度水平对控制系统设计具有重要意义。针对典型的乘波体构型高超声速飞行器,在建立气动/结构/推进相互耦合的动力学模型基础上,利用非概率区间来描述模型中的不确定参数,并将复特征根不确定范围求解问题转化为频率和阻尼比两个实数的不确定区间分别求解,给出了动力学模态特征根、频率及阻尼比的不确定边界。分别采用直接蒙特卡罗(DMC)模拟方法、基于泰勒展开的区间分析方法(TIAM)和基于多项式逼近的区间分析方法(CIAM)对高超声速飞行器飞行动力学不确定性进行了研究。结果表明CIAM计算时间适中,且给出的边界更为准确、安全,适合在控制系统设计和验证过程中使用。

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