Air Force Engineering Design and Research Institute

Beijing, China

Air Force Engineering Design and Research Institute

Beijing, China

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Hu Z.,PLA Air Force Aviation University | Xu J.,PLA Air Force Aviation University | Xu J.,Northwest University, China | Peng G.,Air Force Engineering Design and Research Institute | Cao S.,Academy of Equipment Command and Technology
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2010

The infection of volume fractions and the strain rate to energy-absorption capacity were analyzed by specific energy absorption (SEA) index. The relation between the energy-absorption capacity and the failure forms were discussed. The results show that the high-strain-rate energy-absorption capacity of the EPSC materials exhibits a strong strain rate. The energy-absorption capacity of the EPSC increased first and then decreased with increasing the volume fraction of the EPS. The EPSC has the best energy-absorption capacity at the EPS fraction of 20%-30%.


Hu Z.-B.,PLA Air Force Aviation University | Xu J.-Y.,PLA Air Force Aviation University | Xu J.-Y.,Northwestern Polytechnical University | Cao S.,Academy of Equipment Command and Technology | Peng G.-F.,Air Force Engineering Design and Research Institute
Binggong Xuebao/Acta Armamentarii | Year: 2011

The dynamic mechanical properties of Styropor concrete (EPSC) added with various volume fractions of EPS at different strain rates were researched by using a 100-mm-diameter split Hopkinson pressure bar (SHPB) apparatus. The effect of EPS volume fraction and strain rate on its compressive strength and deformation were investigated. The experimental results show that the EPSC materials exhibits a strong strain rate dependency. With the increase in volume fraction of EPS, the impact compressive strength of EPSC is declined, and the toughness of EPSC is reinforced.


Zhu Z.,Wuhan University | Wu Y.,63869 Troops | Yang Y.,Air Force Engineering Design and Research Institute
Wuhan Daxue Xuebao (Xinxi Kexue Ban)/Geomatics and Information Science of Wuhan University | Year: 2010

Firstly, the limitations and advantages of various existing time synchronization solutions of GPS/INS are investigated in this paper. From the angle of modularity, a flexible low-cost time synchronization solution using a DAQ card and Labview software of NI in the way of both hardware and software is proposed and implemented. The test shows that a synchronization accuracy of 5 ms was achieved when the test system was applied to synchronize a low-grade micro-electromechanical inertial measurement unit (IMU), which only has an RS-232 data output interface.


Han W.,Nanjing Southeast University | Liu S.,Nanjing Southeast University | Zhang D.,Nanjing Southeast University | Zhou H.,Air Force Engineering Design and Research Institute
Geotechnical Special Publication | Year: 2011

Cavity expansion theory is used extensively in geotechnical engineering. The analytical solution of cavity expansion theory is all based on the isotropic initial stress in soil layer; however, due to the change of sedimentary environment and consolidated environment, the initial stress in soil layer is anisotropy. In this paper, the coefficient of lateral pressure at rest (K 0) is used to describe the degree of the anisotropy of the initial stress, and the FLAC software is employed to build a numerical model to analysis of the characters of cylindrical cavity expansion with anisotropic initial stress. The results indicate that the cavity shape is approximately ellipsoidal and the major axis of the ellipse locates at the direction of the major principal initial stress. In addition, the plastic zone around cavity is closely related to the initial stress state, and the largest range of plastic zone locates at the direction of the major principal initial stress. The influence of the undrained shear strength on the pressure-controlled cavity expansion process is also analyzed. With the increasing of undrained shear strength of soil, the largest range of plastic zone would decreases, which could decrease the effect of anisotropic initial stress on cavity expansion process. © 2011 ASCE.


Yang Y.,Air Force Engineering Design and Research Institute | Xu W.,Air Force Engineering Design and Research Institute | Qian Q.,China Construction Industrial Equipment Installation Co.
Journal of Geomatics | Year: 2015

This paper analyzes the errors affecting precision positions, directional measurement, and precision level of installation during the construction of building specifically designed for some special devices. Appropriate technical strategies are proposed to realize the on-site processing of observational data by applying Leica GeoMoS to the automated data collection and using VBA in Excel. These strategies, which can guarantee the installation accuracy and improve the efficiency of installation, are successful examples and solutions to similar engineering issues in the future.


Cai L.,PLA Air Force Aviation University | Wu A.,PLA Air Force Aviation University | Li G.,PLA Air Force Aviation University | Li T.,Air force Engineering Design and Research Institute
Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics | Year: 2011

In order to make the future large transporter adapt to allowable load of present airport pavement's requirement, after a great lot of investigations on pavement structure's type, thickness, allowable load and maximal tire press accepted, advisory value of aircraft classification number (ACN) and tire press of future large aircraft was given. A 3-D finite element model which had nine slabs was established, the mechanical responses of cement concrete pavement was analyzed with advisory ACN and tire press under single wheel and main landing gear of IL-76, C-5. With the aim to reconstruct present airports as little as possible, the ACN between 16.1 and 24.2 and tire press under 0.80 MPa is reasonable for future large transporter. Allowable load of present airport pavement can ensure the future large transporter operate normally on 50 percent of present airports without reconstructing.


Fang Q.,PLA University of Science and Technology | Cheng G.,PLA University of Science and Technology | Cheng G.,Air Force Engineering Design and Research Institute | Chen L.,PLA University of Science and Technology
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2012

The purpose of this paper is to predict dynamic responses and failure modes of RC columns subjected to blast loads. In this paper, the three failure criteria corresponding to the typical flexure failure, diagonal shear failure and direct shear failure were firstly presented. And an effective approach to predict the dynamic responses and failure modes of blast-loaded RC columns was established, incorporating the explicit finite difference method proposed in the reference [1] with the failure criteria. The effects of the blast loading (peak pressure, duration and intensity distribution on RC columns), cross-sectional resistance (bending capacity and shear capacity), axial loads and length on the responses and failure modes of RC columns were analyzed and discussed. It is demonstrated that the blast-loaded RC columns may suffer from typical flexure failure, diagonal shear failure and direct shear failure, just like RC beams. However, the diagonal shear failure is the most frequently observed. The shorter the loading duration is, the higher the peak value becomes. The weaker sectional shear capacityis, the more vulnerable to diagonal shear failure and even direct shear failure RC columns is. And the greater axial force, the longer column length, the more vulnerable to bending failure RC columns was.


Fang Q.,PLA University of Science and Technology | Cheng G.,PLA University of Science and Technology | Cheng G.,Air Force Engineering Design and Research Institute | Chen L.,PLA University of Science and Technology
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2012

In order to establish an efficient approach to analyze the non-linear response and to predict failure modes of RC columns under blast loading, the cross-sectional resistance functions, including the relationships of cross-sectional moment versus curvature, average shear stress versus average shear strain and direct shear stress versus direct shear slip under monotonic loading were firstly established by the layer model, the MCFT model, and Krauthammer's model, respectively. New hysteretic models for the resistance functions under cyclic loading conditions were then proposed. The governing equations of blast-loaded RC columns, which were derived from the Timoshenko's beam theory, were discretized by the finite difference method. Finally, an explicit analytical approach for the prediction of the non-linear responses and failure modes of RC columns subjected to blast loading was proposed. The results reveal that the approach can predict the responses and failure modes of RC columns quantitatively, which is validated by the good agreement between the numerical results and the test data.


Mao J.,PLA University of Science and Technology | Li W.,PLA University of Science and Technology | Li Y.,PLA University of Science and Technology | Wang B.,PLA University of Science and Technology | And 5 more authors.
Applied Mechanics and Materials | Year: 2012

The heat transfer characteristics of heat storage unit are analyzed by many researchers from both theoretical and experimental in solidification heat release. Most theoretical models define the initial temperature of the phase change materials is equal to the phase transition temperature, in fact, thermal storage unit in the application, its initial temperature is not equal to the phase transition temperature. Many theoretical models have not considered the impact of latent heat of solidification. In this paper, homemade inorganic hydrated salt material is used as heat storage media, packaging with a cylindrical container. The phase change heat transfer process was analyzed both from theoretical and experimental. The effect of initial temperature and the latent heat of the heat transfer material were both considered. © (2012) Trans Tech Publications.


Liu B.-G.,Beijing Jiaotong University | Xu G.-C.,Air Force Engineering Design and Research Institute
Yantu Lixue/Rock and Soil Mechanics | Year: 2011

The layered interval excavation method for a large span and high sidewall underground cavern is described in detail. Through numerical simulation, its feasibility is proved. A large span and high sidewall cavern construction practice is as follows; detailed large cavern reserved rock clapboard, upper, middle and bottom chamber between rock clapboard parallel excavation, and finally clear the rock clapboard full of this new method of construction of the excavation process. Through numerical simulation, the largest deformation caused by excavation, distribution of plastic zone and tension of rock bolting of two excavation methods are compared. The results show that the new method of rock excavation damage to surrounding rock is small. Finally, the applicable conditions for this new method are pointed. This method has universal significance for similar conditions of underground large cavern construction.

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