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Hull Structural Monitoring of USCG Cutters to Support Long Term Maintenance Decisions

机译：USCG刀具的船体结构监控，以支持长期维护决策

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The U.S. Coast Guard (USCG) operates its cutters in very challenging conditions. While on deployment, these ships are "always ready" (Semper Paratus) for law enforcement or search and rescue activities in heavy weather. For this reason, the USCG initiated a project in 2007 to assess hull structure fatigue design approaches for its new National Security Cutters (NSC). Following the initial fatigue life assessment, two additional cutters were instrumented to support long-term sustainment decisions.This paper presents an overview of hull structural monitoring of USCG Cutters to obtain information on the wave environment and hull structural response used in fatigue analysis of the hull structure. Cost benefit considerations are presented for instrumentation selection used for hull structural monitoring. Conventional strain gauge sensors and advanced acoustic emission approaches for hull structural monitoring are presented with relevant results used in hull structural service life decisions of two USCG cutters. A discussion is presented on the benefits of structural reliability in context of managing the uncertainties associated with the fatigue design and forecasting processes and uncertainty reduction by long-term monitoring. Implications of long-term hull structural monitoring on service life decisions is presented based on the example applications. The return on investment of hull structural monitoring is discussed based on the results of the work conducted. Companion papers are referenced with more detailed discussions of results of the long-term hull structure monitoring and related efforts.The views expressed herein are those of the authors and are not to be construed as official or reflecting the views of the Commandant or of the U.S. Coast Guard.
机译：美国海岸警卫队（USCG）在非常困难的条件下操作其切割机。在部署时，这些船“随时准备就绪”（Semper Paratus），以在恶劣天气下进行执法或搜救活动。因此，USCG在2007年启动了一个项目，以评估其新的国家安全刀具（NSC）的船体结构疲劳设计方法。在初步疲劳寿命评估之后，使用了另外两个切割器来支持长期的维护决策。本文概述了USCG切割器的船体结构监测，以获取有关船体疲劳分析中所使用的波浪环境和船体结构响应的信息结构体。提出了成本效益方面的考虑，以选择用于船体结构监测的仪器。介绍了用于船体结构监测的常规应变仪传感器和先进的声发射方法，并在两个USCG切割机的船体结构使用寿命决策中使用了相关结果。在管理与疲劳设计和预测过程相关的不确定性以及通过长期监测降低不确定性的背景下，讨论了结构可靠性的好处。基于示例应用，提出了长期船体结构监测对使用寿命决策的影响。根据所做工作的结果，讨论了船体结构监测的投资回报。参考文件中包含长期船体结构监测和相关工作成果的详细讨论。此处表达的观点仅为作者的观点，不应被解释为官方观点或反映指挥官或美国的观点。海岸警卫队。

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