摘要
目的分析非稳态导热反问题在现场快速辨识建筑围护结构的导热系数和体积热容的算法.方法利用参数辨识算法,计算了内部圆柱面在常热流情况下,材料的热物性参数,给出了相关的数值验证,对温度获取时可能产生的随机和系统误差进行探讨.结果若获取的温度为真值,该算法辨识的导热系数和体积热容的值与真值的误差分别为0.11%和0.16%;若考虑温度的随机误差和系统误差,随着优化函数J减小,k和C的辨别结果却先收敛后发散.结论利用非稳态导热反问题的原理辨识建筑围护结构的导热系数和体积热容是可行的;本算法可行且稳定;参数辨识对误差较为敏感。
An algorithm, using an unsteady inverse heat conduction method is analyzed to identify instantly the thermal conductivity and volume heat capacity of the building envelope. Using a parameter identification method, a simple identification algorithm of materials thermal parameters, with the model of the constant heat flux in the inner cylinder, is analyzed, and relevant numerical proofs are presented as well. In the mean time, the random and system errors during obtaining temperatures are discussed. If the obtained temperatures are true values, the relative errors between identified values and true values of thermal conductivity and volume heat capacity are respectively 0.11% and 0.16%. If the random and system errors of the temperature are taken into consideration, with reducing of the optimization function J, the identified results of k and C are convergence before divergence. While compared with the identified results of the initial value with rectangular random error, the relative errors with system error are separately larger nearly 17 % and 22 %, which shows that such problems are more sensitive to the error.
出处
《沈阳建筑大学学报（自然科学版）》
CAS
2008年第1期115-118,共4页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(50676018)
关键词
导热
反问题
非稳态
辨识
导热系数
体积热容
heat conduction
inverse problem
unsteady
identification
thermal properties
