Closed-loop Scheduling in a canned food factory

Integrating Continuous and Batch Processes with Shared Resources in Closed-Loop Scheduling: A Case Study on Tuna Cannery

“…In the case that such an effect of processing-time increment due to concurrent-steam consumption is nonlinear but can be represented by a convex relationship, a piecewise linear approximation of desired accuracy can be set up via the intersection of N inequalities t h ≥ ξ + n h ξ i + β i , i = 1, ..., N , in order to preserve the model linearity. A combination of such constraints with the minimization of the objective function (e.g., the makespan) would provide a tight solution, analogous to what was proposed by the authors to integrate scheduling and control via Pareto frontiers.…”

“…Instead of such approaches that assume changes in the sterilization profiles are either negligible or forbidden, the authors propose to integrate the decisions on the operation of the sterilizers with the real-time scheduling to better fulfill the overall planning aims. 28 In this regard, a sensible idea is to model the changes that overlapping sterilizations may produce in the time−temperature profiles during the come-up stage. This idea is formulated and expanded along the next sections, also providing validation results once the scheduling is implemented onsite in the cannery.…”

Gemelos Digitales en la Industria de Procesos

“…No obstante, este planteamiento está variando ante la necesidad de tener en cuenta la dinámica de los procesos y la producción en tiempo real, así como la necesidad de adaptarse rápidamente a los cambios y demandas externas. En este sentido, se plantean, tanto la necesidad de nuevas formulaciones en la actualización de modelos ya comentadas, como la implantación de métodos de integración del RTO y el MPC (de Prada et al, 2017) en lo que se conoce como MPC económico (eMPC) (Engell and Harjunkoski, 2012) o formulaciones recientes de scheduling en línea (Palacín et al, 2020).…”