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

本计画研究含裂纹旋转体之暂态反应 竖井 它包括一个分析和实验部分。 在分析部分中，裂纹将表示为： 集中的力量和力矩，并将假定打开， 在运动过程中闭合，这取决于裂纹处的条件 位置. 轴将通过以下方式加速或减速： 一个或多个临界速度，并将确定响应 使用Galerkin方法。 加速度的影响 以及减速率、裂纹深度、裂纹位置和 将调查偏心率。 近似公式 将寻求最大的回应。 在实验部分， 在这个项目中，激光扫描数据将从两个 无裂纹和裂纹轴模型，并与 解析等价模型。 作为这项研究的结果， 希望能更好地了解 裂纹结构的行为，这提高了诊断 检测各种类型的小裂纹的程序 旋转机械将会出现。* //

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.*** //