Abstract:

As the core of prefabricated construction projects， PC components are generally produced in the mixed production mode. In other words， several different types of components are produced on one production line at the same time. The current research is mostly based on the mixed production mode of the single production line. However， the mixed production mode of multiple production lines is often adopted in the actual production process of enterprises. Some scholars simply equate the mixed-flow production of multiple production lines with the parallel production mode of multiple machines， which ignores the functional difference among production lines. In consideration of the shortcomings of PC component production scheduling optimization research in the production scheduling of special-shaped component and non-special-shaped component assembly line， it is proposed to study the PC component production job assignment optimization problem under the mixed-flow production mode of multiple production lines. Firstly， according to the reality about the different production line models of special-shaped PC components and non special-shaped PC components as well as five objectives， such as production completion time， production cost and production line utilization， the PC component production assignment optimization model under the mixed production mode of multiple production lines is constructed. Then， in order to solve this kind of many-objective optimization problem， a MO-CGJaya/D algorithm is proposed. The algorithm is combined with chaos initialization and Gaussian mutation operation under the framework of decomposition strategy， which enhances the ability of the algorithm to jump out of local optimization and improves the solution efficiency at the same time. Through the DTLZ series function test as well as the comparison with NSGA Ⅱ algorithm， NSGA Ⅲ algorithm and MOEA/D algorithm， the performance of MO-CGJaya/D algorithm is verified. Finally， the survey data of a prefabricated component manufacturing enterprise is taken as an example. The MO-CGJaya/D algorithm is adopted to solve the model. Through the comparison with the existing production scheduling scheme based on the single machine scheduling model， it is showed that the model proposed in this paper can effectively help prefabricated component manufacturers arrange the job assignment of PC components reasonably and play a guiding role in the production practice of prefabricated component manufacturers.

Key words: PC components, multiple production lines, mixed-flow production, many-objective optimization, MO-CGJaya/D algorithm