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2004 Vol. 30, No. 05

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Agile turn control considerations for air-to-air missile with reaction jets control system
Wang Peng, Chen Wanchun, Zou Hui, Yin Xingliang
2004, 30(05): 395-399.
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The control problem of the air-to-air missile during the agile turn phase was investigated using the reaction jets control system, which can increase the off-borsight capability of short-range air-to-air missile and the capability of intercepting the rear hemispherical target. A method was proposed to control the orientation of the missile velocity by controlling the attitude of the missile, and this method proved feasible in theory. Considering the on-off property of thereaction jets control system, the sliding mode control method is used for attitude control. A sufficient condition for the reachability of the sliding mode is that the moment provided by the reaction jets control system should be no less than the maximum aerodynamical pitch moment. The feedback gain can be selected by nonlinear simulation or optimization. The results of nonlinear simulation showed once again the feasibility of the agile turn method proposed here. The sliding mode attitude control method also prove effective according to the results.
Selection of calculation model for contact sensing of robot hand using force/torque measurement
Han Zhuangzhi, Wang Tianmiao, Zhang Yuru, Liu Junchua
2004, 30(05): 400-404.
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In contact sensing of robot hands, force/torque sensor can be used to detect the position of contact points between the grasped object and the fingers. When hard finger contact model is used to calculate the points from the measured data, the solution may not exist. This problem was investigated under the contact models of hard finger and soft finger respectively. Mathematical verification was developed to find the existence condition of solutions. A simple criterion was provided to determine which contact model must be selected for calculating contact points. The criterion will guarantee the existence of solution. Experiments show that the reliable measurement of contact points can be achieved by this approach.
Study on asymmetrical systemic aerial confrontation
Huang Jun, Wu Zhe
2004, 30(05): 405-409.
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The generation compartmentalization and aerial combat capability of fighter aircraft were studied. A concept and its calculation method of asymmetry were put forward in the environment of systemic aerial confrontation. Based on the physicaldescription and mathematical models involved in systemic confrontation, the definition of battle superiority parameter under an asymmetrical condition was expanded. With the analyses of several typical campaign scenarios, i.e. a symmetrical, an asymmetrical and a supreme asymmetrical confrontation, by using of combat simulation approach, the issue of relationship between quality and quantity of fighter aircraft weapon systems was discussed. The research results show that the analysis taking into consideration the influence of asymmetry is more approximate to the essential current warfare. It is concluded that the inferior position on the quality side will be hard to be made up with superiority on the quantity side if the quality gap is quite big.
Robust control based on quantitative feedback theory for flight simulator
Fu Qiang, Er Lianjie, Zhao Guorong
2004, 30(05): 410-413.
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　To design the robust control system for flight simulator with large parameter uncertainty, quantitative feedback theory (QFT) was employed. The principle and design process of QFT were presented. The feedback controller and prefilter were designed using QFT, which make up of the control system of a certain flight simulator. The experiment result shows that the system keeps up perfect tracking performance when the loads of the flight simulator are changed. It indicates robustness of the system. The comparison with PID control demonstrates that QFT control is able to reject the friction nonlinearity. The anti-disturbance ability of QFT is very good. The application to flight simulator of QFT is successful. It shows the engineering value of the control method.
Interface delay model in NCS
Huang Siniu Chen Zongji, Wei Chen
2004, 30(05): 414-418.
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By uniting communication delays and the network interface, interface delay model was established for communication delays in network control system. And its key properties related to the practical applications were studied. The establishing of the interface delay model separates the research on network control system from the practical networks.
Aerodynamic estimation and trim analysis for a tethered balloon
Jiao Zhiqiang, Hong Guanxin, Yang Chao
2004, 30(05): 419-424.
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The aerodynamic characteristics of a tethered balloon with inverted "Y" fins were estimated by the traditional aerodynamic estimation from the flight dynamics analysis viewpoint. Taking into account the whole cable-body system, the nonlinear force trims equations and nonlinear moment trim equations were established and calculated. For the different wind speed, the equilibrium points could be got from the trim equations solving by Newton iteration method. Comparing the trim states of the different wind speed and different junction point of the cable, the better junction point of the rope could be confirmed.
Use shortcut trace method to improve the ray trace efficiency
Huang Peilin, Wang Ganglin, Wu Zhe
2004, 30(05): 425-428.
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The most part of calculating time in the traditional ray trace method is on the intersect judgment, so upgrading on this process is the key to improve the main calculating efficiency. A new technique named shortcut method was presented based on the fact that most nearby rays took a same reflection trace. So one ray was really calculated and its trace called shortcut was recorded as the reference to give direction to other rays next to it. The overwhelming search for the intersect point was avoided and the number of the really calculated rays was reduced a lot. By programming examination, the optimization arithmetic is proved to be fairly precise, remarkably efficient, and also practical.
Design and computational study of waverider configuration with high performance
Zhang Dongjun, Wang Yankui, Deng Xueying
2004, 30(05): 429-433.
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The design method and basic aerodynamic characteristics were studied for cone-derived waverider at Mach 6 and attack angle 0. Off-design performances of the designed waverider were also discussed, namely lift, drag and lift-drag-ratio changing with Mach number and attack angle. All the research works were finished by numerical simulation method. Results show that: the inverse-design method for the waverider configuration is successful based on inviscid conical shock wave. The biggest lift-drag ratio 3.36 considering viscous effects is obtained at Mach 6 when a proper base conical shock wave angle is chosen. A feasible flight control scheme is presented for the SSTO (single-stage-to-orbit) vehicle adopting this configuration. The favorable method of improving the lift-drag ratio of the figuration is brought forward.
Adaptive fading Kalman filter with applications in integrated navigation system
Geng Yanrui, Cui Zhongxing, Zhang Hongyue, Fang Jiancheng
2004, 30(05): 434-437.
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The reasons of the instability of Kalman filter were analyzed from the stability of Kalman filter. A new group of adaptive estimation methods of Kalman filter fading factor were developed and simulated in GPS/SINS(global position system and strapdown inertial navigation system) integrated navigation system. The characteristic that the filter residuals were zero-mean Gaussian white noise vectors was used and a chi-square distribution variable was made while computing the fading factor. The fading factor was computed by testing each element of the filter residual vector. The result shows that the proposed algorithms can estimate the fading factor adaptively, restrain filtering divergence and has the less computation burden than other algorithms.
Coupled helicopter rotor/propulsion/transmission system torsional vibration analytical model and coupled influence investigation
Xue Haifeng, Xiang Jinwu, Zhang Xiaogu
2004, 30(05): 438-443.
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　　　　To get methods avoiding system resonance, a practical analytical model of a helicopter's mechanic system of torsional oscillation was developed. The torsional system consisted of the helicopter's propulsion, the transmission system, the rotor and the tail rotor. The modal properties including modal frequencies and mode shapes of the torsional oscillation system were calculated and analyzed with eigen analysis and impedance matching method. The coupled modal properties were analyzed and compared with the hub fixed isolated rotor and the coupled rotor/propulsion/transmission system. The influence to the isolated blade and the rotor of coupled torsional system though changing rotor speed was gotten. Some effective methods to avoid resonance in designing were given.
Aerodynamic testing simulation facility for high-speed elevator
Duan Ying, Shen Gong, Zhang Yonggang, Su Wenbi
2004, 30(05): 444-447.
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Based on the non-dimensional analysis of parameters influencing the aerodynamic tunnel effect in high-speed elevators, a simplified testing facility was designed and set up. Significant physical parameters, including blockage ratios, open ratios, reserved ratios and distinct shapes of car head (cylindrical, parabolic, conical and spherical shape) were available in this facility. The instantaneous velocity distribution fields around different symmetrical heads and tails were measured by using DPIV (digital particle image velocimetry) systems. Results show it is distinct between cylindrical shape and other three shapes for the wake separation pattern but no separation is obvious around heads for all shapes.
Association rule mining algorithm in modeling quality activity chain based on quality cost data
Jiang Nan, Tang Xiaoqing
2004, 30(05): 448-451.
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The concept of activity-based quality cost was introduced, and the idea of describing the relationships among quality activities according to quality cost was discussed. The rules with which the activities acted on each other were defined. Because of the large amount of quality cost data, it was decided to apply the association rule mining technology to dig the relationships among quality activities. The association rule mining technology was emphasized, especially the Boolean association rules mining technology, which was used in the mining process. Applying Apriori algorithm,and using quality cost data and the trend of their changes, the model of the quality activity chain based on activity-based quality cost could be set up. This model can be used in the estimation and analysis of quality cost to find out the bottlenecks in quality management process from the economic view, and to provide effective ways to make decisions on quality improvements.
Flexible access control method of distributed objects
Lang Bo, Wu Qi, Lu You, Li Weiqin
2004, 30(05): 452-455.
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The traditional access control mechanism is bonded with the security policy it supports and can only support one policy. In order to establish a kind of access control mechanism supporting multiple polices, the meta-policy concept was introduced. By using the meta-policy description framework and the security policy model based on the meta-policy concept, a method of building flexible access control mechanism was put forward, which made the access control mechanism separate the security policy from the policy decision function and could dynamically support multiple security policies. The method is implemented in a CORBA-based system and the test results show that it is effective.
Research of digital holography PIV technique
Wei Runjie, Shen Gongxin, Ding Hanquan
2004, 30(05): 456-460.
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The principal formula of digital holography was deduced and verified from the analysis of holography using Hugeness-Fressnel theory and computer simulation. The thin focus depth of reconstructed 3-D digital image using in holography particle image velocimetry was created by a digital image phase filter method. The velocity vector field with 3-components in 3-D space was computed by 3-D cross-correlation algorithm with thin depth image slices after using phase filter and non-linear image filter. The 3-D vector and streamline results in a cubic flow field were achieved by using DHPIV technique. The results demonstrated an important step was made for the practicality of holography PIV.
Comparison between adaptive and biobjective optimization wing's aerodynamic features
Liu Hang, Zhu Ziqiang, Fu Hongyan, Yu Rixin
2004, 30(05): 461-465.
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Based on two dimensional airfoil adaptation, the deflected angles of leading edge and training edge of a three dimensions wing having 35° leading edge sweep angle, aspect ratio of 3.9, taper ratio of 0.17 and taking NACA65006 as wing section were calculated by using powell method to obtain an adaptive wing configuration having high lift/drag at subsonic/transsonic flight and low drag at supersonic flight. A biobjective optimizal wing was also designed for above 2 objectives, by using parallel Genetic Algorithm. The relative aerodynamical gains of both two optimal wings over the original wing were analyzed. Numerical results show that the adaptive wing can also obtain higher gains over the original and biobjective wings ,as illustrated in two dimensions.
Acquirement method of environmental factor with genetic algorithm
Fu Bo, Du Zhenhua, Zhao Yu, Huang Min
2004, 30(05): 466-468.
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One optimization method of acquiring the time environmental factor was proposed which made full use of the failure data from the same kind of products or the similar products in their development tests based upon the AMSAA model, One genetic algorithm method was used to the optimization process of acquiring the time environmental factor, the steps of the process were listed, and at last one practical application example was given. The research result indicated that the reliability evaluation result according to this method was nearer to the reliability level of the product in its practical use. And this method offers one reasonable way for integrated reliability evaluation using the failure data in product's development stage.
Research on product platform-based quality assurance in mass customization
Wang Xuecong, Tang Xiaoqing
2004, 30(05): 469-474.
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It brought forward the approaches of the quality assurance system in mass customization as a systematic engineering, which included systematically analyzing requirements to build a customer-centered product platform, re-engineering product relative processes, enhancing management of agile supply chain, and improving the quality of derived products by continuously improving the quality of the product platform. In practices, the result shows all of these approaches based on the technology of product platform will dedicate to help enterprises enhance the capabilities to meet the requirements of customer groups and individuals, and realize the objectives of steadily promoting customer satisfaction.
Kinematics analysis of slide redundant manipulator
Zhang Wu, Ding Xilun
2004, 30(05): 475-478.
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The design scheme of the slide redundant manipulator system was introduced. POE(product of exponential) method was applied to build the system model.Forward and inverse kinematics were analyzed. The system singularity avoidance method was studied, and simulation results were given to illustrate the effectiveness of the method. During kinematics analyzing, its geometry characteristics were considered to embody the idea that was both important to system analysis simplification and system property optimization. So the method has universality to a certain extent, and can be extend to analyze the other robot systems.
Algorithm study of air flow management based on grounding-hold
Li Shubo, Hong Guanxin, Zhao Yifei
2004, 30(05): 479-482.
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Aiming at the single airdrome grounding-hold problem,and according to the real instance of civil aviation in our country,two methods were combined,viz. linear programming and queuing theory,which are domestic primary method in settling this type of problem now．The arithmetic is a new one which possesses the virtues of that two methods．Then according to this arithmetic,the slot distributed system while releasing flights in the process of district control was emboldened． The example using the data of the airdromes in Beijing,Guangzhou,Shanghai and Wuhan was calculated,which validated the practicability of the system．
Fault detection and diagnosis of aero-starter-generator based on spectrum analyses
Qiu Yue, Liu Xiangqun, Zhang Hongyue
2004, 30(05): 483-487.
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Faults in aero-starter-generator by analyzing the spectrum of motor armature current could be effectively detected and diagnosed. Because rotation speed was fluctuating during the operation of the motor and the ripple of current was proportional to the speed fluctuating, if the sampling period of current was constant, the spectrum of current would spread over a wide range. The fuzziness of spectrum characteristics made fault detection and isolation difficult. While using sampling which was synchronized with the rotation speed this problem could be solved based on analysis of the resulted order ratio spectrum. Experiment on fault detection and isolation was conducted. Four faults (broken coil, broken connection between coil and commutator, short circuit between two neighboring conductors and eccentricity of the rotor) was successively detected and isolated using the proposed method.

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