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2008 Vol. 34, No. 11

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Environmental quality evaluation for submarine based on D-S theory
Pang Liping, Qu Hongquan
2008, 34(11): 1243-1246.
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The integrative environmental quality is very important to staff working in the submarine cabin. There are many factors affecting the integrated environmental quality in a submarine cabin, such as temperature, humidity, air trace contaminants, particle pollutants, microorganism and noise. To better ...
Influence of constant pressure valve on boosting character of by-pass flow type ECHPS
Liu Yahui, Gao Feng, Ji Xuewu
2008, 34(11): 1247-1249.
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Abstract:
The actuator in by-pass flow type electronically controlled hydraulic power steering (ECHPS) was solenoid valve. Boosting characters of ECHPS whose solenoid valves with and without constant pressure valve were analyzed and measured. The results show solenoid valve with or without constant pressure v...
Fuzzy control law design of hypersonic vehicle based on genetic algorithm
Li Huifeng, Wang Jian
2008, 34(11): 1250-1253.
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Considering the pitching channel of air breathing hypersonic vehicle X-43A as plant, flight control system was designed according to the 6 degree of freedom nonlinear model. The flight control system includes two loops, of which the structure is conventional mode. The guidance loop is a PD controlle...
LuGre-based compensation for friction in electro-hydraulic loading
Wang Xiaodong, Jiao Zongxia, Xie Shaochen
2008, 34(11): 1254-1257.
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Abstract:
In order to improve the control accuracy of electro-hydraulic loading system, the feed forward compensation method based on LuGre dynamic friction model was proposed to solve the friction problem. The mathematical model of electro-hydraulic loading system was built for friction simulation and compen...
Narrow-linewidth single-frequency single-polarization Er-doped fiber ring laser
Ou Pan, Jia Yudong, Zhang Chunxi, Wei Xingchun
2008, 34(11): 1258-1260.
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In order to acquire a stable narrow-linewidth single-frequency polarized Er-doped fiber laser, the ring fiber laser with a saturable absorber was studied. In the experiments, an un-pumped Er-doped fiber was used as saturable absorber to form an optical narrow-bandwidth filter, a fiber bragg grating ...
Framework for software reliability comprehensive evaluation based on grey system theory
Li Haifeng, Lu Minyan, Wang Zhixin, Li Zhen
2008, 34(11): 1261-1265.
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Abstract:
From the viewpoint of system engineering, a useful framework was explored for software reliability comprehensive evaluation based on grey system theory which has been acknowledged as a powerful technique for system comprehensive evaluation. According to the software quality model in ISO/IEC 9126, so...
Resource conflict detection and management in implementation of multi-level and collaborative projects
Qiao Lihong, Wang Chao
2008, 34(11): 1266-1271.
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To solve the resource conflict problem in multi-level and collaborative engineering projects in aviation and aerospace industries, the detection of resource conflicts was studied using a temporal constraint network algorithm. In the algorithm, a task relationship model for temporal constraint networ...
Extended state observer-based fault detection and recovery for flywheels
Jin Lei, Xu Shijie
2008, 34(11): 1272-1275.
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Flywheels are main actuators of satellite attitude control systems, and fault detection and recovery of flywheels is significant on keeping the normal satellite attitude. A high fidelity open-loop system of flywheel was modeled and the second order nonlinear continuous extended state observer(ESO) w...
Statistical language model adaptation based on N-gram distribution
Yin Jihao, Jiang Zhiguo, Fan Xiaozhong
2008, 34(11): 1276-1279.
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N-gram distribution can represent the characters of corpus correctly. So an approach was proposed for statistical language modeling adaptation, which is based on N-gram distribution. Given a large set of out-of-task training data, called training set, and a small set of task-special training data, c...
Design of coordinated control system for beam-carried cranes group based on RTK-GPS
Guo Zhongwei, Li Yunhua
2008, 34(11): 1280-1283.
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Abstract:
The coordinated control system for beam-carried cranes group used symmetrically laid two dual-frequency carrier phase real-time kinematic difference global position system(RTK-GPS) receivers to complete the large-scale beam-carrier-s position and direction measurement. Based on Kalman filter, the da...
Numerical simulation of heat transfer in rotating smooth square ducts using modified k-ω turbulence model
Tao Zhi, Xu Xueliang, Deng Hongwu, Zhu Jianqin
2008, 34(11): 1284-1287.
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A three-dimensional Navier-Stokes code with modified k-ε,k-ω(with new terms for Coriolis and rotational buoyancy) and standard k-ω turbulence models were used for prediction of flow and heat transfer characteristics for a rotating smooth square channel with radially outward flow. Comparisons between...
Variable selection based on principal basis analysis
Wang Huiwen, Yi Bin, Ye Ming
2008, 34(11): 1288-1291.
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A principal basis analysis method based on Gram-Schmidt process was proposed.Information deleted by Gram-Schmidt process was explained and proved.Principal basis and introduced its construction method was defined.The concept of net information ratio was also put forward to measure the information re...
Selective control mechanism for multi-datastream security in streaming media system
Xiao Chen, Ma Shilong, Lü Weifeng, Wang Lifeng
2008, 34(11): 1292-1297.
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Abstract:
Partial encryption and other media encryption schemes are effective approaches to encrypt the media data which are high volume and latency sensitive. However, use one media encryption scheme to protect all the media streams in a streaming media system will induce efficiency, scalability and security...
Quantitative evaluation of accelerated stress testing based on SSI
Li Xiaoyang, Jiang Tongmin
2008, 34(11): 1298-1302.
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In conducting accelerated stress testing (AST), to quantitatively evaluate reliability with respect to time by use of stress-strength interference (SSI) model, stochastic processes were introduced to describe stress and strength. Firstly,It was assumed that strength degradation and stress variation ...
U-transformation finite element method in analysis of Reissner rectangular plates
Chen Fuli, Jiang Chiping
2008, 34(11): 1303-1306.
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The U-transformation method was applied to the Reissner rectangular plates. The actual plate was extended to make up an equivalent cyclic periodicity system and the plate elements become cyclic periodic elements, whereby the stiffness matrix become a cyclic matrix and the finite element matrix equat...
Thermodynamic analysis and experimental verification of hydrogen production from dimethyl ether partial oxidation reforming
Song Lingjun, Li Xinghu
2008, 34(11): 1307-1310.
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Abstract:
Thermodynamic analysis was carried out for theoretical reaction of hydrogen produced from dimethyl ether(DME) partial oxidation reforming by using the element-potential method. The gas concentrations in the product gas were calculated under the constant-pressure and adiabatic condition as a function...
Novel filter algorithm of space-borne GPS orbit determination
Wu Zhihua, Ding Yangbin, Shen Gongxun
2008, 34(11): 1311-1314.
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Abstract:
When conventional EKF (extended Kalman filtering) algorithm was used in LEO (low earth orbit satellite) orbit determination by space-borne GPS (global positioning system). It is difficult to know the initial value of system noise variance. Therefore, the novel filter algorithm of orbit determination...
Fast algorithm for airborne SAR range cell migration correction
Zhang Kunhui
2008, 34(11): 1315-1318.
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The range-Doppler algorithm is quite popular in airborne synthetic aperture radar (SAR) image formation. To reduce the excessive computation load associated with the pixel by pixel interpolation required in traditional range Doppler algorithm (RDA) to remove range cell migration (RCM), a fast and in...
Parametric design of variational-wall-thickness blade body based on discrete data
Yu Weiwei, Song Yuwang, Xi Ping
2008, 34(11): 1319-1322.
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A new method about parametric design of variational-wall-thickness blade body was provided, which could effectively solve the problem that how to modify the blade cross shape. It is convenient and effective to adjust the blade wall thickness, then to improve the blade performance. An effective metho...
Simple scheduling algorithm for delay guarantee in VOQ architecture switches
Zhang Fuyang, Xiong Qingxu
2008, 34(11): 1323-1326.
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Combining the earliest deadline first (EDF) policy and round robin manner, a simple scheduling algorithm was proposed to provide flow-based deterministic delay guarantee in virtual output queueing (VOQ) architecture switches.The EDF policy was employed to arbitrate the flow competitions in VOQ queue...
Fast region merging algorithm for watershed transform based on adjacency list
Li Suqi, Zhang Guangjun
2008, 34(11): 1327-1330.
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A fast region merging algorithm was proposed to solve the oversegmentation problem produced by the watershed transform for image segmentation. Firstly, the gradient image was preprocessed with Lee filter to reduce the oversegmentation initially. Then the region adjacency graph (RAG) with its adjacen...
Adaptive fusion algorithm based on wavelet neural networks for multisensor measurement
Yuan Quan, Dong Chaoyang, Wang Qing
2008, 34(11): 1331-1334.
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Abstract:
To solve the problems of nonlinear and uncertain fusion systems, an adaptive fusion algorithm based on wavelet neural networks(WNNs) for multisensor measurement was proposed. The fusion system consisted of extended Kalman filters(EKFs), WNNs, knowledge base(KB) and track-to-track fusion algorithms. ...
Method for estimating quality of infrared small target image
Diao Weihe, Mao Xia, Dong Xuyang
2008, 34(11): 1335-1338.
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A new criterion named interferential degree of background was proposed to estimate the quality of infrared small target image. It was described quantitatively by two indicators, one is ‘confusion degree of background upon target’ which represents the ability of the background providing false targets...
Novel method of position determination for low earth orbiter micro-nano satellite based on nonlinear model predict filter
Zhong Huimin, Fang Jiancheng
2008, 34(11): 1339-1342.
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To solve two problems on micro-nano satellite that the dates of position and velocity is not consecutive for using global position system(GPS) individually and the errors of position and velocity radiate rapidly using orbital dynamics, a novel method of position determination for low earth orbiter( ...
Service-oriented business process modeling language
Xing Shaomin, Zhou Bosheng, Chen Tianying
2008, 34(11): 1343-1348.
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Abstract:
Through analysis of the existing business process modeling languages, their lack of service-oriented support was indicated. A new service-oriented visual business process modeling language VPML-S was proposed based on the existing visual process modeling language (VPML). The conceptual design framew...
Polynomial regression modeling based on Gram-Schmidt process
Wang Huiwen, Guo Lijuan
2008, 34(11): 1349-1352.
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The polynomial regression model is a widely applied nonlinear regression method. Since the high correlation exists among independent variables in the polynomial regression model, it will induce excessive computational error to estimate coefficients with the ordinary least square regression. A method...
Conductive error influence on temperature measurement
Cai Jing, Yang Yongjun, Liao Li, Wang Yi
2008, 34(11): 1353-1355.
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To study the conductive error of straight sensor, a special sensor was designed, which can measure 3 points- temperature, air flow, downside and upside of the bracket. The first and the third point were movable to meet the need of study. The theory model was set up and conductive correct coefficient...
Fast remote sensing image registration algorithm
Tian Yue, Zhang Yongmei, Li Bo
2008, 34(11): 1356-1359.
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Aiming at the registration of multi-sensor remote sensing images, a fast and effective image registration method was presented. Based on hierarchical candidate point set matching, the registration algorithm makes full use of the advantages of hierarchical matching and candidate point set matching ap...
Design method for surface of stretching tool for complex aircraft skin
Han Jinquan, Wan Min, Yuan Sheng, Xu Xudong
2008, 34(11): 1360-1363.
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Abstract:

A design method based on equilong section lines for tool surface in complex aircraft skin stretching was proposed to improve the strain distribution of blank during stretching, against the lack of practical and detailed design methods for tool surface in complex aircraft skin stretching. In this met...
Two-level task partition scheduling design in integrated modular avionics
He Feng, Song Liru, Xiong Huagang
2008, 34(11): 1364-1368.
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To solve the real-time partition schedule problem in the integrated modular avionics, a two-level hierarchical schedule model was proposed in which the operation system adopts round-robin scheduling strategy and each individual partition adopts dynamic priority scheduling strategy. For the schedulab...

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