一种伞衣织物透气性快速预测算法

A Fast Permeability Estimation Method for Parachute Fabric

伞衣织物透气性是决定降落伞气动特性的重要因素,因此快速而准确地预测伞衣织物透气性将能够有效减少透气性试验次数并提高降落伞仿真计算可靠性。文章根据降落伞伞衣织物材料的结构特点,基于多孔介质透气性理论提出了一种伞衣织物透气性预测算法,该算法可以在缺乏透气量试验数据的情况下,仅根据伞衣织物厚度和标准透气量大小快速计算得到该伞衣的透气性曲线(压差–透气量曲线)。应用该算法对多种国际上常见伞衣织物材料的透气性进行了计算,并给出了相应透气性参数预测结果。为进一步分析该预测算法的可靠性和适用范围,基于任意拉格朗日–欧拉方法建立了织物透气性仿真试验流固耦合模型,将上述预测得到的织物透气性参数用于仿真试验中,并将预测结果与试验数据进行了对比分析。结果表明,文章提出的算法对常见伞衣织物在中低压差下的透气量具有较好的预测精度,能够方便快速地预测各类不同伞衣织物在降落伞工作过程中的透气性能,可被用于降落伞的工程设计、性能计算、仿真分析等工作之中。

A parachute fabric permeability prediction method is proposed based on the Ergun theory. By applying this method, parachute fabric air permeability can be predicted without sufficient test data. A permeability predictions are made on a variety of common parachute fabrics over a range of pressure differentials, and the predicted results are analyzed by comparing with test data. An FSI model for fabric permeability test simulation is built by using Arbitrary Lagrangian-Eulerian method, the numerical simulation is conducted to further verify the reliability and adaptability of the simplified model. The results from this investigation indicate that the simplified model has high prediction accuracy on a variety of parachute fabrics under parachute operational pressure differentials.