Multi-objective Balancing And Optimal Scheduling For Project Management Under Resource Constraints

The regional heterogeneity and scheduling asynchronous nature of assembly projects make it difficult for project managers to schedule and optimise different construction resources such as manpower and equipment for prefabricated buildings in order to obtain reasonable durations and costs.The aim of this paper is to address the problem of balancing cost,duration and resources for prefabricated buildings under resource constraints.The research is based on the fact that there is only one execution mode for a process,i.e.only one fixed resource input and fixed duration,whereas in the actual project scheduling process,there are generally multiple execution modes for a process,i.e.multiple resource inputs and variable durations.At the same time,in view of the multi-dimensionality and multi-association of the assembly construction operation space,the classical resource-constrained project scheduling theory is combined with a multi-spatial dimensionality reduction technique in the model processing part to transform the multi-spatial non-synchronous scheduling problem of assembly construction into synchronous scheduling and establish a multi-modal resource-constrained project scheduling model with the assembly construction space.This paper provides project management with multi-faceted decision-making advice and solutions from the perspectives of schedule,cost and resource balance single-objective optimisation models and applications and multi-objective applications and trade-offs,respectively,to provide a comprehensive and effective management scheduling plan.The main research results of this paper are as follows:(1)The characteristics and difficulties encountered in the universal construction process of assembly buildings are analysed,and the work contents of the prefabricated buildings production space,transport scheduling space and assembly component space are moved to the same time period,compressing the asynchronous scheduling serving the same construction unit in different time periods into synchronous scheduling,effectively solving the scheduling problem of multi-space asynchrony.(2)Considering the existence of independent decision makers of different professions in the actual project team,single-objective optimisation models for duration,cost and resource balance were established and applied to the actual project to provide construction scheduling references for construction managers,cost officers and material officers,and to provide acceptable solution directions within a reasonable period of time when project risks are encountered.When applied to actual projects,it was found that the single-objective optimisation scheme can only be used as a technical reference,not as a global management solution,and that the use of a single-objective scheduling scheme is uneconomic and limiting for project management.(3)Considering that single-objective decision-making cannot provide a globally optimal solution,an prefabricated building scheduling model from the perspective of a schedule-cost-resource balance multi-objective trade-off is established.It also incorporates a fast non-dominated ranking algorithm and a congestion comparison strategy to solve the model based on the MOCS algorithm;verifies through the PSPLIB standard algorithm that the MOCS algorithm has more diverse and more widely distributed solutions than the MOPSO algorithm for optimising the multi-objective problem of resource-constrained project scheduling;further verifies with practical cases that the proposed model and algorithm can reasonably schedule the resources and duration of the project The proposed model and algorithm can be used to further validate that the proposed model and algorithm can reasonably schedule the resources and duration of a project,and incorporate the results of single-objective optimisation into a comparative analysis.