Combined System Reduction and Sequencing in Complex System Optimization

Author(s):  
Kenneth English
2011 ◽  
Vol 261-263 ◽  
pp. 753-756
Author(s):  
Hua Meng ◽  
Hua Wang ◽  
Jian Jun Wang

The techno-interface of BF-BOF region is an important stage that connects iron making procedure with steel making procedure in the production line, acting as a connecting link between the preceding and the following procedure. It is also the key region to optimize the iron making and steel making process as a whole. In this paper, based on queuing theory method for BF-BOF region simulation, a static simulation method is presented to realize the simulation of dynamic system, WITNESS is used to simulate the M/M/1 queue model. The number of different transportation ladles has been analyzed to influence the BF-BOF region, the best ladles were obtained in order to improve production rate. The results show that the modeling method can reflect the complex system characteristics of BF-BOF region and provide the advice for system optimization.


2021 ◽  
Vol 1 (48) ◽  
pp. 188-202
Author(s):  
Lomotko D ◽  
◽  
Krasnoshtan O ◽  

The article proposes an approach to improving the structure and parameters of complexes for the organization of cargo exchange of piggyback trains using the approach of complex system optimization. The object of study - the process of piggyback transport, methods and approaches to increase its efficiency and speed. The purpose of the work is to determine the methods of improving the efficiency of piggyback transportation and their flexibility in order to adapt its parameters to the needs of customers. Synthesis of methods to increase the flexibility of the piggyback transport system while maintaining consistently high rates of carrying capacity and speed of goods delivery. Research method - system analysis and complex structural-parametric optimization. The organization of piggyback transportation is one of the elements of improving the efficiency and balance of the country's transport system. From the point of view of customer needs, the piggyback system should be flexible, while providing conditions for high transport capacity and speed. To do this, it is necessary to solve a number of problems that would allow the exchange of piggyback trains on the way, without allowing the deterioration of other parameters of the system - mainly performance and speed. The most effective approach to solving these problems is to use the methodology of directed synthesis of complex systems. The peculiarity of this methodology is that it allows you to reach the predefined parameters of a complex system. The synthesized structure of the terminal to ensure highly efficient high-speed freight exchange in the organization of piggyback transport allows piggyback freight exchange at intermediate stations of their route in a minimum time without significantly reducing the route speed and carrying capacity of the system. KEYWORDS: PIGGYBACK TRANSPORTATION, FREIGHT TERMINALS, DIRECTED SYNTHESIS OF SYSTEMS.


2006 ◽  
Vol 129 (9) ◽  
pp. 898-906 ◽  
Author(s):  
James T. Allison ◽  
Michael Kokkolaras ◽  
Panos Y. Papalambros

Design of complex products with several interacting subsystems or disciplinary analyses poses substantive challenges to both analysis and optimization, necessitating specialized solution techniques. A product or system may qualify as complex due to large scale or due to strong interactions. Single-level strategies for complex system optimization centralize decision-making authority, while multilevel strategies distribute the decision-making process. This article studies important differences between two popular single-level formulations: multidisciplinary feasible (MDF) and individual disciplinary feasible (IDF). Results presented aim at aiding practitioners in selecting between formulations. Specifically, while IDF incurs some computational overhead, it may find optima hidden to MDF and is more efficient computationally for strongly coupled problems; further, MDF is sensitive to variations in coupling strength, while IDF is not. Conditions that lead to failure of MDF are described. Two new reproducible design examples are introduced to illustrate these findings and to provide test problems for other investigations.


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