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航空学报  2015 

空中加油软管锥套组合体甩鞭现象动力学建模与分析

DOI: 10.7527/S1000-6893.2014.0343, PP. 3116-3127

Keywords: 空中加油,甩鞭现象,软管锥套组合体,多刚体动力学,建模

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Abstract:

软管锥套组合体特殊的刚-柔-液耦合结构使其甩鞭现象动力学特性极为复杂,尚无法准确建模分析,严重制约了现有抑制措施的有效性,大大限制了空中加油对接的成功率和安全性。为分析甩鞭现象的动力学特性,基于集中参数的多刚体动力学,提出一种包含软管弹性且长度可变的软管锥套组合体运动模型。软管被抽象为由无摩擦铰链相互串联的若干变长度刚性连杆,各连杆质量和受力假设集中于铰链处。同时考虑软管弯曲恢复力、软管收放、加油机牵连运动、重力、定常流、大气扰动以及加油机尾流等内外部因素,推导出迭代形式的软管锥套组合体运动方程。通过数值仿真,对不同对接速度、不同软管长度和恒力弹簧控制方式等因素对甩鞭现象动力学特性的影响进行分析。结果表明,在对接速度柔和、软管长度较长时,对接诱发的甩鞭现象程度较轻。恒力弹簧控制方式诱发类似简谐振动形式的甩鞭现象,根源在于软管收放控制范围有限,回卷滞后性明显无法匹配受油机对接速度。

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