Hypersonic aircraft aerodynamic load optimization design method based on proxy model

Abstract

The invention discloses a hypersonic aircraft aerodynamic load optimization design method based on a proxy model. The method comprises the steps that a simple agent model mathematical expression is used for replacing corresponding relations between response of parameterized modeling control parameters of a hypersonic aircraft forebody compression surface and an air inlet duct protection cover and response of a forebody compression surface aerodynamic load peak value, a lift-drag ratio, a moment of force at the joint of the protection cover and a projectile body, air inlet flow and a total pressure recovery coefficient; and performing efficient optimization design of the aerodynamic load of the hypersonic aircraft. The method comprises the following steps: firstly, determining the sensitivity of each design variable to each response, screening to obtain part of design variables, generating sample points in the value range of the design variables, further calculating to obtain a response value corresponding to each sample point, respectively constructing proxy models of the responses, and carrying out aerodynamic load optimization based on the constructed proxy models after the precision verification meets the requirements. According to the invention, the calculation efficiency is greatly improved while the flight load is effectively reduced, and a feasible technical thought can be provided for advanced design of the hypersonic flight vehicle.

Description

technical field [0001] The present invention relates to the field of aerodynamic load design of hypersonic aircraft, in particular to an aerodynamic load optimization design method based on a proxy model, in order to break through the limitation of low efficiency of CFD calculation time in the traditional aerodynamic load optimization process of hypersonic aircraft, thereby improving The design level of hypersonic aircraft. Background technique [0002] Hypersonic aircraft generally refers to aircraft with a flight speed exceeding 5 times the speed of sound. It has the characteristics of fast flight speed, large combat radius, good concealment performance, and strong defense penetration capabilities. It has become an extremely important development direction for the weapons and equipment of military powers in various countries. Among them, compared with rocket engine-powered hypersonic vehicles, hypersonic vehicles using air-breathing ramjet engines can be reused, and use o...

AI Technical Summary

Problems solved by technology

Due to the complex shape of the precursor, the number of aerodynamic grids of the aircraft is often large, often millions or even tens of millions. Using Fluent to carry out CFD calculations takes a long time, and the optimization iteration process requires hundreds of calculations. Computationally inefficient and costly

Images