Magnetic Actuators for Non-Destructive Evaluation (NDE) of Rotating Machinery for Health Diagnostics and Prognostics

从人力和财力的角度来看，在30,000英尺高空发生的喷气发动机故障或在高峰运行时间发生的发电厂停机都是代价高昂的。完善的程序存在的监测和诊断相当严重的问题与旋转机械，但在开发技术，以检测微妙的变化，机器的条件，改善诊断，并制定预测程序，以确定剩余的使用寿命方面取得了很小的进展。 拟议的项目使用主动磁轴承（AMB）作为致动器的一种新的应用程序，用于施加各种已知的力输入到旋转转子，以监测和评估这些输入的响应信号在线。 所提出的程序允许多种形式的力输入信号被施加到旋转结构。 这种方法的一个重要方面是，电磁轴承将与传统的支撑轴承一起用于中轴位置。 以这种方式，诊断/预测程序在这里开发用于任何通用旋转机器，可以设计或改装有一个单一的AMB致动器，并仍然支持在原来的机械轴承。 能够检查各种已知的输入和由此产生的输出，在旋转机械的状态监测是前所未有的，所提出的技术具有广泛的影响，提高操作安全性和降低维护成本的转子轴承系统在航空航天，发电和石化行业。 此外，所提出的程序的本质将最终通过允许一种自测试方法来促进机械自诊断和故障诊断。

AbstractA jet engine failure at 30,000 feet or a power plant shutdown during peak operational hours can be costly from a human as well as financial standpoint. Well-established procedures exist to monitor and diagnosis fairly severe problems with rotating machinery but little progress has been made in developing techniques to detect subtle changes in machine condition for both improved diagnostics, and to develop prognostic procedures for determining remaining service life. The proposed project uses a novel application of Active Magnetic Bearings (AMBs) as actuators for applying a variety of known force inputs to a spinning rotor in order to monitor and evaluate response signals resulting from these inputs on-line. The proposed procedure allows for multiple forms of force input signals to be applied to a rotating structure. An important aspect of this approach is that the AMB(s) will be used in mid-shaft locations in conjunction with conventional support bearings. In this manner, the diagnostic/prognostic procedures are developed here for use on any general rotating machine that can be designed or retrofitted with a single AMB actuator and still be supported in the original mechanical bearings. The ability to examine a variety of known inputs and resulting outputs for condition monitoring in rotating machinery is unprecedented and the proposed technique has broad implications for improving operational safety and reducing maintenance costs in rotor-bearing systems in the aerospace, power generation, and petrochemical industries. In addition, the very nature of the proposed procedure will ultimately facilitate machinery self-diagnostics and prognostics by allowing a method for self-testing.