Branch-and-Cut方法及其在物流時空調度中的應用研究
[Abstract]:The problem of logistics time and spatial scheduling in manufacturing and logistics systems can be attributed to the integer programming problem..Branch-and-Cut algorithm is one of the most effective algorithms to solve the problem of integer programming. The basic idea is to use the framework of the branch and bound algorithm to increase the effectiveness of the leaf nodes in the branch and bound tree. The equation is used to dynamically elevate the lower bound (minimization problem) to reduce the number of branches of the branch and bound tree and improve the efficiency of the algorithm. As the integer programming problem is most of the NP- problem, it is of great significance to study the improvement of the Branch-and-Cut algorithm for the improvement of the scale and efficiency of the optimal solution of integer programming. Taking the typical crane scheduling problem in the time scheduling of logistics system as the background, the method of Branch-and-Cut algorithm is studied. The application of the method is studied with the factory crane scheduling as the background. Then, with the background of the classic graph coloring problem in the graph theory, the method of Branch-and-Cut calculation is studied, and the space of the logistics system is used. The main work of the paper and the research results are summarized as follows: 1) the scheduling problem of typical crane: for the M crane to complete the known N (MN) task, it is necessary to determine the assignment of the task on the crane and the order of execution on the distributed crane. The priority relation between the tasks of the crane and the avoidance of crossover and collision between the cranes, the shortest time needed to complete the complete task is made. The integer linear programming model of this problem is solved by Branch-and-Cut algorithm. An effective inequality based on the analysis of the problem characteristics is proposed, and an improved taboo based on the taboo is designed. The separation strategy of the search method is used for the discovery of effective inequalities. The results of the numerical experiment show the effectiveness of the proposed algorithm.2) the scheduling problem of the slab crane crane: the continuous (uninterrupted) outgoing operation of each work piece is defined as a task for the output of the N (MN) workpieces by the M crane. The distribution and execution order of the interruption and all tasks on the crane, in order to satisfy the completion order, avoid the intersect and collision between the hoists and the requirements of the service rules of the buffer stacks, make the completion time of all the tasks short. Row reconstruction. Based on the reconstruction model with tight lower bounds, the Branch-and-Cut algorithm is designed. In the implementation of the algorithm, a multi class effective inequality is proposed to improve the lower bounds of the problem. At the same time, the introduction of variable reduction technology is introduced to effectively reduce the search domain and improve the search efficiency. Numerical experiments based on industrial actual data prove that It is proposed that the algorithm can obtain the optimal solution of the scale of the industrial problem in a reasonable time, its performance is obviously superior to the commercial optimization solution software CPLEX, validates the validity of the proposed model and algorithm.3) the typical graph theory optimization problem - the graph coloring problem: a color for each vertex in a given graph is guaranteed to be arbitrarily connected. At the request of different colors, the least number of colors required by the decision is required. An integer linear programming model is established for the problem. The optimal solution of the Branch-and-Cut algorithm is designed. A variable fixed strategy is proposed to reduce the feasible domain and constructs an effective inequality based on dynamic programming. The effective inequalities of the erect set, based on the effective inequality of the regiment, effectively improve the convergence speed of the Branch-and-Cut algorithm. The experimental results of the Benchmark standard test data show the effectiveness of the proposed algorithm.4) based on the graph coloured slab entry position decision problem: the slab storage for the slab library needs decision storage Position position, in order to ensure that the slab is extracted in the order of out of the storehouse, does not produce the reverse stacking operation, which makes the occupying digits least. The problem is modeled by the graph coloring problem, and the storeboard is defined as the vertex, the slab is defined as the edge, and the stack of the same stacks is defined as the point in the same color. The minimum occupancy of the stacking number corresponds to the least used color number. The model of the slab storage position decision problem established by the graph coloring problem can be solved directly by the proposed Branch-and-Cut algorithm. The numerical experiment shows that the problem is based on the validity of the graph coloring modeling method.5) in a large steel enterprise in China. In the background of slab storehouse logistics operation, the logistics optimization decision support system of slab storehouse is developed based on the scheduling problem of slab hanger crane and the model and algorithm of slab storage staging decision problem. The application verification of actual data shows that the performance of the developed model and algorithm is superior to the popular commercial software and hand. The manufacturing method of the industrial editor.
【學位授予單位】:東北大學
【學位級別】:博士
【學位授予年份】:2015
【分類號】:F402;F252;TP301.6
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