A Multi-objective Flexible Scheduling Method for Steelmaking and Continuous Casting Process

Abstract

The invention discloses a multi-objective flexible scheduling method for a steelmaking and continuous casting process. The method comprises a step of constructing an uncertain steelmaking-continuous-casting scheduling model and obtaining an input parameter value from a steel mill MES database to form an offline scheduling optimization problem, a step of determining an initial population, defining a multi-target reference point based on the preference of a decision maker and transforming a multi-objective optimization problem into a single-objective optimization problem, a step of carrying out iterative optimization on the initialized population by using a chemical reaction optimization algorithm according to the transformed objective function to obtain a candidate scheduling scheme set.In the iterative optimization process, a T test method based on random simulation is used to roughly sort and select a current population, and a knowledge-based neighborhood search strategy is used toimprove the convergence performance of the chemical reaction optimization algorithm. Finally, an optimal scheduling scheme is obtained by using an accurate sorting and selection strategy based on anindifference zone. According to the method, the optimization of multiple target expectation values including an average waiting time, a casting break time penalty and waiting time crossing penalty isachieved.

Description

technical field [0001] The invention belongs to the fields of automatic control, information technology and advanced control, and specifically relates to a multi-objective flexible optimal scheduling algorithm for uncertain steelmaking-continuous casting production scheduling problems in the process of complex constraints and strong uncertainty workshop scheduling. Background technique [0002] The steelmaking-continuous casting process is the key and bottleneck link in the iron and steel production process. A typical steelmaking-continuous casting production process mainly includes the following three processes: (1) Steelmaking process: high-temperature molten iron or scrap steel is smelted into molten steel with reduced carbon content in a converter (BOF) or electric furnace (EAF); (2) Refining Process: Liquid molten steel is loaded into ladles, transported to refining workstations (such as LF, RH, VD, etc.) by idle driving for secondary smelting, so that the temperature a...

AI Technical Summary

Problems solved by technology

However, since the steelmaking-continuous casting process is a complex manufacturing process with both discrete and continuous processing characteristics, and is accompanied by complex physical and chemical changes, the steelmaking-continuous casting production process is easily affected by the external environment, machine status, operating experience and The influence of factors such as raw material level

Since the processing machine and start time of each workpiece are "hardly" stipulated, the traditional steelmaking-continuous casting scheduling scheme is easily affected by various random disturbances, making it difficult to guarantee the optimality and feasibility of the initial scheduling scheme

Images