一种再入飞行器结构的热流载荷反演方法

提出了一种基于共轭梯度法的再入飞行器热流载荷反演方法.以一维结构为例验证反演方法的有效性,并分析了材料温变热物性参数和传感器测量误差对反演精度的影响;进而针对热防护结构和返回舱结构开展了热流载荷反演分析.结果表明:本文方法能有效地反演热防护结构和返回舱结构的热流载荷;考虑材料的温变热物性参数会使得反演过程存在非线性因素...

A Heat Flux Identification Method for Reentry Vehicle Structures

Based on the conjugate gradient method (CGM), a heat flux identification method for reentry vehicle structures is proposed. A one dimensional structure is firstly adopted as the research object to verify the effectiveness of the proposed heat flux identification method. The influences of both the temperature dependent thermal properties of the material and the measurement error of the sensors on the identification accuracy are analyzed. Then, the heat flux identification analysis for the thermal protection structure and complex reentry capsule is presented. Research results indicate that the proposed method could effectively identify the heat flux of thermal protection structure and reentry capsule structure. When the nonlinearity caused by the thermophysical parameters of the material is considered in the identification process, the accuracy of the identified results could be improved by updating the sensitivity during the calculation. When the sensor has a large measurement error, by using the noise reduction method and the convergence criteria, the over fitting phenomenon can be solved, and the identification accuracy can be improved.