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A novel mathematical optimisation model for the scheduling of activities in modular construction factories

机译：模块化建筑工厂活动调度的新颖数学优化模型

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Modular construction has been reported to lead to a number of advantages when contrasted with conventional construction approaches, including time and cost savings, along with reduced environmental impacts. Given that the operations involved in modular construction take place within a controlled environment, an integral factor that impacts the productivity of works involved is the timely scheduling of the associated activities. Unlike conventional on-site construction methods, operations in modular construction take place in a sequential and linear manner, with large dependence on adequate resource allocation to specific workstations. In a bid to address the lack of mathematical optimisation methods that target the scheduling of operations in a modular factory setting, this paper proposes a novel mixed integer non-linear programming model for optimising the scheduling of modular construction activities on the shop floor of modular factories. The impact of scheduling of resources, such as overhead cranes, and the distance between stations to which activities are scheduled are factored in the proposed method. The solution approach presented for solving the scheduling problem involves the linearisation of the model to enable the use of efficient off-the-shelf solvers. A realistic case study is implemented, and an extensive computational experiment is also conducted to test the robustness and tractability of the proposed method. The performance of the model is also contrasted with a commonly adopted heuristic, with the model producing project durations reductions that are 43% less than that of the heuristic.
机译：据报道，模块化结构导致了与传统施工方法对比时的许多优势，包括时间和成本节约，以及对环境影响降低。鉴于模块化结构中涉及的操作在受控环境中发生，这是影响所涉及的工作效率的一体因素是及时安排相关活动。与传统的现场施工方法不同，模块化结构的操作以顺序和线性的方式发生，对特定工作站的充分资源分配具有很大的依赖性。在一个出价中，解决了模块化出厂设置中运行调度的数学优化方法，提出了一种新颖的混合整数非线性规划模型，用于优化模块化工厂车间模块化施工活动的调度。调度资源的影响，例如架空起重机，以及在提出的方法中对活动的站点之间的距离。求解调度问题的解决方案方法涉及模型的线性化，以使得能够使用高效的现成求解器。实施了一个现实的案例研究，还进行了广泛的计算实验，以测试所提出的方法的稳健性和易腐蚀性。该模型的性能也与普通采用的启发式形成鲜明对比，该模型产生的项目持续时间减少43％，而不是启发式。

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