China State Shipbuilding Corporation System Engineering Research Institute

Beijing, China

China State Shipbuilding Corporation System Engineering Research Institute

Beijing, China
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Chen P.,Chinese Academy of Sciences | Chen P.,University of Chinese Academy of Sciences | Chen P.,China State Shipbuilding Corporation System Engineering Research Institute | Xiong W.,Chinese Academy of Sciences
Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | Year: 2017

Aimed at the problems in Rician fading channel, i.e. general Non-Data-Aided signal-to-noise ratio(SNR) estimation algorithms were very complex and usually suitable for a certain modulation pattern. This paper proposed an SNR estimation algorithm. On the basis of establishing equivalent system model, the relationship expression of SNR, expectation and variance of received signals were deduced. Under the conditions of the Rician fading channel, the deduced expression had no analytic solutions, thus using the polynomial fitting method to obtain approximate solutions of SNR during a certain range. Simulations and comparison experiments show that, the algorithm does not need any training sequence and is universal for both lower and higher order modulations. If the channel Rician factor K=10 dB and the SNR is between 5 and 25 dB, the normalization bias is lower than 0.2, the computational complexity is comparable with M2M4 algorithm, thus satisfying requirements of general engineering application. © 2017, Editorial Department of Journal of Southeast University. All right reserved.


Dai Y.-J.,China State Shipbuilding Corporation System Engineering Research Institute | Liu F.-S.,Beijing Institute of Technology | He X.,Beijing Institute of Technology | Liu F.-S.,NRC Institute for Chemical Process and Environmental Technology
Neiranji Xuebao/Transactions of CSICE (Chinese Society for Internal Combustion Engines) | Year: 2015

Stable laminar diffusion flames of different gasoline-diesel blends, namely G0, G20, G50, G80 and G100, were formed using a novel pre-vaporized liquid fuel burner system to investigate the soot formation characteristics in these flames. A two-dimensional line-of-sight attenuation technique was employed to acquire the twodimensional transmissivity images followed by an effective tomographic inversion algorithm for soot volume fraction distributions. Soot particles were also sampled using a rapid insertion probe for transmission electron microscope(TEM)image analysis to get soot morphology and primary particle size information. Test results show that, with the increase of gasoline to diesel, soot concentrations decrease to different levels at different heights, showing the stronger soot generation propensity of diesel. Soot particle sizes also decrease when more gasoline is added to diesel but primary soot particle diameters remain in the range from 14 nm, to 39, nm. ©, 2015, Chinese Society for Internal Combustion Engines. All right reserved.


Luo Y.,China State Shipbuilding Corporation System Engineering Research Institute | Zhang J.,China State Shipbuilding Corporation System Engineering Research Institute | Qin Y.,China State Shipbuilding Corporation System Engineering Research Institute | Han S.,Beijing Jiaotong University | Wang Y.,China State Shipbuilding Corporation System Engineering Research Institute
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2015

The flight director and guarantee process as a kind of typical complex process, the modeling problem has become the current hot and difficult problem in the research field of the complex processes. An integrated modeling method of flight director and guarantee process was proposed combined with the typical process equipment air command and support building requirements. The following several aspects were mainly elaborated: The meta model of flight director process, service operation sequence modeling, machine process choreography. A prototype simulation and evaluation system was developed, and the rationality of the proposed method was analyzed combined with the application example. ©, 2015, Chinese Association for System Simulation. All right reserved.

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