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直升机纵向长周期模态是直升机前飞状态下的固有飞行模态,是指直升机受到扰动后呈现出的速度和迎角的周期振荡运动,在相关的飞行品质规范中对该模态有明确的指标要求,是新型直升机调整试飞和设计定型试飞中必须要进行的试飞科目之一。然而有关该模态的相关背景信息却鲜为人知。文章首先给出了该模态的规范要求,然后通过该模态的由来对相关规范要求的背景进行了分析,最后通过这些背景分析,给出了两种不同的试飞方法、数据处理方法和相关的注意事项。
Longitudinal long-term mode of helicopter is the inherent flight mode of helicopter in pre-flight state. It refers to the periodic oscillating motion of helicopter’s speed and angle-of-attack after perturbed, which is clear in the related flight quality specification It is one of the flight test subjects that must be carried out in the new helicopter to adjust flight test and design test flight. However, little is known about the background information about this modality. The article first gives the specification requirements of the modal, and then analyzes the background of the relevant normative requirements through the origin of the modal. Finally, through these background analyzes, gives two different flight test methods, data processing methods and related Precautions.