輸送システムにおける走行距離に関する研究 : 第1報

抄録

Recently the importance of physical distribution system is emphasized, and Various research about it are studied. When comparing alternative physical distribution sytems on viewpoint of profitability, the distance of driving of trucks is one of the factors that mostly complicate the problem. When the total distance of driving required for carrying given goods is changed, the number of truck, driver and helper, etc., is changed too. It greatly influences the total cost of physical distribution system. On the other hand, because the total distance of driving is changeable by the other factors, such as the demand of goods, the period of supply, the size of truck, the way of dividing the delivery route of trucks, etc., it is rather difficult to infer it in advance theoretically. If it is able to infer the distance of driving simply with allowable error before adopt a new physical distribution system into practice, it is very convenient for examining the optimal physical distribution system. The purpose of this paper is to derive some approximate formula from which we could infer the distance of driving in advance, before adopted alternative physical distribution systems into practice. At first, the consideration of the shortest route on some typical models, such as radial type, join-2-points type, circle type, straight-line type, etc., instead of the delivery route of real world network has helped us to find out the common characteristrics about the distance of driving. Secondly, some approximate formula of the distance of driving on the real world network has been studied out by means of 'Go' Board model. Based on the experimental results with maps and actual data from one soft-drinking company, the degree of error of the approximate formula has been examined.