激光超声信号与裂纹能量作用机理研究
发布时间：2018-12-18 15:52
【摘要】：近几年兴起的激光超声检测技术,在对微裂纹检测方面以其非接触、宽频带等优点受到广泛关注,取得一定进展,但是目前并没有统一的理论解释裂纹和超声信号作用机理。从能量角度分析研究发现,裂纹的存在会消耗超声波的能量,造成能量衰减,同时理论计算与实际值之间存在比例系数。通过能量衰减计算公式,设计并进行实验,利用波形幅值的平方近似代替波形能量,通过两者对比,对比例系数进行拟合,然后计算出未知裂纹深度的比例系数,并由此反推预判未知深度裂纹对应的能量衰减值,实现对裂纹定量检测的目的。
[Abstract]:In recent years, the laser ultrasonic detection technology has been paid more and more attention for its advantages of non-contact and broadband, but there is no unified theory to explain the mechanism of crack and ultrasonic signal. From the point of view of energy analysis, it is found that the existence of crack will consume the energy of ultrasonic wave, resulting in energy attenuation. At the same time, there is a proportional coefficient between the theoretical calculation and the actual value. The formula of energy attenuation is used to design and carry out experiments. The square approximation of waveform amplitude is used to replace the wave energy. Through the comparison of the two, the proportional coefficient is fitted, and then the proportional coefficient of unknown crack depth is calculated. The energy attenuation corresponding to the crack with unknown depth is predicted and the purpose of quantitative crack detection is achieved.
【作者单位】： 中北大学机电工程学院;中北大学计算机与控制工程学院;电子测量技术国家重点实验室;
【基金】：教育部博士点基金联合资助项目(项目编号:2013142012007)
【分类号】：TN249
本文编号：2386074
[Abstract]:In recent years, the laser ultrasonic detection technology has been paid more and more attention for its advantages of non-contact and broadband, but there is no unified theory to explain the mechanism of crack and ultrasonic signal. From the point of view of energy analysis, it is found that the existence of crack will consume the energy of ultrasonic wave, resulting in energy attenuation. At the same time, there is a proportional coefficient between the theoretical calculation and the actual value. The formula of energy attenuation is used to design and carry out experiments. The square approximation of waveform amplitude is used to replace the wave energy. Through the comparison of the two, the proportional coefficient is fitted, and then the proportional coefficient of unknown crack depth is calculated. The energy attenuation corresponding to the crack with unknown depth is predicted and the purpose of quantitative crack detection is achieved.
【作者单位】： 中北大学机电工程学院;中北大学计算机与控制工程学院;电子测量技术国家重点实验室;
【基金】：教育部博士点基金联合资助项目(项目编号:2013142012007)
【分类号】：TN249
【相似文献】
相关期刊论文 前2条
1 赵宏鹏;刘艳芳;梁巍巍;殷瑞光;李波;;高精度连续动态激光能量衰减装置设计及其标定方法[J];红外与激光工程;2013年S1期
2 段书超;;Hall效应对MHD湍流的能量衰减的影响[J];核聚变与等离子体物理;2009年02期
，本文编号：2386074
本文链接：https://www.wllwen.com/kejilunwen/dianzigongchenglunwen/2386074.html
