Dynamics high-precision simulation method for wide-envelope and strong-maneuver aircraft

Abstract

The invention discloses a dynamics high-precision simulation method for a wide-envelope and strong-maneuver aircraft and belongs to the field of aircraft dynamics and control. According to the method, a rigid body elastic coupling dynamics high-order model of the wide-envelope and strong-maneuver aircraft is established. According to a modeling process, only small amplitude linear vibration assumption is taken into consideration; remarkable and quick time-varying aerodynamic force and torque, engine thrust and torque, gravity, attitude strong maneuver, and a mutual coupling influence between aerodynamic rudder quick motion and structure elastic vibration in the wide-envelope and strong-maneuver flight process of the aircraft are taken into full consideration; and the model comprises comprehensive high-order nonlinear terms, coupling influence items between rigid body motion and elastic vibration, and influence items of attitude maneuver and the aerodynamic rudder quick motion on the elastic vibration and attitudes. According to the high-order model, the real state of the wide-envelope and strong-maneuver aircraft can be truly reflected; through utilization of the high-order model for simulation analysis, the design reasonability of the aircraft can be verified; and the verification result is more accurate and reliable than that of a traditional model.

Description

technical field [0001] The invention relates to a high-precision dynamics simulation method for a large-envelope strong maneuvering aircraft, belonging to the field of aircraft dynamics and control. Background technique [0002] It is a key means to verify the rationality of aircraft design from the perspective of dynamics by using the rigid-body-elastic coupling dynamic model of the aircraft for simulation to obtain the relationship curves of the aircraft's position, velocity, attitude, angular velocity, and elastic vibration mode coordinates with time. If the attitude or elastic vibration curve diverges, the design is not reasonable. [0003] With the rapid development of aerospace technology, new high-performance aircraft have increasingly become the focus of aerospace powers and countries. Large envelope, strong maneuverability, and hypersonic flight have become typical features of new high-performance aircraft, which are significantly different from traditional missile...

AI Technical Summary

Problems solved by technology

Moreover, most of the new aircraft are plane-symmetric shapes, and the lateral and yaw dynamic coupling is serious.

In the case of aerodynamic moment, environmental disturbance moment, violent movement of the aircraft body and aerodynamic rudder, and serious lateral and yaw coupling, the coupling characteristics between the rigid body motion and elastic vibration of the aircraft are complex and strong, and the traditional rigid body elastic coupling dynamic model has not fully considered The influence of the above factors is no longer fully applicable to the characteristics and design requirements of the new type of large-envelope strong maneuvering aircraft

Using the traditional rigid body elastic coupling dynamic model for simulation, the results obtained cannot reflect the real state of the aircraft, and it is difficult to accurately evaluate the rationality of the aircraft design

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