Real-Time Non-Destructive Evaluation of Fatigue Crack Damage for Health Monitoring of Mechanical Structures

机械结构健康监测疲劳裂纹损伤实时无损评估

• 批准号: 9819074
• 负责人: Asok Ray
• 金额: $ 20万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-15 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9819074&HistoricalAwards=false
• 关键词: Real; Time; Non; Destructive; Evaluation

The goal of the proposed research is to develop real-time non-destructive evaluation (NDE) methods for health monitoring and residual life prediction of mechanical structures and aging machinery. The specific objectives are: quantification & estimation of fatigue crack damage; and assessment of the time to onset of widespread fatigue damage. The technical approach relies on fusion of heterogeneous information derived from physics-based analytical models and real-time sensor data. The analytical part of the research will be supported by laboratory experimentation on a special-purpose fatigue test apparatus that is equipped with multiple sensing devices - optical, electromagnetic, and ultrasonic. Fusion of multiple sensor data with a stochastic state-space model of fatigue crack growth will allow non-destructive evaluation of the current state of damage and prediction of the residual life in real time. This hardware-software combination constitutes a novel NDE system that can be executed on inexpensive platforms such as a Pentium processor and is ideally suited for adaptation to operating machinery. As such the NDE system will also serve as a real-time analytical sensor of fatigue crack damage for control applications. The proposed NDE system will enhance safety and productivity in a wide range of industries and thereby reduce life cycle costs. Specifically, the NDE system will be applicable to real-time health monitoring and residual life prediction in active (e.g., turbines and pumps), semi-active (e.g., heat exchanger tubes), and passive (e.g., pressure vessels) structures that are subjected to both low-cycle and high-cycle fatigue damage. Furthermore, it will allow generation of early warnings to avert impending failures of critical plant components, which will reduce the probability of emergency shutdowns and catastrophic accidents.

提出的研究的目标是开发实时无损评价（NDE）的健康监测和剩余寿命预测的机械结构和老化机械的方法。 具体目标是：疲劳裂纹损伤的量化估计和广泛疲劳损伤开始的时间评估。 该技术方法依赖于融合来自基于物理的分析模型和实时传感器数据的异构信息。 该研究的分析部分将得到实验室实验的支持，该实验室实验采用了一种特殊用途的疲劳测试设备，该设备配备了多种传感设备-光学，电磁和超声波。 将多个传感器数据与疲劳裂纹扩展的随机状态空间模型相融合，将允许无损评估当前的损伤状态和预测真实的剩余寿命。 这种硬件-软件组合构成了一种新颖的无损检测系统，可以在廉价的平台上执行，如奔腾处理器，非常适合于适应操作机械。 因此，无损检测系统也将作为一个实时分析传感器的疲劳裂纹损伤的控制应用。 拟议的无损检测系统将提高安全性和生产力，在广泛的行业，从而降低生命周期成本。 具体地说，NDE系统将适用于实时健康监测和剩余寿命预测，涡轮机和泵），半主动（例如，热交换器管），和被动的（例如，压力容器）结构，其经受低周和高周疲劳损伤。 此外，它还能发出早期预警，避免电厂关键部件即将发生的故障，从而降低紧急关闭和灾难性事故的可能性。