Study On The Optimization Of Plant Logistics Under Jit Philosophy Based On Resource Demand

Nowadays, all passenger vehicle companies have been paying more and more attentions on the logistics research which is known as the third profit source. In the 21st century, China has gradually become a global automobile manufacturing and consuming country. The automobile industry has entered an unprecedented era of intense competition. In the fierce competition, how to reduce logistics costs, especially the cost of plant logistics can become an important condition for victory.At the present stage, automobile manufacturers often subcontracted plant logistics to a professional third-party logistics company. However, most companies have not yet established a complete technical analysis model for in the factory warehouse and distribution system. The factors such as personnel, equipment, practices and other changes can not be timely adjusted according to production plan. And also, it is impossible to provide accurate technical support for business expanding.In this paper, based on previous studies, we made Comprehensive investigation on the plant logistics in the Dongfeng Nissan Passenger Vehicle Company. We made great research on the demand of logistics resource and the assembly line feeding system. Based on the actual operation of the enterprise, the research established Mathematical models to calculate the demand of logistics resource. With the help of programming and computer technology, we made a comprehensive study on macro and micro aspects. The workflow analysis method was adopted to analyze the pattern of equipment and workforce needed in the plant logistics system based on the field study of a vehicle factory. A mathematics model based on manufacturing plan, parts demand, packaging volume, and process analysis was established to quantify the labor intensity, and estimate the equipment and workforce capacity of each process in the multi-model assembly line feeding systems. Finally, in visual studio environment, by using the C # programming language, a numerical example was used to validate whether the model was meaningful.In the study of assembly line feeding problem, the paper made an analysis of the workstation layout and process flow. We found that the logistics route in the assembly shop was complex and the line side inventory was limited. According to the fixed parts and workstation, the paper built assembly-line feeding model, with time windows limit to estimate which and how many parts should be feed to the assembly line on each cycle. Finally , through the heuristic algorithm, combined with the programming technology, a numerical example to verify the validity of the model and algorithms.