With the brief description of the basic principle of air-coupled non-contact ultrasonic testing, the factors affecting the whole signal path losses of air-coupled ultrasonic testing are deduced.
介绍了空气耦合非接触式超声检测技术基本原理，推导了该技术中信号传输衰减理论构成因式。
Based on testing data, the basic factors and rules influencing shaft torques of SWITN'S device are analysed. It provides scientific proof for further analysis of the universal joint-shaft broken.
本文在斯威顿杠杆传动轴扭矩的实例基础上， 系统地分析了不同工况下杠杆传动轴扭矩负荷的变化规律，为解决生产过程中万向接轴时常断裂提供了科学依据。
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