Research On Production Optimization Methods For Prefabricated Concrete Components In Prefabricated Buildings

The production of prefabricated components which acted as a key component of prefabricated buildings directly affects the progress and cost of prefabricated buildings in the background of vigorously promoting prefabricated buildings in China.At present,the production optimization of prefabricated components is often focused on certain production links,and the relationship between them is ignored.So in this article from the aspect of improving the overall cooperative operation of the production,it put forward a new idea to decompose production optimization of prefabricated components into two stages which included layout optimization of prefabricated components and production scheduling optimization.And the production data of prefabricated components is transferred with the mold and die table as the core to establish the connection between the two links.The main research content and results were as follows:(1)A layout optimization model of prefabricated components considering the number of molds is constructed.Based on the analysis of the optimization of the layout of prefabricated components,combined with the production characteristics of prefabricated components,considering the number of mold constraints in the actual production process,the relevant constraints and problem assumptions are clarified.According to the theory of the two-dimensional layout problem,the mathematical model of the layout optimization problem with the minimum number of mold tables as the optimization goal is constructed.(2)The layout optimization algorithm is designed.On basis of the layout optimization model,a genetic algorithm with the lowest horizontal level is put forward.Considering the characteristics of the layout optimization problem,a two-layer coding combining real coding and 01 coding is adopted.According to the features of the first layer coding and the second layer coding,corresponding crossover and mutation methods are designed to enhance algorithm optimization capabilities.It could be checked from the application of the case that when we compared it with manual experience,the layout optimization algorithm could help to reduce the number of mold tables used by 27.8% and increase the utilization rate of mold tables by 19.5%.This proved that the raised model had high applicability and the proposed algorithm had good solution performance.(3)The production scheduling model of prefabricated components under the dual resource constraints of mold and steam curing is constructed.Based on the analysis of the optimization of the production scheduling of prefabricated components,combined with the process production characteristics of prefabricated components,the problem assumptions,process constraints and objective functions are defined.Then,a mathematical model for production scheduling optimization using the pallet set as the prefabricated component production unit was established under the two resource constraints of mold and steam curing.(4)Optimization algorithm of production scheduling was designed.By combining the features of genetic algorithm and particle swarm algorithm,a genetic particle swarm hybrid algorithm on account of artifact coding ideas was raised to solve the production scheduling model of prefabricated components.The hybrid algorithm has eliminated the poor range individuals by exchanging information between chromosome populations and particle swarms during each iteration at the same time enhanced the performance of the algorithm.From the actual example we can find that when compared with artificial experience,the genetic particle swarm hybrid algorithm can reduce the completion time by 10.8% which has fully verified that the proposed model and algorithm was able to provide a reasonable and feasible production scheduling scheme for prefabricated components.