| 陈文彰,杨茜,解社娟*,朱东彬,胡宁,白雪,陈振茂.涡流无损检测温度影响研究[J].实验力学,2023,38(3):296~306 |
| 涡流无损检测温度影响研究 |
| Research on temperature influence of eddy current nondestructive testing |
| 投稿时间：2022-04-28 修订日期：2022-08-15 |
| DOI：10.7520/1001-4888-22-109 |
| 中文关键词: 增材制造 涡流检测 温漂补偿 信号处理 |
| 英文关键词:additive manufacturing eddy current testing temperature drift compensation signal processing |
| 基金项目:国防173项目; 国家自然科学基金项目(NSAF: U2130206, NSFC: 12222207、 11927801) |
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| 中文摘要: |
| 增材制造是一种先进的金属制备方法，能够极大满足个性化的制造需求。制造过程中由于工艺原因可能会出现裂纹等典型缺陷。涡流无损检测对于增材制造结构件的裂纹缺陷是一种潜在的有效评价手段。在增材制造过程中，构件残余热会影响检测效果，需要开发抑制温度影响的涡流信号处理方法。基于以上背景，本研究开展了以下工作：(1)对涡流检测信号受温度影响的机理进行了详细分析，包括涡流检测信号温漂的影响因素以及这些因素随温度的变化规律。(2)基于数值计算验证了涡流检测信号的温漂规律。(3)搭建了涡流检测实验平台，通过该平台进行实验发现，待测导体温度越高缺陷信号越小。(4)针对自激自检探头信号温漂难题，设计了双探头差动补偿形式，开发了涡流信号间接差分信号处理方法。(5)使用上述差动补偿形式和信号处理方法，达到了减弱涡流信号漂移、提高涡流信号信噪比的目的。 |
| 英文摘要: |
| Additive manufacturing is an advanced metal preparation method that can greatly meet individual manufacturing needs. Typical defects such as cracks may occur during the manufacturing process due to process reasons. Eddy current nondestructive testing is a potentially effective evaluation method for crack defects in additively manufactured structural parts. In the process of additive manufacturing, the residual heat of components will affect the detection effect, and it is necessary to develop an eddy current signal processing method that suppresses the effect of temperature. In view of the above background, this research has carried out the following works: (1) The mechanism of eddy current detection signal affected by temperature was analyzed in detail, including the influencing factors of the temperature drift of the eddy current detection signal and the variation law of these factors with temperature. (2) Based on the numerical calculation, the temperature drift rule of the eddy current detection signal was verified. (3) An eddy current detection experimental platform was built. Through the experiment on this platform, it is found that the higher the temperature of the conductor to be tested, the smaller the defect signal. (4) Aiming at the problem of signal temperature drift of combined transmit receive probe, a dual-probe differential compensation form is designed, and an indirect differential signal processing method for eddy current signals is developed. (5) By using the above-mentioned differential compensation form and signal processing method, so as to reduce the drift of eddy current signals and improve the signal-to-noise ratio of eddy current signals. |
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