Abstract:

In order to measure the order of a manufacturing information system , the relationship between the orderdisorder degree of the system and the manufacturing information is studied in this paper. In the investigation , the manufacturing information is divided into 5 layers including the equipment information in workshop , the manufacture executive information , the flow management information , the bùsiness decision information and the strategy decision information. And , the respective grading standards for the absolute information value and the information importance of manufacturing information are defined according to the 5 layers. Then , the uncertainty value of manufacturing information is obtained according to Shannon 's Information Theory , which is then combined with the two grading standards proposed above to assess the absolute information value of each information item. Moreover , the absolute information values are combined with the relative coefficient between two information items to determine the independent information value of each information item. The sum of all independent information values forms the total information value of the manufacturing information system. In addition , according to the total information value and its maximum and mllllmum in extreme conditions , a parameter named the system order degree is defined to evaluate the order-disorder of the manufacturing information system , which is finally used in practice , with a linear correlation to the order of the manufacturing information system.

Key words: manufacturing system, information system, order-disorder, measurement theory