| Disassembly of electromechanical products refers to the method of systematically separating parts,components,components or other sub-assemblies from products,the main purpose of which is to recover,repair and maintain product parts.For different purposes of disassembly,the disassembly sequence of products directly affects the disassembly efficiency and cost.Disassembly sequence planning is to find the optimal disassembly sequence from all feasible disassembly sequences of products,which is one of the key technologies of electromechanical product disassembly.The asynchronous parallel disassembly sequence planning and scheme evaluation technology of electromechanical products studied in this paper mainly includes the modeling method of asynchronous parallel disassembly of electromechanical products based on hybrid graph,the multi-objective optimization solution method of asynchronous parallel disassembly sequence of electromechanical products and the evaluation method of asynchronous parallel disassembly scheme based on partial order TOPSIS.The main contents of this paper are as follows:The first chapter introduces the domestic and international research status of disassembly sequence planning method and disassembly scheme evaluation of electromechanical products,analyzes the existing problems in the current research of disassembly sequence planning and disassembly scheme evaluation of electromechanical products,expounds the research background and significance of this paper,and gives the research content and organizational framework of this paper.In the second chapter,the problem of asynchronous parallel disassembly sequence planning of electromechanical products is described,and the information definition and expression method of asynchronous parallel disassembly of electromechanical products are proposed.The asynchronous parallel disassembly model of electromechanical products based on hybrid graph is constructed.The disassembly model of bevel gear reducer is established as an example,and the asynchronous parallel disassembly modeling method of electromechanical products based on hybrid graph is verified.In the third chapter,the objective function of asynchronous and parallel disassembly sequence planning is constructed,which takes the total disassembly time,the number of changes of disassembly direction and the number of replacement of disassembly tools as disassembly objectives.In this paper,the solving process of disassembly sequence based on INSGA-II multi-objective optimization algorithm is proposed,and the implementation methods of chromosome coding,population initialization,crossover,mutation and other operations in asynchronous parallel disassembly sequence problem are given.Taking bevel gear reducer assembly as an example,the multi-objective optimization method for asynchronous parallel disassembly sequence of electromechanical products is verified.Compared with NSGA-II algorithm,the multi-objective optimization method for asynchronous parallel disassembly sequence has comparative advantages in diversity and uniformity.The fourth chapter constructs the evaluation index system of asynchronous parallel disassembly scheme from two aspects of disassembly efficiency and disassembly cost.Based on the three indexes of total disassembly time,the number of changes of disassembly direction and the number of replacement of disassembly tools,the definition and calculation method of disassembly labor cost index under parallel disassembly are proposed.Entropy weight method is used to determine the specific weight value of each evaluation index of disassembly scheme,and the weight order of evaluation index of disassembly scheme is obtained.A disassembly scheme evaluation flow based on partial order TOPSIS is proposed.The partial order relation between disassembly scheme sets and corresponding Hasse diagram can be obtained only depending on the weight order.Taking the evaluation of the disassembly sequence of bevel gear reducer as an example,the evaluation method of asynchronous parallel disassembly scheme based on partial order TOPSIS is verified.The fifth chapter According to the research of modeling method of asynchronous parallel disassembly of electromechanical products based on mixed graph,multiobjective optimization solution method of asynchronous parallel disassembly sequence of electromechanical products,evaluation method of asynchronous parallel disassembly scheme based on partial sequence TOPSIS,the system of asynchronous parallel disassembly sequence planning and disassembly scheme evaluation of electromechanical products is developed,and the main function modules of the system are introduced.Taking the sequence planning bevel gear reducer assembly as an example,the system is verified.Chapter six summarizes the main research results and innovations of this paper,and looks forward to the future research direction of disassembly sequence planning of electromechanical products. |
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