基于超声波的结构内部温度场重建方法研究

发布时间：2018-01-28 21:22

  本文关键词： 超声测温 一维稳态温度场 温度场重建 试验验证　出处：《机械工程学报》2017年12期 　论文类型：期刊论文

【摘要】：针对在工业应用中对结构内部温度场无损测量的需求,以超声测温机理和热传导理论为基础,提出一种一维稳态结构内部温度场的重建方法,并且设计一套微秒级超声声时测量的超声测温系统以验证此方法的可行性。根据所提出的结构内部温度场重建方法,分别进行超声声速与温度的标定试验和结构内部一维稳态非均匀温度场的重建试验,测量了结构试样在单边受热过程中的超声声时,构建了结构试样底面在100℃、150℃、200℃加热,上表面15℃水冷情况下的内部温度场分布,并且系统分析冷端边界条件、标定方程、热扩散系数、热膨胀等因素对重建效果的影响。结果表明:本方法能够实现结构内部一维稳态温度场的重建,并且在对于温度梯度明显的区域具有较好的重建精度。
[Abstract]:In order to meet the demand of non-destructive measurement of internal temperature field in industrial application, a method of reconstruction of internal temperature field of one-dimensional steady-state structure is proposed based on the theory of ultrasonic temperature measurement and heat conduction. In order to verify the feasibility of this method, a set of ultrasonic temperature measurement system with microsecond ultrasonic acoustic time was designed to verify the feasibility of the method. According to the proposed method of internal temperature field reconstruction of the structure. The ultrasonic velocity and temperature calibration test and the internal one-dimensional steady nonuniform temperature field reconstruction test were carried out respectively to measure the supersonic sound time of the structure specimen in the process of one-sided heating. The distribution of internal temperature field on the bottom surface of the structural specimen under 100 鈩，

本文编号：1471578