超声测量结构内部瞬态温度场的重建方法研究  

Research on parameter estimation in ultrasonic measurement of internal transient temperature distributions

作　　者：石友安[1,2] 魏东[2] 桂业伟[2] 钱炜祺[2] 曾磊[2] 邱波[2] 

机构地区：[1]中国空气动力研究与发展中心空气动力学国家重点实验室,绵阳621000 [2]中国空气动力研究与发展中心计算空气动力学研究所,绵阳621000

出　　处：《中国科学：技术科学》2016年第5期509-517,共9页Scientia Sinica(Technologica)

基　　金：国家自然科学基金(批准号:11402285;11372338;51308531);空气动力学国家重点实验室研究基金;国家重点基础研究发展计划(编号:2015CB755800)资助项目

摘　　要：固体结构内部瞬态温度场的无损测量在航空航天、机械制造与材料加工等领域都具有十分重要的作用.本文基于超声波传播速度与温度的相关性,建立了超声测量各向同性材料内部瞬态温度分布的模型,从反演角度入手,将瞬态非均匀温度场的重建问题转化为热边界的反演和热传导正问题计算的问题,应用参数辨识中的共轭梯度法,发展了一种高分辨率的温度场重建方法,并通过数值仿真系统分析算法的精度、抗噪性和稳定性等特性,最后,进行了实验验证与分析.研究表明:基于超声渡越时间反演得到的热边界条件,符合物理实际,重建得到的结构内部瞬态温度分布精度较高、实时性好、适用性强,有利于促进超声无损测温技术的发展,具有重要的工程应用价值.A new reconstruction method of internal unsteady temperature distributions in solid structure using ultrasonic thermometry technique is presented in this paper. This method mainly consists of a joint of heat condution caculation and an inverse analysis for boundary parameter estimation using ultrasonic time of flight by Conjugate Gradient method. The principle for internal temperature sensing is based on temperature dependence of the velocity of the ultrasonic wave that propagates through solid material. Simulation and stability analysis are made in which classic function form of heat flux is estimated to illustrate accuracy, as well as factors of influencing quality of this reconstruction method. Validation experiments with a steel plate whose single side is heated by a heater and then cooled down by water are refered. It is verified that the temperature gradient and its variation estimated by this method agree well with the measured values using thermocouples installed in the steel. The results demonstrate that the method presented in this work is a promising means for high accurate rebuilding internal unsteady temperature distributions in solid structure.

关 键 词：超声测温 温度场重建 边界反演 共轭梯度法 实验验证 

分 类 号：TB559[理学—物理]