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2012 Vol. 38, No. 8

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Novel sliding-mode guidance law for supercavitating vehicles based on wake information
Li Huifeng, Zhang Rentian, Song Jia
2012, 38(8): 987-991.
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A novel sliding-mode guidance law was proposed making use of gradient information of ship wakes, to tackle the problems in current supercavitating vehicle such as poor maneuvering capability and limited detection methods.The wake gradient direction was dynamically determined according to the wakes of moving targets that were detected by the laser. The design of guidance law based on the sliding-mode theory guaranteed accurate tracking in the wake gradient direction till the final hits on the target ship. By using the wake information of targets, this scheme avoids the estimation of target motion states, which can benefit in reducing the energy consumption and improving the vehicle voyage significantly. Simulation results shows that the proposed method can guarantee the supercavitating vehicle-s rapid and accurate hits over targets, while at the same time, gaining strong robustness and interference immunity.
Improved determination algorithm using two vector measurements
Jiang Jie, Wang Yinglei, Zhang Guangjun
2012, 38(8): 992-995.
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To improve the spacecraft attitude determination accuracy and the computational efficiency of attitude matrix, an improved TRIAD algorithm was proposed. In this algorithm, the two observation vectors was weighted utilizing the variance of the measurement system, the weighting coefficient was selected according to the angle between the two observation vectors, the attitude matrix was solved using TRIAD algorithm, and then the matrix was amended. It shows that the computation time of this algorithm is half of the optimized TRIAD algorithm. When the measurement error of two sensors is difference, the accuracy of this algorithm is better than the optimized TRIAD algorithm for any angle of the two vectors. When the two sensors have the same measurement error, the accuracy of this algorithm is better than the optimized TRIAD algorithm except the angle of the two vectors is 90.
Optimal design of nominal attack of angle for re-entry vehicle
Li Huifeng, Zang Ran
2012, 38(8): 996-1000.
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The design of nominal attack of angle is important for re-entry vehicle. It is also a challenge because of constrains such as air heating, loading and dynamic pressure. A rapid optimal design method for nominal attack of angle was proposed. First the path constrains were converted into control constrain for attack of angle. Then the attack of angle was parameterized by four parameters. The genetic algorithm was used to obtain the initial guess of parameters. Finally the re-entry trajectory was solved by sequential quadratic programming(SQP) technique. The simulation results show that the method finds the optimal nominal attack of angle quickly and can be used for the re-entry trajectory optimization and guidance researches.
Fresnel transform based invariant moments extraction and object recognition method
Xue Bindang, Xing Yanqi
2012, 38(8): 1001-1004,1063.
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An invariant moments feature extraction method based on Fresnel transform was proposed, and applied to image recognition. The original image was mapped into the Fresnel diffraction projection space by using the Fresnel transform. The geometric or orthogonal moment invariants were extracted in the diffraction space, from which the characterization of the global image information can be obtained. The k-nearest neighbor classifier was employed to implement objects classification. Experimental results show that the proposed moment invariants extraction method achieves high recognition rates for different combinations of translation, scaling and rotation and is very robust to noise.
Experimental analysis on NOx generation and emission distribution off aviation afterburners
Wang Qi, Hu Xiaomin
2012, 38(8): 1005-1009.
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An afterburners was designed to get aviation engine extra thrust, but higher inlet temperature will generate higher NOx emission. One V style structure test facilities was adopted as an afterburners flow fields stabilizer, the section concentration of different NOx and O2 emission from the afterburners were analyzed in condition of inlet T 600 ℃ to outlet T 600~1 200 ℃,the test was fulfilled at 4 experimental conditions of same flux and flow fields.The results show that the chamber combustion is of "higher temperature, rich oxygen, poor fuel" characteristics,most Oxygen consumption in an afterburner chamber is contributed to generate CO2 and in the emission temperature scope of 800~1 200 ℃,the NO thermal generation is restrained and affected by incomplete combustion product CO evidently.
Adaptive chaos hybrid multi-objective genetic algorithm based on the Tent map
Nie Rui, Zhang Weiguo, Li Guangwen, Liu Xiaoxiong
2012, 38(8): 1010-1016.
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A modified algorithm which realized the tent map on the computer was proposed to deal effectively with the problem of fixed point and the small periodic of the tent map, which affected by the finite word-length of computer. The chaos research algorithm based on the modified Tent map was introduced to the multi-objective genetic algorithm. Firstly, the chaos sequence was applied to assign the initial population value to enhance the convergence ability. Then, the chaos search optimization algorithm was adopted to improve the diversity of the population. The benchmark problems were tested by the basic and the modified algorithm respectively. The statistical results show that the improved algorithm could seek the solution more efficiently, and achieve better convergence and diversity than basic NSGA-Ⅱ.
High precision periodic control method of control moment gyro gimbal system
Xu Xiangbo, Li Haitao, Xue Lijuan, Yang Lianhui
2012, 38(8): 1017-1021.
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In order to realize high periodic precision control of control moment gyro (CMG) gimbal system, a controller consisted of proportiona integration differention (PID) controller and plug-in repetitive controller was adopted. PID controller can realize high precision control of static state and uniform speed state, while plug-in repetitive controller can realize accurate tracking of periodic given signal. CMG gimbal system modeling was performed, and the PID controller and plug-in repetitive controller were designed, then stability conditions, steady tracking properties and ability of suppressing disturbance were analyzed. Simulation and experiment results show plug-in repetitive controller can effectively reduce steady tracking error when CMG gimbal system tracks a 1Hz periodic given velocity signal. The structure of the controller is simple and the plug-in repetitive controller can be designed separated from system’s PID controller, so it is easy to design parameters.
Main parameters of multi-purpose guided missile fuse and warhead optimization
Du Zheng, Wang Chaozhi
2012, 38(8): 1022-1026.
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For the current deficiencies of multi-purpose guided missile kill probability model against helicopter, the importance of vulnerability blade unit factors concept was introduced, laser fuse actuation model and warhead condition kill probability model of rotor blades were established by Monte Carlo method and kinetics theory with new ideas, which provided necessary mathematical tools for the accurate and objective analysis of multi-purpose guided missile kill probability against helicopter. Based on the establishment of multi-purpose guided missile kill probability model, the main parameters of multi-purpose guided missile fuse and warhead were optimized by multi-objective optimization. Results show that the single multi-purpose guided missile lethality performance and the parameters of fuse and war-head can improve significantly by the optimizing.
Drive line modeling and shift characteristic simulation of automatic transmission powertrain system
Dai Zhenkun, Liu Yanfang, Xu Xiangyang, Wang Shuhan
2012, 38(8): 1027-1031.
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Based on the dynamic characteristic of the shifting elements of automatic transmission while shifting, a kinetic mathematic model of the shifting process was set up. Engine model was set up with engine speed, throttle and drive mode as parameters. The shifting strategy was designed with the vehicle data, and an oil pressure control method for shifting elements during shifting process was suggested. Based on the software platform MathCAD, a complete virtual prototype for the powertrain system was built including driver, mechanical system and control system etc. Simulation results show that the built simulation prototype and platform can predict the dynamic characteristic of the powertrain system under different driving cases, and so provides a proper solution for the simulation of shifting strategy and quality.
Propagation of engineering change based on characteristic linkage perspective
Yang Fan, Tang Xiaoqing
2012, 38(8): 1032-1039.
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The propagation of change from characteristic linkage perspective was analyzed. The characteristic relations were categorized into two types, and their propagation features were discussed. Two modes of change propagation were elicited and the process model of change propagation was proposed. The model provides a basis for the optimization of change solutions and evaluation of propagation risk. A case study coming from an example of cylinder design was provided to validate the propagating mechanism.
Optimization of repairable spare parts based on combat unit mission success
Wang Rui, Li Qingmin, Ruan Mingzhi, Peng Yingwu
2012, 38(8): 1040-1045.
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After analyzing combat unit mission and support flow of spare parts, combat unit mission success evaluation model in two-echelon support system was established based on the METRIC principle, which hot redundancy and cold redundancy of equipment systems were taken into account. The stock cost was taken as the optimization object and combat unit mission success probability was used as the restriction. Based on margin analysis method, the computation method for spare parts optimization was provided. Finally, an example was given to validate the optimization model, and the optimization results were coincident with the military practice case by analyzing. This would help equipment support commander make support decision in support concept design before mission operating.
Investigation on scale factor and output nonlinearity in resonator micro-optic gyro
Hong Lingfei, Zhang Chunxi, Feng Lishuang, Yu Huaiyong
2012, 38(8): 1046-1050.
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The output nonlinearity of the resonator micro-optic gyro (RMOG) becomes significant along with the increase of the rotation rate. The influence on the scale factor and output nonlinearity by bias-frequency-modulation rate was theoretically analyzed. Corresponding to the resonant characteristics of the RMOG, theoretical scale factor and output nonlinearity within the rotation rate range were calculated. Furthermore, analysis on scale factor error induced by temperature was carried out. RMOG experimental system was set up, with the scale factor of ~0.95. Nonlinearity of 6.88 10-4 and 0.93% in the region from 500( )/s to +500( )/s were reliably achieved in the simulated and real rotational test, expressing the output nonlinearity can be low enough for most inertial application with proper countermeasure to eliminate the influence from the environment.
Self-adaption link-quality detection algorithm for data collecting in OSN
Wang Xiao, Wu Yinfeng, Yu Ning, Wan Jiangwen
2012, 38(8): 1051-1055.
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In order to implement the data collecting in opportunistic sensor network (OSN), a self-adaption link-quality detection algorithm (SLDA) was proposed to enhance the prediction accuracy of the link and the data transmission rate. The new scheme adopted self-adaptive link-quality detection strategy to measure the real-time link quality weight factor, then it was combined with energy consumption model of mobile nodes to quantitatively predict optimal transmission link for message forwarding by means of the unscented Kalman filter (UKF). Simulation results show that SLDA increases the average delivery ratio and reduces the average delay in OSN, and performs well in the situation of sparse deployment of mobile nodes.
Fault localization based on non-parametric hypothesis testing model
Ye Gang, Li Zhongwen, Yu Dan, Ma Shilong
2012, 38(8): 1056-1063.
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The size of failed runs and the distributions of the evaluation biases on the Siemens suite were investigated. The empirical results show that the precondition for the central limit theorem and the assumption on feature spectra forming normal distributions are not well-supported by empirical data. Thus, the previous method based on parametric hypothesis testing has a potential problem. New approaches based on non-parametric hypothesis testing models were proposed. The empirical results on the Siemens suite indicate that these approaches can outperform existing predicate-based statistical fault localization techniques, especially on non-normal distributions. The effectiveness comparison between two methods based on two popular non-parametric hypothesis testing models was also investigated. One method was based on the Kolmogorov-Smirnov test and the other was based on Cram閞-von-Mises criterion. The comparison results show that the method based on the Kolmogorov-Smirnov test consistently outperforms that based on the Cram閞-von-Mises criterion in the task of fault localization.
Reliability-based robust optimization design for rubber fluid cell forming process
Wang Miao, Li Dongsheng, Li Xiaoqiang, Yang Weijun
2012, 38(8): 1064-1069.
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The inherent variations that exist in aluminum alloy sheet properties, process parameters and other random factors effect forming quality of rubber fluid cell forming process. Oriented to precision manufacturing of aircraft, a reliability-based robust optimization design approach for rubber fluid cell forming process based on robust optimization design and reasonable reliability constraints was proposed. The reliability-based robust optimization design solution with the traditional optimization design solution was compared, and the typical flanging parts of 2B06-O aluminum alloy sheet in rubber fluid cell forming were used to verify the practicability and validity. The results show that the proposed approach made quality performance indicators less sensitive to uncertainties, and improved the robustness and reliability of the rubber forming process.
Digital simulation model design and analysis of piezoelectric cantilever beam smart elements
Wang Lei, Ren Bingyin, Zou Hornsen
2012, 38(8): 1070-1074,1095.
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According to the vibration control of piezoelectric laminated structronic thin shell system, a new method for vibration characteristic analysis by using special digital circuit model of smart elements was presented. By means of the finite difference discretization method, the dynamic partial differential equations of the cantilever beam, sensing signal and piezoelectric control moments were transformed to finite difference equations. Dynamics smart elements matrix model based on Newmark-β integration method was established. DSP circuits of smart element simulation systems were fabricated to simulate the output characteristics of the piezoelectric structronic cantilever beam systems under lower modes with different finite difference mesh elements and different integration time steps. The results with different control methods are more precise than that of the analog circuit model in relevant reference. This method provides a new approach for the vibration simulation analysis of piezoelectric structronic systems.
Space time interleaving code
Sun Peng, Li Daoben
2012, 38(8): 1075-1079.
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Multi input multi output system in frequency selective channel provides space and frequency diversity at the same time. Traditional space time codes suffer from rate loss or diversity order loss. Space time interleaving code (STIC) achieves full space and frequency diversity without rate loss. Random interleavers are embedded on different transmit antennas. Thus it is easy to apply the code to various number of transmit antennas. In order to simplify the complexity of STIC decoding, two kinds of iterative decoding structures were designed. One is passing extrinsic information between convolutional constraint and equalization constraint, the other is passing iteratively between summing constraint, convolutional constraint and equalization constraint. The simplified iterative decoders lower the receiver complexity from growing exponentially with the number of transmit antennas to growing approximately linearly with the number of transmit antennas. STIC not only achieves full rate full diversity but also makes it easy to implement in practice. Numerical experiments are implemented to prove the observations.
Novel circuit of memristor and its chaotic dynamics characteristics
Wang Xiaoyuan, Qi Weigui, Wang Xingyuan
2012, 38(8): 1080-1084.
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A new method of memristor circuit implement was presented. This way is based on the definition of flux-control memristor, firstly, the flux was constructed, and then using the flux to control the memductance which was embodied by the photocell of the light dependent resistor (LDR). Finally, an analog model of memristor which can be used as a two terminal element in both simulations and experiments for future research on memristor applications was implemented. The experimental results are shown, and the mathematical model of the LDR memristor was used to instead of the nonlinear diode in Chua-s circuit, in order to study the chaotic characteristic of such a LDR memristor based Chua-s circuit, which will show the feasibility for using a HP memristor to get a chaotic circuit.
Root extending section of turbine blade modeling method based on guide curves
Zhu Qian, Ning Tao, Xi Ping
2012, 38(8): 1085-1089.
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Root extending section of turbine blade is a kind of complex transition surface, of which the design process is complicated. According to geometric and structural characteristics of root extending section, a modeling method based on guide curves was provided. It initially generates guide curves by utilizing boundary conditions of root extending section, and then improves guide curves by applying minimizing energy method, finally conducts modeling of root extending section based on guide curves. This modeling method realizes the modification of area size of a cross section at a given height. The parametric design module of root extending section was developed. Therefore, the method improves the efficiency of turbine blade design, and contributes reference for parametric modeling of complicated transition surfaces of aircraft engines.
Decomposition method of equipment quality characteristic based on STT and fuzzy QFD
Guo Jingyi, Sun Yufeng, Wu Hanxue, Zhao Guangyan
2012, 38(8): 1090-1095.
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Integrative quality characteristic is an important indicator of the system project for equipment. On the basis of strategy to task technique (STT), fuzzy quality function deployment (QFD) and ADC model for evaluating weapon effectiveness, a decomposition method of equipment integrative quality characteristic was proposed. Equipment structure and mission were decomposed with this method; then, the whole system effectiveness was broken down into some key quality characteristics relating missions and lower function systems; finally a system effectiveness model formed based on these characteristics. The result makes reference to evaluate different system projects for the equipment and to choose the key quality characteristics working on the system effectiveness.
Real time simulation for lunar dust blown by engine exhaust plume
Fu Xiaojing, Wang Cheng, Dai Shuling
2012, 38(8): 1096-1100.
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The spray of lunar dust at a lunar landing site is necessary for lunar soft landing simulation. For the model that predicted trajectories of lunar dust blown by the engine exhaust is too simple and the 3D visualization is not strong sense of reality, a physics-based simulation for real-time movement of lunar dust was presented. Using computational fluid dynamics(CFD) and Quadratic Shepard’s interpolation, the lunar dust particle trajectory path was simulated by analyzing and computing the ballistics model. A set of particles in the lunar particle system was extracted by analyzing number of particles, initial position, initial velocity, life cycle and other parameters on particle kinematics and variation. Lunar dust particle system based on the particle set was built. The results show lunar dust particles propelled by engine exhaust including jumping, splashing, diffusing and dissipating with visual realism and good real-time. This method has a certain significance for studying trajectories of lunar dust in a vacuum and other related fields. The method has been successfully applied in simulation system of a lunar soft landing.
Thermal analysis of high speed permanent magnet brushless DC motor
Du Guohua, Fang Jiancheng, Liu Xiquan, Zhou Yinfeng
2012, 38(8): 1101-1105,1128.
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In order to solve the problems of reduction in magnetic performance and winding insulation damage caused by high temperature in high speed permanent magnet brushless DC motor, a series of research on temperature distribution and improvement was carried out. The thermal network mathematic model was established by lumped parameters method. And an analytic equation accounting for the relationship among motor loss, thermal conductance and temperature was derived. Besides, the motor 3D finite element model was built based on the ANSYS/Workbench, and steady-state analysis was conducted. The temperature distribution of the whole motor was achieved, which verified the results of thermal network model. And two methods including changing the retaining sleeve material and drilling holes on shaft were proposed to solve the temperature problem. According to the analysis results the rotor temperature has dropped obviously, especially the retaining sleeve and permanent magnet with a temperature decrease of about 34℃ and 54℃ respectively.
Transfer time delay model of data link and its compensation
Feng Zhonghua, Wang Xinlong, Wang Bin
2012, 38(8): 1106-1110.
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Based on the analysis of the data transmission process, models of the system service time and waiting time which affect the data transmission were established by utilizing the queue theory; An adaptive kalman filtering algorithm based on "current" statistical model was proposed to compensate the data transmission delay. Simulation results showed that data transmission delay compensation could not only obviously reduce the target measurement errors, but also greatly improve the target acquisition probability.
Missile launching dynamic simulation based on variation model
Kang Tian, He Weiliang
2012, 38(8): 1111-1117.
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An alternative approach to establish missile launching dynamic simulation system based on variation model was presented. The variation models were built according to their respective original sources. The variation forces and moments were added to the standard ones. The resultant was employed to solve the state of motion. This simulation system based on variation model could be used to analyze the effect of each interfering element upon launching precision; and it also could be employed in numeric targeting experiment. This method was applied to some ship-based inclined launching missile. Including launcher vibration, propulsion eccentricity, track uneven and ship movement, the effects of these interfering elements upon the initial disturbances were discussed. A 5 000-time numeric targeting experiment was carried out. On specified distribution of the interference, the hitting probability was up to 93.86%.
Principle of machining variant curvature blending surfaces with counter torus cutter
Huang Wei, Chen Zhitong, Chen Wuyi, He Ying
2012, 38(8): 1118-1123.
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Based on the stripe-width-maximization machining theory and the principle of global curvature fitting, a novel counter torus cutter, which uses the inner surface of torus as the cutting edge, was proposed to machine the leading and trailing edge of a turbine blade. Through optimizing the raw angle of the counter torus cutter with a circular generatrix of given radius, the envelope surface of the tool can closely approximate the leading and trailing edge surface of the turbine blade with variant curvature, which can be machined by maximizing the machining strip width and minimizing the number of tool paths under a given tolerance. An experiment to machine the leading and trailing edge of an aero-engine turbine blade was carried out. Results illustrate that the proposed method could greatly improve the machining quality of the leading and trailing edge, and the machining strip-width using a counter torus cutter is 5 times larger than that using a ball nose cutter.
Orbital rendezvous control method for berthing and tracking approach
Hou Yunyi, Jing Qianfeng, Ma Guangfu
2012, 38(8): 1124-1128.
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The spacecraft orbital rendezvous technology is required for many missions, and the requirements of orbital control vary with the different tasks. In some cases, the tracker will be asked to stop in specified position temporarily; in other cases, the line-of-sight angle and trajectory are limited in the process of orbital rendezvous. To meet the different needs of various tasks, a closed-loop feedback control law was designed. By using this method of orbital control, the tracker can stop and keep in fixed point and approach target along the predetermined trajectory. The simulation shows that the control method has the advantages of fast tracking speed, high-accuracy, and low power consumption.

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