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2009 Vol. 35, No. 11

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Optimization method of schemes of engine groups based on system reliability
Huang Min, Yang Jun, Zhao Yu, Tang Suping
2009, 35(11): 1287-1289.
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Abstract:
The power equipment of a large system consists of three engines, which has two kinds of design scheme: cold standby and down-rating. The cold standby design scheme is that two engines run in power rating and the left one is reserved; after one failure, the cold reserved engine is switched. Yet the d...
Tank self-pressurization process of N2O monopropellant micro-propulsion system
Sun Wei, Fang Jie, Cai Guobiao
2009, 35(11): 1290-1293.
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Abstract:
A ground experimental system was built to study the propellant-tank self-pressurization process of the sub-Newton-thrust N2O monopropellant propulsion system. Numerical simulation using a three-region lumped model was conducted to simulate the same process as well. Simulation results under adiabatic...
Attitude control technology of new-generation launch vehicles
Wu Yanshen, He Linshu
2009, 35(11): 1294-1297.
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Abstract:
A detail analysis was presented for attitude control design of new-generation launch vehicles. First, rigid body dynamics models and fluid sloshing dynamics models were developed based on Newton-Euler equations, and then elastic dynamics models which suggest a potential for interaction between attit...
Simulation of near-space airship based on wrinkle during ascent
Ma Yunpeng, Lü Mingyun, Wu Zhe, Liu Dongxu
2009, 35(11): 1298-1301.
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Abstract:
The material of the near-space airship film is nonlinear,anisotropic,viscoelastic and incompressible.Wrinkling will be present as the airship rises and inflates in the atmosphere.The expanding wrinkles can influence stress and strain of the film.Meanwhile,it can change dynamic action and thermodynam...
Relative position modification of SVM’s optimal hyperplane
Zhou Hao, Li Shaohong
2009, 35(11): 1302-1305.
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Abstract:
Through releasing the equal-margin constraint in the standard support vector machines (SVM), keeping the sum of the binary-class function margins, a new SVM was gotten within the framework of SVM. The separating hyperplane of the new SVM can be adjusted as per the distribution of the binary-class sa...
Computer analysis of transport aircraft oxygen system based on Flowmaster
Tu Yi, Lin Guiping, Li Guodong
2009, 35(11): 1306-1310.
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Abstract:
Transport aircraft oxygen system was discussed, and a computer analysis model of oxygen system was established in order to analyze the flow and distribution of oxygen in the whole pipeline network. This system was comprised of three parts. They were high pressure oxygen source, aircrew oxygen supply...
Optimal design of broadband matching network for electrically small antennas
Chen Aixin, Zhang Yanjun, Jiang Tiehua, Su Donglin
2009, 35(11): 1311-1314.
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Abstract:
A novel network topology for electrically small antennas was presented and verified successfully. An optimal design approach which combines the real frequency method and the direct numerical optimization was used to design the broadband matching network. According to the characteristic of an electri...
Design of flight control system based on inverse dynamics and center of gravity estimation
Zhang Jing, Shen Gongzhang, Yang Lingyu
2009, 35(11): 1315-1319.
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Abstract:
Due to the center of gravity varying over a specified range, the aircraft may deviate from its known dynamics, thus bringing special problems to the attitude control system. A synthesis approach based on in-flight estimation of center of gravity position and the inverse dynamics was proposed. First ...
Integrated reconfigurable flight control method for aircraft with multiple control effectors
Zhong Youwu, Yang Lingyu, Shen Gongzhang
2009, 35(11): 1320-1324.
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Abstract:
An integrated reconfigurable flight control design method, combining passive reconfigurable flight control with active reconfigurable flight control, was presented for enhancing flight safety. The robust flight control law was designed by the trajectory linearization control method. In addition, the...
Semantic Web service discovery based on WordNet ontology and PLSA
Xing Shaomin, Zhou Bosheng, Chen Tianying
2009, 35(11): 1325-1329.
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Abstract:
A semantic Web service discovery based on WordNet ontology and PLSA (Probabilistic Latent Semantic Analysis) was proposed. Firstly, the operation name, input parameters, output parameters and the query request were annotated by WordNet ontology. Then the annotated output parameters were taken as ter...
Infrared signature simulation model for space objects
Li Fubing, Xu Xiaojian
2009, 35(11): 1330-1334.
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Abstract:
Based on specified three-dimensional scene, an infrared signature simulation model for space objects was developed. Firstly, an object was geometrically modeled and decomposed into micro-elements in three-dimensions. Formulation for surface heating of the object with micro-motion dynamics from the s...
Correction of conservative smoothing approach used in SPH method
Long Liping, Zhang Jianyu, Zhao Libin
2009, 35(11): 1335-1338.
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Abstract:
The conservative smoothing approach (CSA) is a kind of methods which is very efficient for eliminating the instability of traditional smoothed particle hydrodynamics (SPH) method. Research discovered that total physical quantities of system (such as mass, moment and energy) were no longer strictly c...
FPGA-based hardware-efficient architecture for variable block-size motion estimation
Wang Rui, Jiang Hongxu, Li Bo
2009, 35(11): 1339-1343.
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Abstract:
To improve the hardware efficiency of the FPGA-based(field programmable gate array based)architecture for variable block-size motion estimation, a novel architecture was proposed, which was optimized in both area and speed. This architecture introduced RAM-based SAD(sum of absolute differences) accu...
Reentry guidance law design for RLV based on predictor-corrector method
Li Huifeng, Xie Ling
2009, 35(11): 1344-1348.
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Abstract:
A new on-line guidance law designed based on predictor-corrector method and quasi-equilibrium glide condition (QEGC) for the reentry of hypersonic reusable launch vehicles (RLV) was presented. This advanced guidance law can generate reasonable bank angle profiles which can simultaneously satisfy the...
Well-to-wheels analysis of large-scale bus diesel fuels
Gao Youshan, Li Xinghu
2009, 35(11): 1349-1352.
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Abstract:
Well-to-wheel assessment was used to evaluate the energy utilization and greenhouse gas emissions from crude oil extraction, transport, refining, namely well-to-tank (WTT), to vehicle operation, tank-to-wheel (TTW) for large-scale bus conformed to first and second phase of the fuel consumption limit...
Fuel thermal management system of high performance fighter aircraft
Gao Feng, Yuan Xiugan
2009, 35(11): 1353-1356.
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Abstract:
For improving the character of high-performance fighter aircraft, fuel thermal management system (FTMS) was put forward. FTMS uses fuel as the main heat sink of environmental control system (ECS) and other systems which need to be cooled. Thermal management system of F-22 fighter aircraft is a typic...
Multidisciplinary optimization of control-aerodynamic-stealth for flying wing aircraft design
Sun Yijie, Shen Gongzhang
2009, 35(11): 1357-1360.
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Abstract:
Flying wing is a widely applied configuration for advanced military aircraft. Not only should aerodynamic and stealth requirements be taken into account at its conceptual design stage, but also the flight control system should be well designed. A flying wing aircraft was investigated, and the strate...
CMAC neural network for the rudder dynamic load simulator of unmanned aerial vehicles
Yang Bo, Wang Junkui
2009, 35(11): 1361-1365.
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Abstract:
In order to solve the nonlinearity and the surplus torque disturbance in the rudder load simulator of the unmanned aerial vehicles, a hybrid controller was proposed with the cerebellar model articulation controller(CMAC) network and the traditional proportional-derivative(PD) controller. The CMAC ca...
Method for aerodynamic and structure integrative design
Ma Tielin, Ma Dongli, Zhang Shuo
2009, 35(11): 1366-1370.
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Abstract:
In order to apply aerodynamic and structure integrative design to engineering practice, a concurrent subspace optimization design method based on Pareto genetic algorithm(CSSODM-PGA) which is much more suitable for aerodynamic and structure multidisciplinary design optimization is brought out based ...
Image transmission over multipath fading channel using joint source channel coding modulation
Wang Zhe, Zhang Xiaolin, Chen Lei
2009, 35(11): 1371-1374.
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Abstract:
For multipath fading channel, an image transmission method which combines wavelet transform and orthogonal frequency division multiplexing (OFDM) adaptive modulation was proposed, and the algorithm for joint source channel optimal allocation of channel bandwidth and power was presented as well. Foll...
Spacecraft automatic test and spacecraft test language
Sun Bo, Ma Shilong, Yu Dan
2009, 35(11): 1375-1378.
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Abstract:
By the analysis of the spacecraft automatic test demands, the characteristics of test language for spacecraft automatic test were summed up, and two types of statements of spacecraft test language, that is, the regular test statements and the special test statements were given based on the analysis ...
Simulation on pressure regulator characteristic
Yu Zhongjun, Zhao Jingquan
2009, 35(11): 1379-1383.
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Abstract:
The pressure regulator’s structure and working process in aviation oxygen supply system (OSS) were explored and discussed. Based on reverse-type pressure regulator, combining with the theoretic structural model and dynamics of gas flow, the mathematic models for steady and dynamic characteristics we...
Use of X-ray pulsar-based navigation method on interplanetary trajectory
Yang Bo, Guo Xingcan, Yang Yong
2009, 35(11): 1384-1387.
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Abstract:
It is supposed that the X-ray pulsar-based navigation method (XPNAV) can provide high-precision navigation throughout the solar system, and its utility on the heliocentric transfer orbit was discussed. The search space array method was introduced to resolve integer pulse phase cycle ambiguities betw...
Sliding mode attitude control using momentum exchange device
Wang Lei, Zhao Yushan
2009, 35(11): 1388-1392.
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Abstract:
Modified rodrigues parameters(MRP) sliding mode control law was designed considering actuator character. Spacecraft attitude dynamics with double-gimbaled control moment gyro (DGCMG) and kinematics on MRP were founded. The model uncertainties was analyzed so that whether sliding mode control can be ...
Principal component analysis used in pulsed thermographic NDT of aluminum specimens
Guo Xingwang, Qidalatu
2009, 35(11): 1393-1397.
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Abstract:
To improve the defect detecting ability of pulsed infrared thermographic nondestructive testing (NDT) of aluminum specimens, the principal component analysis (PCA) method and its application in thermographic signal processing were studied. Some aspects of PCA, such as data preparation, algorithm and...
Generalized multiple-revolution Lambert algorithm for solving multiple-impulse rendezvous problem
Tong Kewei, Zhou Jianping, He Linshu, Zhang Liyan
2009, 35(11): 1398-1402.
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Abstract:
Techniques based on a high efficient high precision Battin multiple-revolution Lambert algorithm were extended to a generalized multiple-revolution Lambert algorithm which can consider orbital perturbations. The approach is difficult to understand but is high efficient with a simple calculation flow...
Simulation of liquid slosh in turning process of tank truck
Liu Kui, Kang Ning
2009, 35(11): 1403-1407.
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Abstract:
The liquid sloshing in turning process of tank truck was simulated by volume-of-fluid(VOF) model. The forces and turning moment of a single room were calculated. The results show that the maximum of Fy (force in direction y), Fz(force in direction z) and M (turning moment) increase when the centripe...
Real-time performance evaluation in WDM networks for avionics
Zhou Li, Zhao Ran, Yu Hang, Xiong Huagang
2009, 35(11): 1408-1412.
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Abstract:
To solve real-time performance evaluation problem in avionics wavelength division multiplexing (WDM) network, a method of end-to-end maximum delay calculation during multihop period message transmitting in WDM virtual topology was provided, based on network calculus analysis theory. A network model ...

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