Question

论文英文摘要怎么写

非稳态法已成为测定材料热物性的主要手段，非稳态平面热源法具有测试时间短、可同时获得多个热物性参数等突出特点。本文就非稳态平面热源法测隔热材料热导率开展了理论分析和测试技术研究。
本文推导了非稳态平面热源法理想测试模型，对热参数进行灵敏度分析，根据参数的灵敏度大小确定其估计的可能性，根据理论模型计算出物性参数理论值，以检验用改进高斯方法进行参数估计的可行性和准确性。灵敏度分析表明由热源表面温升曲线可确定的材料蓄热系数，试样内部点温升曲线可同时估计导热系数和热扩散系数。
开展三维仿真模拟，验证了系统满足一维传热假设，被测试样在z方向满足半无限大的假设，并且对初始温度非均匀性和环境温度升高分别作了ansys数值模拟，并且模拟结果用参数估计的方法得出导热系数与理论模型做比较，由此来判断误差。
制定了隔热材料非稳态平面热源法热导率测试技术标准，包括方法原理、装置、加热功率的选取，试样尺寸设计和有效测试时间。

Answer 1

Non steady state method for determination of thermal properties of materials has become the main means, transient plane heat source method has short test time, can obtain a plurality of thermal parameters and other prominent features. In this paper, transient plane heat source method for measuring thermal conductivity of insulation materials carries out the theoretical analysis and testing technology research.This paper derives the transient plane heat source method for ideal test model of thermal parameters, sensitivity analysis, according to the parameters of sensitivity to determine their estimates of the likelihood of, according to the theoretical model to calculate the physical parameters of the theoretical value, in order to test the improved Gauss method to estimate the parameters of the feasibility and accuracy of. Sensitivity analysis shows that by the heating surface temperature rise curve can be determined by the material heat storage coefficient, temperature rise curve within the specimen can be estimated at the same time heat conduction coefficient and thermal diffusion coefficient.Carry out 3D simulation, verified the system satisfies the one-dimensional heat transfer hypothesis, the test sample in the Z direction to meet the semi-infinite hypothesis, and the initial temperature non uniformity and environmental temperature were made by ANSYS numerical simulation, and the simulation results by the method of parameter estimation of thermal conductivity and the obtained theoretical model comparison, thereby to judge error.Developed insulation material Transient plane heat source method for thermal conductivity test technology standards, including the method principle, device, selection of heating power, sample size design and effective testing time.