Research On The Whole Lifecycle Evolution Of Modular Product Structure Of Small Agricultural Machinery

Small Agricultural Machinery(SAM)has been widely used in narrow and complex environments because of its lightness and flexibility.With the refinement of the agricultural production process and the raise of the operation requirements of farmers,the rapid customization of SAM products based on the personalized demands can bring stronger competitiveness to SAM enterprises,but also lead to the contradiction between personalization and profit.In this paper,an evolution research of SAM modular product structure in the whole lifecycle is proposed.Which is designed to provide a complete modular transformation guide to SAM enterprises.In this way,enterprises can build SAM modular product structure and guide its positive evolution,so that it can keep the market competitiveness and constantly provide customers with personalized SAM products.For this reason,this paper analyzes the related research status of SAM,and explains the concepts of evolution object and period.The evolution is divided into three dimensions:time dimension,process dimension and configuration dimension.The evolution of process dimension and configuration dimension is called evolution control,and the evolution of time dimension and process dimension is called evolution update.Firstly,the module division and granularity optimization are analyzed.A nonlinear assignment method is proposed to distinguish the strength of four kinds of relationship between components,and the indirect correlation degree is added to construct the full relevance relationship matrix.An elite-retained adaptive crossover mutation genetic algorithm is developed to optimize the sorting of the full relevance relationship matrix,so that the closely related parts can be clustered together.And the granularity optimization analysis indexs in module and part levels are set to guide the final module division.Secondly,the whole life cycle evolution model is constructed.According to the different work emphases in different stages of the whole life cycle,the evolution objects are segmented with different stages,and on this basis,a four-level modular product structure evolution modeling system is proposed.So the functional tree,principle-structure tree,processing-assembly tree and requirement tree are constructed for different life cycle stages.And the key information of node objects in each stage is extracted through attribute modeling,the link between nodes is established through parent-child relationship,subordinate relationship and composability relationship.Then,the methods of evolution control and evolution update are studied.For evolution control,two methods based on similarity recommendation and configuration are proposed for the acquisition of personalized customization scheme,and a relevance relationship topological view generation method of parts-technology-equipments is proposed for the management of customized product production process.By analyzing the driving factors,layers and modes of evolutionary updating,the corresponding updating process is put forward to guide the interactive updating among different objects.Finally,the micro-cultivator was taken as an example to demonstrate the process of modular granularity optimization,the construction process of whole lifecycle evolution model,and the process of evolution control and update respectively,which verifies the feasibility of each method and the consistency among the methods,and forms a complete modular product structure evolution method system.In the end,the research content and future work of this paper are summarized and prospected,and it is pointed out that this method system can be extended to the evolution control of other types of products.