非概率可靠性在浮空器中的应用

浮空器属航空产品,其设计的可靠性直接影响产品的安全性.目前,浮空器产品大多是非批量生产,缺乏大样本数据,可靠性评估可利用区间非概率可靠性理论进行描述.文中论述了非概率可靠性基本理论,通过建立浮空器产品囊体结构失稳数学模型推导了囊体结构区间非概率可靠性指标的计算公式,然后以典型囊体结构件为算例,结合实验给出了囊体结构非概率可靠性指标数据曲线,对比了数值模拟和实验测算结果,得出理论值相对实测值偏保守的结论.非概率可靠性方法可反映结构在不同载荷状态下的可靠程度,对工程应用具有一定的指导作用.

Application of Non-probabilistic Reliability to Aerostat

As aviation product, the design reliability of aerostat affects its security. Usually the aerostat is not produced in batch, so it lacks large sample data. The reliability evaluation of the aerostat can be described by interval non-probabilistic reliability theory. In this paper the basic non-probabilistic reliability theory is firstly expounded. Then, the instability mathematical mode for envelope structure of the aerostat is established and the formula of interval non-probabilistic reliability index is deduced. Finally, with an example of the typical envelope structure piece, the reckoning method of non-probabilistic reliability index of envelope structure is obtained based on the experiment. By contrasting the numerical simulation result and experiment reckoning result, it is found that the theory result is more conservative. Non-probabilistic reliability method can reflect the structural reliability level under different loads, which can be used as guidance for engineering application.