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A life cycle costing approach for discounting in age and interval replacement optimisation models for civil infrastructure assets

机译:寿命周期成本核算方法,用于民用基础设施资产的折旧和间隔更换优化模型

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摘要

Civil infrastructure assets, such as roads, locks, bridges, treatment plants and storm surge barriers, are often characterised by long service lives and corresponding technical life cycles. When life cycles are long, the time value of money plays a role in asset management decision-making on capital investments and operation and maintenance expenditures. In this paper, a new life cycle costing (LCC) approach for discounting in two classes of maintenance optimisation models is developed. These models are the age replacement model and the interval replacement model. Three well-known LCC techniques, which are the present worth, the capital recovery and the capitalised equivalent worth, are combined and used to develop a stepwise methodology. This methodology is validated with the few case-specific mathematical equations that exist in the literature. The advantage of using this alternative LCC approach is its applicability and flexibility for reliability and maintenance engineers. The resulting LCC method builds on well-known LCC formula and enhances the understanding of the inclusion of discounting principles in reliability models. Understanding these principles makes the method flexible. Practitioners can extend or adapt the method to changing circumstances, such as additional cash flows and altering reliability modelling.
机译:道路,锁,桥梁,污水处理厂和风暴潮屏障等民用基础设施资产通常具有较长的使用寿命和相应的技术生命周期。当生命周期较长时,金钱的时间价值在资本投资以及运营和维护支出的资产管理决策中发挥作用。在本文中,开发了一种用于折扣的两类维护优化模型的新生命周期成本(LCC)方法。这些模型是年龄替换模型和间隔替换模型。结合了三种众所周知的LCC技术(即现值,资本回收和资本化的等值价值),并用于开发逐步方法。该方法论已通过文献中存在的几个案例特定的数学方程式得到了验证。使用这种替代LCC方法的优势在于其对可靠性和维护工程师的适用性和灵活性。由此产生的LCC方法建立在众所周知的LCC公式的基础上,并增强了对可靠性模型中包含折现原理的理解。了解这些原理可使该方法变得灵活。从业者可以扩展该方法或使该方法适应不断变化的环境,例如额外的现金流量和更改可靠性模型。

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