Non-probabilistic uncertainty analysis and optimization design method of multilayer thermal protection system based on experimental design

Abstract

The invention discloses a non-probabilistic uncertainty analysis and optimization design method of a multilayer thermal protection system based on experimental design. The method comprises the following steps that (1) a thermal conductivity coefficient, density and specific heat capacity are selected as uncertain parameters to achieve an interval expression of each uncertain parameter; (2) thickness of each layer and the uncertain parameters are extracted as characteristic parameters to achieve fully parametric modeling, analyzing and solving; (3) a correlation of the uncertain parameters is considered, a random sampling method of correlation factors is put forward, and test samples are selected; (4) an approximate model is constructed according to the samples, influence of uncertain parameters on response is analyzed, optimization selection is carried out, and an uncertainty analysis method of a multilayer structure temperature field is established; (5) the thickness of each layer is taken as a design variable, the constraint condition is that temperature of each layer is smaller than an allowable value, quality minimization is taken as a target function, an optimization model is constructed, and the optimization design of the multilayer thermal protection system is achieved. According to the non-probabilistic uncertainty analysis and optimization design method of the multilayer thermal protection system based on the experimental design, and through efficient uncertainty analysis and optimization, the efficiency of a thermal protection system structure is improved.

Description

technical field [0001] The invention relates to the field of optimal design of a multi-layer thermal protection system, in particular to a method for non-probability uncertainty analysis and optimal design of a multi-layer thermal protection system based on test design. Background technique [0002] Due to the advantages of fast flight speed, short reaction time, large combat radius, good concealment, and strong defense penetration capabilities, hypersonic vehicles have a prominent position in the future war space and God's battlefield, and have become the world's major powers in the arms race. commanding heights. Hypersonic vehicles have been in service for a long time in the extreme environment of multi-field coupling dominated by aerodynamic heat and force, and thermal protection technology has become a bottleneck that directly restricts its development. In order to ensure the safety of pilots and the normal operation of airborne equipment, it is necessary to lay a large...

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Problems solved by technology

However, the heat transfer and heat storage efficiencies of each layer structure are different and the layers are coupled with each other. It is difficult to distinguish the influence of the thermophysical parameters of each material on the temperature field response, which makes the uncertainty analysis of the multilayer thermal protection structure more difficult.

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