Lot Sizing And Scheduling Method Of Cabin Product And Its Application

This dissertation aims at the lot sizing and scheduling problems (LSP) which are always presented within the production of the Cabin products, and two kinds of LSPs which are the capacitated single-stage LSP and the capacitated multi-stage LSP are primarily researched in the thesis. Through the description and solution strategies analysis of the above two problems, an overall research framework of the lot sizing and scheduling optimization and the process management of the Cabin product is established.The LSP of key components of Cabin product belongs to the capacitated single-stage LSP. Compared with the common single-stage LSP, this problem has more constraints, such as multi-product production, multi-machine, capacitated and lot-size consideration. A complex gene with the information of the product numbers, machines and the periods is proposed. The full-space solution strategy is used to get the solution and it can satisfy the whole constraints. Then the validity of the method is proved by a case analysis.The LSP of the Cabin assembly production is a classic multi-stage LSP. Beside the constraint of single-stage LSP, the component precedence which is a specail constraint makes the problem more complex. Considering the objective function of minimum production cost, a mathematical model is established and solved by a rule-based heuristic method with two iterative layers. The above layer deals with the lot sizing calculation and the second schedules the jobs according to the above results. The validity of the algorithm is proved by analysis of the case data.Based on the above-mentioned theory, the process management is studied. For the production process control, material control and quality control in the process management situation, some methods are proposed. Then the process data, material information and quality data are collected and analyzed through these methods. As a result, the real-time monitoring of the production is realized and the plan is executed correctly. To facing the problem under a turbulence environment, a Bi-objective model is proposed taking into account the products cost and the new-old difference cost. Then the validity of this model is proved by a case analysis. Taking the example of Cabin product enterprise, a Manufacturing Execution System is developed to support the single-stage and multi-stage LSP simultaneously. The feasibility and practicability of the methods mentioned in this dissertation are proved through the successful implement in this enterprise.At last the research work is concluded and the future research efforts are proposed.