高温合金晶粒尺寸的超声评价方法及检测装置  

Ultrasonic Evaluation Method and Detecting Device for Grain Size of High Temperature Alloy

作　　者：董金龙 陈昊[1,2] 陈曦[2] 邬冠华[2] DONG Jin-long;CHEN Hao;CHEN Xi;WU Guan-hua(School of Information Engineering,Nanchang Hangkong University,Nanchang 330063,China;Key Laboratory of Nondestructive Testing (Ministry of Education),Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学信息工程学院,南昌330063 [2]无损检测技术教育部重点实验室(南昌航空大学),南昌330063

出　　处：《失效分析与预防》2019年第3期147-152,共6页Failure Analysis and Prevention

基　　金：国家自然科学基金(61772255);江西省创新驱动“5511”工程优势学科创新团队(20165BCB19007);江西省优势科技创新团队计划项目(20152BCB24004);无损检测技术教育部重点实验室开放基金(ZD201529004,EW201708505);江西省科技厅科技项目(20161BBG70047,20161BAB202038);江西省高等学校教学改革研究课题(JXJG-16-8-23)

摘　　要：针对超声声速、衰减系数、非线性系数等特征参数表征GH4169晶粒尺寸存在检测误差较大的问题,以指数函数为映射函数,将多个超声特征参数归一化后融合构造出新的特征参数,建立以平均绝对误差最小为优化目标的优化问题,并结合遗传算法进行求解,从而确定最优超声多参数评价模型,开发实时超声检测与晶粒尺寸评价相结合的检测装置并进行实验验证。结果表明,所构建的超声多参数评价误差小、单调性好;超声检测装置在已知模型的基础上,可对实时采集的超声A扫信号进行特征提取并计算检测位置的平均晶粒尺寸。According to the characteristic parameters of ultrasonic sound velocity,attenuation coefficient and nonlinear coefficient,the detection error of grain size of GH4169 is large.The exponential function is used as the mapping function.The ultrasonic parameters are normalized and then merged to construct new characteristic parameters.The optimization problem with the minimum absolute error is optimized,and the genetic algorithm is used to solve the problem,so as to determine the optimal ultrasonic multiparameter evaluation model,and develop a real-time ultrasonic detection and grain size evaluation combined detection device and verify the experiment.The results show that the constructed ultrasonic multiparameter evaluation error is small and monotonous;based on the known model,the ultrasonic detection device can extract the feature of the ultrasonic A-scan signal collected in real time and calculate the average grain size of the detected position.

关 键 词：晶粒尺寸 GH4169 超声检测 多参数 超声检测装置 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构] TG115.28[自动化与计算机技术—计算机科学与技术]