Unmanned aerial vehicle flexible flight dynamics analysis method considering complex wind field

Abstract

The invention discloses an unmanned aerial vehicle flexible flight dynamics analysis method considering a complex wind field. The method comprises the following steps: establishing an unmanned aerial vehicle flight kinetic equation by using an average shafting theory; carrying out trimming linearization on the equation under the hypothesis of small disturbance, and establishing a wing elastic motion equation under modal coordinates based on a modal truncation method; utilizing a second-order system to simulate the reaction process of a steering engine to convert a transfer function of a steering engine model into a state space form, so that a flight dynamics model, an atmosphere model and the steering engine model in the state space form are coupled to obtain the gust response of the unmanned aerial vehicle.

Description

technical field [0001] The invention belongs to the technical field of unmanned aerial vehicles, and in particular relates to a flexible flight dynamics analysis method for unmanned aerial vehicles considering complex wind fields, which can be used for research on the flexible flight dynamics analysis methods for unmanned aerial vehicles considering complex wind fields. Background technique [0002] Unmanned aerial vehicle (UAV) is an indispensable and important weapon in modern high-tech warfare. It is a powerful tool for winning wars and carrying out major tasks. In civilian fields such as disaster monitoring and emergency response, and earth remote sensing, drones are playing an important role. In recent years, large-aspect-ratio long-range UAVs and new energy ultra-long-endurance UAVs have become research hotspots. When UAVs fly in the air, especially when passing through complex terrain environments such as mountains or in environments with harsh weather conditions, th...

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Problems solved by technology

Due to the large wingspan of ultra-long-endurance drones, a large number of lightweight structures need to be used. This type of design leads to a sharp increase in the flexibility of the aircraft, which is prone to rigid and elastic coupling, resulting in structural damage or stalling. Not only In this way, when the natural frequency of the UAV flexible structure is very low, the rigid motion will lead to an unstable motion mode or a lower free vibration velocity of the rigid body, which will have an adverse effect on the scheme design

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