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

该项目检查破裂旋转轴的瞬态响应。 它包括分析和实验部分。 在分析部分中，裂纹将由集中力和力矩来表示，并假设在运动过程中根据裂纹位置的条件打开和关闭。 轴将通过一个或多个临界速度加速或减速，并使用伽辽金方法确定响应。 将研究加速度和减速度、裂纹深度、裂纹位置和偏心率的影响。 将寻求最大响应的近似公式。 在该项目的实验部分，将从未破裂和破裂的轴模型中获得激光扫描数据，并将其与分析等效模型相关联。 这项研究的结果预计将加深对裂纹结构行为的理解，并且将出现用于检测各种类型旋转机械中小裂纹的改进诊断程序。*** //

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.*** //