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A service life extension (SLEP) approach to operating aging aircraft beyond their original design lives.

机译：服务寿命延长（SLEP）方法可以使老化的飞机运行超出其原始设计寿命。

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摘要

With today's uncertain funding climate (including sequestration and continuing budget resolutions), decision makers face severe budgetary challenges to maintain dominance through all aspects of the Department of Defense (DoD). To meet war-fighting capabilities, the DoD continues to extend aircraft programs beyond their design service lives by up to ten years, and occasionally much more. The budget requires a new approach to traditional extension strategies (i.e., reuse, reset, and reclamation) for structural hardware. While extending service life without careful controls can present a safety concern, future operations planning does not consider how much risk is present when operating within sound structural principles. Traditional structural hardware extension methods drive increased costs. Decision makers often overlook the inherent damage tolerance and fatigue capability of structural components and rely on simple time- and flight-based cycle accumulation when determining aircraft retirement lives.;This study demonstrates that decision makers should consider risk in addition to the current extension strategies. Through an evaluation of eight military aircraft programs and the application and simulation of F-18 turbine engine usage data, this dissertation shows that insight into actual aircraft mission data, consideration of fatigue capability, and service extension length are key factors to consider. Aircraft structural components, as well as many critical safety components and system designs, have a predefined level of conservatism and inherent damage tolerance. The methods applied in this study would apply to extensions of other critical structures such as bridges. Understanding how much damage tolerance is built into the design compared to the original design usage requirements presents the opportunity to manage systems based on risk. The study presents the sensitivity of these factors and recommends avenues for further research.
机译：在当今不确定的融资环境（包括隔离和持续的预算决议）下，决策者面临严峻的预算挑战，要在国防部（DoD）的各个方面保持主导地位。为了满足作战能力，美国国防部继续将飞机计划的使用期限延长至其设计使用寿命之外，最多十年，有时甚至更多。预算要求采用一种新的方法来应对结构硬件的传统扩展策略（即重用，重置和回收）。尽管在没有仔细控制的情况下延长使用寿命会带来安全隐患，但未来的运营计划并未考虑在合理的结构原则下进行操作会带来多少风险。传统的结构硬件扩展方法导致成本增加。决策者通常会忽略结构部件固有的破坏承受力和疲劳能力，并在确定飞机的退休寿命时依靠简单的基于时间和飞行的周期累积。本研究表明，决策者除了当前的扩展策略外还应考虑风险。通过对八种军用飞机程序的评估以及F-18涡轮发动机使用数据的应用和仿真，表明对飞机实际任务数据的了解，对疲劳能力的考虑以及服务期限的延长是需要考虑的关键因素。飞机结构组件以及许多关键的安全组件和系统设计具有预定的保守性和固有的损坏承受能力。本研究中使用的方法将适用于其他关键结构的扩展，例如桥梁。了解与原始设计使用要求相比，设计中内置了多少损坏容忍度，这为基于风险管理系统提供了机会。该研究提出了这些因素的敏感性，并提出了进一步研究的途径。

著录项

  • 作者

    Pentz, Alan Carter.;

  • 作者单位

    The George Washington University.;

  • 授予单位 The George Washington University.;
  • 学科 Engineering System Science.;Engineering Aerospace.;Engineering General.
  • 学位 D.Sc.
  • 年度 2015
  • 页码 192 p.
  • 总页数 192
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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