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Prognostics and System Health Management Conference (PHM)

作者： Liang Cao Guo Zheng Yong Shen Aviation Key Laboratory of Science and Technology on Fault Diagnosis and Health Management Shanghai Aero Measurement & Control Technology Research Institute Shanghai China

ISBN: (纸本)9781509027798

In the future war, military ammunition container can effectively protect the future high-tech war to combat the high consumption of demands. However, there are still many problems about military ammunition container, wherein the security problems have restricted the bottleneck in the development of our military ammunition container. In order to effectively solve the problem of the safety of military ammunition container transportation process, this paper puts forward the idea of using the Internet of things (IoT) technology to design a monitoring system of military ammunition container. This paper analyzes the problems existing in the military ammunition transport at present stage, system-related technology, and designs the network architecture and system architecture of military ammunition container monitoring system. Lastly, the paper analyzes the system's working process, fault monitoring, and early warning mechanism.

关键词： system design IoT ammunition containers transportation safety

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The method for identifying the health state of aircraft hydraulic pump based on grey prediction

The method for identifying the health state of aircraft hydr...

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Prognostics and System Health Management Conference (PHM)

作者： Zeli Lin Guo Zheng Jinglin Wang Yong Shen Bo Chu Aviation Key Laboratory of Science and Technology on Fault Diagnosis and Health Management Shanghai Shanghai Aero Measurement & Control Technology Research Institute Shanghai

ISBN: (纸本)9781509027798

According to the actual operation situation of aircraft hydraulic system, the paper puts forward a state recognition methods of aircraft hydraulic system based on Grey Theory. This method can do prediction and recognition to the current operation status of aircraft hydraulic system and a moment of running state, and gets the prediction results of aircraft hydraulic system health, and provides reference for safe operation of the aircraft for the actual aircraft flight. The paper uses the hydraulic pump of the aircraft hydraulic system as the key components concrete object of study. And the paper uses prediction method for the hydraulic pump running state prediction. The paper gets the prediction results. And the paper gives the error comparison through paralleling the actual results with prediction results, and the result show that the method can get good prediction effect.

关键词： Aircraft Predictive models Aerospace control Information entropy Forecasting Atmospheric modeling Entropy

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Compound model of residual stiffness degradation for FRP composites

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Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica 2016年第2期33卷 280-286页

作者： Zong, Junda Yao, Weixing Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing University of Aeronautics and Astronautics Nanjing210016 China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing210016 China

In order to establish the relationship between residual stiffness, material damage quantity and residual life, failure modes of fiber-reinforced polymer (FRP) laminates under tension-tension fatigue load effect are divided into three types: inter fiber fracture, fiber random fracture and delamination. Based on the analysis of quantitative relationship between different failure modes and residual stiffness degradation quantity, a compound model of residual stiffness degradation, integrated each failure mode's influence, was put forward. This model is applicable to stage I and II, which occupy most of the life, avoids the influence of stiffness reduction uncertainty in stage III. Normalization of residual stiffness degradation curve by time scale, eliminates individual specimens' dispersion effect, significantly reduces the dispersion. Statistical analysis was conducted for fatigue test results of four kinds of E-glass/Epoxy glass fiber composite laminates and three kinds of AS-4/polyether-ether-ketone (PEEK) carbon fiber composite laminates, which shows that the proposed model is suitable for an accurate description of the residual stiffness decline law of composites. © 2016, BUAA Culture Media Group Ltd. All right reserved.

关键词： Failure modes

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Particle Filter Based on Improved Genetic Algorithm Resampling

Particle Filter Based on Improved Genetic Algorithm Resampli...

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2016 IEEE Chinese Guidance, Navigation and control Conference (IEEE CGNCC2016)

作者： W.Wang Q.K.Tan J.Chen Z.Ren Flight Standards Department Civil Aviation Management Institute of China Science and Technology on Aircraft Control Laboratory Beihang University College of Engineering China Agricultural University

ISBN: (纸本)9781467383196

For solving the problem of sample impoverishment in particle filter resampling,this paper proposes a particle filter based on improved genetic algorithm resampling combined with characteristics of selection operator,crossover operator and mutation operator in the genetic *** the improved genetic algorithm,we choose the importance weight of particles as the fitness value,select particles by utilizing simple resampling and elitist selection,and conduct crossover and mutation operation according to the changeable crossover probability and changeable mutation probability based on the degree of particle *** results demonstrate that the particle filter algorithm based on the improved genetic algorithm resampling could guarantee the validity of the particles and increase the diversity of the *** algorithm could improve the performance of the particle filter.

关键词： filter Particle Filter Based on Improved Genetic Algorithm Resampling Filter

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Fast Tracking and Accurate Pose Estimation of Space Flying Target Based on Monocular Vision

Fast Tracking and Accurate Pose Estimation of Space Flying T...

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2016 IEEE Chinese Guidance, Navigation and control Conference (IEEE CGNCC2016)

作者： Chuankai Liu Xiaoxue Wang Jia Wang Jianhua Su Baofeng Wang Geshi Tang Xiangyan Guo Key Laboratory of Science and Technology on Aerospace Flight Dynamics Beijing Aerospace Control Center Institute of Automation Chinese Academy of Sciences

ISBN: (纸本)9781467383196

Autonomous rendezvous and robotic capturing of flying targets is widely used in many space shuttle missions and it is very crucial for on-orbit *** perform this task,tracking and pose estimation of the flying targets is usually considered as one of the most important issues,needing to be addressed among the whole *** account of the specificity of space environment such as lighting and the continuity of the rendezvous process,in this paper,we design a fast tracking and accurate pose estimation algorithm for cooperative luminaries(or retro-reflectors),to guide a safe and reliable capturing *** from available target tracking or searching method,this paper defines a new comparability measure function for target appearance and utilizes the continuity of target moving to limit the target search in a predicted range of the image,which accelerates the search ***,the projective shape changes of each luminary due to rotation are also considered to help improve the accuracy of the target *** the positions of multiple target spots obtained from the image,least square method is applied to adjust the spatial pose results iteratively,and finally accurate pose estimation is *** on the simulated space target,which consists of six LEDs,validate the proposed method.

关键词： image frame Fast Tracking and Accurate Pose Estimation of Space Flying Target Based on Monocular Vision Target

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Introducing Projective Transformations into Lunar Image Correspondence for Positioning Large Distance Rover

Introducing Projective Transformations into Lunar Image Corr...

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World Congress on Intelligent control and Automation

作者： Chuankai Liu Baofeng Wang Xu Yang Ping Miao Geshi Tang Kun Dai Jia Wang Xiaoxue Wang Xiangyan Guo Key Laboratory of Science and Technology on Aerospace Flight Dynamics Beijing Aerospace Control Center Institute of Automation Chinese Academy of Sciences

ISBN: (纸本)9781467384155

Positioning rovers with a large distance is an important mission of the ground tele-operation center, which can decrease or eliminate the position errors accumulated in continuous measurement and multiple calculations, and facilitate the rover to arrive at faraway scientific probing targets. Currently, the most representative high-accuracy positioning methods are implemented with multi-camera photogrammetric model, which takes the homonymous point pairs extracted from images as constraint points of camera bundles to establish observation equations. The amount, spatial distribution and matching accuracy of homonymous point pairs will affect the effectiveness and accuracy of rover positioning. However, in the case of long-range moving, the images acquired by rover in two positions with a fairly big distance are difficult to match due to existence of large scale and rotation transformations, reflected view of the same scenery and different illumination conditions between acquired images, and a lot of outliers will be generated. In this paper, we introduce projective transformations, which are approximately calculated with imaging relations of two positions, to tackle the outlier elimination problem, and design an iterative algorithm to reduce the outliers and refine the positioning results simultaneously. With this method, the initial approximate positioning information of the rover can be utilized to constrain the range of each feature point projected to another image, and outliers are reduced gradually, preserving almost all the inliers. Finally, several experiments are conducted with lunar surface images acquired by Chang'E-3 rover, which witness the validity of the proposed method.

关键词： outliers Point pairs images roving vehicles Patient Positioning Feature Points location error Imagery (Psychotherapy) continuous measurement Iterative algorithms

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Markov decision evolutionary game theoretic learning for cooperative sensing of unmanned aerial vehicles

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science China(Technological sciences) 2015年第8期58卷 1392-1400页

作者： SUN ChangHao DUAN HaiBin State Key Laboratory of Virtual Reality Technology and Systems School of Automation Science and Electronic EngineeringBeihang University Bio-inspired Autonomous Flight Systems (BAFS) Research Group Science and Technology on Aircraft Control LaboratorySchool of Automation Science and Electronic EngineeringBeihang University

As one of the major contributions of biology to competitive decision making, evolutionary game theory provides a useful tool for studying the evolution of cooperation. To achieve the optimal solution for unmanned aerial vehicles （UAVs） that are car- rying out a sensing task, this paper presents a Markov decision evolutionary game （MDEG） based learning algorithm. Each in- dividual in the algorithm follows a Markov decision strategy to maximize its payoff against the well known Tit-for-Tat strate- gy. Simulation results demonstrate that the MDEG theory based approach effectively improves the collective payoff of the roam. The proposed algorithm can not only obtain the best action sequence but also a sub-optimal Markov policy that is inde- pendent of the game duration. Furthermore, the paper also studies the emergence of cooperation in the evolution of self-regarded UAVs. The results show that it is the adaptive ability of the MDEG based approach as well as the perfect balance between revenge and forgiveness of the Tit-for-Tat strategy that the emergence of cooperation should be attributed to.

关键词： unmanned aerial vehicles （UAVs） iterated prisoner＇s dilemma （IPD） Markov decision evolutionary game （MDEG） replicator dynamics cooperation

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Robust monocular visual odometry using optical flows for mobile robots

Robust monocular visual odometry using optical flows for mob...

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Chinese control Conference (CCC)

作者： Haifeng Li Zunhe Hu Xinwei Chen College of Computer Science and Technology Civil Aviation University of China Tianjin Fujian Provincial Key Laboratory of Information Processing and Intelligent Control Fuzhou Department of Computer Science Minjiang University Fuzhou

A robust optical flow-based visual odometry method using a single onboard camera is proposed in this paper. To improve the quality of the noisy optical flows, a correction method across multiple frames is developed. Furthermore, the optical flows in the plane at infinity are detected and removed as these optical flows have very low signal to noise ratio for robot translation estimation. Finally, a RANSAC approach for robot ego-motion estimation is proposed. Physical experiments are carried out and the results show that the proposed method is able to estimate the camera trajectory robustly with reasonable accuracy.

关键词： Adaptive optics Image motion analysis Computer vision Optical imaging Optical sensors Cameras Optical noise

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Adaptive Sliding Mode control for Re-entry Attitude of Near Space Hypersonic Vehicle Based on Backstepping Design

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IEEE/CAA Journal of Automatica Sinica 2015年第1期2卷 94-101页

作者： Jingmei Zhang Changyin Sun Ruimin Zhang Chengshan Qian the Flight Control Research Center Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education School of Automation Southeast University the College of Information and Control Nanjing University of Information Science & Technology

Combining sliding mode control method with radial basis function neural network (RBFNN), this paper proposes a robust adaptive control scheme based on backstepping design for re-entry attitude tracking control of near space hypersonic vehicle (NSHV) in the presence of parameter variations and external disturbances. In the attitude angle loop, a robust adaptive virtual control law is designed by using the adaptive method to estimate the unknown upper bound of the compound uncertainties. In the angular velocity loop, an adaptive sliding mode control law is designed to suppress the effect of parameter variations and external disturbances. The main benefit of the sliding mode control is robustness to parameter variations and external disturbances. To further improve the control performance, RBFNNs are introduced to approximate the compound uncertainties in the attitude angle loop and angular velocity loop, respectively. Based on Lyapunov stability theory, the tracking errors are shown to be asymptotically stable. Simulation results show that the proposed control system attains a satisfied control performance and is robust against parameter variations and external disturbances. © 2014 Chinese Association of Automation.

关键词： Airships Angular velocity Attitude control Backstepping control theory Design Functions Hypersonic aerodynamics Hypersonic vehicles Navigation Radial basis function networks Sliding mode control Uncertainty analysis Vehicles

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Investigation into Influence Factors of synchronous movement of Multi-cylinders

Investigation into Influence Factors of synchronous movement...

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2016 IEEE/CSAA International Conference on Aircraft Utility Systems(AUS)

作者： Chao Hu Pengfei Zhang Xiaoping Ouyang Houtao Ku Qinghe Zhou Enxiao Zhang State Key Lab.of Fluid Power Transmission and Control Zhejiang University Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration State Key Lab.of Fluid Power Transmission and Control Zhejiang Univ. The High School Attached to Zhejiang University

Seal is one of the most important characteristics for cylinders and suitable seal configuration will guarantee the long life cycle of the seal and the *** is the only way which can demonstrate the best seal configuration in *** this paper,one approach is brought forward for testing the seal performance of cylinders with different seals configurations at the same load working condition for saving the test *** the test-rig,the synchronization of cylinders is one of the key *** test system is modelled in the AMESim *** effect caused by the changes of the different physical parameters is analyzed,such as load stiffness,viscous damping coefficient of cylinder,dead volume of cylinder and internal leakage *** experiment is carried out and test results agree with the simulation ***,the appropriate solution is proposed for improving the synchronization of the multi-cylinders further.

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