制造信息系统的有序性测度理论研究

为了测度制造信息系统的有序性,研究了制造信息系统的有序程度与制造信息之间的关系.首先将制造信息分为车间设备信息、制造执行信息、流程管理信息、业务决策信息和战略决策信息5个层次,并根据制造信息所在的层次定义了制造信息绝对信息量的评分标准及同一层次内部信息重要性的评分标准;然后采用Shannon的信息论计算制造信息的信息量,并结合前述的两个评分标准计算每个信息的绝对信息量;再结合制造信息量之间的相关性系数,确定各个制造信息的独立信息量.制造信息系统中所有独立信息的总量就是制造信息系统的信息总量;另外,当制造信息系统处于极端条件下时,其信息总量会出现最大值与最小值,根据这三个值,文中找到了评价制造信息系统有序性的参数并称之为系统有序度Θ(t).使用系统有序度Θ(t)来测度制造信息系统的有序性时,系统有序度越大,制造信息系统的有序性越高.

Order-Disorder Measurement Theory of Manufacturing Information System

In order to measure the order of a manufacturing information system,the relationship between the order-disorder 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 business 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 minimum 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.