毕业论文（设计）激光快速成型TC4超声衰减系数测量.doc

激光快速成型TC4超声衰减系数测量
摘要:为了改进激光快速成型TC4的超声检测工艺,必需要了解激光快速成型TC4的衰减系数,常规的超声检测方法自动化程度不高,测量衰减系数选取的点不够多,检测缺陷的灵敏度也不够,很难准确地测量出激光快速成型TC4的衰减系数。本文以激光快速成型TC4为研究对象,利用超声射入工件的表面波、第一次底波和第二次底波等这些可测参量,对激光快速成型TC4进行超声无损评价。
本文利用水浸式超声扫查系统对激光快速成型TC4试件进行超声数据采集,采用不同频率的探头进行扫查,测得激光快速成型TC4的声速,一次底波和二次底波,对底波进行分析,利用基于Python进行编译的软件对数据进行处理,比较不同频率的探头对实验数值的影响,根据处理过的数据,得到衰减图,得到激光快速成型TC4的超声衰减系数,分析实验数据得到最终处理结果。
关键词: 激光快速成型TC4 衰减系数水浸式超声扫查系统底波
指导老师签名:

The Ultrasonic Attenuation Coefficient Measurement of Laser Rapid Prototyping TC4
Student name: Liu Yongxing Class:110813
Supervisor: Zhang Shijing
Abstract: In order to improve the ultrasonic testing technology of laser rapid forming of TC4 requires an understanding of the attenuation coefficient of laser rapid forming of TC4, conventional ultrasonic testing method of degree of automation is not high, not enough measurements fall into the coefficient selection point, defect detection sensitivity is not enough, difficult to accurately measurement by laser rapid forming of TC4 attenuation coefficient. In this paper, a laser rapid forming of TC4 as the research object, using ultrasonic scoring of the work piece surface waves, the first bottom wave and the second bottom wave these measured parameters, the laser rapid forming of TC4 ultrasonic nondestructive evaluation.
The water immersion ultrasonic scanning system of laser rapid forming of TC4 specimens of ultrasonic data acquisition, using different frequency probe was used to scan, measured by laser rapid forming of TC4 velocity, a bottom wave and second wave base, on the bottom wave is analyzed, The use of piled based on Python for data processing, the effects of different frequencies of the probe for the numerical experiments, according to data processing, obtained the attenuation map. Get laser rapid forming of TC4 ultrasonic attenuation coefficient and analysis of experimental information to get the final result.
Keyword:Laser rapid prototyping TC4 Attenuation coefficient Ultrasonic scanning s