基于小波分解的热波相位特征提取及喷涂层厚度评价

发布时间：2018-02-02 07:26

本文关键词： 热障涂层厚度红外热波检测相位特征小波分解　出处：《红外与激光工程》2017年09期 　论文类型：期刊论文

【摘要】：针对热障涂层制备过程中的厚度评估问题,通过数值模拟手段研究了光脉冲激励下制备在镍基高温合金上不同厚度的Ni Cr Al Y涂层表面热波瞬态响应规律;在此基础上分析了表面热波相位特征随涂层厚度的变化规律,结果表明特定频率范围的热波相位特征与涂层厚度具有近似线性对应关系,但不同涂层厚度之间的相位差绝对值较小,不利于厚度定量评价;为提高不同厚度涂层之间的热波相位差,提出采用小波分解第二层细节系数对涂层表面热波进行重构,重构热波相位差比原始热波提高了约500倍,有利于提高涂层厚度评价的准确率;最后采用试验手段验证了模拟结果的准确性。
[Abstract]:The thickness evaluation of thermal barrier coatings is discussed. The thermal wave transient response of Ni Cr Al Y coating with different thickness prepared under light pulse excitation was studied by numerical simulation. On this basis, the variation of surface thermal wave phase characteristics with the coating thickness is analyzed. The results show that the thermal wave phase characteristics in a specific frequency range have an approximate linear relationship with the coating thickness. However, the absolute value of phase difference between different coating thickness is small, which is not conducive to quantitative evaluation of thickness. In order to improve the thermal wave phase difference between coatings with different thickness, the second layer detail coefficient of wavelet decomposition is used to reconstruct the thermal wave on the surface of the coating. The phase difference of the reconstructed thermal wave is about 500 times higher than that of the original thermal wave. It is helpful to improve the accuracy of coating thickness evaluation. Finally, the accuracy of the simulation results is verified by means of experiments.
【作者单位】：装甲兵工程学院再制造技术重点实验室;
【基金】：国家自然科学基金(51675532,51535011)
【分类号】：TG174.4
【正文快照】： 0引言热喷涂涂层广泛应用于工程结构和装备零件表面防护领域,如高温涡轮叶片表面的热障涂层、轴类零件表面的耐磨涂层、舰船和潜艇表面的防腐涂层等,这些涂层发挥着防腐、耐磨、隔热等作用,延长了结构和零件的使用寿命。涂层厚度是热喷涂涂层的重要性能参数,厚度的变化对涂层

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