An Integer Linear Programming Model for the Multiperiod Production Planning of Precast Concrete Beams

The integrated cutting and packing heterogeneous precast beams multiperiod production planning problem

“…Regarding the C&P problems and optimization approaches in precast production, [6] described the problem of minimizing production costs for slabs of precast prestressed concrete joists and introduced a genetic algorithm to solve it. An integer linear programming model for multiperiod production planning of precast concrete beams was proposed in [16], which can be seen as a special case of the HPBMPP. In [2], the authors introduced a mathematical model for the cutting stock/leftover problem and suggested a column generation technique for finding the problem's linear relaxation solution.…”

“…In this section we present computational experiments on a set of benchmark instances that were produced with the intent to mimic real-world scenarios, in order to evaluate the solution methods proposed in this study. The instances used in this work were randomly generated based on an existing order arising from a real-world production plant [1,16]. For privacy reasons, we are not allowed to use or provide here the actual data coming from the aforementioned instance.…”

Layout Optimization Model for the Production Planning of Precast Concrete Building Components

“…Hong and Lee developed algorithms that could promptly establish a production layout plan by considering in situ production factors affecting composite precast concrete members [17]. Prata et al proposed a model based on integer linear programming to schedule the production of the beams so as to minimize the losses in a minimal time by taking into account the constraints inherent in the forms and beams [18]. Yang et al proposed a flow shop scheduling model of multiple production lines for precast production and developed an optimization approach to facilitate optimized scheduling by using genetic algorithm [19].…”

“…The first category focuses on optimizing the specific process for various distinct precast production methods, such as the roll-cutting process of the filigree wide-slab method [18] and the layout process of composite precast concrete members for precast concrete in situ production [17]. The second category focuses on traditional precast production methods for optimizing the production plan based on the job shop/flow shop scheduling problem [12][13][14][15][16]19], which mainly emphasize the flow variability between processes under special constrains such as limited labor and mold [14].…”

Propuesta de mejora de procesos en la fabricación de marcos en una empresa de manufactura

“…En este caso, el objetivo es el mejor uso posible de los recursos disponibles para minimizar los costos totales por unidad de producto en lugar de minimizar el tiempo de ciclo o el número de estaciones. 32 Las líneas de ensamblaje consisten en estaciones sucesivas en las cuales las unidades se mueven continuamente a través de las estaciones para ser ensambladas. Las estaciones se definen como los lugares donde se realizan ciertas tareas en los productos.…”