Comments on “New General Continuous-Time State−Task Network Formulation for Short-Term Scheduling of Multipurpose Batch Plants” by Christos T. Maravelias and Ignacio E. Grossmann and on “Enhanced Continuous-Time Unit-Specific Event-Based Formulation for Short-Term Scheduling of Multipurpose Batch Processes:  Resource Constraints and Mixed Storage Policies” by Stacy L. Janak, Xiaoxia Lin, and Christodoulos A. Floudas

2005 ◽  
Vol 44 (6) ◽  
pp. 1985-1986 ◽  
Author(s):  
Christodoulos A. Floudas ◽  
Stacy L. Janak
Keyword(s):  
Continuous Time ◽  
Resource Constraints ◽  
Batch Processes ◽  
Short Term ◽  
Batch Plants ◽  
Specific Event ◽  
Event Based

scholarly journals Unit-Specific Event-Based and Slot-Based Hybrid Model Framework with Hierarchical Structure for Short-Term Scheduling

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Yue Wang ◽  
Hongye Su ◽  
Hanshan Shao ◽  
Lei Xie
Keyword(s):  
Hybrid Model ◽  
Hierarchical Structure ◽  
Continuous Time ◽  
Production Scheduling ◽  
Lower Layer ◽  
Short Term ◽  
Model Framework ◽  
Time Model ◽  
Specific Event ◽  
Event Based

Unit-specific event-based continuous-time model has inaccurate calculation problems in involving resource constraints, due to the heterogeneous locations of the event points for different units. In order to address this limitation, a continuous-time unit-specific event-based and slot-based hybrid model framework with hierarchical structure is proposed in this work. A unit-specific event-based model without utility constraints is formulated in upper layer, and a slot-based model is introduced in lower layer. In the hierarchical structure, the two layers jointly address the short-term production scheduling problem of batch plants under utility consideration. The key features of this work include the following: (a) eliminating overstrict constraints on utility resources, (b) solving multiple counting problems, and (c) considering duration time of event points in calculating utility utilization level. The effectiveness and advantages of proposed model are illustrated through two benchmark examples from the literatures.

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