2004 Vol. 30, No. 06

Display Method:
Steering law design for SGCMGs taking gimbal servo characteristics into account
Wu Zhong, Chou Wusheng
2004, 30(06): 489-492.
Abstract:
Gimbal servo systems of single gimbal control moment gyroscopes (SGCMGs) are often assumed to have ideal tracking performance during the steering law design. The tracking performance can be decreased due to the finite bandwidth and various disturbances of gimbal servo systems. In order to attenuate ...
Development of airborne intelligent power supply system
Li Yunhua, Wang Zhanlin
2004, 30(06): 493-497.
Abstract:
Aiming at the problems of the increase in orifice loss caused by high pressure and large power of the airborne hydraulic power system, a kind of intelligent power supply system which sets operation mode and reference input according to the assignment of the airplane was proposed. The control and man...
Analysis and realization of aircraft structural synchronously economic maintenance and safety inspection
Chen Bo, Bao Rui, Zhang Jianyu, Fei Binjun
2004, 30(06): 498-501.
Abstract:
The economic performance will be obviously promoted if the maintenance and safety inspection could be carried out at the same time. By studying the influence factors, an analysis method was presented to decrease the repaired times by synchronously performing the economic maintenance and safety inspe...
Automatic program evaluation system base on LAN
Wang Zhuowei, Yin Baolin
2004, 30(06): 502-505.
Abstract:
The distributed automatic program evaluation architecture provided a more effective, veracious and applicable mechanism to implement a program evaluation system. By using the Trojan technology in passive mode, the architecture ensured the security in communication and evaluation, and it didn't make ...
Study for the best selection of rule conditions in automated extraction of fuzzy diagnostic rules
Qi Yi, Shen Shituan, Li Yihua
2004, 30(06): 506-511.
Abstract:
In the machine learning of fuzzy rules for the diagnostic expert systems, the best selection of rule conditions is one of the most important steps. A new fuzzy nearness function was proposed, and the overlap degree of the rule conditions was evaluated to get an evaluated matrix with this function. A...
Experiment investigation on transient heat transfer in rotor-stator system with high-positioned air inflow
Luo Xiang, Xu Guoqiang, Ding Shuiting, Tao Zhi
2004, 30(06): 512-515.
Abstract:
A gas turbine disk was simplified to be a shrouded rotor-stator system with high-positioned air inflow, the rotor was heated at rim. The rotor diameter was 400 mm and its maximal rotating speed was up to 3000 r/min. Transient heat transfer characteristics of the rotor were investigated experimentall...
High angle-of-attack control law design based on global stability analysis
Li Kang, Fang Zhenping
2004, 30(06): 516-519.
Abstract:
A global stability analysis was presented to guide high angle-of-attack (AOA) control law design for nonlinear aircraft dynamic system. Bifurcation analysis was firstly explored to investigate the structural stability of nonlinear aircraft dynamic system at high AOA. Then by reasonably selecting equ...
Analysis of wave propagation in the built-up structures of rod-beam and beam-beam
Xing Yufeng, Wang Lijuan
2004, 30(06): 520-523.
Abstract:
The impact problems of a rod on a Timoshenko beam and a Timoshenko beam on another Timoshenko beam were analyzed by means of the indirect mode superposition method(IMSM). A rod on a beam and a beam on another beam are both typical built-up structures. The displacement compatible equations of the two...
DTW based quantitative fault diagnosis of gas path component in turbofan
Xu Bo, Tang Hailong, Li Xingshan
2004, 30(06): 524-528.
Abstract:
A quantitative fault diagnosis method was presented based on pattern recognition principles for gas path component in turbofan. The method consists of a preprocessing step for multivariate dynamic data, where the magnitude dependent information is standardized, and a similarity assessment step via D...
Visualization of network topology with hierarchical display layout
Xie Hongman, Qian Depei, Luan Zhongzhi, Chen Heng
2004, 30(06): 529-533.
Abstract:
The network topology discovery is indispensable for a network management system.Visualizing the topology of complex network systems is an efficient way to grasp the topological structure of the network quickly.A new visualization method,which applies to the display of the topology of middle or small...
System architecture and software design of high-dynamic GPS signal simulator
Kou Yanhong, Chang Qing, Zhang Qishan
2004, 30(06): 534-538.
Abstract:
The hardware-in-the-loop system architecture of GPS simulator was presented, which was flexible, expansible and capable of real rime test, and a data-collecting GPS receiver was introduced into the system. The mathematic model of high-dynamic GPS signal was derived, and it was suggested to add two p...
Modeling and analysis of a force interaction system
Luo Yangyu, Wang Dangxiao, Zhang Yuru
2004, 30(06): 539-542.
Abstract:
To improve the performance of a force interaction system, it is necessary to understand the effect of respective parameter on the system through modeling and analysis. Considering a 1\|DOF force interaction system, the human operator in the system was modeled as a combination of passive impedance an...
Experiment study of pilots' situation cognitive level
Liu Wei, Yuan Xiugan, Ge Heng, Han Y
2004, 30(06): 543-546.
Abstract:
The aim of this work is to study the problem of situation cognitive (SC) which is an active direction in aviation ergonomics field. Based on previous research results, the experimental and questionnaire systems for evaluating pilots' situation cognitive were built up. After theoretical consideration...
Study on DFR method under corrosive environment for fatigue analysis
Zhang Jianyu, Bao Rui, Chen Bo, Fei Binjun
2004, 30(06): 547-550.
Abstract:
Via transfer the influence of corrosive environment on fatigue life to that on detail fatigue rating equivalently, the DFR method under corrosive environment for fatigue analysis was established. The relation between the ratio of fatigue life under corrosive and normal environment and the corrosive ...
Experimental investigation on effects of blade negative bowing in turbine stator cascades
Chen Haisheng, Tan Chunqing, Kang Shun, Liang Xizhi
2004, 30(06): 551-556.
Abstract:
The outlet flowfield and static pressure on blade surfaces of the classical turbine stator cascades with straight and -10°、-20° bowed blades were measured in the linear cascade wind tunnel. Effects of blade negative bowing on secondary flow, total pressure loss and outlet flow angle were analyzed qu...
Design and implementation of development environment for RTEMS
Bao Zheng, Li Hongbing, Jin Huihua
2004, 30(06): 557-560.
Abstract:
In the development of embedded application, the embedded operating system becomes more important. Its development environment is also an essential part. RTEMS is an open embedded operating system. The design of development environment for RTEMS was implemented. The methods include: connecting the ho...
Improved BP neural network in design of aircraft antiskid braking system
He Heng, Wu Ruixiang
2004, 30(06): 561-564.
Abstract:
The construction of Sp (perfect slip ratio) identifier with back-propagation neural network was proposed to prevent skidding and have the best braking effect in the aircraft braking process. In order to improve the learning ability of the network, a type of self-adaptive learning rate method, second...
Reliability allocation and optimization for complex systems
Lu Xiangbin, Li Xiaogang, Lin Feng
2004, 30(06): 565-568.
Abstract:
A new method of distribution and optimization of reliability of complex systems was presented. The problem of distribution and optimization of reliability complex systems which were constructed on component level was reduced to the problem of nonlinear programming by building practical cost-reliabil...
Analysis for optical extend in light-pipe illumination system
Lü Yong, Zheng Zhenrong
2004, 30(06): 569-571.
Abstract:
Based on optical extend, non-imaging optics was used to optimize the light-pipe lighting system. The transfer of optical extend in light-pipe was analyzed. The detailed analysis and experiment show that a balance between the section size of the light-pipe and the F number of the light beam should be...
Study on stability of air-to-air missile in firing-back attack
Zhang Huaming, Jiang Yuxian
2004, 30(06): 572-576.
Abstract:
A method to solve the instability of an air-to-air missile’s attitude angle motion during its velocity pass through zero in case of that the missile fires back was proposed. The idea of the method is to increase the thrust of the missile’s booster. It results in that the velocity of the missile tran...
Staggered finite volume method for turbomachinery viscous flow field numerical investigation
Li Minjiang, Gui Xingmin
2004, 30(06): 577-582.
Abstract:
A compact staggered mesh limited control volume scheme was used in a three dimensional steady computational fluid dynamics (CFD) code to solve the favre-averaged Navier-Stokes equations and k-ε turbulence model equations more tightly, after Fourier analysis for odd-even decoupled mode in several sta...