Guo S.-S.,Liaoshen Industries Group Co. |
Yang R.-J.,China Academy of Engineering Physics |
Wang L.-M.,Nanjing University of Science and Technology
Dandao Xuebao/Journal of Ballistics | Year: 2013
In order to obtain the optimal glide project trajectory, the extend-range trajectory optimal model was established based on the partile trajectory model of guided projectile, the flight state constraint conditions and the objective function of maximum range. Accurate optimal trajectory can't be obtained by traditional uniform parameterization method. Aiming at this problem, the control horizon was divided into several time stages of varying lengths and the length of each time period was defined as optimization parameters. The glide project trajectory was optimized by time-scaling non-uniform parametric method combined with sequadratic programming. The simulation results show that, compared with traditional methods, the project trajectory designed by this approach has a farther range, a higher terminal speed and more advantages of ballistic performance.
Wang Y.,Shenyang University of Technology |
Wang Y.,Inner Mongolia University for Nationalities |
Liang L.,Liaoshen Industries Group Co. |
Yu B.,Shenyang University of Technology |
And 2 more authors.
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2013
An experimental equipment with inclined plate cooling and shearing has been developed to prepare semi-solid ZL104 alloy slurry. The effects of inclined plate angle on microstructure refinement and spheroidization in semi-solid ZL104 alloy were investigated. The results show that the inclined plate angle has remarkable effect on physical metallurgy and shear action of ZL104 alloy. Fine spherical grain in the semi-solid ZL104 alloy slurry can be obtained in range of 30°~45°, and the major grain equivalent diameters are less than 43 μm and more than 40% of the grain shape factor is in 0.75 above at 45°, exhibiting better grain fine degree and roundness.
An X.,Shenyang Ligong University |
Li L.,Shenyang Ligong University |
Liu X.,Liaoshen Industries Group Co.
Jixie Qiangdu/Journal of Mechanical Strength | Year: 2013
The threaded connection of a special container is the part which has the biggest possibility to damage. Its strength is the key to ensure the safety of work. It can be done based on Saint-Venant principle to build axisymmetric finite element model and the three-dimension sub-models of both the equidistant straight threads and the spiral one with a thread angle. The effects of the material nonlinearity and the contact nonlinearity on the container should be taken into account. And the cutting boundary displacement of the overall model which is axial symmetry is used as the boundary displacement of the three-dimension sub-models. The comparative analyses of the results of their calculating stress distribution should be made in detail.
Wang M.,Shenyang Ligong University |
Liu Q.,Shenyang Ligong University |
Sun Y.-J.,Liaoshen Industries Group Co. |
Che Y.-S.,Shenyang Ligong University |
Jiang C.-Z.,Shenyang Ligong University
Wuji Cailiao Xuebao/Journal of Inorganic Materials | Year: 2013
Eu3+-doped BiVO4 photocatalyst was synthesized by complexing Sol-Gel method using citric acid as chelate, and characterized with X-ray photoelectron spectroscope(XPS), X-ray diffraction(XRD), scanning electron microscope(SEM), specific surface area (BET) and UV-Vis diffuse reflectance spectroscope(DRS). The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange (MO) solution under visible light. It revealed that pure BiVO4 and all the Eu3+ doped samples were monoclinic phase and no peaks of any other phases or impurities were detected. It was also found that doping Eu3+ increased the amount of V4 and oxygen vacancies. In addition, the light absorption edges of Eu3+ doped BiVO4 had extended a red shift compared with that of pure BiVO4. However, Eu3+ doping had little influence on morphology and specific surface area. The appropriate amount of Eu3+ doping could signifcantly increase the photocatalytic activity and the highest photocatalytic degradation rate was about 95% when the Eu3+ doping amount was 0.2%, which was more 62% than that of pure BiVO4 under 50 min visible light irridation.
Luo X.-C.,Nanjing University of Science and Technology |
Yao W.-J.,Nanjing University of Science and Technology |
Xu W.-K.,Liaoshen Industries Group Co. |
Zhuo C.-F.,Nanjing University of Science and Technology |
And 2 more authors.
Hanneng Cailiao/Chinese Journal of Energetic Materials | Year: 2015
In order to research the effect of combustion rate of the propellant on the operation process and the firing range of base bleed projectile, the flight ballistic of base bleed projectile was solved by using the computational aerodynamics coupled with particle trajectory. The changes of operation parameter, operation status, flow filed of base bleed projectile with time in the drag reduction stage were studied. The effect of combustion rate of propellant on the operation process and firing range of base bleed projectile were analyzed in detail. The simulation results are in good agreement with the target range test results of the standard base bleed projectile, indicating that the calculation model established is correct and reasonable. When the combustion rate adjustment coefficient changes from 0.8 to 1.2, the combustion time decreases from 36.4 s to 18.4 s, firing range decreases from 38.12 km to 36.21 km and the extended-range rate decreases from 33.32% to 26.64%. With the increasing of time, the base bleed parameters of the base bleed projectile with different combustion rate increase first and then decrease during the drag reduction period. The bleed mass flow rate of base bleed projectile with high combustion rate is larger than that of the base bleed projectile with low combustion rate, but there is no obvious increase of reduction drag effect. © 2015, Institute of Chemical Materials, China Academy of Engineering Physics. All right reserved.