Combined Two-Dimensional Parameter and Function Estimation in Heat Transfer

这项研究主要是实验性的，但它利用了先进的 用于确定参数和函数的分析技术， 瞬态测量 两种不同类型的瞬态热 转移实验是要执行，两者都是多- 立体的 第一种类型的实验涉及 同时测定定向导热系数 在纤维-环氧复合材料及其密度比热 产品 第二种类型涉及淬火的加热球， 冷却浴。 这适用于材料的加工 以提高硬度和其它冶金性能。 两 这些实验将使用二维 密歇根州立大学开发的逆向计算机程序; 这些程序包括一个通用的直接热传导 问题解决器，TOPAZ，它是在劳伦斯利弗莫尔开发的 研究实验室。 纤维增强环氧复合材料是一种非常重要的先进材料 材料. 它们具有特殊的性质， 适用于航空航天应用。 之一 特殊的特征是它们的强方向性， 包括导热性。 这项研究是为了利用 先前开发的参数和函数估计技术 在二维实验的分析中， 定向导热系数的测量。 本研究 是很重要的，因为需要导热系数值 在智能固化和加工以及 使用这些材料。 方向相关热 在通常的一维情况下， 实验，因为标本经常被限制在 用于热测试目的。 二维瞬态 实验没有同样的限制。 此外，新 结合分析和实验技术的能力， 在这种试验中开辟新的可能性，包括现场试验， 生物材料和先进的定向材料， 纤维基复合材料和新型超导材料。 一些 还将进行淬火实验。 的各种 实验具有推进组合理论的潜力， 参数和函数估计，因为估计技术 关键取决于测量精度和误差。

The research is primarily experimental but it utilizes advanced analysis techniques for determining parameters and functions from transient measurements. Two different types of transient heat transfer experiments are to be performed and both are multi- dimensional. The first type of experiments involves the simultaneous determination of directional thermal conductivities in a fiber-epoxy composite material and its density-specific heat product. The second type involves quenching of heated spheres in cooling baths. This has application to processing of materials to improve hardness and other metallurgical properties. Both of these experiments are to be analyzed using two-dimensional inverse computer programs developed at Michigan State University; these programs incorporate a general, direct heat conduction problem solver, TOPAZ, which was developed at Lawrence Livermore Research Laboratory. Fiber-filled epoxy composites are very important advanced materials. They have special properties that make them uniquely suited for aerospace and aeronautical applications. One of the special characteristics is their strongly directional properties, including thermal conductivity. This research is to use previously-developed parameter and function estimation techniques in the analysis of two-dimensional experiments for the measurement of directional thermal conductivities. This research is important because the thermal conductivity values are needed in the intelligent curing and processing and the design of components using these materials. Directional-dependent thermal conductivity can be difficult to measure in the usual one-dimensional experiments because the specimens are frequently restricted to being quite thin for thermal testing purposes. Two-dimensional transient experiments do not have the same restrictions. Furthermore the new combined analysis and experimental techniques have the capability to open new possibilities in such tests, including in situ tests, biological materials, and advanced directional materials such as fiber-based composites and the new superconductivity materials. Some quenching experiments are also to be performed. The various experiments have the potential of advancing the theory of combined parameters and function estimation because the estimation techniques depend critically upon the measurement accuracy and errors.