A Design Method for the Approach and Landing Trajectory of Unpowered Aircraft

Abstract

The invention discloses a design method for an approach landing track of an unpowered aircraft. When the flareout landing track is designed, assumed that the height of a flareout landing initial point is known, then, expressions of all track parameters are derived according to a geometrical relationship, and the flareout landing track is designed. In order to design the ideal flareout landing track, the proper height of the flareout landing initial point is found out through an optimization algorithm, track deduction is conducted along the landing track, and therefore the grounding dynamic pressure becomes the ideal grounding dynamic pressure. A deep glide landing track and the ideal flareout landing track form the optimal approach landing track. According to the design method, the aerodynamic force and the aerodynamic moment borne by the aircraft are taken into consideration, and the influences on the design of the landing track of aerodynamic data of deflecting of an aerodynamic control plane and putting of an undercarriage are also taken into consideration. The design method for the approach landing track is simple in principle, computer software is adopted for conducting optimization design, and the design efficiency is improved.

Description

technical field [0001] The invention belongs to the field of aircraft flight control, and in particular refers to an optimal design method for an approach and landing trajectory of an unpowered aircraft. Background technique [0002] The landing control technology of unpowered aircraft is a key technology in the aerospace and aviation fields. In the field of spaceflight, the flight process of the space shuttle and future aerospace planes returning to the earth from orbital flight is an unpowered flight process. In the field of aviation, the flight process in which a manned or unmanned aircraft loses power due to engine failure is also a non-powered flight process. How to ensure that the aircraft can land safely without power is an important research topic in the field of flight control. [0003] For unpowered aircraft, the approach and landing process is the most complicated link. In this process, under the action of the flight control system, the aircraft needs to accura...

AI Technical Summary

Problems solved by technology

American scholars Gregg and Steven conducted research on the landing trajectory design of the X-34, but they did not consider the aerodynamic moment on the aircraft when designing the landing trajectory for the deep glide section, and did not consider the landing trajectory for the flattening section. The impact of each aerodynamic rudder surface on the landing trajectory, and in the entire landing trajectory design process, the impact of the landing gear lowering process on the landing trajectory was not considered

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