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2008 Vol. 34, No. 05

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Analysis of aerodynamics characteristic of flexible wing caused by deflection
Zhang Hua, Ma Dongli, Ma Tielin
2008, 34(05): 487-490.
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Abstract:
A high-fidelity numerical simulation was presented for the flexible high-aspect ratio composite wing because of its high-speed nonlinear aeroelastic behavior. The fluid-structure interaction procedure used a loosely-coupled methodology. The compressible flow was modeled using the 3-D N-S equations o...
Multidisciplinary design optimization of flight control law and control effectors for plane
Zhang Dengfeng, Gao Jinyuan
2008, 34(05): 491-494.
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Abstract:
Based on approximate models and genetic arithmetic, a scheme for the plane with multi-flaps was proposed to implement the multidisciplinary design optimization (MDO) of full-envelope flight control law and control effectors- geometry & their placement. The robust gain-schedule control method was...
Studies on error of active optical pulse replicator
Yang Yi, Zheng Zheng, Li Zheng, Chen Yuxiao
2008, 34(05): 495-498.
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Abstract:
The replicating errors of active fiber loop replicator (AFLR) were discussed by using a dynamic model of noisy of semiconductor optical amplifier(SOA) and Monte-Carlo method. The replicating error changing due to the attenuation in fiber loop, the bias current of SOA, wavelength of assist light and ...
Analysis of scattering from serrated edge plate on aircraft with MLFMA
Liu Zhanhe, Huang Peilin, Wu Zhe, Gao Xu
2008, 34(05): 499-502.
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Combined field integral equation (CFIE), multilevel fast multipole algorithm (MLFMA) and conjugate grads method(CGM) were employed, and a modified truncation number had been presented to gain the precise scattering from objects efficiently and stably. It was exemplified that this new method could re...
Multirate digital phase generated carrier demodulation
Lan Tian, Zhang Chunxi, Li Lijing, Han Xiaojuan
2008, 34(05): 503-506.
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Based on the signal bandwidth in each phase generated carrier (PGC) demodulation procedure, a multirate demodulation scheme was proposed to solve the real time digital PGC demodulation problem at high sampling rate. The interfered output was analog-to-digital converted at high sampling rate to impro...
Helicopter rotor smoothing based on GRNN neural network and genetic algorithm
Liu Hongmei, Wang Shaoping, Ouyang Pingchao
2008, 34(05): 507-511.
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Abstract:
Considering traditional adjustment method without calculating possible nonlinear between rotor adjustments and fuselage vibration signals, a new rotor adjustment method based on general regression neural network (GRNN) and genetic algorithm was presented. GRNN network was employed to model the relat...
Hierarchical knowledge base in intelligent pilot-s assistant system
Song Han, Chen Zongji
2008, 34(05): 512-515.
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To realize knowledge base of intelligent pilot-s assistant system during the full flight course, hierarchical architecture based on task decomposition was adopted. The hierarchical knowledge base was proposed: task-judging level, field-judging level and aiding-making level. Cooperative team combat m...
Method in image-s feature extraction and matching
Zhang Shaohui, Shen Xiaorong, Fan Yaozu
2008, 34(05): 516-519.
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To solve the problem of adaptability and accuracy in the field of image feature extraction and feature matching, the method of scale invariant feature transform (SIFT) was introduced. Firstly the characteristics of the SIFT method were analyzed by theory, and the SIFT method was implemented step by ...
Multi-strategy GML application schema matching approach
Zhang Weiwei, Li Chao, Zeng Xiao, Xiong Zhang
2008, 34(05): 520-523.
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GML(geography markup language) application schema matching is a basic problem in the GML-based share of geography information. Combining the existing pattern matching algorithms and the characteristic of GML3.0 application schema, a multi-strategy GML application schema matching approach was propose...
Numerical simulation of tractive performance for planetary rover vehicle wheel by discrete element method
Li Wen, Gao Feng, Jia Yang, Sun Peng
2008, 34(05): 524-528.
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Abstract:
The numerical simulation for wheel-soil interaction was conducted by discrete element method (DEM) where the grouser-sections of wheels were rectangle, rec-trapezia, and triangle respectively. The distribution of contact reaction for soil particles was analyzed in the granular scales when they are d...
Multidisciplinary optimization in earth observation satellite main parameters
Tan Chunlin, Pang Baojun, Zhang Lingyan, Huang Hai
2008, 34(05): 529-532.
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Abstract:
A model of multidisciplinary design optimization (MDO) was established for the system parameter design problem of an earth observation satellite. It takes the observation performance as the objective of optimization, while the design variables and constraints are dealt with five main subsystems incl...
Method of any two-position alignment based on predictive filter for SINS
Gong Xiaolin, Fang Jiancheng
2008, 34(05): 533-536.
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Abstract:
Aiming at the initial alignment of strapdown inertial navigation system(SINS) with a large azimuth misalignment angle, the nonlinear mathematics model based on additive quaternion error(AQE) equations was established. And any two-position alignment method based on model predictive filter(MPF) and ex...
Experiment of heat release rate of pool fire effect on water mist fire suppression
Yang Lijun, Liao Shengjie, Fu Qingfei, Wang Xiangdong
2008, 34(05): 537-540.
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Abstract:
In order to research on fire extinguishing characteristics and rules of water mist under different heat release rate conditions, seven heptane-pan fire of different sizes were applied to single-nozzle and four-nozzle fire extinguishing experiments in the compartment of 4.6m×3.3m×4m. Thermocouple ...
License plate location based on Tophat transformation and text texture
Zhu Chengjun, Pu Juhua, Gao Lei, Xiong Zhang
2008, 34(05): 541-545.
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Abstract:
Because the scene where license plate recognition system is located in is more and more complicated, license plate location method should have better performance. A new license plate location method based on Tophat transformation and text texture was introduced. First, Tophat transformation was appl...
Performance evaluation and comparison of 2 porous laminated plates
Lü Dong, Tao Zhi, Deng Hongwu, Li Haiwang
2008, 34(05): 546-550.
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Abstract:
A new form of porous laminated plate (PLP), model 161, was put forth, which had 50% pin-fin quantity increasing compared with its conventional counterpart, model 141. The 2 models were studied on their flow resistance and heat transfer characteristics by experiment and numerical simulation. A therma...
Match analysis on two-stage turbo charging system of piston aero-engine
Xu Bin, Wei Ling, Zhao Peng
2008, 34(05): 551-554.
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Abstract:
To reach the motive force requirement of high altitude light aero-plane, a two-stage turbo charging system matching design analysis was performed for a turbo charging piston aero-engine. The software package of AVL boost was used to establish a theoretical analytic model of the supercharged prototyp...
Design of fuzzy pulse width modulation controller with accuracy and energy retrenchment applied to spacecraft
Zhou Yinqiang, Xu Lianxin, Jiang Yuxian
2008, 34(05): 555-559.
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The fuzzy proportional differential (PD) pulse width modulation (PWM) controller which adopts PWM and fuzzy PD control was introduced into accurate and energy-retrenched control for attitude and orbit of spacecraft. PWM can convert on-off type control to relevant accurate linear control, and fuzzy P...
Analytical calculation of focal spot size for lens antenna
Lü Shanwei, Zhang Yan, Yu Huilong, Li Yuying
2008, 34(05): 560-563.
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Abstract:
An analytical method was presented to calculate the focal spot size of the focal lens antenna. Firstly, the formulation for the 3dB focal spot size on the focal plane of the focal lens antenna was derived by Huygens-Fresnel principle. Then this formulation was simplified for convenience and the app...
Numerical modeling of high strain compression of anisotropic elastic open-cell foams
Lu Zixing, Chen Xin, Zhang Jialei
2008, 34(05): 564-567.
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Abstract:
Based on the anisotropic irregular model, the compressive mechanical properties of low-density open-cell elastic foams were simulated by finite element analysis. The compressive stress-strain curves and elastic collapse strength were obtained in order to investigate the influence of anisotropic rati...
Short fibre delayed self-heterodyne interferometer for ultranarrow laser linewidth measurement
Jia Yudong, Ou Pan, Yang Yuanhong, Zhang Chunxi
2008, 34(05): 568-571.
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Abstract:
Ultranarrow laser linewidth measurement using an shorter delay fibre to realize delayed self-heterodyne interferometer was described. The fundamental using delayed self-heterodyne to measure laser linewidth was analyzed, and the emulator was programmed based on the mathematical module. An experiment...
Texture image segmentation method based on wavelet packet transform and FCM clustring
Wu Yang, Yuan Yunneng
2008, 34(05): 572-575.
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Abstract:
A new method of optimal tree structure selection of wavelet transformation for image segmentation was presented. The standard pyramid-structure wavelet transform founded on the same recursive technique: only the low-pass outputs were used. It could not adjust the decomposition to accurate and effici...
Functional-driven resource aggregation:method and its implementing
Guo Haoming, Ma Shilong
2008, 34(05): 576-579.
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Abstract:
A dynamic and non-persistent mapping resource aggregation mechanism was proposed, through which functional-driven workflow system was formed in SOA (service oriented architecture)environment for application aggregation requirement. In the mechanism, services in application model were not static comp...
Comparation analysis of fill rate and backorder
Cheng Hailong, Kang Rui, Wei Yi, Qu Lili
2008, 34(05): 580-583.
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In order to solve the problem that how to choose the part level measuring parameter of supply support efficiency in spare supply provisioning, the mathematics means, physics means, the obtaining difficulty in practical use and the relationship of the same systemic efficiency measuring parameter of t...
Three-dimension numerical simulation of working process of space plasma sail
Yao Jie, Tang Haibin, Wang Haixing, Liu Yu
2008, 34(05): 584-586.
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Using three-dimension model, the hybrid particle in cell method was used to simulate the interaction between the inflated magnetic field and solar wind. The interaction between solar wind particles and dipole magnetic field produced by coil was studied after the plasma injecting into the dipole magn...
Implementation approach to information integration between PDM and ERP systems
Qiao Lihong, Zhang Yizhu
2008, 34(05): 587-591.
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Abstract:
An information conversion and integration method between product data management(PDM) systems and enterprise resource planning (ERP) systems was presented. Based on the information in PDM and ERP systems, an integrated information model was built to describe the information of materials, product hie...
Computational effects of ice accretion on aircraft longitudinal stability and control
Wang Mingfeng, Wang Lixin, Huang Chengtao
2008, 34(05): 592-595.
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A computational method was developed to predict the effects of airframe icing on aircraft flight dynamic characteristics according to atmospheric conditions, aircraft characteristics and flight conditions. Ice accretion scaling was performed by means of heat-transfer balance analysis, and aerodynami...
All-fiber laser radar at 1.55μm for speed measurement
Ma Zongfeng, Zhang Chunxi, Wang Xiaxiao, Wang Jiqiang
2008, 34(05): 596-599.
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Strict optical alignment is essential for conventional coherent laser radar to match the local oscillator (LO) and signal modes. The scheme and system design of simple, continuous-wave (CW) coherent laser radar at 1.55 μm for speed measurement were presented. The system was based on all fiber instru...
Coding technology in PDM oriented to automobile manufacturers
Wang Su, Guo Zhifeng, Yan Lijuan
2008, 34(05): 600-603.
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Abstract:
From the automobile manufacturers- informationization process, the design method and application were introduced. A kind of coding algorithm applied to automobile manufacturing enterprises on the basis of analysis of material coding method and production features of automobile manufacturing enterpri...
United algorithm base of multi-language machine translation system:difference function
Hu Yue, Gao Qingshi, Gao Xiaoyu
2008, 34(05): 604-608.
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Abstract:
In the multi-language machine translation system based on semantic linguistic theory, in order to realize the translation between different natural languages with one algorithm and one program, the ‘difference function’ was introduced. The function of ‘difference function’ is to hide the representat...
D-optimal six position testing method for dynamically tuned gyro
Fu Li, Liu Wenli
2008, 34(05): 609-612.
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The construction of a D-optimal six position experimental design for the two-degree of freedom dynamically tuned gyroscope was presented, in order to improve estimate accuracy of the acceleration-insensitive drift rate and acceleration-sensitive drift rate coefficients of the assumed error model at ...

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