针对多层复合材料热物性参数测试方法的研究

RESEARCH ON TESTING METHOD OF THERMOPHYSICAL PROPERTIES OF MULTILAYER COMPOSITES

段淇耀

11749158

硕士

机械工程

祝渊

2019-05-31

2019-06-28

哈尔滨工业大学

深圳

随着技术的发展，多层复合材料由于能综合不同材料优点得到了日益广泛的应用，然目前并无相应的测试参考标准。本文根据目前多层材料热测试领域涌现的需求，针对多层复合材料每一层的热物性参数测试表征开展研究工作，基于结构函数法实现用瞬态法测量多层复合材料热物性参数的目标。论文主要研究内容包括：结构函数算法推导与实现，计算机模拟仿真，测试装置软硬件研究三大部分。结构函数法是一种用于半导体电子封装热阻测量的无损测试方法，其能根据瞬态温度响应曲线推导出积分结构函数与导数形式结构函数，从而表征相应的热阻和热容。结构函数法的理论基础不仅适用于半导体，在材料的热测试中也同样适用；将材料看作是多个热阻、热容串并联组合，即标准的RC 电路叠加，网络分别为FOSTER 网络模型与CAUER 网络模型，两者可以相互转换。已知系统热响应传递函数恒定，于是整个测试过程类似于系统辨识，需要根据系统的输入输出响应函数来确定描述系统行为的数学模型。采用计算机模拟仿真的方式使用RC 串并联电路验证了结构函数法的有效性，并实现了结构函数法的基本功能，编写了多层复合材料测试软件。基于MATLAB 编写的测试软件最终经实际测试，其处理结果与依据ASTM D5470 的稳态测试法结果相近，可以解析出多层复合材料的热结构信息。论文基于结构函数法设计了多层复合材料测试软件，使用导热垫片与PI 薄膜复合多层材料进行实验研究，完成了对多层复合材料热物性参数测试的目标，解析出每一层材料相对应热物性参数及导热能力；针对算法进行了详细推导，就实现过程作出详细介绍，通过仿真与实验验证了算法的可行性并附主要函数具体实现的相关代码；对于实际测试过程中的问题也进行了深入探讨，通过对误差来源分析，增加数据平滑步骤优化了测试算法，提高了测试精度和测试稳定性，增加了鲁棒性，为实际工业应用打下基础。

With the development of technology, multi-layer composites have been widely used in different industries due to the ability of combining the advantages of different materials, but there is no corresponding test reference standard at present. In this paper, a new testing method is proposed for multi-layer materials according to the emerging application scenarios in the industry. The research work on the characterization of thermal physical parameters of multi-layer materials, aiming at realizing and optimizing test algorithm and put it into practice. The main research contents of this paper include: Implementing the algorithm of structure function, Computer simulation and Software and Hardware research of test device. Structural function is a nondestructive testing method for thermal resistance measurement of semiconductor electronic packaging. It can deduce integral structure function and differential structure function, which contain the characterizing of thermal resistance and heat capacity, according to transient temperature response curve. Obviously, structural function is not only applicable to semiconductor, but also to thermal testing of materials. The material is regarded as a series combination of multiple thermal resistances and heat capacities, i.e. the standard RC circuit superposition. The networks are FOSTER network model and CAUER network model respectively, and they can be converted to each other. As we all know that the thermal response transfer function of the system is constant, so the whole testing process is similar to system identification. We need to determine the mathematical model describing the system behavior according to the input and output time function of the system. The basic function of structural function method is realized by computer simulation and the test software is designed based on MATLAB. Finally, the algorithm is optimized with experimental tests to increase its robustness and the results will lay a foundation for the development of practical industrial applications. This paper designed the software based on the structural function method and the experimental platform was set up to verify the feasibility and effectiveness of the program. Besides, the feasibility of the algorithm is verified and the related codes are attached. Through the analysis of uncertainty and error sources, the test algorithm is optimized by IIIadding data smoothing steps, and the test accuracy and test stability are improved.

多层复合材料 瞬态测试 热阻 结构函数

multilayer composite materials transient testing thermal resistance structural function

中文

联合培养

南方科技大学

段淇耀. 针对多层复合材料热物性参数测试方法的研究[D]. 深圳. 哈尔滨工业大学,2019.