Liu W.-H.,Beihang University |
Dong Y.,Shenyang Aircraft Industries Group Co. |
Liu J.-H.,Beihang University |
Wu H.,Beihang University |
Yu M.,Beihang University
Beijing Keji Daxue Xuebao/Journal of University of Science and Technology Beijing | Year: 2012
The electrochemical corrosion behavior of 20#carbon steel in NACE solutions containing different mass concentrations of H2S (0, 95.61, 103.22, and 224.16 mg·L-1 ) at different temperatures (25, 35, and 45°C) was investigated by potentiodynamic polarization tests, electrochemical impedance spectroscopy (EIS), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The formation mechanism of corrosion products was also discussed. It is found that the corrosion rate of the carbon steel increases significantly with the addition of a small amount of H2S in the NACE solution by promoting both the anodic iron dissolution and the cathodic hydrogen evolution. The corrosion current density of the carbon steel enhances with the increment of H2S concen-tration. As the temperature of the electrolyte solution increasing, the corrosion rate also increases. The outer loose corrosion products are mainly iron carbonate; but corrosion products formed on the steel surface are mainly composed of iron sulfides.
Xie D.Y.,Shenyang Aircraft Industries Group Co. |
Wu X.J.,Northeastern University China |
Lu F.Q.,Northeastern University China |
Huang M.,Northeastern University China
Advanced Materials Research | Year: 2014
The method of HFMFs (Hypertrapezoidal Fuzzy Membership Functions) is a new mechanism for designing multidimensional fuzzy sets. HFMFs models the correlation that exists between the variables of the state space. Therefore, it is able to describe the problems of fuzzy situation more exactly. As we known, it needs a great many information to evaluate the risk level for VE using fuzzy synthetic evaluation method. However, there are lots of difficulties to get the needed information for VE. Accordingly, the HFMFs method is introduced to estimate the risk level of VE. Considering not only the relations between different fuzzy sets but also the method of HFMFs is able to describe the problems of fuzzy situation more exactly with less information. Consequently, the HFMFs method is more suitable to the virtual enterprise with little historical experiences than the fuzzy synthetic evaluation method. Simulation has shown that this method is a simple and effective risk evaluation method for VE. © (2014) Trans Tech Publications, Switzerland.
Huang M.,Northeastern University China |
Bo G.-H.,Northeastern University China |
Xie D.-Y.,Shenyang Aircraft Industries Group Co.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2013
Based on the background of fourth-party logistics, a two-phase algorithm was proposed for solving the fourth-party logistics routing problem with time windows. A simple graph was generated from a multigraph in the distribution network using harmony search mechanism, and then the top K shortest paths in the simple graph were obtained using deletion algorithm. The proposed algorithm can ensure all the solutions to be feasible paths and the information of solution to be reserved. Because no ineffective paths were needed to be repaired, a lot of computational time can be saved. Three cases of different sizes were solved by the proposed algorithm, and the results were compared with the harmony search and the enumeration algorithms, which shows that the proposed algorithm outperforms the other two ones.
Du J.-Q.,PLA Air Force Aviation University |
He Y.-T.,PLA Air Force Aviation University |
Yu Z.-M.,CAS Shenyang Institute of Metal Research |
Yu H.-T.,Shenyang Aircraft Industries Group Co.
Corrosion and Protection | Year: 2010
Ni-Fe alloy coatings with different Fe contents were fabricated by electroplating on LY12CZ aluminum alloy substrates. Potentiodynamic polarization curves in 3. 5% NaCl solution were tested to investigate the corrosion resistance of the coatings. The results showed that the Ni-Fe coating with 7. 3% Fe had better corrosion resistance than Ni coating. With the increase of Fe content, the grain size enlarged, porosity rised, and corrosion resistance declined.
Mao D.H.,PLA Air Force Aviation University |
Fang Y.W.,PLA Air Force Aviation University |
Zang X.,Shenyang Aircraft Industries Group Co. |
Diao X.H.,PLA Air Force Aviation University
Engineering Review | Year: 2015
In allusion to the particularity of Multi-Fighter Cooperative Detection, this paper analyzes the influence of different formation modes of the aircraft.. The framework of basic formation modes is established, moreover, the solutions of these models are also introduced. There is some disadvantage of gridding-method on real-time performance. A transformed chameleon method is used to divide up the big formation and cluster it into the basic ones. The rules-less formations' detect an overlay area and divided into basic ones, can be figured out on the ground of dividing results. In this way, we can reduce the fighter formations to calculate the overlay capacity fleetly. The simulation results indicate that the method meet the real-time needs with error permissibility. © 2015, University of Rijeka. All rights reserved.