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3rd International Conference on Electronic Information Engineering and Computer science, EIECS 2023

作者： Yue, Jian Zhu, Pan Yan, Lijun Aviation Key Laboratory of Science and Technology on Flight Test Chinese Flight Test Establishment Xi'an710089 China

ISBN: (纸本)9798350316674

The main way to measure the aerodynamic characteristics of aircraft is to carry out ground test. However, due to the great difference between the static aerodynamic data of actual flight and ground test, such as the ever-changing flight meteorological conditions and environment, the test data of flight test show multiple distribution, so it is difficult to analyze aerodynamic characteristics of aircraft. In this paper, a large number of flight data are analyzed by using cluster analysis and MATLAB software. In order to consider the variation of multi variables, the hierarchical clustering analysis of flight test data was used. The results show that the data with great changes in the measurement process can be classified properly, and the effective and reliable data are extracted, and the practicability of clustering analysis in data extraction is proved. © 2023 IEEE.

关键词： cluster analysis data extraction flight test

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YOLOv8-EMSC:A lightweight fire recognition algorithm for large spaces

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Journal of Safety science and Resilience 2024年第4期5卷 422-431页

作者： Deng Li Tan Yang Zhou Jin Wu Si-qi Liu Quan-yi College of Civil Aviation Safety Engineering Civil Aviation Flight University of ChinaGuanghan618307China Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province Guanghan 618307China Sichuan Key Technology Engineering Research Center for All-electric Navigable Aircraft Guanghan618307China

Stringent fire prevention requirements are imperative in expansive environments. Fire detection in diverse large-scale settings typically relies on sensor-based or AI-driven target detection methods. Traditional fire detectors often suffer from false alarms and missed detections, failing to meet the fire safety requirements of large-scale structures. Many existing target detection algorithms are characterized by substantial model sizes. Some detection terminals in large structures face challenges deploying these models due to constrained computational resources. To address this issue, we propose a lightweight model, YOLOv8-EMSC, derived from YOLOv8n. The incorporation of C2f_EMSC, replacing the C2f module, significantly reduces the model parameters in the enhanced YOLOv8-EMSC model compared to YOLOv8n, thereby enhancing model inference speed. Extensive testing and validation using a custom-built large-scale infrared fire dataset demonstrates a 9.6 % reduction in parameters compared to the baseline model for YOLOv8-EMSC, achieving an average precision of 95.6 %, surpassing both the baseline and mainstream models and significantly enhancing fire detection accuracy in expansive environments.

关键词： Fire detection Large space Lightweight YOLOv8 YOLOv8-EMSC

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Structural non-reciprocity study of optical systems for RFOGs driven by broad-spectrum light sources

Structural non-reciprocity study of optical systems for RFOG...

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2024 International Conference on Optoelectronic Information and Optical Engineering, OIOE 2024

作者： Su, Zhengcheng Yan, Bo Li, Jun Lan, Shiqi National Key Laboratory of Science and Technology on Aircraft Control Flight Automatic Control Research Institute Shaanxi Xi’an710076 China

ISBN: (数字)9781510680470

ISBN: (纸本)9781510680463

Aiming at the structural asymmetry problem caused by the inconsistency of the two optical fibers connecting the Y waveguide and the resonant cavity in the RFOG optical system driven by a broad-spectrum light source, a study on the non-reciprocity of the optical structure of the RFOG driven by a broad-spectrum light source was carried out. A model of the optical system structure non-reciprocity is established, and the effect of the optical system structure non-reciprocity on the gyroscope system in a variable temperature environment is analyzed. The results show that the optical system structure non-reciprocity causes the gyro sweep mode curve to change, but does not affect the system accuracy when there is no temperature change, and the temperature characteristics of the optical system structure non-reciprocity lead to pseudo-rotational speed output of the gyro output in a variable temperature environment, which is strongly correlated with the length difference and the rate of change of temperature. © 2024 SPIE.

关键词： Light sources

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Refined modeling and experimental verification of a torque motor for an electro-hydraulic servo valve

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Chinese Journal of Aeronautics 2023年第6期36卷 302-317页

作者： Zhichuang CHEN Shenghong GE Yulei JIANG Wenhao CHENG Yuchuan ZHU National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft SystemsNanjing 210061China AVIC Nanjing Servo Control System Co. LtdNanjing 210032China

The Permanent Magnet Torque Motor(PMTM)is the key electro-mechanical conversion device in an Electro-Hydraulic Servo Valve(EHSV).In this work,a refined model of a PMTM is developed,considering the non-working air-gaps between the upper or lower yoke and the armature,the fringing effect at the limiting holes,and the nonlinear permeability of soft magnetic *** on the refined model,the influences of various factors on the calculation accuracy of the magnetic flux at the pole surfaces of the armature and the output torque are *** verifying the validity of the refined model,a Finite Element Analysis(FEA)of the PMTM is conducted,and a test platform is *** with existing models,the refined model can better reveal the intrinsic mechanism of the PMTM,and its calculations are more consistent with the FEA *** experimental results of the armature deflection displacement show that the refined model can accurately describe the output characteristics of the PMTM.

关键词： Calculation accuracy Electro-hydraulic servo valve Experimental verification Finite element analysis Refined model Torque motor

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A Multi-UCAV cooperative occupation method based on weapon engagement zones for beyond-visual-range air combat

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Defence technology（防务技术） 2022年第6期18卷 1006-1022页

作者： Wei-hua Li Jing-ping Shi Yun-yan Wu Yue-ping Wang Yong-xi Lyu School of Automation Northwestern Polytechnical UniversityXi'an710129China Shaanxi Province Key Laboratory of Flight Control and Simulation Technology Xi'an710129China Science and Technology on Aircraft Control Laboratory FACRIXi'an710065China

Recent advances in on-board radar and missile capabilities,combined with individual payload limitations,have led to increased interest in the use of unmanned combat aerial vehicles(UCAVs)for cooperative occupation during beyond-visual-range(BVR)air ***,prior research on occupational decision-making in BVR air combat has mostly been limited to one-on-one *** such,this study presents a practical cooperative occupation decision-making methodology for use with multiple *** weapon engagement zone(WEZ)and combat geometry were first used to develop an advantage function for situational assessment of one-on-one *** encircling advantage function was then designed to represent the cooperation of UCAVs,thereby establishing a cooperative occupation *** corresponding objective function was derived from the one-on-one engagement advantage function and the encircling advantage *** resulting model exhibited similarities to a mixed-integer nonlinear programming(MINLP)*** such,an improved discrete particle swarm optimization(DPSO)algorithm was used to identify a *** occupation process was then converted into a formation switching task as part of the cooperative occupation model.A series of simulations were conducted to verify occupational solutions in varying situations,including two-on-two *** results showed these solutions varied with initial conditions and weighting *** occupation process,based on formation switching,effectively demonstrates the viability of the proposed *** cooperative occupation results could provide a theoretical framework for subsequent research in cooperative BVR air combat.

关键词： Unmanned combat aerial vehicle Cooperative occupation Beyond-visual-range air combat Weapon engagement zone Discrete particle swarm optimization Formation switching

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Building of lightweight Nb_(2)CT_(x) MXene@Co nitrogen-doped carbon nanosheet arrays@carbon fiber aerogels for high-efficiency electromagnetic wave absorption in X and Ku bands inspired by sea cucumber

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Nano Research 2024年第11期17卷 9261-9274页

作者： Jiatong Yan Ce Cui Wenhao Bai Hong Tang Ronghui Guo College of Biomass Science and Engineering Sichuan University Chengdu 610065 China Yibin Industrial Technology Research Institute Sichuan University Yibin 644005 China High-Tech Organic Fibers Key Laboratory of Sichuan Province Chengdu 610041 China Aviation Key Laboratory of Science and Technology on Structural Corrosion Prevention and Control China Special Vehicle Research Institute Jingmen 448035 China Graduate School of Energy Science Kyoto University Kyoto City 606-8501 Japan

The problems of electromagnetic wave(EMW)pollution in X and Ku bands(8–18 GHz)are becoming more and more ***,it is urgent to design EMW absorbing materials with high-efficiency such as thin thickness,lightweight,wide bandwidth and strong EMW *** by the biomorph of sea cucumber,Nb_(2)CT_(x) MXene@Co nitrogen-doped carbon nanosheet arrays@carbon fiber aerogels(Nb_(2)CT_(x)@Co-NC@CFA,Nb_(2)CT_(x)=niobium carbide)were constructed by self-assembly,in-situ chemical deposition and subsequent *** carbon fiber aerogel,as the basic skeleton of sea cucumber,forms lightweight three-dimensional interconnected conductive network,enhances the dielectric loss and extends the multiple reflection and absorption paths of *** the tentacles of sea cucumber surface,Nb_(2)CT_(x) MXene and Co nitrogen-doped carbon nanosheet arrays exist rich heterogeneous interfaces,which play an important role in improving EMW polarization loss and optimizing impedance *** minimum reflection loss(RLmin)of Nb_(2)CT_(x)@Co-NC@CFA reaches−54.7 dB at 9.84 GHz(2.36 mm)with a low filling ratio of 10 wt.%and the effective absorption bandwidth(EAB)of Nb_(2)CT_(x)@Co-NC@CFA reaches 2.96 GHz(8.48–11.44 GHz)with 2.36 mm and 5.2 GHz(12.8–18 GHz)with 1.6 mm,covering most of X and Ku bands by adjusting *** radar cross section(RCS)value of Nb_(2)CT_(x)@Co-NC@CFA is 26.64 dB·m^(2),which is lower than that of the perfect electrical conductor(PEC),indicating that Nb_(2)CT_(x)@Co-NC@CFA can effectively decrease the probability of the target being detected by the radar *** work provides ideas for design and development of EMW absorbing materials with high-efficiency EMW absorption in X and Ku bands.

关键词： bionic sea cucumber Nb_(2)CT_(x)MXene Co nitrogen-doped carbon nanosheet arrays carbon fiber aerogel lightweight electromagnetic wave absorption

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Research on Longitudinal control Law Design of Thrust Vector Aircraft Based on Dynamic Inverse

Research on Longitudinal Control Law Design of Thrust Vector...

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International Conference on Guidance, Navigation and control, ICGNC 2022

作者： Liu, Hengyu Zhang, Ning Chen, XiaoLong Ma, YueLong National Key Laboratory of Science and Technology on Integrated Technology Control Flight Automatic Control Research Institute AVIC Xi’an100083 China

ISBN: (纸本)9789811966125

In order to improve the maneuvering control ability at high angle of attack, this paper designs the commonly used thrust vector aircraft model. Based on the model, the longitudinal control law design of aircraft is studied by combining the dynamic inversion method with the incremental dynamic inversion method. This paper uses the dynamic inversion and incremental dynamic inversion method in the inner loop and outer loop of the model design of the new control system. Compared with the traditional dynamic inverse control method, the longitudinal control method proposed in this paper has better control performance and is more stable. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Longitudinal control

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Research on longitudinal control technology in the transition section of tilt-rotor aircraft based on linear active disturbance rejection control 2

Research on longitudinal control technology in the transitio...

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2023 2nd International Conference on Aerospace and control Engineering, ICoACE 2023

作者： Xu, Shaofeng Chang, Shaoping Shi, Pengfei Wang, Lin AVIC Xi'An Flight Automatic Control Research Institute Xi'an710065 China National Key Laboratory of Science and Technology on Aircraft Control Xi'an710065 China

To solve the problem of strong coupling and control redundancy in the transition section of the tilt-rotor, this paper presents a longitudinal control method based on linear active disturbance rejection control (LADRC), verified by simulation. Firstly, the nonlinear dynamics model of tilt-rotor aircraft based on the mechanism method is established, and the model's accuracy is verified by comparing the trim result with the generic tilt-rotor aircraft simulation (GTRS) model verified by flight test in XV-15. Then, the control and redundant rudder surface assignment strategies for tilt-rotor aircraft are proposed. Then, the vertical and vertical control law of tilt-rotor aircraft is designed, the linear expansion state observer (LESO) model is analyzed and derived, and the linear active disturbance rejection controller suitable for attitude loop control of tilt-rotor is designed. The altitude and velocity loops are controlled. Finally, the proposed linear active disturbance rejection control (LADRC) controller is verified by simulation, and the whole process of tilting transition is simulated. The results show that the proposed control strategy and the controller designed in this paper have strong anti-disturbance ability, fast response speed, and high control precision and can be used in the transition section of tilt-rotor aircraft. The vertical direction shall be well controlled. © Published under licence by IOP Publishing Ltd.

关键词： controllers

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Research on Cooperative Path Planning and Formation control for Multiple UAVs 1

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7th Chinese Conference on Swarm Intelligence and Cooperative control, CCSICC 2023

作者： Shichao, Ma Xianglun, Zhang Qiang, Tang Zhiyu, Li Yukun, Yang AVIC Xi’an Flight Automatic Control Research Institute Xi’an710076 China National Key Laboratory of Science and Technology on Aircraft Control Xi’an710076 China

ISBN: (数字)9789819733361

ISBN: (纸本)9789819733354

Considering the background of Multi-UAVs formation cooperation, a Cooperative Multi-Swarm Particle Swarm Optimization (CMS-PSO) scheme as well as a prescribed performance control (PPC) method is introduced. Firstly, the cost function is developed and a novel CMS-PSO approach is applied to deal with three dimensional (3D) path planning problem. Then, the nonlinear mathematical formation model is given. So as to confine the location differences of the formation system, a PPC algorithm integrated with the backstepping methodology is constructed in details. In the end, the results of mathematical simulations show the validity of the introduced path algorithm and control method. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Cost functions

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Design and Optimization of a Samara-Inspired Lightweight Monocopter for Extended Endurance

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IEEE Robotics and Automation Letters 2025年第7期10卷 7214-7221页

作者： Xinyu Cai Shangkun Zhong Tee Meng Tan Wei Jun Ang Shaohui Foong Engineering Product Development Pillar Singapore University of Technology and Design (SUTD) Singapore Aviation Key Laboratory of Science and Technology on Flight Control AVIC Xi'an Automatic Flight Control Research Institute Xi'an China

Small multirotors demonstrate significant potential due to their simple airframe and human-friendly operation. However, the reduced size results in substantially higher energy consumption, which severely limits their flight endurance and restricts their range of applications. Ornithopters, while offering better aerodynamic efficiency, experience energy losses due to the mechanical complexity required to generate reciprocating motion. In this work, inspired by the samara, we present a lightweight aircraft with an exceptionally simple design featuring a single actuator and a mono airfoil. To optimize the flight configuration for minimal power consumption, we employed a Surrogate optimization method that integrates spinning airfoil dynamics, motor-propeller efficiency, and hovering equilibrium. As a result, the proposed vehicle achieves position-controlled hovering flight for up to 26 minutes with a takeoff weight of only 32 grams. Its superior power efficiency is demonstrated by a high power loading of 9.1 grams per watt. Compared to state-of-the-art systems, the proposed design shows significant improvements in both flight endurance and power efficiency. The reliable and stable position-holding flight over an extended period further validates the effectiveness of the proposed methods and the practical applicability of the fabricated prototype.

关键词： Actuators Aerodynamics Automotive components Robots Propellers Torque Spinning Power demand Atmospheric modeling Payloads

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