Abstract-Hydroelectricity as a renewable energy to respond the increasing population and environment crisis is widely used in the world. With the Hydro Turbines/Generators (HTG) being more and more complicated, the maintenance play a more and more important role in the production management in the hydro power plant. Many researches had concentrated on the predictive maintenance for the HTG in recent years. From the perspective of data-driven, this paper reviews and summarizes the key techniques regarding data acquisition, data processing, data analysis and data mining for the predictive maintenance of HTG. Especially, it place emphasis on the data-driven models for the diagnostics and prognostics. Finally, the paper concludes the current practices and presents a future research work.
Security of Wireless Local Area Network (WLAN) is a research hotspot at all times. Although many researches concerning security standards, principles and algorithms have been published, the implementation solution is seldom focused on. This paper studies the architecture of WLAN security authentication based on WLAN Authentication and Privacy Infrastructure (WAPI) and presents a software solution to the authentication server. The P-V operations primitive is applied to construct an optimized multithread scheduling model to authentication services. The certificate authentication algorithm is designed based on OpenSSL encryption algorithms library. A prototype is presented to confirm the feasibility and effectiveness of the solution.
To deal with the low efficiency and difficulty in production management and quality control of aero-engine assembly process, this paper proposed an Assembly Manufacturing Execution System (AMES) to reduce the assembly faults and improve the efficiency of management. According to ISA95 standard, it adopted activity models for assembly manufacturing and quality management to describe the functions of AMES. On the basis of activity model, it established the architecture of AMES aiming at the characteristics of engine assembly field. The core data structure and operation flow of AMES was realized by object models of assembly production and quality management. A case of AMES was developed and applied to the assembly workshop of aero-engine. The results show the AMES improves the efficiency of assembly operation and management.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.