Dalian, China
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Chen Z.-Y.,Unit 92124 | Zhou S.-H.,Wuhan Naval University of Engineering | Han X.-L.,Unit 92337
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2014

SLF communication is usually applied to long-distance communication with underwater objects because of its long range, stabilization and high penetration rate of seawater. Atmospheric noise is the major interference source, which is always a trouble of long-distance underwater communication. From statistics, atmospheric noise is composed of background noise obeying to Gaussian distribution and impulsive noise. Alpha stable distribution model was adopted according to set parameters to produce random atmosphere noises firstly, which would be added to modulated MSK signals of a random message produced by computer. At last, blind sources separation (BSS) was applied to separate the atmosphere noise and MSK signals before demodulation. Simulated results indicate that the BER becomes worse than that without atmospheric noise. But demodulation BER after BSS is as the same as that without atmospheric noise. The reliability of communication system has been improved. © right.

Yang N.,Wuhan Naval University of Engineering | Lu G.-B.,Wuhan Naval University of Engineering | Chen Pan,Unit 92337
Yuanzineng Kexue Jishu/Atomic Energy Science and Technology | Year: 2014

The multilevel flow model (MFM) and the signed directed graph (SDG) were combined to analyze the alarm signals of the secondary loop system for nuclear power plant. The MFM was used to delaminate and describe nuclear power plant, and the SDG was used to analyze the logicality of the facility sign in the MFM. Two kinds of faults in the secondary loop system in nuclear power plant were simulated and the alarm signals were analyzed. The simulation results show that the fault source can be identified exactly and the transmit route of the alarm signals can be described clearly, which is helpful for operators to judge.

Shang A.-L.,Wuhan Naval University of Engineering | Xia L.,Wuhan Naval University of Engineering | Dong J.-X.,Unit 92337
Dalian Haishi Daxue Xuebao/Journal of Dalian Maritime University | Year: 2013

The direct feedback linearization (DFL) technique together with the gain scheduling multi-objective control theory are further developed and applied to design nonlinear excitation compensators, which selectively eliminates system nonlinearities and deal with plant uncertainties and interconnections between generators. Digital simulations show that control scheme achieves unified transient stability in the presence of parametric uncertainties and significantly sudden changes in the network parameters.

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