翼伞

Recently it has been a hotspot in airdrop and recovery. But its academic research could not keep up with its development in engineering.

目前翼伞系统已成为空投和回收领域研究的热点，但理论研究的水平还远不能满足工程应用的需求。

Civil aircrafts and their accommodation equipment are researched and developed according to the standards of US Federal Aviation Agency and the main products are hot-air balloons, paragliders, paramotors, hot-airships, airliner passenger-seats, life-jackets, oxygen-supply masks and etc, most of which have obtained Airworthy Certificate CCAR and Certificate CCAR-TSOA.

民用航空器和民航生活设施均按照美国联邦航空局标准研制，主要产品有热气球、滑翔伞、动力翼伞、热气飞艇、民机座椅、民航救生衣、供氧面罩等，其中多项产品已经取得CCAR适航证和CCAR-TSOA证书。

Represents hang gliding, paragliding and powered paragliding in South Africa. Provides a flying site guide and insurance cover for visiting pilots, and can put them in contact with local pilots and flying schools.

在南非演示悬挂式滑翔，翼伞和动力翼伞飞行活动，向飞行中的驾驶员提供飞行地点安全指导，并与地方驾驶员和航空飞行学校保持联系。

Homing project research of parafoil system on optimal control was developed. And the characters of it were analyzed and summarized. To solve the optimal control problem, some methods about pre-solver analysis and treatment were put forward, such as moving equations translated into frame of wind and normalized.

在最优控制的求解中，提出了向风坐标系转化、无量纲化等解前分析的思想，简化了计算，方便了加权因子的选择，使目标点可达与不可达的翼伞系统归航轨迹最优控制问题得到了统一的求解。

The Jungfrau region means countless oppor - tunities for day trips on the water or dry land, for walking, cycling, swimming, wind - surfing, sailing, for experiencing unforget - table adventures such as tandem paragliding, for window shopping and culinary enjoyment.

少女峰地区有着数不清的水上或陆地日间旅游项目，可以漫步、骑车、游泳、风帆冲流、驾驶帆船；还可以体验难忘的冒险活动，如串联式翼伞滑翔；也可以浏览购物，尽享烹饪乐趣。

Simultaneously, several control strategies were brought forward in view of the basic flight properties of parafoil system.

仿真结果表明，建立的控制器和控制策略是可行的，两者结合能有效地提高翼伞系统的抗风性能和着陆精度。

In parafoil system equipments for measurement and control are normally settled on recovery. In order to realize precise homing control of the system, the relative motion between recovery and parafoil was analyzed.

翼伞系统的测量及操纵设备通常安装在回收物上，为了实现翼伞系统的精确控制归航，分析了回收物和伞体之间的相对运动情况。

In this thesis, the problems, related with research of automatic and precise homing of parafoil system, were analyzed thoroughly and systematically in method of theoretical analysis and numerical simulation, including dynamics, trajectory design and trajectory following.

本文以&实现翼伞系统自主、准确归航&为中心，采用理论分析与数值仿真相结合的方法，对翼伞系统动力学、航迹规划和跟踪控制问题进行了比较系统深入的研究，得到了若干有意义的结论。

The rigid character of parafoil was analyzed. A position prediction method based on differential coefficient for parafoil control rope pulling course was put forward. The purpose was to improve airdrop precision.

通过翼伞系统的刚性特性出发，提出了一种基于微元分析的翼伞操纵绳拉动过程中的运动位置解算方法，有利于提高翼伞空投的精度。

The improvements in the IAGA contained adding strengthen operator, improving evaluation index of premature, etc. Multi-phase homing project, making use of the flight properties of parafoil system in gliding and turning, was simple in control and facile in practice. Based on Frenet frame, the linear time-variable error equations of parafoil system were built.

基于Frenet坐标系推导和建立了翼伞系统线性时不变的误差方程，并运用&投影点&的思想来获得Frenet坐标系下偏差量的解析近似表达式，从而设计了用于翼伞系统航迹跟踪的传统PD控制器和增益调节型模糊PD控制器。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。