基于寿命期成本的电气设备检修策略研究

在建立元件可靠性增长模型的基础上,考虑变电站寿命周期成本(LCC)中运维成本和故障成本的相应变化,应用状态检修和役龄回退因子的理论,对电气元件的维修策略进行优化分析,探讨检修策略对设备可靠性的影响,从而给出基于LCC的最优检修策略建议。分析认为,惩罚成本是LCC理念与可靠性结合的关键,当设备运行年限过长时,建议不再进行状态维修而应更换新设备,而合理的维修策略能够降低故障率和停电损失成本,进一步减小LCC。算例表明,考虑LCC的状态检修,能够比定期检修更好的节约寿命期成本。

Durability zonation standard of concrete structure design

Durability zonation standard （DZS） is proposed to provide useful parameters for durable concrete structure design. It deals not only with the influence of environment on structures, but also with types, functions and importance of structures based on the theory of life cycle cost（LCC）. First, the basic concept of DZS for concrete structure design is defined. Then the basic principles for DZS are established. The factors for zonation according to natural environmental conditions and structural importance are identified. The usefulness of DZS by citing a real application for concrete highway bridges in Zhejiang Province is demonstrated. Finally, durability regulations are provided accordingly to zonation.

High-Speed EMU TCMS Design and LCC Technology Research

This paper introduces the high-speed electrical multiple unit （EMO） life cycle, including the design, manufacturing, testing, and maintenance stages. It also presents the train control and monitoring system （TCMS） software development platform, the TCMS testing and verification bench, the EMU driving simulation platform, and the EMU remote data transmittal and maintenance platform. All these platforms and benches combined together make up the EMU life cycle cost （LCC） system. Each platform facilitates EMU LCC management and is an important part of the system.

Application of stochastic method to optimum design of energy-efficient induction motors with a target of LCC

For an energy-efficient induction machine, the life-cycle cost (LCC) usually is the most important index to the consumer. With this target, the optimization design of a motor is a complex nonlinear problem with constraints. To solve the problem, the authors introduce a united random algorithm. At first, the problem is divided into two parts, the optimal rotor slots and the optimization of other dimensions. Before optimizing the rotor slots with genetic algorithm ( GA), the second part is solved with TABU algorithm to simplify the problem. The numerical results showed that this method is better than the method using a traditional algorithm.

The Use of Life Cycle Cost Analysis to Determine the Most Effective Cost of Installation High Voltage Undersea Cable Bali Strait

Indonesian National Electricity Company （PT.PLN （Persero）） has planned to install additional high voltage undersea cable for circuit llI and IV Java-Bali to fulfill electricity demand in Bali. This project was more prefered compared to building another power plant in Bali which could raise social and cultural resistance. Life cycle cost method was used to complete the financial feasibility study to ensure if the project has economic benefit, and the asset would be used effectively and efficiently along its benefit period. In this paper, a life cycle cost will be simulated to analyze which alternative is the most profitable： installation circuit III and IV in 2012 or installation circuit III in 2012 and circuit IV in 2017 in accordance with load forecasting demand. This study is used to help the management to make a decision about the project.

Estimating the Service Lives of Building Products in Use

Reliable service life data of building products are of great importance when completing environmental LCA （life cycle assessment） reviews, for LCC （life cycle costing） and for maintenance planning tasks. A research project was set up to answer the following research questions： （1） what are reliable service life data of current used building products; and （2） how can generic data about the service lives of building products be tailored to specific project circumstances using the ＂factor method＂ described in the ISO （International Standard Organization） 15686 Series： ＂Buildings and Constructed Assets-Service-Life Planning＂. Experts of industry organisations for building materials and products made a final judgement of the new established reference service lives. Reference service lives of building products may show a large unknown bandwidth around the average. That will make the bandwidth of estimated service lives, taking the project situation of building components into account, very big. Experts have raised objections to the use the factor method for deriving mathematically a bandwidth of estimated service lives of a building product from the reference service life of the product. A practical analytical application of the factor method has been made by describing all factors and underlying criteria and a reference situation.

Economic Analysis of using Above Ground Gas Storage Devices for Compressed Air Energy Storage System

Above ground gas storage devices for compressed air energy storage(CAES) have three types:air storage tanks,gas cylinders,and gas storage pipelines.A cost model of these gas storage devices is established on the basis of whole life cycle cost(LCC) analysis.The optimum parameters of the three types are determined by calculating the theoretical metallic raw material consumption of these three devices and considering the difficulties in manufacture and the influence of gas storage device number.The LCCs of the three types are comprehensively analyzed and compared.The result reveal that the cost of the gas storage pipeline type is lower than that of the other two types.This study may serve as a reference for designing large-scale CAES systems.