A Hybrid Simulation Model for the Allocation of Shared Resources in a Project Portfolio
提出一种结合系统动力学和离散事件仿真的混合模型，同时考虑项目和组合层面的收益，帮助项目组合管理者优化共享资源分配。
To reasonably allocate shared resources (SRs) in project portfolios (PP) and realize PP's maximal benefits, this research proposes a hybrid SRs allocation model based on system dynamics (SD) and discrete event simulation (DES). Unlike previous resource allocation methods that solely consider project level benefits, the proposed model simultaneously considers the benefits at both project and portfolio levels. Specifically, starting from the project activity level, we first construct a project schedule evaluation sub model using DES; Second, a synergy benefit evaluation sub model at portfolio level is constructed by considering both the positive and negative benefits brought by SRs allocation using SD; Finally, by clarifying the connection between the two sub models, a hybrid simulation model for SRs allocation is obtained. A case study is used to demonstrate the practicality of the hybrid model. Sensitivity analysis is then conducted to examine how the model output changes due to variations in parameters. The proposed model is also compared with DES model to demonstrate the superiority of the hybridization. Simulation results reveal that the proposed model can systematically integrate the effects of SRs allocation at both project and portfolio levels, which provides PP managers a tool to enhance SRs allocation performance.