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For mission-oriented systems designed for long-term operation, this study incorporates the time-varying value of money into the analysis. Unlike traditional maintenance strategies, the study introduces a new approach to periodic replacement policies. This approach considers variable costs and aims to improve system performance and reliability. The first step integrates the discount rate into basic periodic replacement policies. Next, the study addresses the first and last replacements to balance maintenance simplicity with economic efficiency. Numerical examples are provided for each replacement scenario, demonstrating the practical applicability and effectiveness of the proposed strategies. These examples yield valuable insights that can guide engineers in managing scheduled replacement strategies for systems designed for specific missions throughout their extended operational lifetimes.

针对面向任务且需长期运行的系统，本研究将货币的时变价值纳入分析范畴。相较于传统维护策略，本研究提出一种适配周期性更换策略的全新方案，该方案考量可变成本，旨在提升系统性能与可靠性。研究首先将折现率整合至基础周期性更换策略中，随后针对首次与末次更换场景进行优化，以平衡运维便捷性与经济效益。本研究为各类更换场景提供数值算例，验证所提策略的实际适用性与有效性；这些算例可提供极具价值的工程参考，能够指导工程师针对面向特定任务的系统，在其全生命周期延长运行阶段的计划性更换策略开展管理工作。