Detection of Cracks in Rotating Shafts - An Analytical and Experimental Investigation

本项目研究有裂纹的转轴的瞬时响应。它由分析和实验两部分组成。在分析部分，裂纹将由集中力和力矩表示，并假定裂纹在运动过程中根据裂纹位置的条件而打开和关闭。轴将通过一个或多个临界速度来加速或减速，响应将使用Galerkin方法来确定。研究了加减速、裂纹深度、裂纹位置和偏心距对裂纹扩展的影响。将寻求最大响应的近似公式。在本项目的实验部分，激光扫描数据将从无裂纹和有裂纹的轴模型中获得，并与解析等效模型进行关联。作为这项研究的结果，预计将对裂纹结构的行为有更好的了解，并将出现改进的诊断程序，以检测各种类型的旋转机械中的小裂纹。

This project examines the transient responses of cracked rotating shafts. It comprises an analytical and experimental component. In the analytical part, the crack will be represented by concentrated forces and moments, and will be assumed to open and close during the motion depending on the conditions at the crack location. The shaft will be accelerated or decelerated through one or more critical speeds, and the response will be determined with the use of Galerkin's method. The effects of acceleration and deceleration rate, crack depth, crack position and eccentricity will be investigated. Approximate formulas for the maximum response will be sought. In the experimental part of this project, laser scan data will be obtained from both uncracked and cracked shaft models and correlated with the analytically equivalent models. As a result of this study, it is expected that there will be an improved understanding of the behavior of cracked structures, and that improved diagnostic procedures for detecting small cracks in various types of rotating machinery will emerge.*** //