Coordination Method Of Mluti-Factors Conflicts For Product Low-Carbon Design

Product Low-Carbon Design (PLCD) is an innovative design methodology designed to decrease the carbon emission in various stages of product lifecycle on the condition that the functions, performances and economic indicators have been achieved, which is both closely related to and distinctly different from green design and eco-design. The contradiction between PLCD and original factors such as functional structure, manufacturing process, installation and disassembly, usage and maintenance, cost-effectiveness is one of main bottlenecks restricting the valid implement of PLCD, which belongs to crucial scientific issues in the sustainable design and manufacturing. Since the contradictions, conflicts and opposition in PLCD involves abundant new knowledge to be updated and dealt, it is a challenging and pioneering research topic studying the conflict coordination method of many factors and multidisciplinary in knowledge evolvement of PLCD.To solve the series of incompatible and opposite conflict problemes in PLCD, the conflict coordination methods for PLCD are researched by utilizing the Extension Design. In this design method, multiple factor associated modeling technology based on carbon footprint, cost and performance in whole life cycle is put forward, then hierarchical low carbon similar retrieval and reasoning mechanical based on multidimensional correlation functions is established, after that dynamic classification method of extensive design based on variable factors are analyzed, and finally low carbon design conflict coordination problemes are solved through the variety of methods integration. The main work includes:The multi-factor modeling for PLCD has been put forward to solve the multi-factor conflicts driven by low carbon demand. The inner relationship of weak or strong relevance, compatibility and conflict are made sure through analyzing the factors of carbon footprint, cost and performance in whole life cycle. The quantitative mapping between the low carbon demand and product case structure is achieved combining the AD theory. The integrated mathematical model of cost and carbon footprint in each stages are established by the improved benefit-cost analysis method. And the relation of product performance is given after improved the performance network. So the conduction and transmission logical relationship among the factors are clearly determined. Based on this, the knowledge model of Low carbon structure base is given using basic-element theory.Research on efficiency dimension reduction problem of multi-dimensional instance retrieval in low carbon design, the establishment and application of multi-dimensional correlation function for low carbon product retrieval has been put forward. To solve the disagreement problem between theory and practice in distance from single-dimension low carbon demand to product case attributes, the side distance formula has been improved through variable-slope principle, then the multi-dimensional side distance is built. For weakness of the formular in relative complexity and no dimension reduction and the effective dimension reduction problem driven by multidimensional low carbon demands, the corresponding multi-dimensional correlation function and its quick dimension reduction method are established. So the low carbon product case hierarchy retrieval method based on the multi-dimensional correlation function is given.The classification method of case dynamic based on hierarchical transformation has been put forward to solve the multi-hierarchy of case feature and the dynamic classification problem driven by low carbon demand. The method innovatively using the formal modeling way to transform the similarity matching result between low carbon demand and case feature to the sesults description model of extension contradiction problem. Thus the classification principle of low caron product case and the classification conduction influence based product case transformation combining similar basic-element cut-set and BP neural network are given. The multi-hierarchy and multi-class classification reasoning methods of low carbon case has been established according to the dynamic demand transformation based multi-dimensional correlation function transformation.The coordination technology of integrated TRIZ and Extention Design for PLCD conflicts has been put forward to solve the conflicts in low carbon design caused by low carbon case’s incomplete mapping. The transition processes of core problem conflict and non-core problem conflicts is established. Then strategy generation method of incompatibility problems based on physical contradictions and opposite problems based on technical contradictions has been given combining TRIZ and extenics. So according the strategy, the low carbon design coordination schemes emergence is achieved after building the coordination process model and giving the calculation method of its key steps and important parameters.In the final, the PLCD prototype system integrated with above theories and method has been applied to large screw air compressor to testify the viability and effectiveness of application technology. That includes low carbon database establishment based multi-factor modeling technology, the analysis and deternation for conflicts produce mechanism in low carbon design, classification technology of low carbon case, the transformation among core problems and non-core problems conflicts in low carbon demand variation, the emerging technology of conflict problemes coordination, the evaluation method of the optimization design scheme outputting, and so on.