Research On The Structure Improvement Method Of Green Product Driven By Variable Demand

Because of the increasing environmental problems,such as global warming and air pollution,the environmental awareness of human has been continuously strengthened and the demand for environmental performance of products has also increased.Manufacturers can meet the changing needs of consumers and take the lead in the market only by green design.This dissertation made researches on structure improvement method of green products from the perspective of users’ environmental requirements.The main contents are as follows:(1)Aiming at the problem of long design cycle due to the complicated product structure in the traditional improvement design,the extraction method of structural common feature is proposed based on structural similarity theory.Then,the quantification of environmental performance is analyzed.The method for determining the inheritability of product structure is proposed.(2)Aiming at the problem of how to obtain users’ environmental need and map them to product structures,the users’ environmental needs are extracted by association matrix after the collection and analysis of users’ needs.Then,the set of users’ environmental requirements of products is obtained.A hierarchical mapping method of user’s environmental demand-environmental performance weight-product structure is proposed.The first layer mapping is realized by the method of fuzzy analytic hierarchy process and quality function deployment and the relationship between them is mined by the model of multi-layer perceptron.Then,the second layer mapping is realized by the method of probability mapping.(3)Aiming at the problem of how to improve green product structures,four structure variation operations were proposed.The variation map of product structures was generated by the genetic algorithm to achieve the purpose of improving the product.Finally,the life cycle assessment method was used to compare the environmental impacts of the products before and after the improvement to verify whether the improvement process is effective.The proposed methodology is successfully applied to transmission housing and the environmental impact is found to be better than before improvement.