可靠性约束的大科学装置全生命周期成本建模与优化方法

发布时间：2018-05-28 17:49

本文选题：系统可靠性设计 + 全生命周期成本　；参考：《电子科技大学》2014年硕士论文

【摘要】：大科学装置通常具有投资规模大、建设运行周期长、技术复杂程度高的特点。大科学装置的建设不仅是我国综合国力日益提高的体现,也对我国科学技术的进步和发展起到极大的促进作用,具有广泛的社会影响意义。在大科学装置立项论证与设计方案论证时,通常侧重考虑其性能和研制费用,会忽略系统运行阶段的维护和保障费用支出,也对可靠性设计和全生命周期成本(Lifecycle Cost,LCC)的综合优化考虑不足。考虑全生命周期成本理论与可靠性设计优化、备件保障管理和维修策略的结合,提出可靠性约束下的大科学装置全生命周期成本优化模型,为系统的可靠性设计和优化提供科学决策的思路和方法,是系统成本管理和可靠性设计的综合优化问题。针对由N个不可修部件组成的系统,在系统备件保障度的约束下,研究系统可靠性设计值、备件储备量和LCC的解析关系。在部件寿命服从威布尔分布的条件下,通过对设计费用模型与制造费用模型的构建与完善,建立包括设计费用、制造费用、备件存储费用和维修费用在内的系统LCC优化模型。经过优化求解,得到满意的可靠性设计水平、LCC最小值和最优备件存储量。针对可修系统,采用预防性维修策略,构建可靠度约束下的可修系统的LCC优化模型,进而得到包含预防性维修策略的可靠性设计水平与最优LCC的关系曲线。通过对比分析未考虑预防性维修策略的LCC曲线,揭示可靠性设计水平、预防性维修策略和最优LCC的内在关系,为系统设计中的费效改进提供思路和方法。接着完整地提出包括均衡的系统全生命周期成本、可靠性设计水平和预防性维修次数在内的系统设计均衡区域的决策方法。将上述方法应用于某大科学装置的设计阶段,开展两个案例系统的可靠性设计和成本管理的优化分析,验证所提出方法的有效性和实用性。本文提出的研究思路和方法有助于系统设计师在设计阶段分析和解决系统运行阶段的维护和保障费用支出问题、可靠性设计与全生命周期费用的综合优化问题。特别是,满足经济性和可靠性要求的设计均衡区域对于大科学装置的设计、建造和运行维护具有明显的理论和工程应用价值。
[Abstract]:Large scientific equipment usually has the characteristics of large scale of investment, long construction cycle and high technical complexity. The construction of large scientific equipment is not only an embodiment of the increasing comprehensive national strength of our country, but also a great promotion to the progress and development of science and technology in our country. It has extensive social influence. When demonstration and design scheme is proved, it usually emphasizes its performance and development cost, neglects the maintenance and support expenses of the system operation stage, and also considers the comprehensive optimization of reliability design and Lifecycle Cost, LCC, considering the whole life cycle cost theory and reliability design optimization, spare parts support pipe The combination of rational and maintenance strategies, the whole life cycle cost optimization model of large scientific equipment under the reliability constraint, the idea and method of providing scientific decision for the system reliability design and optimization, is the comprehensive optimization problem of the system cost management and reliability design. For the system composed of N non repairable components, the system spare parts are in the system spare parts. Under the constraints of the degree of support, the reliability design value of the system and the analytical relationship between the spare parts reserve and the LCC are studied. Under the condition that the component life obeys Weibull distribution, through the construction and improvement of the design cost model and the manufacturing cost model, the system LCC is optimized, including the design cost, the manufacturing cost, the spare parts storage cost and the maintenance cost. After optimizing the model, the satisfactory reliability design level, the LCC minimum value and the optimal spare parts storage are obtained. According to the repairable system, the LCC optimization model of the repairable system under the reliability constraint is constructed with the preventive maintenance strategy, and then the relationship curve of the reliability design level and the optimal LCC is obtained. By comparing and analyzing the LCC curve that does not consider the preventive maintenance strategy, it reveals the reliability design level, the preventive maintenance strategy and the internal relationship of the optimal LCC, and provides ideas and methods for the improvement of the cost efficiency in the system design. Then, the whole life cycle cost, the reliability design level and the preventive maintenance times including the balanced system are fully proposed. The system designs the decision-making method of the equilibrium region. The above method is applied to the design stage of a large scientific device. The reliability design and cost management of the two case systems are carried out to verify the effectiveness and practicability of the proposed method. The research ideas and methods proposed in this paper are helpful to the design of the system designers. This paper analyzes and solves the problem of maintenance and guarantee expenditure in the operation stage of the system and the problem of the comprehensive optimization of the reliability design and the total life cycle cost. In particular, the design equilibrium area which meets the requirements of economy and reliability has obvious theoretical and engineering application value for the design, construction and maintenance of large scientific equipment.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB114.3

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