Related PapersThe increased use of precast components in building and heavy civil engineering projects has led to the introduction of innovative management and scheduling systems to meet the demand for increased reliability, efficiency and cost reduction. The aim of this study is to develop an innovative crew allocation system that can efficiently allocate crews of workers to labour-intensive repetitive processes. The objective is to improve off-site precast production operations using Multi-Layered Genetic Algorithms. The Multi-Layered concept emerged in response to the requirement of modelling different sets of labour inputs. As part of the techniques used in developing a Crew Allocation " SIM_Crew " System, a process mapping methodology is used to model processes of precast concrete operations and to provide the framework and input required for simulation. Process simulation is then used to model and imitate all production processes and Genetic Algorithms (GAs) are embedded within the simulation model to provide a rapid and intelligent search. A Multi-Layered chromosome is used to store different sets of inputs such as crews working on different shifts and process priorities. A 'Class Interval' selection strategy is developed to improve the chance of selecting the most promising chromosomes for a further investigation. Multi-Layered Dynamic crossover and mutation operators are developed to increase the randomness of searching mechanism in the solution space. The results illustrate that adopting different combinations of crews of workers has a substantial impact on the labour allocation cost and this should lead to increased efficiency and lower production cost. In addition, the results of the simulation show that reduced throughput and process-waiting times and improved resource utilisation profiles can be achieved when compared to a real-life case study. This paper presents an innovative approach to solve complex crew allocation problems in any labourintensive industry. This has been achieved by combining simulation with a Genetic Algorithm (GA). The integrated system determines the least costly and most productive crews to be allocated on any production process. Discrete Event Simulation methodology is used to simulate a manufacturing system. The concept of a multi-layer chromosome is proposed to store different data sets in a multilayer structure. GA operators ... Numerous different combinations of crew alternatives can be deployed within a labour-intensive manufacturing industry. This can therefore often generate a large number of possible crew allocation plans. However, inappropriate selection of these allocation plans tends to lead to inefficient manufacturing processes and ultimately higher labour allocation costs. Thus, in order to reduce such costs, more allocation systems are required. The main aim of this study is to develop a simulation-based multi-layered simulated annealing system to solve crew allocation problems encountered in labour-intensive parallel repetitive manufacturing processes. The ‘multi-layered’ concept is introduced in response to the problem-solving requirements. As part of the methodology used, a process simulation model is developed to mimic a parallel repetitive processes layout. A simulated annealing module is proposed and embedded into the developed simulation model for a better search for solutions. Also, a multi-layered dynamic mutation operator is developed to add more randomness to the searching mechanism. A real industrial case study of a precast concrete manufacturing system is used to demonstrate the applicability and practicability of the developed system. The proposed system has the potential to produce more cost-effective allocation plans, through reducing process-waiting times as compared with real industrial-based plans. Iba pang mga katanungan: Music What is the texture? a. monophonic b. homophonic c. polyphonic Kabuuang mga Sagot: 1 What filipino characteristic is shown through the making of filipino indigenous instrument? Kabuuang mga Sagot: 1 Music, 19.11.2019 18:28, joviecar Claude debussy and maurice ravel similarities? Kabuuang mga Sagot: 1 What is the time signature of santa clara Kabuuang mga Sagot: 1 Do you know the correct answer? 30. Pre-casting is most useful as a casting strategy when a director is filling a role that requires... Questions in other subjects:English, 28.06.2021 07:25 Filipino, 28.06.2021 07:25 English, 28.06.2021 07:25 Araling Panlipunan, 28.06.2021 07:25 Araling Panlipunan, 28.06.2021 07:25 Araling Panlipunan, 28.06.2021 07:25 Araling Panlipunan, 28.06.2021 07:25 |
Precasting is most useful as a casting strategy when a director is filling a role that requires
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