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2011 Vol. 37, No. 8

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Turbulence modeling validation in hypersonic flows
Geng Yunfei, Yan Chao, Xu Jinglei, Kang Honglin
2011, 37(8): 907-911.
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Abstract:
To provide accurate numerical solutions for selected supersonic/hypersonic flow fields and to compare and evaluate the performance of selected turbulence models with experimental results,four popular turbulence models were tested and validated against experimental data of two turbulent flows. The in...
Damage mechanics method to predict the fatigue life of 3-D structural members under spectrum load
Meng Xianhong, Bai Zhaoyu, Zhang Xing
2011, 37(8): 912-917,932.
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Abstract:
A conservative integral of three dimensional structures in damage mechanics was established. The expression of the stress and the strain considering the effect of damage coupling was deduced by means of the path independent property of this integral and the condition of small scale damage. Based on ...
Control response analysis of small coaxial helicopter in hovering state
Xu Guanfeng, Chen Ming
2011, 37(8): 918-922.
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Abstract:
Based on the engineering reality, a calculation model of the rotor unsteady aerodynamics of the small coaxial helicopter in hovering state was set up. An airfoil unsteady aerodynamic model was established by introducing a set of Leishman-Beddoes semi-empirical indicial response formula. The induced ...
Experiment and simulation of impinging coaxial gas-gas injector
Gao Yushan, Chen Ze, Li Mao, Cai Guobiao
2011, 37(8): 923-926.
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Abstract:
In order to investigate the effect of design parameters of gas-gas injector on mixing and combustion characteristics, experiment and numerical simulation were conducted on the injectors which had an angle that gaseous hydrogen impinge gaseous oxygen. Hot fire tests were carried out to investigate th...
Flutter analysis for rudder considering actuator’s dynamics
Zhang Xintan, Wu Zhigang, Yang Chao
2011, 37(8): 927-932.
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Abstract:
Missile rudder-s flutter characteristics are influenced by the actuator-s impedance. Two new methods which can analyze the rudder-s flutter stabilities were used respectively in time domain and frequency domain. Stability judgement of the state matrix was required in the time domain method. Actuator...
Modeling and tradeoff of aircraft survivability based on combat capability
Wang Huaiwei, Li Shulin, Tong Zhongxiang
2011, 37(8): 933-936,947.
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Abstract:
There is a deficiency in existent model when calculating aircraft survivability in active self-defense,a new calculating model was proposed. Relationship among aircraft-threat-survivability-combat capability was analyzed by combination of attack and defense. The calculating model involving aircraft ...
Analysis of effects of BWB airliner design parameters on its economic profitability
Zhao Zhigao, Zhang Shuguang
2011, 37(8): 937-942.
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Abstract:
In order to analyze economic profitability due to high cruise L/D and higher engine performance of blended wing body (BWB) airliner, the methods of estimating major parameters and calculating flight performance were imposed. Using fuel flow per capita (Fuel/km/seat) as the weighing standard, quantit...
Effects of driving load and pipe diameter on flow characteristic of two-phase boiling water
Ma Qicheng, Song Baoyin, Shan Shaorong
2011, 37(8): 943-947.
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Abstract:
The centrifugal force resulted from a rotational platform was used to simulate the flying load and the experiment of two-phase boiling water flowing in different diameter pipes under driving load was conducted. By changing the parameters, such as driving load, pipe diameter, flow rate, and so on, so...
Measure of reaction wheels disturbance considering coupling effect
Zhang Pengfei, Cheng Wei, Zhao Yu
2011, 37(8): 948-952.
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Abstract:
The micro-disturbance of reaction wheel assembly (RWA) is a key factor which will affect the accuracy of spacecraft attitude control. To obtain the disturbance characteristics,the RWA disturbance was meaured,corresponding control methods and isolation systems were adopted to restrain them. The distu...
Mechanical ergonomics analysis of capstan partial pressure suit under pressure
Zhang Chunguang, Ding Li, Qin Zhifeng, Xiao Huajun
2011, 37(8): 953-957.
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Abstract:
To discuss the human operating ergonomics at different pressure level for the capstan partial pressure suit (PPS),range of motion (ROM), operational flexibility, grip strength test and subjective survey were performed by ten male subjects while wearing PPS under 6 pressures. The control group was un...
Variable selection in discriminant analysis based on Gram-Schmidt process
Wang Huiwen, Chen Meiling, Gilbert Saporta
2011, 37(8): 958-961.
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Abstract:
A new linear discriminant analysis modeling method based on Gram-Schmidt process was introduced, which firstly selected the most effective variables for classification in the independent variables set. In the meantime, the insignificant variables and the redundant information were identified and rem...
Weakly-hard real-time scheduling algorithm for wireless networks
Jiang Yule, Wang Hailiang, Xiong Huagang
2011, 37(8): 962-967,996.
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Abstract:
A (m, k)-firm scheduling algorithm combined with wireless channel state consideration was proposed. The algorithm classified the messages into mandatory ones and optional ones, and scheduled the mandatory messages in higher priority. The message type was jointly decided by static offline assignment ...
Steady state circular performance simulation of automobile based on orthogonal test
Jiang Libiao, Hou Wenchao, Gu Fangde
2011, 37(8): 968-972.
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Abstract:
The perfect combination of virtual simulation technology and orthogonal experimental design methods provides a new idea for the automotive product development. The research of steady state circular performance of automobile can follow the following steps. A virtual prototype model of a car was estab...
Axial radial magnetic bearing in magnetic suspending switched reluctance motor application
Zhao Xusheng, Deng Zhiquan, Wang Bo
2011, 37(8): 973-978.
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Abstract:
To overcome the defects of the present permanent magnet biased axial radial magnetic bearing, a new permanent magnet biased axial radial magnetic bearing (PARMB) was studied, which was used in magnetic suspending switched reluctance motor application. The configuration and fundamental principle of P...
Accuracy analysis and synthesis of 3-RPS parallel machine based on orthogonal design
Li Xinyou, Chen Wuyi, Han Xianguo
2011, 37(8): 979-984.
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Abstract:
To analyze the influence degree of pose parameters on pose errors, and to guarantee the accuracy requirements of 3-RPS parallel mechanism in the whole workspace, the orthogonal design method was adopted for accuracy analysis and accuracy synthesis. According to the orthogonal design method, three po...
Calculation and error analysis of the electric field for a quasi-reciprocal optical voltage sensor
Feng Xiujuan, Zhang Chunxi, Yu Jia, Li Chuansheng
2011, 37(8): 985-989.
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Abstract:
The optical sensing element in transverse modulation configuration utilizing the Bi4Ge3O12 (BGO) crystal was designed for a novel optical voltage sensor with quasi-reciprocal reflective optical circuit. The numerical calculation of electric field was performed using the finite element analysis based...
Key technology on PROFIBUS-DP master gateway
Xia Jiqiang, Liang Chaozhong, Geng Chunming, Chen Xuejun
2011, 37(8): 990-996.
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Abstract:
To solve the problem that distribute control system is difficult to integrate standard PROFIBUS-DP slaves, gateway solution was proposed. After comparing several existing gateway solutions, soft core implementation was adopted. Hardware platform which was compatible with two solutions and supported ...
Voice coil motor for direct drive valve optimization design by means of particle swarm optimization
Wu Shuai, Wang Dayu, Xing Qiujun, Jiao Zongxia
2011, 37(8): 997-1000.
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Abstract:
Voice coil motor (VCM) direct drive valve (DDV) is a type servo valve which utilize the VCM drive spool directly and its dynamic characteristic is depends on the performance of VCM. Unfortunately, some of design parameters of VCM are contradictory when ambition the best performance, it always need t...
Adaptive sampling frequency offset estimation algorithm for OFDM system
Sun Yuming, Zhang Yanzhong, Shao Dingrong, Li Shujian
2011, 37(8): 1001-1005.
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Abstract:
The estimation formula of sampling frequency offset estimation algorithm based on data decision was corrected. An orthogonal frequency division multiplexing (OFDM) system adaptive sampling frequency offset estimation algorithm was presented. The frequency offset change using discrete pilots to find ...
Whole life-cycle costing analysis of pneumatic actuators
Zhang Yeming, Cai Maolin
2011, 37(8): 1006-1010.
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Abstract:
Combined with the concept of air consumption and specific energy, and analyzed the energy consumption of pneumatic actuator, a power consumption calculation method of pneumatic actuator was proposed. In order to solve purchasing cost allocation problem of public pneumatic devices, a novel air equipm...
Die-face compensation algorithm in stretch forming of aircraft skin over reconfigurable compliant tooling
Wang Lili, Li Dongsheng, Li Xiaoqiang, Luo Hongyu
2011, 37(8): 1011-1016,1020.
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Abstract:

Two finite element models of a single curvature part, discrete and equivalent models of stretch forming over reconfigurable compliant tooling, were set up. The calculation times, rubber deformations and part shapes in two models were compared. The result shows the equivalent model is reliable and mo...
Life prediction of thrust bearings based on accelerated wear test
Zhou Yuhui, Kang Rui, Su Li, Wu Jianjun
2011, 37(8): 1016-1020.
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Abstract:

The life prediction of thrust bearings was gotten by using accelerated wear test based on degradation model for the life verification of the thrust bearings with good wear-resisting property, and its life prediction model for the accelerated wear test was proposed. Based on the analysis of the failu...
Cycleslips detecting approach for single frequency GPS Users
Gao Shuliang, Huang Zhigang, Li Rui
2011, 37(8): 1021-1025.
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Abstract:
Aiming at the detection of the cycle slips in the carrier phase measurements for the single-frequency global pesition system(GPS) users, a novel algorithm was proposed based on the conventional method with the combination of the pseudo range and the carrier phase. The pseudo range and the carrier ph...
Coordinates conversion of software radar based on improved CORDIC algorithm
Xia Dong, Cha Hao, Zhou Mo, Huang Ying
2011, 37(8): 1026-1029.
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Abstract:
Radar data processing and terminal display realized by software on general-purpose computer becomes a trend now. And fast conversion from polar coordinates to orthogonal coordinates is required in real-time radar-s display. The value of azimuth angle increases evenly in radar display processing, and...
High-accuracy frequency estimation algorithm based on autocorrelation and phase difference method
Yang Dezhao, Song Ningfang, Lin Zhili, Ou Pan
2011, 37(8): 1030-1033,1043.
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Abstract:
In order to improve the frequency estimation accuracy of sinusoidal signal in white Gaussian noise, the correlation length m of the algorithm based on the autocorrelation operation was derived, and the equation representing the relationship of m and signal-to-noise ratio (SNR) was acquired. Given th...
Realistic rendering of virtual earth in real-time application
Wang Cheng, Dai Shuling
2011, 37(8): 1034-1038.
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Abstract:
A new approach was proposed to enhance realism of virtual earth in VR-based real-time applications. A virtual earth which had 21 600×10 800 pixels surface texture, bumping surface and shine of atmosphere was constructed.The whole virtual earth was cut into 128 parts and then the position of vertices...
Determination of corrective maintenance task item for materiel
Mao Yilan, Kang Rui, Ma Lin, Xu Zhehan
2011, 37(8): 1039-1043.
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Abstract:
In order to achieve the integrality of the supportability analysis during the development phase of materiel, the determination method of corrective maintenance task items was presented based on the characteristics of failure mode, effects and criticality analysis(FMECA), the calculation of semantic ...
High voltage pulse electron beam control strategy and influence on weld bead shape
Xu Haiying, Yu Wei, Zuo Congjin
2011, 37(8): 1044-1048.
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A 150 kV/30 kW high voltage pulse electron beam welding power source was developed. The bias pulse power source topology and control technique about base beam current, peak beam current, pulse beam duty, pulse beam frequency were introduced. Not only the biggest peak beam current up to 200 mA has be...

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