An improved crack inspection method based on modal parameters was presented for identifying a crack in a jacket platform.
将基于模态参数的损伤检测方法应用于海洋平台，并进行改进。
2
The longitudinal mobile platform with the inspection module in place is actuated by a stepping motor moves along a guide rail intermittently.
检测模块安装在纵向移动平台上，纵向移动平台由步进电机驱动沿导轨做间歇直线运动。
3
The basic principle of ultrasonic phased array inspection imaging technology and its new development in offshore platform structure inspection are described.