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2007 Vol. 33, No. 01

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Influence on flow around mid-part of slender at high AOA by sweep wing
Li Guohui, Deng Xueying
2007, 33(01): 1-4.
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Abstract:
The flow around a slender was fixed in this way which a tiny pert urbation was located on the nose of the slender. The influence on flow str u cture and aerodynamic of a slender by sweep wing at high angle of attack was studied. The experimental results indicate that at angle of attack 30°,the fl ow...
Process mechanism of synthetic jet and its effect on the mixing in coaxial jets
Liu Yanming, Wu Naiming, Dong Jinzhong, Zhou Sheng
2007, 33(01): 5-9.
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Abstract:
Two-dimensional unsteady numerical simulation was carried out to inve s tigate the flowfields surrouding a synthetic jet actuator and its effect on the mixing in coaxial jets. The synthetic jet flowfield and the coaxial jets flowfie ld were investigated. The results show synthetic jet comprises a se...
Rotor dynamic analysis based on solid element
Chen Meng, Hong Jie, Zhu Bin, Liu Shuguo
2007, 33(01): 10-13.
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In modern times, dynamical interaction of different structures should be taken into account in aero-engine vibration analysis, as a reason, the engine should be modeled by solid elements. To take the gyroscopic effect into account in the analysis of complex rotor dynamics characteristic, based on th...
Aerodynamic optimization method of transonic fan rotor based on BVF
Wu Hong, Li Qiushi, Guo Ming, Zhou Sheng
2007, 33(01): 14-17.
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The aerodynamic optimization of a transonic fan rotor was implemented by controlling the BVF(boundary vorticity flux) distribution on rotor blade. A novel objective function of torque associated with BVF was used to optimize the blade configuration. The physical sources of separated flow could be pr...
Simulation of hypervelocity impact to honeycomb sandwich
Xu Xiaogang, Huang Hai, Jia Guanghui
2007, 33(01): 18-21.
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Honeycomb sandwich is a special configuration which often used in spac ecraft . The method of smoothing particle hydrodynamics (SPH) in the hypervelocity impa ct simulation to the honeycomb presents two questions: it is problematic to mode l the honeycomb, the distance between the neighboring partic...
Numerical simulation analysis of leakage flow in compressor cascade with splitter
Li Haipeng, Liu Huoxing
2007, 33(01): 22-26.
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Abstract:
3D numerical simulation with S-A turbulence model was applied to the low subsonic leakage flow analysis of traditional compressor cascade and splitter compressor cascade with clearance. The result shows: short splitter has weak influence on the suction pressure distribution, leakage flux and the pos...
Base operational unit corrective maintenance process modeling and simulation
Guo Linhan, Kang Rui
2007, 33(01): 27-31.
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To analyze base operational unit(BOU) corrective maintenance stratagem and accurately calculate fault recovery time, BOU corrective maintenance proces s simulation models among depots was set up, the models in dep ot was also set up according to system engineering modeling ideology, BO U corrective ...
Impact of IGV/rotor interaction on rotor flow field in an axial compressor
Gong Zhiqiang, Lu Yajun, Li Zhiping, Li Maoyi
2007, 33(01): 32-37.
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The IGV/rotor interaction phenomenon in turbomachinery has been resear ch focuses for years, but until now such researches have been restricted to qual itative description of flow phenomenon without theory instructions. So this very important unsteady phenomenon can not be included in turbomachinery...
Dynamic characteristics of high temperature superconductor bulk magnetic suspension system
Wen Zheng, Liu Yu, Yang Wenjiang, Qiu Ming
2007, 33(01): 38-41.
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Abstract:
The magnetic levitation technology was regarded as a preferable alternative for the next generation of launcher system owing to its cost-effectivenes s and perfect performance. A research plan was performed in our lab by constructing a scale-model suspension system with high temperature superconduct...
Numerical simulation of secondary gas injecting for thrust-vector-control
Wu Xiong, Zhang Weihua, Wang Zhongwei
2007, 33(01): 42-45.
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Abstract:
The complex inner flow-field of secondary gas injection for solid rock et motor were numerically investigated using three-dimensional average Favre N -S equations and the k-ε turbulent models. Three-order spatial scheme an d implicit point Jacobi algorithm were used to solve these equations. The bas...
Aircraft landing gear system dynamic modeling and simulation
Li Bo, Jiao Zongxia
2007, 33(01): 46-49.
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Abstract:
Aircraft interacts with the ground through landing gear system, wh ile taxiing down the runway. Owing to the changed forces and moments acted on th e aircraft, the landing gear shocks, and consequently results in the shift of th e aircraft Euler angle. In order to study the aircraft taxiing characte...
Geometry nonlinear analysis of composite thin walled beams
Shi Qinghua, Xiang Jinwu
2007, 33(01): 50-54.
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A new geometry nonlinear finite element model for composite thin walle d beams has been developed based on the complex deformation characteristic of th e composite thin walled beams. Supposed the strain quadratic varies along the th in-walled, introducing the complex cross-section of beam was simula...
Study on H.323-based distributed gatekeepers
Shen Wei, Ding Rong, Zhang Hui
2007, 33(01): 55-58.
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The scalability of H.323-based video conferencing system is closely re lated to the architecture of gatekeeper (GK). A distributed H .323 gatekeeper architecture based on multiple zones was proposed, providing the solution for the deployment of multimedia video conferencing system on the large scale...
New extended workflow net for formalizing workflow patterns
Zhang Liang, Jin Maozhong, Yao Shuzhen
2007, 33(01): 59-62.
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To satisfy the enterprise process modeling requirements in the ability of powerf ul expression and analysis, a new extended workflow net(EWF_net) was proposed fo r formalizing workflow patterns. EWF_net extended workflow net(WF_net) by adding some mechanisms, and improved the power of describing dyn...
New solution for IPSEC passing through NAT
Peng Jinbing, Long Xiang, Gao Xiaopeng, Chen Xianqin
2007, 33(01): 63-66.
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Abstract:
The application range of IP security protocol (IPSEC) is badly restric ted due to the incompatibility of IPSEC and network address translator (NAT). Th e rule that must to be followed by the solutions for IPSEC passing through NAT i s that IPSEC pass through NAT without any changes to the routers an...
Fault diagnosis based on wavelet package and Elman neural network for a hydraulic pump
Liu Hongmei, Wang Shaoping, Ouyang Pingchao
2007, 33(01): 67-71.
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Abstract:
Considering the low signal-to-noise, faint failure characteristics of hydraulic pump, and slow convergence speed and the instability of BP network , a new fault diagnosis method based on the wavelet package analysis and Elman n eural network is presented. The wavelet package analysis is adopted to e...
Imaging algorithm for high-resolution space-borne spotlight SAR data based on two dimension deramp processing
Wang Pengbo, Zhou Yinqing, Chen Jie, Li Chunsheng
2007, 33(01): 72-75.
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Abstract:
Reduced the data rate is one of the difficulties in high-resolution space-born e spotlight synthetic aperture radar (SAR). Based on two-step focusing algorith m and chirp scaling(CS) algorithm, two dimension deramp chirp scaling(TDDCS) alg orithm for processing high-resolution space-borne spotlight ...
Space-time interference suppression technology of satellite navigation receiver
Zhang Lin, Chu Haibin, Zhang Naitong
2007, 33(01): 76-80.
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Abstract:
If several interferences (including broadband and narrowband) appear o r satellite signal and interference have similar direction of arrival, the locat ion precision decreases below the normal level required in satellite navigation receiver. Therefor a constrained space-time adaptive processing(STAP...
Coordinated target assignment in multi-UAV based on satisficing decision theory
Liao Mo, Chen Zongji
2007, 33(01): 81-85.
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Abstract:
A key problem addressed in study of uninhabited aerial vehicle (UA V) is to coordinated assign targets in multi-UAVs. The mathematic model for mul t i-UAV cooperative target assignment problem was built, when assigning targets i n multi-UAVs, the model considered about effect of the battle field sit...
Application of fuzzy sliding mode iterative learning control algorithm in hydraulic servo system
Wang Yan, Fu Yongling
2007, 33(01): 86-89.
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Abstract:
The common P(proportion) type or PD(proportion and differential) type ILC(iterative learning control) is difficult to apply in a hydraulic servo syste m because of its low convergence rate. To improve the convergence rate, a new IL C based on a sliding mode fuzzy control is presented which combines ...
Three-phase aeronautical active power filter based on space vector and one-cycle control
Wang Yong, Shen Songhua
2007, 33(01): 90-93.
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Abstract:
A new control method for the three-phase aeronautical active power filter was proposed. According to the ideal of space vector, the t hree-phase voltage was divided to six regions, where the model of one - cycle control was established. The proposed controller need only one integrato r with reset, t...
Decouple analysis and simulation of displacement control for cable-driven manipulator
Chen Weihai, Wang Huihua, Yu Shouqian, Lei Yinzhao
2007, 33(01): 94-99.
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Abstract:
To improve the load capacity of the manipulator, based on the geometry analysis and screw theory, the configuration design, c able-driven manner, and kinematics control for a cable-driven humanoid-arm ma nipulator were analysed. Firstly, aiming at the choice of cables-driven manner s, a cable-driven...
Comparative analysis on kinetics with redundant driving of Cartesian serial-parallel manipulator
Luo Jianguo, Lu Zhen
2007, 33(01): 100-104.
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Redundant driving structure designed based on a new type of universal Cartesian serial-parallel manipulator, kinetics equations and Euler equations constructed, complete analysis of each jointed points of the moving platform carried out, inverse kinetics solution can be obtained with the given param...
Optimal motion planning of a three-link planar under-actuated manipulator system
Liu Shengping, Lu Zhen, Wu Licheng
2007, 33(01): 105-109.
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An optimal motion planning scheme for a three-link planar under-actuated manipulator moving between two stationary states was considered. The manipulator has two prismatic joints that are actuated, while the third joint of the manipulator is a revolute passive joint which has neither an actuator nor...
Bearing capacity and ductility of reinforced concrete columns with Z-shaped cross-section
Jiao Junting, Diao Bo, Ye Yinghua, Li Shuchun
2007, 33(01): 110-114.
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Against there is no design specification for reinforced concrete (RC) columns with Z-shaped cross-section in the technical regulation of structure w it h special shaped columns, the bearing capacity and ductility of RC Z-shaped cro s s-section were computed by utilizing the nonlinear analysis of RC ...
Uncertainty modeling in multidisciplinary design optimization
Han Minghong, Deng Jiati
2007, 33(01): 115-118.
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Uncertainty is pervasive throughout the design process of complex engineering system. The sources of uncertainty in multidisciplinary design optimization(MDO) were summarized and classified into three categories: requirement error, input data error and model error. A mathematical model was built up ...
Analysis of the properties for epoxy curing agents with reactivity and toughening
Yang Yang, Chen Gong
2007, 33(01): 119-122.
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A type of novel epoxy curing agent, Bis(2-hydroxy-3-amidoethylaminemethyl-5 -nonylphenyl) methane(BA) was synthesized from dimer which was obtained from n onylphenyl and formaldehyde. The structure of this curing agent was attributed b y IR and 1HNMR. The reactivity of the curing agent was investiga...
Product rapid design based on integrated knowledge model
Zhao Hui, Xi Ping
2007, 33(01): 123-126.
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The approach to improve the existing CAD(Computer-aided design) system s′ capacity in design knowledge reuse was discussed. The scheme and implementat i on approach of representing hierarchical knowledge and constructing integrated k nowledge model were proposed. Design knowledge was divided into th...

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