Application of case-based reasoning-Tabu search hybrid algorithm for rolling schedule optimization in tandem cold rolling

Abstract

Purpose The purpose of this study is to improve the global optimization ability of the Tabu search (TS) algorithm, and then improve the calculation efficiency and accuracy of rolling schedule in tandem cold rolling. Design/methodology/approach A case-based reasoning–Tabu search hybrid algorithm (CBRTS) has been presented. First, the case-based reasoning technology was adopted to obtain high-quality initial solution and then the TS algorithm was used for global optimization. Findings The optimization effect of CBRTS is compared with that of the traditional TS algorithm, and the analysis result indicates that the CBRTS has a faster convergence rate than TS, and the optimization results are closer to the global optimal. Meanwhile, the rolling schedule calculated by CBRTS is more reasonable, which can increase the production efficiency while giving full play to the capacity of equipment. Originality/value A CBRTS hybrid algorithm is presented. The strong dependence of the TS algorithm on the initial solution has been solved. The rolling schedule multi-objective optimization functions are established. The proposed algorithm is applied in a 1,450-mm tandem cold rolling production line. The improved method can reduce about half the iterations compared with the traditional one.

Hybrid Dynamic Pricing Model for Transport PPP Projects during the Residual Concession Period

“…It means that these pricing mechanisms exist without scientific rules due to the lack of theoretical foundations and changing parameters. In contrast, CBR is based upon shallow knowledge and does not require significant efforts in knowledge engineering (Bu et al 2018). This creates an ideal environment for the adoption of CBR in PPPs' pricing as it relieves the burden of lengthy analysis of the problem domain and improve efficiency and quality of PPPs' pricing (Feng et al 2006).…”

“…To fill this gap, this study aims to address the following research question: "How can a dynamic concession price be determined in transport PPPs during the residual concession period?" Acknowledging that the varying trend of these parameters affecting the concession price can be depicted through similar projects, Case-based Reasoning (CBR) approach is used to acquire knowledge on residual concession price determination (Bu et al 2018;. Specifically, determination of concession price during the residual concession period comprises: (1) constructing the concession pricing model at the end of the concession period through Cost Benefit Analysis (CBA);…”

Multi-Objective Optimization of Rolling Schedule for Five-Stand Tandem Cold Mill

“…They used the genetic algorithm to optimize the cost function and achieved a good result. The case-based reasoning-Tabu search hybrid algorithm was proposed to optimize the rolling schedule in tandem cold rolling in [5]. The improved iterative method reduced the number of iterations by about half compared with the ordinary tabu search algorithm.…”