The 718th Research Institute of China Shipbuilding Industry Corporation

Handan, China

The 718th Research Institute of China Shipbuilding Industry Corporation

Handan, China
SEARCH FILTERS
Time filter
Source Type

Guo J.,Tianjin University | Guo J.,The 718th Research Institute of China Shipbuilding Industry Corporation | Liu T.,Tianjin University | Chi W.,The 718th Research Institute of China Shipbuilding Industry Corporation | And 2 more authors.
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2011

The paper analyzes the damages of shock and vibration to precise mobile vehicle-mounted optical systems during transportation process and working condition, points out that structural deformation and vibration are the main factors influencing optical system stability and vehicle installation implementation, and notes that it is the key technique to achieve the optical system stability by improving the overall vehicle stiffness, stability and vibration isolation performance of the mobile vehicle-mounted optical platform. The structure and composition of the vehicle-mounted optical platform as well as high stiffness and double-layer isolation design solutions are discussed. The modal analysis of the designed double-layer optical platform isolation system is carried out with ANSYS finite element method. Force modal testing is also conducted on this optical platform isolation system for verification. The results show that the double-layer vehicle-mounted vibration isolation system for optical platform has good structure stability; it has good attenuation effect on strong vibration caused by gas drainage. The experiment results and the simulation model have good consistency.


Liu S.,The 718th Research Institute of China Shipbuilding Industry Corporation | Liu Q.,The 718th Research Institute of China Shipbuilding Industry Corporation | Chen L.,The 718th Research Institute of China Shipbuilding Industry Corporation | Li J.,The 718th Research Institute of China Shipbuilding Industry Corporation | And 2 more authors.
Zhongguo Jiguang/Chinese Journal of Lasers | Year: 2010

In order to minimize optical distortion of beam introduced by gas jet stream and improve optical transmission quality, a project of utilizing N2/He mixture as working gas is proposed based on matching index-of-refraction and equalizing pressure. The method for determining gas mixture composition is also discussed. Experiments are carried on N2 and N2/He mixture respectively, and the laser beam wavefront aberration peak-to-valley(PV) value is measured from the data collected by Hartmann sensor. The results show that the wavefront distortion PV value of aerodynamic window(ADW) is 0.18 μm approximately in case of N2; while that is 0.13 μm in case of N2/He mixture. The optical quality of the ADW can be improved by using N2/He mixture as working gas instead of N2.


Zhou J.,The 718th Research Institute of China Shipbuilding Industry Corporation | Yin Y.,The 718th Research Institute of China Shipbuilding Industry Corporation | Zheng H.,The 718th Research Institute of China Shipbuilding Industry Corporation | Xu Y.,The 718th Research Institute of China Shipbuilding Industry Corporation | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2012

Conversion of CO 2 to CO by H 2 has been recognized as one of the important processes for CO 2 utilization, but it is difficult to obtain high CO yield by catalytic method. We discussed the role of plasma activation in the direct gas phase reduction of CO 2 to CO. The plasma was obtained by dielectric barrier discharge to the mixture of H 2 and CO 2 at room temperature and atmospheric pressure. Moreover, we investigated the effects of main parameters on CO 2 conversion, CO selectivity and energy efficiency of CO 2 conversion, such as discharge power, the structure of plasma reactors, the ratio of H 2 to CO 2 as well as space between electrodes. It is observed that, at room temperature and atmospheric pressure, H 2 and CO 2 can be directly converted into CO only by plasma activation. The proper adjustment of above parameters can increase CO 2 conversion. When the CO 2 flow rate of the feed gas, the ratio of H 2 to CO 2, the discharge power, and the discharge frequency are fixed at 120 mL/min, 80 W and 10 kHz, respectively, the CO 2 conversion efficiency and CO selectivity are 88.2% and 100%, respectively.


Guo J.,Tianjin University | Guo J.,The 718th Research Institute of China Shipbuilding Industry Corporation | Liu T.,Tianjin University | Wang Z.,The 718th Research Institute of China Shipbuilding Industry Corporation | Zhou X.,The 718th Research Institute of China Shipbuilding Industry Corporation
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2011

In order to meet the requirement of high-energy laser output from a vacuum resonator to atmosphere and reduce the effect of windows thermal deformation on laser beam performance, the paper introduces a technical solution which can reduce laser irradiation on solid window. In the solution, solid window is driven by high torque hollow DC motor and rotates uniformly. The isolation between vacuum resonator and environmental atmosphere is fulfilled by high-precision dynamic seals. And thus the irradiation on window is more uniform, i.e. the window temperature and stress gradient are decreased greatly, the laser beam quality is improved, and cracks in window can be avoided in long-time running. The results show that the solution is of several advantages, such as small volume, light weight, compact configuration, easy to use and maintain. It can improve laser beam quality efficiently and make long-time running of high-energy laser possible.


Huang X.,The 718th Research Institute of China Shipbuilding Industry Corporation | Yu K.,The 718th Research Institute of China Shipbuilding Industry Corporation | Zhu C.,The 718th Research Institute of China Shipbuilding Industry Corporation | Li H.,The 718th Research Institute of China Shipbuilding Industry Corporation
Huaxue Fanying Gongcheng Yu Gongyi/Chemical Reaction Engineering and Technology | Year: 2011

The Pd/γ-Al 2O 3 catalysts were prepared by plasma method, and characterized by means of X-ray diffraction(XRD) and transmission electron microscope(TEM). The activity of he Pd/γ-Al 2O 3 for CO catalytic oxidation were investigated. The results showed that Pd 2+ was changed to Pd during the process of the catalysts treated by plasma, the particles of Pd were smaller. The CO conversion catalysts prepared by plasma method reached 92% under the conditions of temperature 60°C and high velocity of 15000 h" 1, which was higher than conventional he Pd/γ-Al 2O 3-C catalysts by 25%.


Zhou J.-C.,The 718th Research Institute of China Shipbuilding Industry Corporation | Yin Y.-H.,The 718th Research Institute of China Shipbuilding Industry Corporation | Zheng H.-Y.,The 718th Research Institute of China Shipbuilding Industry Corporation | Zhou X.,The 718th Research Institute of China Shipbuilding Industry Corporation | And 4 more authors.
Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities | Year: 2011

A non-thermal atmospheric pressure plasma by dielectric barrier discharge was used to study the direct oxidation of methane to hydrogen peroxide. The effects of the structure of plasma reactors, as well as the ratio of CH4 to O2, were investigated. It is observed that at room temperature and atmospheric pressure, methane and oxygen can be directly converted into hydrogen peroxide with high yield. When a double dielectric barrier discharge(DDBD) plasma reactor is fed with a CH4/O2 mixture containing 50%(volume fraction) at a total flow rate of 50 mL/min (CH4+O2), it generates H2O2 with 29.2% yield and the H2O2 formation efficiency is estimated to be 221.6 g/m3(CH4/O2). The high H2O2 yield obtained by CH4/O2 plasma method may be attributed to the nonequilibrium property of non-thermal plasma that the electron energy inside the conductive filament corresponds to a few electron volt, while the gas temperature stays close the temperature of the background gas. As a result, the energetic electrons in the plasma region collide with molecules and atoms of the CH4/O2 mixture and generate excited species, atoms, as well as other molecular fragments that initiate the ensuing chemical reactions and produce H2O2, while the thermal decomposition of H2O2 is neglectable because of low gas temperature.


Niu Z.,The 718th Research Institute of China Shipbuilding Industry Corporation | Guo J.,The 718th Research Institute of China Shipbuilding Industry Corporation | Ren X.,The 718th Research Institute of China Shipbuilding Industry Corporation | Wang Z.,The 718th Research Institute of China Shipbuilding Industry Corporation
Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams | Year: 2011

The resonator's cross section of high power chemical laser is commonly rectangle with large aspect ratio. Fast Fourier transform(FFT) method and thin gain sheet approximate calculation are used in simulating the optical resonators. Simulations give near field normalized intensity distribution, near field relative phase distribution and far field normalized intensity distribution. The output beam quality influenced by heterogeneous gain was analyzed. The numerical results also illustrated that the normalized central intensity of far field spot will turn dark along with the increasing of geometrical magnification. The method and results provide a theoretical basis for improving the beam quality.

Loading The 718th Research Institute of China Shipbuilding Industry Corporation collaborators
Loading The 718th Research Institute of China Shipbuilding Industry Corporation collaborators