Research And Implementation Of Scheduling Optimization Method For Prefabricated Building Components

In recent years,with the promotion of new-type urbanization,the development of prefabricated construction industry has become the main trend of today’s construction industry.How to make component production schedule with low cost as the goal has become an important subject worthy of study in the field of prefabricated building.Diversified prefabricated architectural styles expand users’ demand for component types,leading to a sharp increase in the number of molds required for component production.The team leader cannot accurately calculate the minimum number of molds required for each type under the constraints of complex production workshops,resulting in high mold costs.At the same time,due to the weak connection between the component factory and the construction site,the factory personnel cannot reasonably arrange the component production according to the construction site installation schedule.Due to the limited space of temporary storage area,the prematurely produced components are transported to the storage yard,resulting in high internal transportation cost.Therefore,from the perspective of component scheduling,this paper puts forward three aspects of component scheduling method design oriented to mold cost optimization and internal transportation cost optimization and prefabricated building component scheduling system.The main work of this paper is as follows:(1)In terms of mold cost,this paper establishes a mold cost optimization model and proposes a component scheduling method based on genetic algorithm(component scheduling method based on genetic algorithm,GA-CSM)to solve the problem that mold cost is too high due to the inability to accurately calculate the production quantity of various types of molds.The method to minimize the mold cost as the goal,each component production scheduling program code into a chromosome,solving the optimal component production scheduling scheme and mold production plan,workers according to the mold production plan to build the optimal number of mold,the subsequent production scheduling plan according to the component to finish artifacts with less number of mold production,to reduce the cost and to raise the utilization rate of the mold.Finally,a comparative experiment is carried out to prove that the method can effectively reduce the mold cost under the time constraint of ensuring the delivery cycle.(2)In terms of internal transportation cost,aiming at the problem of high internal transportation cost caused by workers’ inability to balance component production according to construction site schedule,this paper established an optimization model of internal transportation cost under workshop constraints,and proposed a component scheduling method based on particle swarm optimization(component scheduling method based on particle swarm optimization,PSO-CSM).To minimize shipment cost as the goal,the method based on multiple order delivery cycle collection,solving the optimal component in transport planning,production scheduling scheme and components workers according to the regulations of component production scheduling plan arrangement of components in the stipulated time,the follow-up according to the component within the shipment plan transportation related artifacts to yard storage,adapt to the progress of the construction site at the same time reduce the transport cost.Finally,the comparative experiment proves that this method can effectively reduce the internal transportation cost under the workshop constraints.(3)Aiming at the problem of high mold cost and internal transportation cost,we designed and implemented a production scheduling system of prefabricated building components.The system supports users to choose optimization objectives and customize the relevant parameters and constraints.Its core module integrates multiple optimization objectives such as optimal mold cost,optimal internal transportation cost and shortest delivery time.The system also includes basic production line management,mold list management and other auxiliary business management modules.To help enterprises scientifically customize component scheduling schemes according to different optimization objectives.To sum up,from the perspective of component scheduling,this paper proposes an effective solution to the problem of high mold cost and internal transportation cost,and applies it to practice to build an prefabricated building component scheduling system.This has important practical significance for enterprises,which not only improves the data utilization rate of production workshop and the on-time delivery rate of customer orders,but also effectively improves the economic benefits of enterprises and expands the space for market development.