中文摘要：

翼伞系统的飞行性能不仅取决于翼伞本身的气动特性，而且与安装角、伞绳长度、回收物阻力特征、翼载荷等系统参数密切相关。文章应用拉格朗日方程建立翼伞系统的纵向飞行力学模型，对翼伞系统进行飞行力学数值仿真，深入分析了系统参数以及开伞状态对翼伞系统纵向飞行性能的影响规律。结果表明：只有安装角在0°～20°时，翼伞系统才能达到稳定的滑翔状态，且安装角在4°～6°时对应两个稳定的滑翔状态，具体由开伞姿态和速度决定；伞绳特征长度的增加使系统的静稳定性增加；回收物的阻力特征增加6m^2，翼伞系统的稳定滑翔角增加15°左右，而迎角减小不到1°；翼伞飞行速度随着翼载荷的增加而增加。其平方与回收物质量成正比．上述结论可为翼伞系统的工程实际应用提供参考。

英文摘要：

Flight performance of parafoil-payload systems is not only dependent on the aerodynamic characteristics of the parafoil itself, but also closely related to the system parameters such as rigging angle, rope length, drag force characteristics of the payloads and wing loads. The longitudinal flight dynamic equations of a parafoil-payload system were developed by adopting Lagrange equations and used to compute the flight response of the parafoil-payload system. With the aerodynamic characteristics of the parafoil given, the effects of the system parameters and opening state on longitudinal flight performance were discussed. The results show that only the rigging angle is within 0°-20°, the parafoil-payload system can reach a steady state of glide. Furthermore, the rigging angle within 4°-6° corresponds to two steady states of glide, which is dependent on the opening pitching angle and the opening velocity of the system. Increasing the rope length will make the system static stability increased. The more the drag force characteristics of the payload, the more the glide angle of the parafoil-payload system. With the drag force characteristics of the payload increased 6 m^2, the glide angle of the system increases about 15°, while the attack angle decreases less than 1°. In addition, wing loads have significant influence on the flight speed of the system. The speed of a parafoil-payload system is increased with the increase of wing loads and the square of the speed is proportional to the mass of the payload. These conclusions can provide theoretical guidance for practical application of parafoil-payload systems.