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2007 Vol. 33, No. 11

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Multivariable robust lateral-directional control design for W-shaped tailless aircraft
Xiao Hua, Wang Lixin
2007, 33(11): 1257-1260.
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Abstract:
With the W-shaped tailless aircraft which is based on forward-swept wing configuration and the integrated design of blended wing-fuselage took as a control object, by the linear quadratic Gaussian with loop transfer recovery (LQG/LTR) method of multivariable robust control, the aircraft′s lateral-di...
New coning error compensation algorithm of strapdown inertial navigation system
Ding Yangbin, Man Shunqiang, Shen Gongxun
2007, 33(11): 1261-1263.
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Abstract:
Increasing the number of sample can improve the accuracy of error compensation while the rotation vector applied in strapdown inertial navigation system coning error compensation, however, limited with the performance of navigation computer, it is impossible to increase the number of sample sharply ...
Fuzzy control of landing gear based on MR damper
Jia Yuhong, Wu Xiaojuan
2007, 33(11): 1264-1267.
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Abstract:
Basing on rheological dynamics and the real condition of landing gear, the forces that pressed on the landing gear had been simplified and MR (Magneto-rheological or Magnetically Responsive) damper model was applied on landing gear. Annular gap structure was applied on the damper, so the damp force ...
Space debris lifetime algorithm from spacecraft breakup events
Wang Ting, Dong Yunfeng, Han Chao
2007, 33(11): 1268-1272.
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Abstract:
A method to calculate lifetime of debris generated from spacecraft breakup events was presented. Based on NASA standard spacecraft breakup model, a spacecraft breakup algorithm was given, which yields a set of parameters of produced fragments that can serve as input for lifetime calculation. Current...
Thermal radiation effects in the Lamilloy interior cooling passage
Tao Zhi, Lü Dong, Ding Shuiting, Cai Yi
2007, 33(11): 1273-1276.
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The heat transfer process of the Lamilly was analyzed, and the formulas for describing the thermal radiation inside the Lamilloy were provided under the suppose of configuration simplifying, for example, the complex surface cutting off and the infinity plate supposition. The thermal radiation and co...
Novel inertial stellar compass based on gyroscope-free micro inertial measurement unit
Qin Jie, Fang Jiancheng, Sheng Wei
2007, 33(11): 1277-1280.
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Abstract:
Micro/nano spacecrafts need an attitude determination system performance in high accuracy, compact size, small mass and low power consumption. A novel inertial stellar compass (ISC) was designed to meet these requirements, which based on the gyroscope-free micro inertial measurement unit (GFMIMU) an...
Numerical analysis on the flow and heat transfer in a rectangular passage with sub-scale fins
Xu Guoqiang, Wang Meng, Tao Zhi, Wu Hong
2007, 33(11): 1281-1285.
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Numeration analysis was made to simulate the flow and heat transfer in a rectangular passage with different configuration of sub-scale fins,the velocity fields, temperature fields and the average Nu were obtained, the enhancements of heat transfer were compared. The calculated results show that: the...
Triplex-redundancy control system for direct-drive-valve
Guo Hong, Yu Yongqiang, Xing Wei
2007, 33(11): 1286-1290.
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Abstract:
The design and implementation of a triplex-redundancy control system for direct-drive-valve (DDV) were presented. The total structure of the system was built up. The schemes of triplex-redundancy brushless DC motor, transducer and cross channel data link (CCDL) were analyzed. Meanwhile, the strategi...
Errors of antenna factor and improved method for NSA test
Su Donglin, Dai Fei, Xie Shuguo, Gao Wanfeng
2007, 33(11): 1291-1294.
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Abstract:
The normalized site attenuation (NSA) was studied during the test process. The measurement errors were mainly brought by the antenna factor, with the mutual impedance analysis. The standard method of measuring antenna factors was introduced and the mutual impedance effect was found to be neglected. ...
Artificial-neural-network adaptive control of compound actuator
Wen Zhaodong, Wang Zhanlin, Qi Xiaoye, Bao Lina
2007, 33(11): 1295-1298.
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To solve time-varying and nonlinear problem of the compound actuator ,the neural-network adaptive control principle was proposed. Establish the dynamic model of compound actuator using nonlinear auto-regressive moving average model, multi-layer perception neural network was used to identify the nonl...
Algorithm of constructing reduced-order H∞ controller for nonsingular plants in explicit form
Zhong Ruilin, Cheng Peng
2007, 33(11): 1299-1302.
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Abstract:
Algorithms of constructing reduced-order H∞ controllers in explicit form are only applied to singular H∞ control case. In order to apply these algorithms to nonsingular case, the matrix A of a generalized plant was divided into two parts A 0 and Δ A , then ( A 0, B 2, C 1, D 12) or ( A 0, B 1, C 2, ...
Design of control systems for missiles based on dynamic inversion and decentralized control
Zeng Xianfa, Zhang Lei, Shen Gongzhang
2007, 33(11): 1303-1307.
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Abstract:
Based on the nonlinear six degree-of-freedom missile model, the missile system was separated into four loops according to time-scale separation principle. Taking account of the fast loop and the relatively slow loop, the dynamic inversion controllers were designed in both of the two loops for decoup...
Multiple access protocol with QoS support for mobile Ad Hoc networks
Wang Dapeng, Liu Kai
2007, 33(11): 1308-1312.
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Based on the concept of random contention and collision resolution, a QoS-based multiple access (QMA) protocol for Ad Hoc networks was proposed to support multimedia service and multi-hop architecture. The traffic was divided into two groups with different requirements on delay, namely real-time tra...
Vision-based runway obstacle detection scheme for unmanned combat aerial vehicles
Chen Lei, Chen Zongji
2007, 33(11): 1313-1316.
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A computer-vision-based runway obstacle detection scheme for an unmanned combat air vehicle (UCAV) was presented. The scheme combined the advantages of the feature-based and the flow-based obstacle detection algorithms. Instead of using gradient-based method, a multi-scale optical flow estimation me...
Novel model of active vibration isolation based on giant magnetostrictive actuator
Zhang Xuhui, Liu Yongguang, Fu Yongling
2007, 33(11): 1317-1320.
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Abstract:
Through analyzing the constitutive relation of the giant magnetostrictive material, the main controllable factor constituting the output displacement for giant magntostrictive actuator was discussed. Upon which to investigate the key factors of single layer and one degree of freedom isolation platfo...
Application of improved BP algorithm in fuzzy neural networks
Fang Zhenyong, You Wenhu, Feng Rupeng
2007, 33(11): 1321-1324.
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Abstract:
Improved BP algorithm——momentum factor-adapted learning rate algorithm was cited. Based on BP algorithm, the adaptability was realized by momentum factor adjust and the learning rate to improve the learning speed and stabilization. By useing the algorithm in multilayer forward fuzzy neural networks ...
Design of an innovative vehicle intelligent collision warning model
Wang Jiangfeng, Gao Feng, Wang Jian
2007, 33(11): 1325-1328.
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According to the shortcoming of present single threshold intelligent vehicle collision warning model that it has single response time, a innovative collision warning model was designed based on multi-grade warning rules, which offers a gradual response time for driver, and can increase more react ti...
Analysis of the error of tuned gyroscope with fixing tilt angle
Luo Yufeng, Xu Chao, Fan Yaozu, Zhang Hai
2007, 33(11): 1329-1333.
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Abstract:
The gimbal ring and drive axis is impossible to coincide with the centre axis of gyroscope completely during the assembly process. The movement equation of the dynamically tuned gyroscope considering of the disturbing of fixing tilt angle with the theoretical mechanics was set up based on the analys...
Symmetric control of asymmetric cylinder
Zhang Xiaoning, Wang Yan, Fu Yongling
2007, 33(11): 1334-1339.
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The open loop gain and some parameters are different on the two moving directions of symmetric valve controlling asymmetric cylinder system. This difference leads to dynamic performance asymmetry on the two moving directions. The natural nonlinear and asymmetric system is difficult to control. The l...
LS-SVM method for dynamic weighing velocity compensation about loaders
Wang Tianmiao, Wang Wei, Wei Hongxing, Chen Diansheng
2007, 33(11): 1340-1344.
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Whether or not to compensate the oil pressure because of lift crane velocity reasonably, i.e., the velocity compensation was thought to be the key to obtain accurate dynamic weighing about loaders. After the method of dynamic weighing was given, the parameter inferring course of least square support...
Set-membership algorithm for identification of structural parameters based on ARMA time-series model
Wang Xiaojun, Qiu Zhiping, Wu Zhe
2007, 33(11): 1345-1348.
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Abstract:
Identification of structural parameters by using observation data with noise in time domain was studied. Autoregressive moving-average (ARMA) model of a vibrating structure was established, and the identification problem of structural parameters was transformed into the identification problem of par...
Surface free energy of basalt and glass fibers by contact angle method
Deng Rui, Li Min, Zhang Zuoguang, Jia Jingjing
2007, 33(11): 1349-1352.
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Abstract:
The surface free energies and their dispersion/polar components of basalt and glass fiber were investigated using dynamic contact angle analysis. According to Fowkes′ and Good′s theory,by making use of the contact angle values for monofiber surfaces and standard liquids with known values of surface ...
Variable-fidelity optimization system for turbine blade preliminary design
Han Qianpeng, Guo Li, Deng Jiati
2007, 33(11): 1353-1357.
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Variable-fidelity and multidisciplinary optimization approaches were presented and an automatic design system was developed for turbine blade preliminary design to improve design efficiency. The system integrated analysis tools and design teams, as well as data management system, which enabled perfo...
Application of electrochemical methods to corrosion resistance evaluation for carbon fiber/epoxy composites
Lü Xiaojun, Xiaojun Zhang, Qi Diao, Peng Xiang
2007, 33(11): 1358-1361.
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The influence of different kinds of solution immersion on the properties of carbon fiber reinforced plastics was studied by means of cyclic voltammetry curves (CV) and electrochemical impedance spectroscopy (EIS). The relationship between electrochemical parameters and corrosion degradation of compo...
Three-dimensional geological modeling based on hydro sections
Cheng Dan, Yang Qin, Zhang Yongbo, Jin Maozhong
2007, 33(11): 1362-1366.
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Since section is a common and valuable data model, a novel modeling method based on sections was proposed, namely "section information extraction", and modeling steps were presented. The matter to which attention should be paid and necessary preprocessing before modeling based on sections were analy...
Electronic-police system architecture based on Web Service
Zhao Hongtao, Li Chao, Sheng Hao, Xiong Zhang
2007, 33(11): 1367-1370.
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The traditional electronic-police system cannot adapt well to the requirements of enormous data in terms of compute speed, network-transport speed and storage capacity due to its excessive dependence on single server. Based on Web Service technology, the E-Police system architecture contained cluste...
Physical topology discovery algorithms based on inear dependency of traffics in IP network
Jin Yi, Shen Zengwei, Zhou Gang
2007, 33(11): 1371-1377.
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In IP network, general physical topology discovery algorithms are based on the network devices- AFT (address forward tables) which are obtained through SNMP (simple network management protocol). Unfortunately, the results of such algorithms are usually not exact or correct in practical networks for ...
Ring artifact correction for industrial CT images
Li Junjiang, Hu Shaoxing, Li Baolei, Yang Min
2007, 33(11): 1378-1382.
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Ring artifacts in computed tomography (CT) images are introduced by imperfect pixel channel in a detector. Ring artifacts degrade the CT image, hamper post processing and prohibit quantitative analysis. A set of algorithms that enable virtually complete ring artifact correction were proposed. Correc...

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