不確定環(huán)境下模具制造車間前攝與反應(yīng)式調(diào)度方法研究
[Abstract]:Die is an important part of equipment manufacturing industry. The level of mold production has become an important symbol to measure the level of a country's product manufacturing. Not high, manufacturing cycle is generally too long, the order delivery delay is a serious restriction on the international competitiveness of China's mold enterprises three key factors. The main reason is the lack of an effective production control method to adapt to the characteristics of mold manufacturing.
The resource-oriented ordering mode of one-piece engineering makes the mold manufacturing process full of a lot of uncertainties, which makes it difficult for the mold workshop to make a reasonable and feasible operation plan. Therefore, it is necessary to take effective precautionary measures, as well as reasonable rescheduling methods and control strategies to ensure that the production plan is completed on time and on time.
In this paper, the problem of forward and reactive scheduling in mold manufacturing workshop under uncertain environment is studied under the joint support of National Natural Science Foundation (50675039, 50875051) and National 863 Program (2006 AA04Z132). According to the characteristics of mold manufacturing cell, the uncertain factors are analyzed and modeled, and the uncertain environment is discussed in detail. The decision-making mechanism and the rescheduling driving mechanism of the mold manufacturing workshop are established, and the relevant scheduling model and solving algorithm are established.
The main work of this paper includes the following aspects:
1. The mould production organization structure with the main key parts as the control pointer is put forward, and the flexible flow shop model of the mould under the uncertain environment is established. The mathematical models are established for three main uncertainties. Finally, the forward and reactive scheduling framework of the mould manufacturing workshop is proposed.
2. Based on the discrete probability model of man-hour, the time combination is analyzed. On this basis, a proactive scheduling model with maximum stability as the optimization objective is proposed, and a variable-width clustering search algorithm is proposed.
3. The concept of process delay is defined, and the calculation method of cumulative process delay is proposed. Aiming at the influence of implicit and explicit uncertainties in flexible flow shop, a reactive scheduling mechanism based on cumulative delay and event-triggered hybrid drive is proposed. A simulation model based on Plant Simulation is established and analyzed. Compared with periodic rescheduling and event-driven rescheduling, the results show that the hybrid mechanism can achieve lower reactive scheduling frequency, and can maintain good scheduling performance in the case of high insertion frequency.
4. Based on the above scheduling metrics, a two-stage reactive scheduling model for flexible flow shop is proposed, which includes two stages: local repair scheduling and reactive scheduling. As the primary consideration, the machining sequence of the workpiece on the machine is unchanged, and the processing time of the affected process is delayed on the time axis. The constrained propagation tree is used to represent the local repair algorithm of the affected process. The local repair algorithm under the condition of machine failure and urgent single insertion has certain advantages.
5. After the scheduling scheme is solved by local patching algorithm, an evaluation model is set up to assist the dispatcher in decision-making, including the analysis of tardiness and the analysis of tardiness penalty cost. A two-objective reactive scheduling model with validity and stability is proposed. Combining non-dominated scheduling based on Euclidean congestion distance with elite archiving strategy based on clustering algorithm, an improved multi-objective genetic algorithm is proposed to solve the reactive scheduling model. The simulation results are compared with the NSGA-II algorithm. The simulation results show that the proposed algorithm is effective and stable. By using non-dominated sorting based on Euclidean congestion distance, the non-inferior solutions obtained by MMOGA algorithm are more uniform than those obtained by NSGA-II algorithm and closer to the approximate Pareto optimal front-end.
6. The hierarchical coordination control mode of enterprise basic business process and production plan is analyzed, the function modules and database of the system are designed, and a set of decision support system for flexible flow shop scheduling is developed, which is used to assist production production coordination to coordinate the activities of the whole production shop, respond to emergencies in time and is effective in application. Good fruit.
【學位授予單位】:廣東工業(yè)大學
【學位級別】:博士
【學位授予年份】:2013
【分類號】:TP301.6;TH186
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