Research On Mechanical Products Life Cycle Design Evaluation Methods And Application

Because of the environmental issues during the economic development in recent years, the life cycle environmental influence was taken into consideration during products design, and thus the life cycle design of mechanical products has been vigorously promoted, and also the demands for the product life cycle design evaluation are growing. The life cycle design demands of the mechanical products in various industries were analyzed, and the evaluation index system based on the life cycle multi-level divided model was put forward. Besides that, according to the life cycle design technologies, three core assessment methods were presented:the life cycle design assessment method based on modular benefit evaluation, the life cycle design economic benefit evaluation method based on Life Cycle Cost (LCC) and the life cycle design environmental benefit evaluation method based on carbon emission.The first chapter described the significance of life cycle design evaluation for the enterprises and the faced difficulties. Then the domestic and international status quo of related fields were reviewed, the deficiencies of the current studies were summed up, and the research content was given.The second chapter proposed the overall architecture of this paper, analyzed the life cycle design demands of the mechanical products in various industries, and summarized the basic requirements of life cycle design of mechanical products: product quality (Q), product cost (C), user satisfaction (U) and product and process environmental friendliness (E). Combined with the life cycle multi-level divided model, the basic evaluation index system was put forward. The research objects of this paper were also introduced:the product modular benefit evaluation on the machine level, LCC assessment on the equipment level and carbon emission assessment on the parts level, machine level, and equipment level.The chapter three researched the life cycle design assessment method based on modular benefit evaluation for product level. And the sub-evaluation index system for modular benefits evaluation was defined. And the modular benefits assessment model was established.The chapter four researched the life cycle design economic benefit evaluation method based on LCC, because of the requirements, such as bidding, investment calculation, et al. The life cycle cost model was built. And the investment cost, operation cost, maintenance cost, defects cost and disposal cost were included in it.The chapter five proposed the life cycle design environmental benefit evaluation method based on carbon emission for three levels(parts, machine, and equipment), and analyzed the differences between them.The chapter six designed the Life Cycle Design Assessment System. After that, with the application of industrial steam turbine case, the validity of the three methods and the value of the system were elaborated.The chapter seven summarized the research work, generalized the main content and innovation of the thesis, and prospected research work in the future.