Probability technology based thermal protection system design method

Abstract

The invention discloses a probability technology based thermal protection system design method. The probability technology based thermal protection system design method comprises the steps of firstly building a parameterized model of a thermal protection system in consideration of random distribution of thermal random variables; then generating various random input samples by utilizing an efficient sampling technology; then carrying out transient thermal analysis on samples in probability analysis and regarding a temperature characteristic quantity at one position and at one moment of the thermal protection system in a flying process as an output variable; then building a polynomial response surface model on the basis of a small amount of existing samples; and finally, carrying out Monte Carlo direct sampling on the response surface model to obtain probability distribution of the temperature characteristic quantity of the thermal protection system. According to the probability technology based thermal protection system design method, probability design of the thermal protection system is realized, a system reliability index and input random variable sensitivity are obtained, and a direction for scheme design and optimization of the thermal protection system is provided. In addition, the calculation efficiency is greatly improved through combination of the efficient sampling technology and a numerical integration algorithm; and the method engineering provided by the invention is available.

Description

technical field [0001] The invention relates to a thermal protection design method based on probability technology, and belongs to the related field of hypersonic thermal protection design. Background technique [0002] The thermal protection system (Thermal Protection System, TPS) is one of the most important systems of a hypersonic vehicle, which protects the structural integrity of the system and the temperature conditions inside the vehicle in the high temperature and harsh environment of the aerodynamic heating of the vehicle. The reliability and structural integrity of the thermal protection system are crucial to the safety of the aircraft. The accidents caused by its failure account for a considerable proportion of aerospace / aircraft mission failures. Therefore, thermal protection technology is the most critical link in the design of Gaochao aircraft. [0003] In the design process of the thermal protection system, the most critical issue is to reasonably determine th...

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Problems solved by technology

However, there are many uncertainties in the design input conditions of the thermal protection system, such as flight trajectory deviation, analysis model error, data measurement error, material property dispersion, system processing and assembly deviation, external load environment, etc. These uncertain parameters and their distribution Can lead to uncertainty in thermal protection design results

In the traditional deterministic thermal protection system design method, the adverse effects of uncertainties in the design process are considered by setting safety factors. The design results obtained by this method are often too conservative, resulting in excessive weight of the system, and in some cases In addition, because the sensitivity of system performance to design parameters or uncertain parameters is not considered, the system reliability is reduced

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