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Articles by Lu Wei
Total Records ( 3 ) for Lu Wei
  Zhang Hua , Lu Wei , Yang Jianhua , Sheng Shengqiang and Guo Huibin
  Main steam of the power plant is typical great inertial and long-time delay component. The dynamic characteristic of main steam temperature is greatly changed when load of the boiler varies. Traditional Proportional Integral Derivative (PID) control and fixed model predictive functional control neither can’t get satisfying control effect such as lower control precision, higher fluctuation of temperature and so on. In this study, the multi-model predictive functional control is proposed for weakening the effect of the great inertial and long-time delay and enhancing control precision of main steam temperature. Simulation experiments with different loads shows that the proposed method is better than the traditional PID control and fixed model predictive functional control.
  Ma Wei-gang , Cao Yuan , Wei Wei , Lu Wei , Ma Jian-feng and Hei Xin-hong
  In view of utilizing Petri net to perform analysis of UML model, this paper proposes a transformation methodology from UML statechart to Petri net in terms of the semantics. Firstly, it gives the formal definition of the UML statechart, uses state sets, transition sets, event sets, guard sets, object sets and refinement functions of the state to describe the features of the UML statechart and designs transfer sets of state concurrency, transfer sets of collision and transfer priorities. Based on the strict formal semantics of the Petri net, the study studies the equivalency between them and proposes a transformation algorithm from UML statechart to Petri net which lays the foundation of automated transformation. Finally, in order to validate the proposed methodology, a novel decentralized railway interlocking system which ensures train safety in stations is modeled and analyzed.
  M.A. Wei-Gang , C.A.O. Yuan , Wei Wei , Lu Wei , M.A. Jian-Feng and H.E.I. Xin-Hong
  Health management has been a technology which is widely used in the area of aerospace and weaponry in recent years to monitor the state and repair the failure of a system or component parts. According to the problems of safety computer in CBTC, the study studies the health management technology of safety computer platform in depth such as state monitor and fault diagnosis, using the “soft” failures related to the hardware failures. First, this study introduces the concept of Health Management and expounds the model with Condition-Based Maintenance as the breakthrough point. 1207231545 (HMM) is introduced to the fault diagnosis of safety computer platform, because of the similarities between recognition algorithm and fault diagnosis and its successful application in the field of pattern recognition. Second, based on demand analysis of safety computer in CBTC, simulation safety computer platform of 2-out-of-2 redundant structure is designed using the common computers. The implementation of health management based on Hidden Markov Model can well solve Condition-Based Maintenance problem of safety computer platform. It has certain reference value to health management study of other safety system.
 
 
 
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