Simulation method for elastic waverider hypersonic flight vehicle

Abstract

The invention provides a simulation method for an elastic waverider hypersonic flight vehicle. The method includes the following steps that considering influences of aerodynamic heating and variable section inertia moment, an elastic model of a hypersonic flight vehicle free beam structure is established; a model superposition method is used for solving an elastic vibration equation, the intrinsic frequency, damping ratio and intrinsic vibration mode of each mode are solved, and on this basis, an elastic vibration generalized coordinate equation of the waverider flight vehicle is obtained; a computational fluid dynamics method is used for obtaining aerodynamic force and engine propulsion of the flight vehicle; on the basis of analyzing thrust, aerodynamic force and aeroelasticity, a rigid body-elastic coupling model of the hypersonic flight vehicle is established. The simulation method is suitable for performing modeling and simulation on the waverider flight vehicle. On this basis, the established model of the waverider hypersonic flight vehicle is more accurate, and the aerodynamic / propelling / elastic coupling characteristics of the flight vehicle can be reflected better in the process of model simulation.

Description

technical field [0001] The invention belongs to the field of aircraft modeling, and in particular relates to a simulation method for a hypersonic aircraft of an elastic waverider, which is a method for modeling and modeling a hypersonic aircraft of a waverider under the condition of considering elastic vibration, moment of inertia of variable section and aerodynamic heating effect. simulation method. Background technique [0002] The air-breathing hypersonic vehicle has the characteristics of directly absorbing oxygen from the atmosphere without carrying oxidants, which can reduce the cost of air transportation and increase the payload. In addition, it has the potential advantages of long-range rapid response, high maneuverability, high probability of survival, and free access to space. At present, the United States and other countries have conducted ground tests or flight tests of air-breathing hypersonic vehicles. Since the 1990s, the formation of waveriders outside the b...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: how to accurately solve the partial differential equation of the elastic vibration of the aircraft under the condition of considering the uneven mass distribution of the aircraft and the aerodynamic heating effect, and on this basis, establish a system that reflects the aerodynamic / propulsion / elastic coupling of the aircraft. Characteristic waverider hypersonic vehicle model

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