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3rd IEEE International Conference on Information technology, Big Data and Artificial Intelligence, ICIBA 2023

作者： Huang, Hong Jia, Qingzhong Tao, Ximing Beijing Institute of Technology Key Laboratory of Dynamic and Control of Flight Vehicle Beijing China Aviation Transport Equipment Provincial Technology Innovation Center Shanxi China

ISBN: (纸本)9781665490788

Aiming at the problems of slow 'ghost image' elimination speed, ship trail interference, and complicated sea surface noise in the process of ViBe algorithm's ship target detection in the sea background. This paper proposes a ViBeDiff3C object detection algorithm which combines the frame difference method and the improved ViBe algorithm. Based on the frame-to-frame difference method, the ViBe algorithm is improved to detect ship targets, and the 'ghost' problem caused by the ViBe algorithm caused by moving targets in the first frame of the image is solved, thereby improving the update speed of the background template and achieving the goal of quickly eliminating 'ghosts'. Objective To improve the detection effect of the frame difference method by introducing the Canny operator into the frame difference method, and solve the problems of sea surface noise, ship wakes and holes, thereby improving the clarity and accuracy of the target. © 2023 IEEE.

关键词： Object recognition

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Inter-UAV State Estimation of Swarmed UAVs with Communication Constraints

Inter-UAV State Estimation of Swarmed UAVs with Communicatio...

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International Conference on Guidance, Navigation and control, ICGNC 2024

作者： Hao, Li Song, Dongliang Yang, Yukun Zuo, Ling Li, Zhiyu Ma, Shichao Wen, Jiayun Hou, Lin Tang, Qiang Aviation Industries Corporation of China (AVIC) Xi’an Flight Automatic Control Research Institute (FACRI) Xi’an 710076 China National Key Laboratory of Science and Technology on Aircraft Control Xi’an 710076 China

ISBN: (纸本)9789819622351

This paper focuses on the inter-UAV state estimation method of swarmed UAVs with communication constraints, which mainly analyzes the incomplete state information and data missing between UAVs. Firstly, the motion state estimation method of UAVs based on extended Kalman filter (EKF) is established for the incomplete state information of UAVs with communication constraints. Secondly, aiming at the data missing between UAVs with limited communication, the state prediction method of UAVs is studied. Finally, the validity of the proposed method was verified by digital simulation experiments and real flight experiments. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Communication Constraints State Estimation Swarmed UAVs

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Effectiveness Verification of Bearing Health Assessment Method Based on SAE-MD 6th

Effectiveness Verification of Bearing Health Assessment Meth...

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6th China Aeronautical science and technology Conference, CASTC 2023

作者： Jie, Zhenguo Shen, Yong Chen, Lijing Guo, Peipei Xu, Zhi Aviation Key Laboratory of Science and Technology on Fault Diagnosis and Health Management Shanghai China AVIC Shanghai Aero Measurement and Control Technology Research Institute Shanghai China

ISBN: (纸本)9789819988631

To verify the effectiveness of the health assessment model, experimental validation research on helicopter dynamic component was conducted. Firstly, the health representation of bearing signals was self-learning by stacked auto-encoder, and the health representation was input to Mahalanobis distance for health assessment. Then, the comprehensive design of test and verification profile for evaluating the degradation capability of bearing performance was carried out. Finally, the bearing degradation test and signal acquisition was carried out, and the collected vibration signals was analyzed and processed using the stacked auto encoder and Mahalanobis distance method, which verified the effectiveness of the health assessment methods proposed in this paper. © 2024, Chinese Society of Aeronautics and Astronautics.

关键词： Signal encoding

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Research on power control algorithm of wireless sensor based on Nash bargaining solution

Research on power control algorithm of wireless sensor based...

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2022 International Conference on Algorithms, Microchips and Network Applications

作者： Yue, Jian Zhu, Pan Yu, Dongzhe Chinese Flight Test Establishment Aviation Key Laboratory of Science and Technology on Flight Test Xian710089 China

ISBN: (纸本)9781510653290

For the wireless sensor network of airborne test system in flight test, in order to obtain better communication performance and improve the signal interference to noise ratio, the sensor nodes in the network will increase the transmission power, which will lead to the aggravation of the interference between the nodes, and bring negative impact to the wireless sensor network, finally cause the decline of overall network performance, and energy waste of sensor nodes. In order to solve this problem, this paper introduces the balance factor and designs the utility function considering a distance factor based on the Nash bargaining solution cooperative game theory. At the same time, a new power control algorithm is derived. The simulation results show that the proposed algorithm is simple to convergence, which could effectively improve the power consumption and the overall performance of wireless sensor network system, in addition, prolong the service life of sensor and achieve higher network utility. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Power control

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Fluid-structure interaction simulation for multi-body flexible morphing structures

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Chinese Journal of Aeronautics 2024年第2期37卷 137-147页

作者： Wenzhi GUO Yongtao SHUI Lu NIE Gang CHEN State Key Laboratory of Strength and Vibration for Mechanic Structures School of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China China Academy of Launch Vehicle Technology Beijing 100076China China Academy of Aerospace Science and Innovation Beijing 100086China Shannxi Key Laboratory of Service Environment and Control for Flight Vehicles Xi’an Jiaotong UniversityXi’an 710049China

The multi-body flexible morphing airfoil can improve the aerodynamic characteristics based on different flight missions *** researches have focused on the unsteady aerodynamic characteristics of flexible wings under passive ***,the unsteady aerodynamic characteristics with the fluid-structure interaction effects in the multi-body active actuation process of morphing airfoil deserve further *** this paper,a fluid-structure coupled simulation method for multi-body flexible morphing airfoil with active actuation subsystem was investigated,and the aerodynamic characteristics during deformation were compared with different skin flexibility,flow field environment,actuation mode and actuation *** numerical results show that for the steady aerodynamic,the skin flexibility can improve the stability *** the unsteady process,the change trend of the transient lift coefficient and pitching moment are consistent with those of the active drive characteristics,while the instantaneous lift-drag ratio coefficient is greatly affected by the driving mode and can be improved by increasing the driving duration.

关键词： Fluid-structure interaction Multi-body dynamics modeling Flexible structures Aerodynamics Morphing wings

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An Optimization Method for the Swing of a Quadrotor flight Suspension System 25

An Optimization Method for the Swing of a Quadrotor Flight S...

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25th IEEE China Conference on System Simulation technology and its Application, CCSSTA 2024

作者： Yang, Sen Zang, Xinlian Tong, Jigang Xie, Tian Jin, Xin Tianjin University of Technology The School of Electrical Engineering and Automation Tianjin China AVIC Xi'an Flight Automatic Control Research Institute National key laboratory of science and technology on aircraft control Xi'an China

ISBN: (纸本)9798350366600

The aim of this study is to explore optimization control methods for suspension systems during the flight of quadcopters. The traditional control method of suspension system has some problems such as oscillation and instability, so an optimization scheme based on Gaussian pseudo-general algorithm is proposed in this paper. Through numerical simulation and actual flight test, the effectiveness of the optimization algorithm in improving system stability and reducing oscillation amplitude is verified. At the same time, this study conducted a comparative analysis of the suspension system of the quadrotor vehicle and the free fall body, and the optimization algorithm is found to be feasible and can well improve the control accuracy and stability of the system, and provide strong support for the safety of the quadrotor vehicle in various application scenarios. © 2024 IEEE.

关键词： flight testing

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Reliability analysis of arresting hook engaging arresting cable for carrier-based aircraft influenced by multifactors

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Chinese Journal of Aeronautics 2023年第1期36卷 311-323页

作者： Yiming PENG Yin YIN Pengpeng XIE Xiaohui WEI Hong NIE State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle Nanjing University of Aeronautics and AstronauticsNanjing 210016China Shanghai Institute of Spacecraft Equipment Shanghai 200240China

The carrier-based aircraft landing and arrest process is complex and nonlinear,and includes the coupling effect between the aircraft and arresting *** has many uncertain factors,which lead to difficulty in the reliability *** make the reliability analysis more accurate and effective,this paper presents some *** a certain type of carrier-based aircraft as the research object,a dynamic model of the landing and arrest cable was established,and the accuracy of the model was verified using laboratory test *** on the model,this paper shows how the key parameters,including the sinking velocity,pitch angle and horizontal velocity,affect the collision rebound performance of the arresting *** that,a limit state equation of the arresting hook system’s reliability was *** the implicit limit state equation,a surrogate model of the reliability of the arresting hook was established using the Support Vector Machine(SVM)method,and then reliability analysis was carried out using the Monte Carlo ***,it was explained in detail how the key parameters affect the reliability of the hook engaging the arresting cable,and some meaningful conclusions were *** analysis method and its results can provide a reference for the top-level parameter design of carrier-based aircraft and reliability research on the arresting systems.

关键词： Arresting cable Arresting devices Dynamics Reliability Support Vector Machines

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A Enhanced Feature Extraction for 3D Object Detection 25

A Enhanced Feature Extraction for 3D Object Detection

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25th IEEE China Conference on System Simulation technology and its Application, CCSSTA 2024

作者： Meng, Qingao Tong, Jigang Yang, Sen Xie, Tian Jin, Xin Tianjin University of Technology The School of Electrical Engineering and Automation Tianjin China Avic Xi'an Flight Automatic Control Research Institute National Key Laboratory of Science and Technology on Aircraft Control Xi'an China

ISBN: (纸本)9798350366600

3D object detection is crucial for autopilot and augmented reality applications. However, accurate feature extraction is the key to achieve high-precision detection, but traditional methods face the challenges of information loss and computational inefficiency. To address this, we propose an enhanced feature extraction method. We first divide the 3D space into voxel grids of varying scales. Then, using 3D sparse convolution, we extract features which are compressed along the Z axis to form BEV (Bird's Eye View) feature images. An efficient multi-scale attention mechanism is then employed to enhance these BEV features. The refined feature map is subsequently located and classified through a CT-stacking module and RPN (Region Proposal Network). Voxel features from the proposal and 3D backbone are passed through a voxel RoI pool to directly extract RoI features from the 3D features for further refinement. Finally, a cascaded attention network refines the proposal and strengthens confidence prediction. Experiments on test set validate our method effectiveness, showing improved accuracy over traditional voxel methods. Overall, this enhanced feature extraction technique offers a promising solution for 3D target detection, particularly in scenarios demanding high real-time performance and precision. © 2024 IEEE.

关键词： Feature extraction

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An Adaptive Method for Dynamic Background Compensation Based on SIFT 7

An Adaptive Method for Dynamic Background Compensation Based...

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7th IEEE Information technology and Mechatronics Engineering Conference, ITOEC 2023

作者： Tao, Ximing Jia, Qingzhong Du, Tingting Huang, Hong Beijing Institute of Technology Key Laboratory of Dynamic and Control of Flight Vehicle Ministry of Education Beijing China Aviation Transport Equipment Provincial Technology Innovation Center Beijing China

ISBN: (纸本)9798350334197

To address the issue of poor object detection and tracking performance in dynamic scenes, a low-complexity adaptive dynamic background compensation algorithm is proposed to improve the real-time and accuracy of object detection and tracking. The algorithm uses the SIFT feature point matching algorithm to assist in calculating the background motion parameters and introduces an adaptive coefficient with feedback mechanism to reduce the matching calculation range of background motion parameters, thereby achieving dynamic background compensation. While improving the accuracy of background compensation, the algorithm also speeds up the computation to some extent. Experimental results show that this algorithm can improve the accuracy of detecting and tracking moving objects in video sequences with complex dynamic backgrounds while occupying only a small amount of system resources. © 2023 IEEE.

关键词： Object detection

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A Joint Framework for Knowledge Extraction from flight Training Comments 17th

A Joint Framework for Knowledge Extraction from Flight Tra...

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17th CCF Conference on Computer Supported Cooperative Work and Social Computing, ChineseCSCW 2022

作者： Zhang, Yuxuan Shang, Jiaxing Zheng, Linjiang Wu, Quanwang Cao, Weiwei Sun, Hong College of Computer Science Chongqing University Chongqing China Key Laboratory of Dependable Service Computing in Cyber Physical Society Ministry of Education Chongqing University Chongqing China Key Laboratory of Flight Techniques and Flight Safety Civil Aviation Flight University of China Guanghan China Flight Technology and Flight Safety Research Base Civil Aviation Flight University of China Guanghan China

ISBN: (纸本)9789819923557

The flight training comments are textual evaluation from the instructor to the flight training students. Extracting the assessment experience and knowledge from the flight training comments can help improve the flight training level. To this end, a joint extraction framework is proposed in this paper. For the model input, we use an end-to-end grid tagging scheme as the decoding algorithm to extract aspect terms, opinion terms and opinion pairs simultaneously. Considering the continuity of terms, we propose WoBERT as encoder, which modifies the pre-trained word segmentation based on BERT, and realizes Chinese word segmentation at word-level granularity. We conduct extensive experiments on a real flight training comments dataset. The results show that the model with WoBERT as the encoder achieves the best performance with a F1-score of 0.647, which can be used for the task of knowledge extraction from the flight training comments. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Extraction

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