CAJ | 학술논문

采用超声频谱分析技术对厚度为52 mm的环氧浇注绝缘材料底面下直径为0.8~0.25 mm的铝合金夹杂物进行了定量检测。提取不同损伤状态下底面回波功率谱相对于基准信号的均方差（RMSD）值计算结果作为定量表征指数。结果表明：存在铝合金夹杂时，RMSD的数值随损伤尺寸的减小而减小。借助超声频谱分析技术可以对直径为0.25 mm的铝合金夹杂物进行有效检测。
채용초성빈보분석기술대후도위52 mm적배양요주절연재료저면하직경위0.8~0.25 mm적려합금협잡물진행료정량검측。제취불동손상상태하저면회파공솔보상대우기준신호적균방차（RMSD）치계산결과작위정량표정지수。결과표명：존재려합금협잡시，RMSD적수치수손상척촌적감소이감소。차조초성빈보분석기술가이대직경위0.25 mm적려합금협잡물진행유효검측。
The aluminum inclusions with diameter of 0.8~0.25 mm bonded at the bottom of the epoxy casting insulating material with thickness of 52 mm were tested quantitatively by ultrasonic spectrum anal-ysis technique. The root mean square deviation(RMSD) of the power spectrum of the reflected wave un-der different damage states compared to reference signal was extracted as damage index. The results show that when the aluminum inclusions exist, the RMSD decreases with the decrease of the aluminum inclusion diameter. The ultrasonic spectrum technique can effectively test the aluminum inclusion with the diameter of 0.25 mm.