变化温度下的超声导波板状结构健康监测  

Ultrasonic Guided Wave Plate-Like Structural Health Monitoring Under Varying Temperature

加关注

作  者:顾建祖[1] 陈榕 Rahim Gorgin GU Jianzu;CHEN Rong;RAHIM Gorgin(Faculty of Civil Engineering & Mechanics,Jiangsu University,Zhenjiang 212013,China)

机构地区:[1]江苏大学土木工程与力学学院,江苏镇江212013

出  处:《河南科技大学学报:自然科学版》2019年第2期57-63,108,109共9页Journal of Henan University of Science And Technology:Natural Science

基  金:国家自然科学基金国际重点合作项目(11520101001)

摘  要:超声导波结构健康监测技术在板状构件的缺陷诊断中易受温度干扰,影响阵列对损伤成像的精度。在不同温度下进行兰姆(Lamb)波损伤检测的实验,基于最优基线法(OBS)和基线信号拉伸法(BSS),引入了局部时移,对时域信号进行精确补偿。通过最优基线法筛选出参考信号,添加局部时移实现各波包上的时间补偿,通过基线拉伸完成温度补偿。改进后的温度补偿法能够将温度采集范围由1℃拓宽至10℃,且能够对信号上各波包进行温度补偿。结合椭圆定位法,确保在变化温度下成像的相对误差低于9%。通过实验验证了优化后的温度补偿法的有效性,能够准确识别环境温度变化下的结构损伤。The ultrasonic guided wave structure health monitoring technique was easy to be affected by temperature interference in the defect diagnosis of plate structure,which affected the accuracy of array damage imaging.In order to overcome the effect of temperature change on damage detection,based on optimal baseline selection(OBS)and baseline signal stretch(BSS),the improved method was proposed.The reference signal was screened by OBS,then the time shift was added to each wave packet,and the temperature compensation was completed by BSS.The improved method widened the temperature acquisition range from1℃to10℃,and compensated each wave packet on the signal by time shift.Combined with the ellipse algorithm method,the relative error of imaging was less than9%at the varying temperature.The experimental results show that the improved method is effective and accurately identifies the structural damage under ambient temperature change.

关 键 词:超声导波 结构健康监测 温度补偿 椭圆定位法 

分 类 号:O346.5[理学—固体力学;理学—力学] O347.4

 

参考文献:

正在载入数据...

 

二级参考文献:

正在载入数据...

 

耦合文献:

正在载入数据...

 

引证文献:

正在载入数据...

 

二级引证文献:

正在载入数据...

 

同被引文献:

正在载入数据...

 

相关期刊文献:

正在载入数据...

相关的主题
相关的作者对象
相关的机构对象