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2008 Vol. 34, No. 01

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Method of image quality assessment based on human visual system and structural similarity
Yang Wei, Zhao Yan, Xu Dong
2008, 34(01): 1-4.
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Through analyzing the influence of certain digital image factors (brightness, texture details, dimentional position, etc.) on human visual characteristic, a mathematic model which combines human visual characteristic and structural similarity of images was built, a new image-quality assessment metho...
Wall model in LES based on coherent structures
Zhang Nan, Liu Kai, Lu Lipeng, Yuan Xiangjiang
2008, 34(01): 5-8.
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The evolvement of a group of coherent structures in a turbulent boundary layer was studied previously. An initial structure was formed by the resonant triad waves which developed periodically in the streamwise direction. The characteristics and evolvement processes of the coherent structures were ob...
Numerical simulation on opposing jet in hypersonic flow
Tian Ting, Yan Chao
2008, 34(01): 9-12.
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The detailed influences of the free mach number, jet mach number, attack angle on the drag coefficient reduction were studied by high precise simulation of N-S(Navier-Stockes) equations. The Numerical results show good agreement with the experiments. It is indicated that the opposing jet is effectiv...
Effects of truncation on thrust performance of aerospike nozzles
Wang Yibai, Qin Lizi, Liu Yu, Wang Changhui
2008, 34(01): 13-16.
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To discuss the performance effects of plug truncation ratios, cold-flow tests were performed for 80%, 40%, 30% and 20% truncated aerospike nozzles by employing cold air as propellant. The test system apparatus and thrust measurement were introduced. The experimental altitude characteristics curves o...
Climbing technique of cleaning robot for spherical surface
Wang Wei, Zhang Houxiang
2008, 34(01): 17-21.
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Based on analyzing the characteristic of cleaning robot, a kind of auto-climbing robot for spherical surface was described, which could scramble on the top of National Grand Theatre by itself. The motion function was described in detail. As an automatic cleaning machine, which can move in all direct...
Grinding burn mechanism of Titanium alloys with SG wheels
Zhang Hongxia, Chen Wuyi, Chen Zhitong
2008, 34(01): 22-26.
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Titanium alloys have been widely used in aerospace for their excellent heat-resistant, erosive-resistant and especially high strength-to-weight ratio. Grinding burn is apt to occur in the grinding process of titanium alloys. The grinding burn mechanism of titanium alloys was studied on the base of s...
Optimal research of distributed parallel genetic algorithm for reactive power optimization
Liu Keyan, Li Yunhua, Sheng Wanxing
2008, 34(01): 27-30.
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A distributed parallel genetic algorithm based on personal computer (PC) cluster was proposed to solve reactive power optimization, aiming at the disadvantage of traditional genetic algorithm, such as the bad searching quality and long computation time. It adopts the improved genetic simulated annea...
Aadptive control with feedback linearization of hysteresis nonlinear aeroelasticity
Li Daochun, Xiang Jinwu
2008, 34(01): 31-34.
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The question of active flutter control of prototypical aeroelastic wing section in subsonic uncompressible flow is investigated. The dynamic equations of a two-dimensional airfoil with control surface are described in state space. Then based on Lie derivative, the partial input/output feedback linea...
Real-time visual system of night-flying across the sea
Yang Xinying, Gong Guanghong, Wang Xingren
2008, 34(01): 35-38.
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The natural scene simulation is a key technology in the field of virtual reality. Stars, the moon and their mirror images in water are all special natural scenes when pilots flying across the sea. In order to generate a high quality night flying virtual reality system, a particle system was adopted ...
Intrusion detection response model based on cost-analysis
Dong Hong, Qiu Wanhua, Lü Junjie
2008, 34(01): 39-42.
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Applying the methodologies of game theory and network security, considering the decision interdependence of the players, a game model of intrusion response based on cost analysis was presented. The study showed the optimal strategies for the players in the deployment of security technique-Intrusion ...
Efficient probabilistic public-key encryption schemes with | n|+k bit plaintexts
Jiang Zhengtao, Liu Jianwei, Qin Bo, Wang Yumin
2008, 34(01): 43-46.
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Based on the intractable problems of n th residuosity and quadratic residuosity, by choosing proper parameters and without increasing the length of ciphertexts, the efficiency and the size of plaintexts of a probabilistic public-key encryption scheme proposed by Paillier and Pointcheval were improve...
Friction modeling and compensation of positioning stage driven by linear motors
Zhang Congpeng, Liu Qiang
2008, 34(01): 47-50.
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An H-type precise positioning table driven by dual linear motors was introduced. To decrease the velocity following error and positional error of the table, friction modeling and compensation of this precise positional system were studied. As the guide ways of the motion table have different frictio...
Numerical study for film cooling characteristics on rotating model
Yang Bin, Xu Guoqiang, Ding Shuiting, Tao Zhi
2008, 34(01): 51-54.
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Computations were performed to simulate the two rows of 90° staggered holes film cooling characteristics over a rotating turbine blade model both on leading and trailing surfaces. The influences of the Reynolds number Re, rotation number Rt and the blowing ratio M on the film cooling effectiveness η...
Distributed power aware topology control algorithm for self-organizing networks
Wang Zijian, Zhang Jun, Luo Xiling
2008, 34(01): 55-58.
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To efficiently use the power in self-organizing networks, a distributed power aware topology control algorithm for self-organizing networks was proposed, which integrates the minimum connected dominating set and the computational geometry. First, a power aware minimum connected dominating set (PAMCD...
Heading feedback in coaxal pilotless helicopter-s course flight
Li Hongwei, Zhang Xiaolin
2008, 34(01): 59-62.
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Soft simulation replicated the flight performence of coaxal pilotless helicopter controlled by classical navigation algorithm based on d(deviation distance) and its- variation ratio d · in various situations (undisturbed, constant gust disturbed). The heading bias, sideslip velocity and deviation di...
Modeling and semi-physical simulation of in-flight alignment for MIMU under large heading error
Cao Juanjuan, Fang Jiancheng, Sheng Wei
2008, 34(01): 63-66.
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The micro inertial measurement unit (MIMU) in micro unpiloted aerial vehicles initial alignment time is short, so in-flight alignment for MIMU is worked under large heading error with the global positioning system (GPS) assistant. Aimed at the requirement of high estimation precision and real time,a...
Computer generate force modeling and simulation framework
Ma Yaofei, Gong Guanghong
2008, 34(01): 67-70.
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The computer generate force(CGF) modeling and simulation framework tends to provide a development platform for CGF simulations. Reusability and composability are the foundation to achieve the goal of rapid development. The key technologies are identified by analyzing the development process by a top...
Getting parameters of absorbing structure based on genetic evolutional algorithm
Su Donglin, Qi Wanquan, Zhang Wei, Lu Zhanyong
2008, 34(01): 71-74.
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Electromagnetic parameters of unknown layer in absorbing structure were gotten. Model of calculated reflection coefficients was founded by the relation of material parameters and reflection coefficients based on transmission line theory. Reflection coefficients of different incident-angle was measur...
Analysis of landing response of virtual prototype landing gear
Liao Lijuan, Jia Yuhong
2008, 34(01): 75-78.
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The landing dynamics equations were educed with the establishment of two-mass equivalent model and the supplementary equations under the sideslip landing. An aircraft model with flexible fuselage using virtual prototype was applied basing on the mathematical models of landing gear in landing and ADA...
Strategy of state transition in UML based on Petri net
Yao Shuzhen, Jin Maozhong
2008, 34(01): 79-83.
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The related semantics of UML(unified modeling language) state machine view was analyzed, and basic features of Petri net and its capabilities of modeling concurrency, synchronization and conflict were discussed. In order to get unambiguous, executable and verifiable models, based on the CPN(colored ...
Technology on evaluating damage and reliability of aircraft structure fatigue critical parts
Wang Lei, Liu Wenting
2008, 34(01): 84-87.
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Analysis was started with character of fatigue failure and damage evolution of structure. The structure reliability analysis model which expressed in fatigue damage of critical parts was given. The damage and reliability evaluation technique and corresponding parameter index of fatigue critical part...
On-the-fly ambiguity resolution by restricting coordinates predicted by Doppler
Chai Yanju, Ou Jikun, Yuan Yunbin, Liu Genyou
2008, 34(01): 88-91.
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The main difficulty of kinematic positioning using carrier phase observations is the ill-posed problem of normal matrix. The float ambiguity and its covariance matrix are inaccurate, so impact the success rate of ambiguity resolution. A new method was put forward for resolving the ill-posed problem ...
Near-filed imaging method of two-dimension interferometric synthetic aperture radiometer
Hu Anyong, Liu Chongkan, Miao Jungang, Wan Guolong
2008, 34(01): 92-95.
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A near-field imaging method of two-dimension interferometric synthetic aperture radiometer was presented. Based on the principle of the two-dimension interferometric synthetic aperture radiometer and the near-field condition, the shortcomings of FFT(fast Fourier transform) imaging method were analyz...
Experimental and numerical investigation of controls for closed cavity flow
Li Jun, Zhang Qunfeng, Zeng Honggang, Li Tian
2008, 34(01): 96-99.
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The effects of control rod on the characteristic of the closed cavity flow and the sound pressure level (SPL) along the cavity bottom wall were investigated by means of the numerical simulation and wind tunnel test. Closed cavity flow was simulated by solving the 3D Favre-averaged Navier-Stokes equa...
Design of blinding analysis tool for satellite optical sensors
He Heng, Deng Jiati, Hu Lingyun
2008, 34(01): 100-103.
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In satellite configuration design, blinding analysis should be made to determine whether the optical sensor will fail due to being blinded by components of the satellite. A blinding analysis tool for satellite optical sensors was developed to replace the inefficient way of manual analysis. The desig...
3D solutions for static/vibration of FGPM plate/pipe in Hamiltonian system
Dai Haitao, Cheng Wei, Li Mingzhi
2008, 34(01): 104-107.
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The 3-dimensional couple equations of piezoelectric-mechanic were derived into Hamilton system by the principle of Hamilton theorem. The problem of single sort of variables was converted to double sorts of variables, and the Hamilton canonical equations were established. The dynamic characteristics ...
Time-domain low order equivalent system base on hybrid optimization algorithm
Zhang Xuemin, Fei Yuhua, Gao Jinyuan
2008, 34(01): 108-111.
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The order of modern highly augmented aircraft is very high. It should be reduced to it-s low order equivalent system (LOES) for evaluating the handling quality of aircraft and the design of flight control system. The time-domain equivalent matching can acquire on-line data of input and output, consi...
Development of PCI-based multi-axis controller
Wu Xingming, Chen Weihai, Yu Shouqian, Li Xiang
2008, 34(01): 112-116.
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The characteristics of a PCI(peripheral component interconnect)-based multi-axis real-time control system for realizing high-accuracy motion control were introduced. To reduce the workload from host computer and utilize the intelligence of DSP(digital signal processor) efficiently for a complex task...
Faster generation of LALR(1) parsers
Li Hu, Yang Xiaojin, Liu Chao
2008, 34(01): 117-121.
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Deremer & Pennello-s formula for computing LALR(1) lookaheads was studied in practice, by introducing a forward searching method for the computation of lookback and includes relations which were defined in the formula. Efficient algorithms for implementing of the two relations were designed. Sev...
Software architecture description technique based on template
Gao Hui, Zhang Li, Fan Zhiqiang
2008, 34(01): 122-126.
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The modeling elements of software architecture can be classified, and the classification is in fact a higher level of abstraction. In order to represent these abstraction levels, both of the software architecture template layer and the software template instance layer were defined by the template me...

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