Research On Several Key Issues For Modular Design Of Mechatronic Products With Different Complexity

Facing the increasingly fierce market competition and dynamically changing customer demand,many manufacturing enterprises begin to actively adopt modular architecture for product design and development,in order to effectively control their production costs while maintaining the diversity of product variants.There are many kinds of products with modular design requirements in the market,and their structural characteristics and complexity are also different.In the process of implementing modular design method,product complexity not only determines the difficulty of product structure modeling,but also affects the solution efficiency of product module division scheme.Therefore,this thesis has carried out a series of research on product modular design methods with different complexity.The main research contents are as follows:(1)A product module partition method based on automatic establishment of design structure matrix and improved genetic algorithm is proposed.Firstly,a product information extraction algorithm is developed based on the product 3D assembly model,and on this basis,the automatic construction of product DSM model is realized;Secondly,the mutation operation of the traditional genetic algorithm is improved into transfer mutation and split mutation to improve its global optimization ability when dealing with the problem of module division,and then the optimal module division scheme of the product is obtained by constructing a reasonable objective function;Finally,the effectiveness and feasibility of the proposed module division method are verified by taking the 3D assembly models of gear pumps and bicycles as cases.(2)A modular design method of complex products based on core components is proposed.Firstly,all components of complex products are obtained based on a hybrid product structure decomposition method;Secondly,the core components are selected by calculating the whole life cycle cost of complex product components,and then a simplified DSM model of complex products is established based on the core components;Finally,the hierarchical structure of complex products is obtained based on hierarchical clustering algorithm,and then the optimal module division scheme is obtained through module degree evaluation.In the case part,the single bucket hydraulic excavator is selected to verify the effectiveness and feasibility of this method.(3)The influence of product structure complexity on its modular performance is analyzed.Firstly,by analyzing the current situation of product structure model database,the concept of virtual product structure model database is proposed,and the database is constructed based on the developed random generation algorithm of virtual DSM model;Secondly,the modularization performance of virtual products is obtained through hierarchical clustering algorithm and modularity evaluation,and the influence of product structure complexity on its modularization performance is analyzed based on the big data of numerical simulation experiment,and the variation law of product modularization performance with its structure complexity is summarized;Finally,eight example products are selected from this thesis and published research literature to verify the obtained product modularization law,and prove the universality and reliability of the modularization law.(4)The configuration design method of remanufactured products base on customer demands is proposed.Firstly,the configuration design problem and configuration process model of remanufactured products base on customer demands are introduced;Secondly,a customer satisfaction evaluation method based on improved unit cost utility value is proposed,and then the configuration optimization model of remanufactured products is established,and the configuration optimization model is solved based on genetic algorithm;Finally,a desktop computer is taken as an example to verify the feasibility of the configuration design method.At the same time,relevant numerical experiments are designed to study the influence of customer preference,remanufacturing module and customer purchase budget on the product configuration scheme.(5)Product module division and configuration design software system is developed.Based on the research models and methods of product module division and remanufacturing product configuration design,a product module division and configuration design software system is developed.Firstly,the overall functional architecture of the software system is planned based on the results of functional requirements analysis;Secondly,based on Net framework software development platform,Visual Basic programming language and Microsoft Office Access database development software system;Finally,combined with the case in this thesis,the main functional modules and operation flow of the software system are explained.This thesis has 79 figures,27 tables and 171 references.