移动性边界条件传热过程多模型自适应反演

The heat transfer process of moving boundary conditions (including moving heat source and moving phase change interface) is widely existed in many engineering technology fields. The research on inverse problem for such heat transfer process is the urgent demand of engineering practice. Time-varying uncertainty and nonlinear are the intrinsic characteristics of the heat transfer process of moving boundary conditions, and the theory support that the existing research programs of inverse heat conduction problems can provide is obviously insufficient for inverse problem of such systems. For the basic characteristics of such heat transfer process, this project proposes a new idea that the multiple model adaptive theory is applied to study its inversion problem, and carries out the research on several key problems among the process. The basic structure of the multiple model adaptive inversion system is established for heat transfer process of moving boundary conditions. The project puts forward decomposition mechanism and synthesis mechanism of local inversion unit for the heat transfer system of moving boundary conditions of multiple model adaptive inversion, and explores the inverse method of time-space distribution heating boundary conditions and the design method of local inversion unit for local heat transfer system. By the above research, the multiple model adaptive inversion program is formed for heat transfer process of moving boundary conditions, and the system’s part observable information is utilized to inverse the transient spatial distribution of heat source for heat transfer process of moving boundary conditions or reconstruct the time-space evolution state of the system’s phase change interface, which provides necessary scientific support for the related technical field.

移动性边界条件(包括移动热源和移动相界面)传热过程广泛存在于工程技术领域。研究此类传热过程反问题是工程实际的迫切需求。时变不确定性和非线性是移动性边界条件传热过程的固有特征，现有的反问题研究方案对于此类传热系统反问题能够提供的理论支撑明显不足。针对此类传热过程的基本特征，本项目提出运用多模型自适应理论研究其反演问题的新思路，并对其中的几个关键性问题开展研究，建立移动性边界条件传热过程多模型自适应反演系统的基本结构，提出面向多模型自适应反演的移动性边界条件传热系统分解机制和局部反演单元的合成机制，探索针对局部传热系统的时空分布热边界条件反演方法和局部反演单元的设计方法。通过上述研究，形成移动性边界条件传热过程多模型自适应反演方案，根据系统的部分可观测信息，反演移动性边界条件传热过程热源加载区域的瞬态热负荷分布或重构系统相变界面的时空演进状态，为相关技术领域提供必要的科学支持。

移动性边界条件(包括移动热源和移动相界面等)传热过程，广泛存在于航空航天、激光加工、生物医学、冶金、定向凝固、相变蓄热等重要工程技术领域。研究此类传热过程反问题是工程实际的迫切需求。时变不确定性和非线性是此类传热过程的固有特征，现有的反演方案对于此类传热反问题的理论支撑明显不足。.本项目重点研究了移动性边界条件传热反演面临的几个关键性科学问题。运用预测控制和多模型自适应理论，提出了一种多模型自适应反演(multiple model adaptive inverse, MMAI)方案，建立了非线性传热过程多模型自适应反演系统的基本结构；针对多模型自适应反演系统局部反演单元设计和时空分布热边界条件反演问题，建立了一种具有时空解耦特性的双重分散模糊推理（Double Decentralized Fuzzy Inference, DDFI）反演方法，基于有限测量信息成功地实现了瞬态分布热边界条件的实时反演，并明显提高了反演过程的抗不适定性；建立了一种基于多模型的间接辨识(multiple model indirect identification MMII)方法，为特征量不可观测的非线性传热过程提供了一种有效的反演方案；构造了基于传热反问题的设备内部缺陷三维定量识别系统，利用试件表面局部温度信息实现设备内部缺陷的定量识别。.在前述工作基础上，研究了几类典型移动性边界条件等非线性传热过程的反演及应用问题。主要包括：热防护材料烧蚀边界热流时空分布反演及烧蚀相变界面时空演进状态重构；激光加工等移动热源传热过程反问题及温度场重构；锅炉膜式水冷壁辐射热流密度、水冷壁管内流体温度和对流换热系数的同时反演；基于传热学反问题的复合材料CNG车载气瓶内部缺陷定量检测；半透明介质辐射传热反问题及二维辐射腔体几何形状优化设计。项目所开展的工作，为具有移动性边界条件等非线性传热过程的反演及应用奠定了必要的理论基础。