Research On Production And Distribution Optimization Of Prefabricated Building Components Based On NSGA-Ⅲ

With the increase of labor and construction costs,keywords such as green development and ecological protection have gradually been integrated into people’s demand for buildings.However,currently prefabricated buildings are limited by management methods,schedule control,etc.,resulting in the production,delivery,and distribution of prefabricated components that cannot be completed on time,which delays the overall construction schedule and causes additional cost losses.Therefore,it has strong practical significance to carry out reasonable and effective operation plan and schedule control for the key links in prefabricated buildings.This research focuses on the two stages of production and distribution of prefabricated components of prefabricated buildings,and studies their production operation planning and distribution cost optimization respectively.The main research work is as follows:(1)First of all,through field investigation,analysis and review of prefabricated building related literature,understand the production process and distribution process of prefabricated components,respectively summarize the characteristics of production and distribution and the shortcomings of existing research.(2)Secondly,based on the deficiencies of the current planning management methods,an intelligent formulation method for the production scheduling operation plan of prefabricated components is proposed.Aiming at the mixed production process of prefabricated components in multi-line workshops,a high-dimensional multiobjective optimization model was established,and the NSGA-Ⅲ algorithm suitable for solving high-dimensional multi-objectives was selected to solve the high-dimensional model.The initial solution of the algorithm is improved,which can effectively avoid the defect of the algorithm being affected by the initial population.(3)Then,considering the appropriate distribution situation in real life,a two-level planning distribution model is designed.The upper and lower models are optimized for the customer allocation problem and vehicle scheduling problem of component distribution between the production plant and each construction site.After using the NSGA-Ⅲ algorithm to find a reasonable allocation plan,a dual-population improved genetic algorithm with enhanced elite retention is used to dispatch vehicles reasonably.(4)Finally,according to the proposed production scheduling model and the twolevel planning distribution model,the improved optimization method proposed above is applied to analyze and verify an actual calculation example.The results of this research will help to improve the production efficiency,management effect and cost optimization of prefabricated components.On the one hand,using the model and algorithm of this research can optimize component production sequencing,realize load balancing of multiple pipelines,design production scheduling plans reasonably and effectively,and improve production efficiency.On the other hand,it can closely connect production and distribution,reduce the risk of delivery defaults,reduce inventory costs,and provide certain theoretical support for the industrial upgrading and transformation of prefabricated buildings.