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2004 Vol. 30, No. 01

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Wind tunnel experimental study of aerodynamic interactions between a rotor and a body of a co-axial helicopter
Deng Yanmin, Hu Jizhong
2004, 30(01): 1-4.
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The results of rotors/fuselage aerodynamic interactions for the coaxial helicopter in hovering and forward flight were presented according wind-tunnel experiment. The presence of the rotor wake creates a significant down load on the fuselage which decreases with increasing advance ratio. The interac...
Theoretical investigation of vibration attenuation mechanism of a adaptive squeeze film damper
Ma Yanhong, Hong Jie, Zhao Fuan
2004, 30(01): 5-8.
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Vibration attenuation mechanism of an adaptive squeeze film damper with metal rubber outer-ring(ASFD/MRR) was investigated. Based on static strength analysis and motional analysis of an ASFD/MRR and an axes-s neck of rotor, Reynold equations were deduced from Nevier-Stockes equation and liquid conti...
Method for acquiring characteristic points in the calibration of line structure-light sensor
Xu Yuan, Zhang Guangjun, Wei Zhenzhong
2004, 30(01): 9-13.
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Based on the cross-ratio invariance theorem, a new method for acquiring characteristic points in the calibration of line structure-light sensor was proposed. A larger number of high precision characteristic points were easily acquired using this method and the designed calibration target. The proble...
Research and applications of radial basis process neural networks
Xu Shaohua, He Xingui
2004, 30(01): 14-17.
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A radial basis process neural networks model was proposed, which is a kind of three-layer forward structure constituted of input layer, radial basis function hidden layer and output layer. The transformation from input layer to hidden layer is nonlinear and that from hidden layer to output layer is ...
Multiple fading Kalman filter based on hypothesis testing
Zhuang Chaowen, Fu Li, Fan Yuezu
2004, 30(01): 18-22.
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A new multiple fading Kalman filtering algorithm was proposed based on hypothesis testing. The algorithm on-line modifies the noise covariance of the Kalman filter by the fading matrix using chi-square testing method so as to improve the accuracy and convergency of the Kalman filter when there exist...
Kinematics analysis of parallel mechanisms 3PSS
Guo Weidong, Han Xianguo, Chen Wuyi
2004, 30(01): 23-26.
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The kinematic characteristics of 3PSS parallel mechanism was thoroughly analyzed. It was proved in theory that the motion of the movable platform is translation, and this kinematic characteristics of the mechanism was validated by the virtue prototype technology using the software of the dynamic ana...
Implementation of the comprehensive situation display sub-system in the distributed virtual battlefield
Li Zhengyu, Shen Xukun
2004, 30(01): 27-30.
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In the distributed virtual battlefield environment, the comprehensive situation which displays sub-system is a major part of the management system. It takes charge of real-time displaying the state of all the entities in the virtual battlefield. To show the entities' information, the requirements of...
Dynamic characteristic analysis of rotating composite shell
Shi Yajie, Hong Jie, Wu Wei
2004, 30(01): 31-35.
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In the dynamic analysis of drum-type composite rotor, not only the dynamic behavior of rotor system but also the vibration characteristic of drum-type composite rotor should be studied. By reprogramming the finite element analysis software MSC/NASTRAN using DMAP program, the dynamic characteristic o...
Analysis of elevation error for radar seeker tracking low altitude target
Dang Qun, Lü Shanwei, Dong Shengbo
2004, 30(01): 36-39.
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The elevation error of seeker tracking low altitude target was affected by multipath propagation. The traditional ‘little plane’,which calculates diffuse reflection coefficients, was used in uniform terrain meshing. But uniformterrain meshing has a high error rate in big grazing angle. An improved m...
Design and analysis of an anthropomorphic finger joint for robotic dexterous hand
Liu Bo, Guo Weidong, Zhang Yuru
2004, 30(01): 40-42.
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One of the difficult problems in designing a robotic hand is to achieve the same size of the human counterpart with all the actuators integrated into the hand. The design of an anthropomorphic joint which provides pitch and yaw motions of the finger relative to the palm was described. The joint cons...
Effect of operational parameter on the heat transfer in a heat receiver
Cui Haiting, Yuan Xiugan, Xing Yuming
2004, 30(01): 43-46.
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It is possible to solve some problems using the three different multiple phase change material to replace single kind of high-temperature phase change material in heat receiver for NASA 2 kW solar dynamic power system. The heat receiver model was established. The corresponding numerical methods were...
Up and down method for DFR testing
Bao Rui, Zhang Jianyu, Chen Bo, Fei Binjun
2004, 30(01): 47-50.
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The up and down method to determine the detail fatigue rating (DFR) with experimentation was presented, which provides a more efficient way for DFR testing. Via numerical simulation, the half-sample maximum likelihood estimation method was proved to be effective to gain the mean value of fatigue str...
Study of a 3-DOF parallel manipulator dynamics based on Lagrange's equation
Bai Zhifu, Han Xianguo, Chen Wuyi
2004, 30(01): 51-54.
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Based on Lagrange's equation, the dynamic equation of a 3-DOF parallel manipulator was established and the drive force acted on the mechanism was given. Computer simulation was performed to investigate the driving forces variation when the platform moves along a circle and to study the force errors ...
High-speed circuit design in software radio
Cui Yingwei, Zhang Xiaolin
2004, 30(01): 55-58.
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The definition of high-speed circuit design as well as the signal integrity and timing problems in this design was introduced. The usual termination methods to remove reflection in high-speed circuit design were analyzed, and the simulation result of serial termination and parallel termination were ...
Strategy for updating the data of automatic topology discovery
Du Yushui, Zhou Gang, Ma Shilong, Dong Weiyu
2004, 30(01): 59-63.
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A strategy for updating the data obtained during the process of automatic topology discovery was presented. This strategy can be applied to the changes detected in time with the minimum cost, and several important problems which have to be faced in practice were discussed. In the end, the effectiven...
Study of dynamic responses of rotor systems to transverse forces
Shi Yajie, Lin Yun, Hong Jie
2004, 30(01): 64-69.
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The characteristics of the rotating stall and surge in axial compressors showed that it is the rotating stall that generates the force on the rotor in radial direction. A mathematic model of the force on rotor in radial direction was established to simulate the change of pressure in compressors. The...
Effects of stability factor on FDTD numerical calculation
Li Jun, Wu Zhenbo, Wu Zhe
2004, 30(01): 70-73.
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The function of stability factor was discussed in FDTD calculation. Modification formula of two-order Mur condition including stability factor was derived. Taking example for line source, effects of stability factor on absorbing boundary capability and numerical stability were studied. Plane wave wa...
Application of qualitative error analysis method in the mechanical navigation system
Chen Ming, Hu Jizhong, Cao Yihua
2004, 30(01): 74-78.
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The rigid-wake mode of co-axial rotor in forward flight was set up based on analysis of infinite blade rigid-wake mode. The method of aerodynamic characteristics of co-axial rotor in forward flight was studied by given rotor geometry, distance between upper and lower rotor, advance ratio. The exampl...
Cost analysis method of requirement product
Li Fan, Deng Jia
2004, 30(01): 79-82.
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To formulate the cost of requirement product is benefical to marketing localization of the product and it can encourage the design for cost. How to evaluate the product cost in the phase of requirement design was researched and a cost analysis method of requirement product based on requirement cost ...
Application of qualitative error analysis method in the mechanical navigation system
Hu Lei, Zhang Li-dan, Wang Tianmiao
2004, 30(01): 83-87.
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The qualitative error analysis of the mechanical navigation system was implemented using Taylor series expansion method after introduction of the system characters. The accuracy and effectiveness of this method were expressed by the compare results of qualitative analysis with specific experiment te...
Reliability simulation for the environment controlling system of the airplane
Yuan Lifeng, Wang Jun
2004, 30(01): 88-90.
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Based on the fault model and fault tree, the data of the environment control system of the airplane made in china were analyzed. After founding the reliability simulation model using the method of the invalidation, the simulation of this system was analyzed to get the conclusion. Then Some suggestio...
Heat and math transfer mathematical model and numerical computation of rotary dehumidifier
Liu Zhongbao, Wang Jun
2004, 30(01): 91-94.
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The heat and mass transfer mathematical model of a rotary solid desiccant dehumidifier was presented. Some comparison were made between the scheme of using gas from the outlet dehumidified to regenerate solid adsorbent and the one without using gas from the outlet dehumidified to regenerate solid ad...

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