尿素合成塔内衬316LMod不锈钢薄板背侧缺陷的Lamb波检测
Lamb Wave Testing Technique of Backside Defects in 316LMod Stainless Steel Linings of Urea Reactors
摘 要
根据Rayleigh-Lamb方程, 推导出尿素合成塔内衬316LMod不锈钢薄板相速度和群速度的频散曲线。通过对包含人工缺陷的试块回波信号进行二维傅里叶变换, 提取出了背侧裂纹缺陷的主要Lamb波模式, 进而确定了Lamb波检测参数。通过对试块的缺陷识别, 绘制出了缺陷当量评定图, 实现了对背侧裂纹缺陷的Lamb检测的定量评定。最后通过尿素合成塔检测实例验证了该方法的有效性。
不锈钢
频散曲线
背侧缺陷
Lamb wave testing
Stainless steel
Dispersion curves
Backside defect
Abstract
According to Rayleigh-Lamb equation, the dispersion curves of phase and group velocities of 316LMod stainless steel linings were derived out. The main Lamb wave mode of backside defect was drawn out through 2D FFT of echo signal of the sample with artificial defects, then, the Lamb wave testing parameters were confirmed. Through the defect recognition of the sample, the defect equivalent evaluation was given, and then, the quantitative Lamb wave testing of backside defects was realized. Finally, the method was verified by examples of urea reactors testing.
中图分类号 TG115.28
所属栏目 试验研究
基金项目 国家质检总局耐腐蚀高压容器衬里层快速检测技术研究(2008QK178)
收稿日期 2009/7/30
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备注王春茂(1978-), 男, 工程师, 主要从事特种设备检验和研究工作。
引用该论文: WANG Chun-Mao,ZHU Wei-Guo,YUAN Tao,SHEN Xiao-Min. Lamb Wave Testing Technique of Backside Defects in 316LMod Stainless Steel Linings of Urea Reactors[J]. Nondestructive Testing, 2010, 32(5): 370～372
王春茂,祝卫国,袁 涛,申孝民. 尿素合成塔内衬316LMod不锈钢薄板背侧缺陷的Lamb波检测[J]. 无损检测, 2010, 32(5): 370～372
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参考文献
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【4】冯占英, 周正干, 高翌飞.大型薄板中超声导波的产生与鉴别［J］.无损探伤, 2007, 31(5): 1-3.
【2】Cohen L. Time-frequency distributions: a review［J］. Proceedings of the IEEE, 1989, 77(7): 941-981.
【3】Proser W H, Seale M D. Time-frequency analysis of the dispersion ofLamb modes［J］. J Acoust Soc Am, 1999, 105(5): 2669-2676.
【4】冯占英, 周正干, 高翌飞.大型薄板中超声导波的产生与鉴别［J］.无损探伤, 2007, 31(5): 1-3.
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