A method for evaluating the upper and lower bounds of uncertain aerodynamic loads of aircraft based on high-order interval perturbation theory

Abstract

The invention discloses an aircraft uncertain aerodynamic load upper and lower boundary assessment method based on the high-order interval perturbation theory. The method includes the steps that in consideration of uncertainty in the manufacturing and flying processes of an aircraft, uncertain parameters are quantitatively represented with interval vectors first, a subsonic velocity steady aerodynamic force model including the interval uncertain parameters is established through the vortex-lattice method for a two-dimensional rigid wing, a calculation expression of the lift coefficient can be obtained through calculation based on the Taylor series expansion and high-order perturbation theory, the mid-value and radius of a lift coefficient response interval can be obtained based on the Neumann series expansion and high-order perturbation theory, and the upper boundary and lower boundary of the lift coefficient can be obtained based on the interval computation rule. By means of the method, the boundaries of an uncertain aerodynamic load response can be obtained, and objective and effective data is provided for structural aerodynamic configuration design and flying state control of the aircraft.

Description

technical field [0001] The invention relates to the technical field of aircraft aerodynamic load estimation, in particular to a method for evaluating the upper and lower bounds of uncertain aerodynamic loads of aircraft based on high-order interval perturbation theory. Background technique [0002] During the design and use of the aircraft, there are many uncertain factors such as its own parameters and the use environment, such as the velocity and direction of the incoming flow, the viscosity of the air, the Mach number of the incoming flow, the size of the structural processing, etc. These uncertain factors lead to fluctuations in the performance of the aircraft. It will seriously affect the performance stability and flight safety of the aircraft. Therefore, in the stage of aircraft design, it is particularly important to pay attention to the influence of uncertain factors on aircraft performance. Numerical simulation is an important means to guide the design of aircraft....

AI Technical Summary

Problems solved by technology

At present, the research on uncertain aerodynamics is limited to random methods, and obtaining the random distribution of parameters requires a large amount of sample data, which is often impossible to achieve in engineering

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