Table of Content

31 August 2010, Volume 31 Issue 8

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Paper

Analysis for Starting Procedure of Single Piston Hydraulic Free-piston Diesel Engine

YUAN Shi-hua， WU Wei， JING Chong-bo， GUO Kai， ZHAO Zhen-feng

2010, 31(8):  1009-1013.  doi:10.3969/j.issn.1000-1093.2010.08.001

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In order to establish the starting procedure, the starting mode of a single pist

Numerical Calculation for Wear of Cylinder Liner and Piston Ring

WANG Xian-cheng, ZHANG Jing, SUN Yao-wen, FAN Bing

2010, 31(8):  1014-1019.  doi:10.3969/j.issn.1000-1093.2010.08.002

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In order to study the effects of operation conditions on the wear of engine cylinder liner and piston ring, taken a certain engine as example, a liner-ring lubrication model was established by using mean Reynolds equation. Then, the boundary conditions were determined according to the force equilibrium and cylinder thermal transfer equations. And, a sticking wear model was built on the basis of Holm-Achard wear mechanics. By using iterative algorithm, the influence of engine operation conditions was introduced in the lubrication and wear models. Finally, according to those models, the cylinder liner wear in a operation condition was calculated and compared with the test data. The results show that: their trends is consistent, and the error between them are lower than 5% near TDC.

Research on Nonlinearity State Estimation and Parameter Identification of Tank Gun Control System

YUAN Dong， MA Xiao-jun

2010, 31(8):  1020-1025.  doi:10.3969/j.issn.1000-1093.2010.08.003

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Considered the reciprocity between system state estimation and parameter identification, an extended state observer (ESO) independent from system model was set up to obtain the state variables in real time. Furthermore, a parameter identifier was designed on the basis of covariance modification least squares algorithm (CVMLS), so that the state variables and parameters of tank gun control system could be estimated simultaneously. The errors of ESO and CVMLS were analyzed, and then the condition-confined dynamic compensation was adopted to improve the identification precision. The performance of algorithm was verified by simulation. The research work lays a foundation of further theoretical research and engineering practice.

Simulation and Analysis for Dynamic Load Characteristic of Rail-gun

YANG Yu-dong, WANG Jian-xin, XUE Wen

2010, 31(8):  1026-1031.  doi:10.3969/j.issn.1000-1093.2010.08.004

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To design effective pulsed power supply for rail-gun, the load dynamic characte

Research on Protection Efficiency Test for Thermal Jacket of Gun Barrel

LIU Bo， PAN Hong-xia

2010, 31(8):  1032-1035.  doi:10.3969/j.issn.1000-1093.2010.08.005

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Aimed at the difficulty of the protection efficiency test system for the thermal

Research on Main Roller Layout in Bolt Carrier for Gatling Gun

XU Jian, BO Yu-cheng， LI Qiang， CHANG Xue-fang

2010, 31(8):  1036-1040.  doi:10.3969/j.issn.1000-1093.2010.08.006

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In order to research the relationship between the main roller layout in bolt car

Research on Fully Polarization Measurement of Nutation Parameters of Rotary Symmetric Target

LI Wen-chen, WANG Tao₁, WANG Xue-song₁, WANG Guo-yu₁

2010, 31(8):  1041-1047.  doi:10.3969/j.issn.1000-1093.2010.08.007

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The correct extraction of warheads' motion characteristics is the precondition of target recognition, and the nutation parameter is one of the important motion parameters. Based on the full polarization scatter matrix measurement, a nutation parameter estimation method was proposed in this paper. The motion characteristic and polarization scatter characteristics of the rotary symmetric warhead in ballistic midcourse were given. The nutation parameter estimation method based on global searching and feedback linear least squares estimation was proposed, which could be used to obtain the nutation period, nutation angle and the angle between nutation axis and LOS. The simulation results show the feasibility of this method, and its performance under noise condition is analyzed.

Numerical Simulation for Aerodynamic Characteristics of Diamondback Wing

WU Xiao-sheng, LEI Juan-mian， WU Jia-sheng

2010, 31(8):  1048-1052.  doi:10.3969/j.issn.1000-1093.2010.08.008

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Computational fluid dynamics and semi-empiric method were used to study the effect of Diamondback wing geometric parameters on its aerodynamic characteristics. The comparison of calculation and experiment results indicate that this method is accurate for the small and medium angle of attack. The aerofoil NACA64-108 can obviously increase the lift and lift-drag ratio of Diamondback wing. The aerodynamic interference between the front-wing-strip and rear-wing-strip will reduce the lift and increase the drag. The configuration that the front-wing-strip is higher than the rear-wing-strip can reduce the interference between two strips. If the height difference between two strips is 9 mm, the aerodynamic interference is minimum, and the lift-drag ratio reaches maximum.

A Novel Image Quality Evaluation Method Based on Structure Information Distribution

LIU Jie-yu, XU Jun-hui, WANG Li-xin

2010, 31(8):  1053-1058.  doi:10.3969/j.issn.1000-1093.2010.08.009

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The image quality evaluation is an important subject in image processing techniques. A novel method to evaluate the quality of distorted image is presented in this paper. It is based on a comparison between the structural information extracted from the distorted and the original images. The influences of the wavelet packet transform on the structural information and noise are analyzed first. Based on them, the average energy and intensity of the structural information can be acquired by using the wavelet packet transform. And they are taken as the evaluation indexes to establish the evaluation model. The simulation results show that the model can accurately reflect the image's objective quality.

Research on Apparent Temperature Difference in Infrared Imaging System

LV Xiang-yin, YANG Li

2010, 31(8):  1059-1062.  doi:10.3969/j.issn.1000-1093.2010.08.010

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Temperature difference is an important factor to determine the characteristic of

Study on Si-based ZnO Thin Film Grown on Aluminum Oxide Buffer Layer

XIANG Rong, WANG Xin₁, JIANG De-long₁, LI Ye₁, TIAN Jing-quan₁

2010, 31(8):  1063-1066.  doi:10.3969/j.issn.1000-1093.2010.08.011

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High quality ZnO thin films are often grown on lattice-matched substrate, for e

Experimental Research on the Cutting of High Nitrogen Austenitic Stainless Steel

ZHANG Hong-yong₁， CHEN Wei₂， LIU Yan-lin₂， PANG Xue-hui₁

2010, 31(8):  1067-1071.  doi:10.3969/j.issn.1000-1093.2010.08.012

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High nitrogen stainless steel is a sort of difficult-to-cut material. Based on analysis of the material characteristic, typical wear and failure forms of c

Research on Deformation Straightening for Aeronautical Monolithic Components

ZHANG Hong-wei, ZHANG Yi-du, WU Qiong, DAI Jun

2010, 31(8):  1072-1077.  doi:10.3969/j.issn.1000-1093.2010.08.013

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The deformation straightening was studied. The construction of original geometrical model with machining residual stress was accomplished in a collaborative simulation environment combining machining process with straightening process. A modified dichotomy was proposed to calculate the straightening parameters. The influences of different constrains and straightening loads on the straightening were compared and analyzed. The coupling effects of initial residual stress and the induced stress due to the straightening load were discussed. The typical curves were obtained to guide the correcting production based on the finite element simulation results. The straightening experiments were designed to validate the FE simulation. The experiment results show the feasibility and effectiveness of the finite element model.

A Robust Evaluation Method for the Effectiveness of Weapon Equipment Based on DEA and Its Application

RAN Jing-lu₁， XU Cheng₁， ZHOU Jian-ping, LI Shu-guang₃

2010, 31(8):  1078-1083.  doi:10.3969/j.issn.1000-1093.2010.08.014

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Taking aim at the problem that the traditional methods don't touch the ubiquitous risk

Experimental Investigation on Laser-driven Quasi-isentropic Compression

LI Mu, ZHAO Xiang-jie, ZHANG Hong-ping, YUAN Hong, ZHAO Jian-heng, SUN Cheng-wei

2010, 31(8):  1084-1089.  doi:10.3969/j.issn.1000-1093.2010.08.015

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The laser-driven plasma loading is a newly developed method to realize plane, dynamic and quasi-isentropic compression of solid materials. It is also a compression mode with high strain rate. This technique provides a new way for the research on the characteristics of the materials' quasi-isentropic compression and equations of state. The compression experiments for metal materials were successfully in a 100 J solid. The interface velocity histories of the Al/LiF sample were measured with a Dopple probe system. The compression peak can reach 7 GPa with strain rate of 10⁶ s^-1.

Simulation Study on Temperature and Infrared Radiation Characteristics of Flying Projectile

YUAN Yi-hui₁， ZHANG Jun-ju₁, CHEN Zuo-long₂, CHANG Ben-kang₁

2010, 31(8):  1090-1094.  doi:10.3969/j.issn.1000-1093.2010.08.016

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The infrared radiation of flying projectile depends on its surface temperature d

Research on Gyro's Dynamic Error of Miniature Attitude Reference System

LI Li, WANG Xian-cheng, HAN Shu, WANG Pu-kai

2010, 31(8):  1095-1098.  doi:10.3969/j.issn.1000-1093.2010.08.017

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A mathematical model of wave-making resistance was established to study the inf

Research Notes

Calculation of Wave-making Resistance and Analysis of Flow Field for Amphibious Armored Vehicles

XING Zhi-na, WANG Ju-xiang, SHEN Gang, YE Yong, LIU Jie

2010, 31(8):  1102-1105.  doi:10.3969/j.issn.1000-1093.2010.08.018

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In the near-infrared spectrum (NIR) quantitative analysis for propellant, the method of partial least squares is a good tool to establish the calibration model, but there are some problems, such as too much variables and variegated collinear of spectrum. A multivariate calibration modeling procedure called as interval and combination partial least square (icPLS) was applied to select the efficient spectral regions for building the flash point NIR model of aviation kerosene. The root mean square errors of prediction (RMSEP) and correlation coefficients (R₂) of icPLS and whole spectral partial least squares (PLS) were 1.08, 0.808 8 and 1.6, 0.738 1, respectively. The comparison of two methods indicates that the icPLS is more robust and credible than PLS. Furthermore, icPLS model can give more stable and accurate prediction results.

Application of Improved Partial Least Squares Method in Near-infrared Spectrum Analysis for Aviation Kerosene

LI Hui, QU Yi, GAO Xin, BO Bao-xue, LIU Guo-jun

2010, 31(8):  1106-1109.  doi:10.3969/j.issn.1000-1093.2010.08.019

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980 nm low divergence semiconductor lasers with optimized large optical cavity (LOC) structure was designed for high power single mode operation. The InGaAs strained quantum well (QW) laser material was grown with solid source molecular beam epitaxy (MBE) system. The high efficiency single mode lasers were fabricated with 3 μm stripe width and 750 μm cavity length. The maximum output power of 70 mW was achieved at 100 mA injection current at room temperature, with the maximum slope efficiency of 0.89 W/A and typical vertical divergent angle of 28°. The output power of the device reached 190 mW under 250 mA current and the device could operate at 70 ℃ reliably.

High Performance 980nm Single Mode Semiconductor Lasers

SHANG Fei₁， DU Hui-qian₂

2010, 31(8):  1110-1114.  doi:10.3969/j.issn.1000-1093.2010.08.020

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The compressive sampling provides a new frame for image acquiring under sub-Nyquist sampling rate. The optical flow calculation is widely used in computer vision system. In this paper, the compressive sampling theory is introduced to solve the optical flow calculation. Instead of using reconstructed original images, the optical flow field can be obtained by exploiting the spatial sparsity of gradient images and time shift feature of Fourier transform. The experiment results on real image sequence show that, under the same condition, this method is more efficient and needs less costs for sampling, communication and storage.

Optical Flow Calculation of Sequential Images Based on Compressive Sampling

LIN Yuan, LUO Si-wei, GAO Zhan

2010, 31(8):  1114-1119.  doi:10.3969/j.issn.1000-1093.2010.08.021

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In service-oriented grid environment, there are a great amount of various resources described in many different ways. And the traditional methods of grid resource retrieval do not fit the more and more complex grid environment, thus, it is very important to develop a reasonable and effective method to suit future grid system. This paper proposes a novel resource retrieval based on the user behavior feedback. It analyzes the user behavior according to history records, adopts the relevance feedback technique to analyze the grid resources and establishes a correlation model for them according to resource access path, access frequency, access time and retrieve results. This method makes the grid resource retrieval results closer to user's subjective perception and reduces semantic mix and ambiguity caused by heterogeneous grid environment. The experiment results show it can achieve a better retrieval accuracy.

A Grid Resource Retrieval Based on User Behavior Feedback

QUAN Wei-li， YAO Xiao-xian， LIN Fan

2010, 31(8):  1119-1123.  doi:10.3969/j.issn.1000-1093.2010.08.022

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Allowing for nonlinearity, mathematic models of the ram-air servo system were e

Modeling and Linearity Analysis of Ram-air Servo System

XIN Min, XIE Li-jing₁, WANG Xi-bin₁, SHI Wen-tian₁, YANG Hong-jian₁

2010, 31(8):  1125-1128.  doi:10.3969/j.issn.1000-1093.2010.08.023

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In order to settle the troubles in on-line deformation measurement of workpiece, a deformation prediction method based on artificial neutral network was proposed. The cutting experiment scheme was designed by using orthogonal experiment technique. The experiments in different milling parameters were carried out, the workpieces' deformations were measured, and the deformation prediction model was created by using a Back-Propagation neural network and taking the experiment data as its training examples. According to the validation of the additional production experiments, the model's accuracy in the scope of examples is 99.56% and better than 95.47% outside the scope of examples. The results show that the deformation prediction model can accurately reflect the relationship between deformation and milling parameters.

Prediction Model for Milling Deformation Based on Artificial Neural Network

CHEN Wei, YANG Ping-ping

2010, 31(8):  1130-1132.  doi:10.3969/j.issn.1000-1093.2010.08.024

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The muzzle velocity probable error is an important performance index of propellant. It influences the interior ballistic stability and reproducibility of the propellant greatly. In order to analysis the effect of gun barrel on the muzzle velocity probable error, the mathematical statistical method was used to analyze the muzzle velocity probable error obtained from experiments. The normality test, abnormal test and consistency test results show that the test date take normal distribution, the sample values are not abnormal, and the variance of the sample is almost equal, and the average value appears remarkable difference. The conclusion indicates different gun barrels put different influences on the muzzle velocity and probable of propellant. Obviously, the gun barrel quality is one of the influence factor of the muzzle velocity probable error.

Influence of Gun Barrel on Muzzle Velocity Probable Error

HU Jian, MA Da-wei, CHENG Xiang-hong, ZHOU Bai-ling

2010, 31(8):  1134-1133.  doi:10.3969/j.issn.1000-1093.2010.08.025

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Considered the huge calculation burden brought by the high dimension number of the centralized Kalman filter for the rapid transfer alignment and the poor robustness of Kalman filter, a federated strong tracking Kalman filter was adopted. Firstly, an estimation method of variance matrix based on fuzzy weighting coefficient was proposed to improve the accuracy of the traditional strong tracking filter. Then, the structure and algorithm of federated strong tracking Kalman filter were designed. To enhance the reconfiguration ability of federated filter by improving the robustness of sub-filters and to give consideration to the accuracy and calculation stability of sub-filters, an modified Elman network was proposed to adjust the information distribution coefficients adaptively according to some experiential rules. The simulation results show that this filter not only accelerates the calculation, but also improves the alignment accuracy, the system robustness and the rapid reconfiguration ability.