In Chapter 3, based upon the blade second-order lifting-line model and rotor free-wake model, an analytical method is developed for predicting the rotor wake structure and BVI airload.

基于桨叶二阶升力线理论和旋翼自由模型，本文在第三章建立了一个适合于直升机旋翼构及桨-干扰气分析的方法和模型。

Except the centralized load impressed from plane other components and airload, the plane gun bay structure is also endured the wallop of the navigate gun launching.

在飞机飞行过程中，炮舱构除承受飞机其它零部件传递的集中载荷和空气气载荷外，还要承受航炮发射时的冲击力，整个构始终处于不规则的振状态。