Grey Relation Entropy based Dynamic Evaluation Model of Product Lifecycle Information System Evolution

on its assumption product lifecycle information system is a dissipative structure, the product information model of different product lifecycle phase is regarded as the main research subject, and the time for establishing accurate and perfect product information model is regarded as the order parameter to describe the order and evolution direction of a system. The dissipative structure theory and grey system theory are applied to establish the determination model based on grey relation entropy and provide new evaluation methods for product lifecycle information system as well as theoretical foundation for system optimization design and adjustment. The model is applied in the evaluation of CAPP system evolution in a company. The feasibility of the evaluation method and the model is verified by the results. Product Life-cycle Information System (PLIS) is the result of IT and manufacturing development. The emergence and development of PLIS gives great impact on the development of manufacturing and its importance is widely recognized. But the benefit of PLIS can not completely acquit itself because it's very difficult to grasp the essence and discipline due to PLIS's complexity. Now it's very urgent for us to expound the basic character of PLIS and put out new theory to guide practice [1][2][3]. In this paper, dissipative structure theory, information entropy, synergetics theory and grey relation entropy are introduced into PLIS and the direction of system development is judged according to the relations between the entropy-reducing (or the entropy-increasing) and the sequence in the dissipative structure. The concept of " dissipative structure " is put forward by Prigogine. Prigogine and others pointed out that the open system which is far from equilibrium constantly exchanges substance and energy with the environment. When the parameter of the system change achieves a certain threshold, the state of the system will change abruptly from the disorder state or low order state to a new order state of time, space and function. The new macroscopically stable order structure is a dissipative structure. Dissipative structure needs four conditions: (1)The system must be open, that is to exchange substance and energy with environment;(2)System must be non-equilibrium, Prigogine points out " non-equilibrium is the source of order " ; (3) Factors of system exits nonlinear interaction mechanism; (4) System uses fluctuation from disorder to order. Since dissipative structure was founded, it has been widely used in many fields such as physics, biology, chemistry, economy, society, and obtains a series …