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

摘要从人的角度和经济角度来看，3万英尺高空的喷气发动机故障或发电厂在高峰运行时间关闭可能会造成人员和财务方面的损失。已有完善的程序来监测和诊断旋转机械的相当严重的问题，但在开发技术以检测机器状况的细微变化以改进诊断和开发用于确定剩余使用寿命的预测程序方面进展甚微。该项目使用主动磁轴承(AMBS)作为执行器的一种新应用，将各种已知的力输入施加到旋转转子，以便在线监测和评估这些输入产生的响应信号。所提出的程序允许将多种形式的力输入信号施加到旋转结构。这种方法的一个重要方面是，磁悬浮轴承(S)将与传统的支承轴承一起用于轴的中间位置。通过这种方式，这里开发的诊断/预测程序适用于任何通用旋转机器，这些机器可以设计或改装单个磁力轴承执行器，并且仍然支撑在原始机械轴承中。为旋转机械的状态监测检查各种已知输入和最终输出的能力是史无前例的，拟议的技术对提高操作安全性和降低航空航天、发电和石化行业转子-轴承系统的维护成本具有广泛的影响。此外，拟议程序的本质最终将通过允许一种自我测试的方法来促进机械自我诊断和预后。

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.