使用VB6.0语言对在R0B65VIS型自动检测设备下的圆棒类工件超声自动化检测时灵敏度的校准进行了仿真研究。根据超声检测中声波传播过程的特点，提取了其数学模型和主要原理，实现了圆棒类工件自动化超声波检测时灵敏度校准的过程模拟。该研究解决了圆棒类工件灵敏度调节时各类参数较多，计算比较复杂以及自动化检测中由于棒材高速旋转导致灵敏度调节时人工缺陷回波识别困难的问题。仿真模型具有通用性，能对实际检测时灵敏度校准提供理论指导。

With VB 6.0 as a platform, the adjustment of sensitivity in the automatic ultrasonic testing (UT) of round-stick workpieces using R0B65VIS automatic testing equipment was simulated. According to the features of the sound wave spreading process in UT, its mathematical model and main principle were extracted, which realized the simulation of the sensitivity adjustment in automatic UT of round-stick workpieces. This thesis solved two basic problems, complicated calculation due to the various parameters in the sensitivity adjustment of round-stick workpiece testing and difficulties in judgment of the artifical flaw resulted from tail-wagging of the stick material in automatic testing. This simulation modeling was generally applicable for all purposes, which provided theoretical instruction for the sensitivity adjustment in practical testing.