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Chinese control and Decision Conference, CCDC

作者： Weihao Li Yang Zhu Bo Zhu Kaiyu Qin Mengji Shi School of Aeronautics and Astronautics University of Electronic Science and Technology of China Chengdu Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province Chengdu School of Information Science and Technology Southwest Jiaotong University Chengdu School of Aeronautics and Astronautics Sun Yat-Sen University Guangzhou

ISBN: (纸本)9781665478977

This paper provides an insight into the accurate output tracking control for non-minimum phase (NMP) systems. A novel iterative redefinition-based approach is proposed to overcome the inherent drawbacks of classic output-redefinition methods. Specifically, a feasible minimum phase (MP) output is first identified by the output redefinition. Then the desired output trajectory is iteratively redefined such that the state references for the new MP system could approximate those for the original NMP system within arbitrarily small errors. With the redefined reference signals, a controller in a "feedforward + feedback" configuration is employed to simultaneously achieve the accurate tracking of output trajectory and the stabilizing of internal dynamics. An application of this control framework to F-16 aircraft is presented, which is further verified by numerical simulations, showing significant performance improvement by the proposed output reference iterative redefinition algorithm.

关键词： Simulation Heuristic algorithms Numerical simulation Iterative algorithms Trajectory Feedback control aircraft

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Interaction between Double Solitons in Anti-Pt Symmetric Synthetic Photonic Lattices

SSRN

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SSRN 2022年

作者： Yue, Yazhou Li, Jun Zhang, Zhiqing Gao, Tianxiang Wen, Zengrun Wang, Haohao Qi, Xinyuan Flight Automatic Control Research Institute Xi’an710065 China National Key Laboratory of Science and Technology on Aircraft Control Xi’an710065 China School of Physics Northwest University Xi’an710127 China Shandong Provincial Key Laboratory of Optics and Photonic Devices College of Physics and Electronics Shandong Normal University Jinan250014 China

An anti-parity-time symmetry (anti-PT symmetric) double fiber loop synthetic photonic lattice is constructed theoretically by projecting the intensity of two loops and adjusting the phase and gain/loss distribution. Numerical studies on pulse dynamics show that the trajectories of double-pulse solitons may be maniputlated by tuning the initial relative phases, pulse separation, nonlinearity, and non-Hermitian characteristics of the system. Our research may provide a new way to realize logic gate devices and optical switches in optical interconnection and optical communications. © 2022, The Authors. All rights reserved.

关键词： Optical lattices

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Modeling and simulation of aircraft ground taxiing based on flightgear visualization

Modeling and simulation of aircraft ground taxiing based on ...

引用

CSAA/IET International Conference on aircraft Utility Systems 2020, AUS 2020

作者： Zhang, Hao Bai, Ning Shang, Yaoxing Jiao, Zongxia Li, Yanpeng School of Automation Science and Electrical Engineering Beihang University Beijing China Science and Technology on Aircraft Control Laboratory Beihang University Beijing100191 China Ningbo Institute of Technology Beihang University Ningbo315800 China

ISBN: (纸本)9781839535635

Research on aircraft flight control has been widely studied as a hotspot. However, the characteristics on the ground is relatively unpopular. The simulation platforms for flight control is designed more accurate in the air rather than on the ground, and the platforms for ground vehicles needs to be customized. Considering that the ascendancy of the generality of Matlab/Simulink and the visualization of open source software Flightgear, this paper proposed a way to get them connected with each other. Detailed dynamics equations of the aircraft and subsystems are established, and simulations are carried out to demonstrate the characteristics. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Visualization

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Ultra-wide Stopband Waveguide Low-pass Filter Design Based on Asymmetric Inductance Unit Structure

Ultra-wide Stopband Waveguide Low-pass Filter Design Based o...

引用

IEEE International Conference on Circuits and Systems (ICCS)

作者： Huan Zou Jingyi Wu Maochao Zhu University of Electronic Science and Technology of China Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province Chengdu China University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9781665429634

This paper presents a new design method for ultra-wide stopband waveguide low pass filter based on asymmetric inductance unit structure. Firstly, the initial design of the filter can be completed quickly through the inductive unit and capacitor unit circuit simulation and the three-dimensional electromagnetic simulation. Secondly, through the analysis of the field distribution of the typical resonance frequency of the filter parasitic passband, it is determined that the high-frequency parasitic oscillation of the filter inductance unit is the main reason for the deterioration of the filter stopband. Therefore, based on the design idea of the asymmetric inductance unit structure, the staggered distribution characteristics of the out-of-band resonance frequency points of the filter are optimized, and the structure design of the X-band wide stopband waveguide low-pass filter is realized. Simulation and measurement results show that the filter has a passband frequency response of 9.7~11GHz, and the stopband frequency range of 11.8GHz~43GHz achieves the suppression greater than 50dB.

关键词： Inductance Solid modeling Harmonics suppression Low-pass filters Resonant frequency Electromagnetic waveguides Frequency measurement

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Research on a full envelop controller for an unmanned ducted-fan helicopter based on switching control theory

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science China(Technological sciences) 2019年第10期62卷 1837-1844页

作者： WANG Yin SONG HongYi LI Qiang ZHANG Hui College of Astronautics Nanjing University of Aeronautics and AstronauticsNanjing210016China Science and Technology on Aircraft Control Laboratory Flight Automatic Control Research InstituteXi’an710000China

Rotor and ducted-fan structured unmanned helicopters have shown energy efficiency in low flight speed and hovering, due to the novel ducted-fan structure. However, its aerodynamic characteristics may change dramatically when flight at higher speed,resulting in a wide flight envelope when compared with conventional structured helicopters. Hence, the flight controller is required to schedule itself based on the flight states and guarantees the overall performances of the helicopter on the entire flight envelop. This paper presents a switching system theory based approach to design the optimal controllers over a wide region of flight envelop. In the proposed method, a family of robust controller are designed based on typical operational conditions and the controller is adjusted to guarantee the stability when the switching event is trigged. A hysteresis switching logic is utilized to ensure smooth transient between specific operational subspaces. The stability of the proposed control method was analyzed through Lyapunov theory. Nonlinear simulations based flight dynamics of the prototype helicopter have demonstrated the flexibility and efficiency of the proposed work.

关键词： switching system robust control unmanned helicopter flight control

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An Ultra-Sensitivity Cancellation Type Sensor Based on Microstrip Meander-Line

An Ultra-Sensitivity Cancellation Type Sensor Based on Micro...

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IEEE International Conference on Circuits and Systems (ICCS)

作者： Xiaoqin Liu Huan Zou Bo Zhu Hui Lin Haiyang Wang University of Electronic Science and Technology of China Chengdu China Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9781665429634

The analysis of dielectric properties in Novel Coronavirus (COVID-19) has become an important research branch since the outbreak of the epidemic in 2019. In order to detect the dielectric properties of microfluidics like virus with higher sensitivity, a radio frequency sensor model is proposed in this paper. First, based on the excellent characteristics of the microstrip meander-line such as more concentrated electric field distribution, the microstrip meander-line is introduced into the design of traditional cancellation sensor, which is called the meander sensor. Then, the relationship between transmission coefficients of the system and dielectric properties of microfluidics is given in this paper. The simulation results verify the ultra-sensitivity of the meander sensor. Even though the relative permittivity of microfluidics is changed in the order of magnitude 10 −2 , the measurement results of the meander sensor also change significantly. However, the straight sensor can only measure changes of relative permittivity in the order of magnitude 10 −1 . What’s more, there is a more concentrated measurement range for the meander sensor. This will be more practical for measuring weak changes of dielectric properties caused by the microfluidics itself and its interactions.

关键词： COVID-19 Epidemics Sensitivity Permittivity measurement Simulation Dielectrics Microstrip

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Optimal design of fast switching valves in digital displacement machine

Optimal design of fast switching valves in digital displacem...

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CSAA/IET International Conference on aircraft Utility Systems 2020, AUS 2020

作者： Wei, Renlei Wu, Shuai Zhang, Hao School of Automation Science and Electrical Engineering Beihang University Beijing100191 China Science and Technology on Aircraft Control Laboratory Beihang University Beijing100191 China Ningbo Institute of Technology Beihang University Ningbo315800 China

ISBN: (纸本)9781839535635

The digital displacement(DD) machine is a high-efficiency intelligent hydraulic machine. The DD machine works in three modes which is controlled by the working sequence of the fast switching valve. The fast switching valve used in DD machine requires both less switching time and power loss. The dynamic model and control method of the DD machine is built assuming the loss of the DD machine occurs in the valve switching only. Then, the efficiency map with the normalized switching time and flow coefficient is drawn to get the requirements for the valve. For a type of poppet valve, the fluid field of the valve is optimized based on the angle of sleeve and the radius of the optimal spool. Using the computer fluid design(CFD) instead of the real experiments, it's easy to get a optimal field geometry of the valve in the set of valve parameters. Finally a fast switching valve is manufactured according to the selected optimized parameters of the valve. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Efficiency

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Neural Network-Cascade UDE Based Tracking control of Leader-Follower Agents with Compound Uncertainties

Neural Network-Cascade UDE Based Tracking Control of Leader-...

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Computers and Automation (CompAuto), International Conference on

作者： Tong Li Weihao Li Zhiqiang Li Mengji Shi Boxian Lin Zixuan Liu AVIC Chengdu Aircraft Design and Research Institute Chengdu China Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9781665423724

This paper concerns with the multi-agent distributed leader-follower tracking control problems in the presence of compound uncertainties. These unknown time-varying parts not only lie in the both integral units of the second-order follower dynamics, but also show up in the leader’s kinematics. A cascade uncertainty and disturbance estimator (CUDE) based backstepping controller is designed for the followers, which is capable of handling the model uncertainties and input disturbances that respectively appearing in their first-and second-order integral units. However, UDE based methods require accurate modeling of the control system, while the leader is not controllable. Thus, for the leader, the uncertain parts are compensated by constructing a neural network (NN) estimation mechanism. Adaptive estimation parameters are designed according to Lyapunov stability theories to enhance the robustness of the system. The combination of NN and CUDE requires less computational resource than conventional NN-based methods while enabling a valuation of the uncertainty in the leader’s equation. Finally, a numerical simulation is conducted to verify the effectiveness of the control scheme.

关键词： Adaptation models Uncertainty Artificial neural networks Switches Numerical simulation control systems Robustness

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Adaptive iterative learning control for impact load cyclic fatigue simulator of aircraft

引用

Chinese Journal of Aeronautics 2025年

作者： Shuai WU Sheng SHU Renjie LI Yaoxing SHANG Zongxia JIAO School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Key Laboratory of Advanced Aircraft Systems Beihang University Beijing 100191 China Science and Technology on Aircraft Control Laboratory Beihang University Beijing 100191 China Ningbo Institute of Technology Beihang University Ningbo 315800 China Tianmushan Laboratory Hangzhou 310023 China

The aircrafts have many structural components that withstand repeated impact loads, which may accumulate fatigue and potentially cause major accidents. To simulate repeated impact loads, it is imperative to design an impact load cyclic fatigue simulator that applies repeated impact loads to structural components, such as landing gears. Furthermore, the impact load simulator must simulate various loads, and the identical set of parameters employed in conventional controllers are challenging to apply to varying operational conditions. Consequently, the controller must possess learning and adaptive capabilities. Based on the characteristics of repeated impact loads, an adaptive iterative learning control (AILC) based on the backstepping method is developed in this study. This AILC comprises backstepping control law, parameter adaptation law, iterative learning law, and robust dynamical control term. The adaptation law is not only utilized to estimate unknown system parameters, but also for online identification of system parameters. The iterative learning law can be utilized to learn the characteristics of the system under repeated operating conditions. The robust dynamical control term ensures the stability of the entire system. The experimental results indicate that the AILC can achieve tracking error convergence within a finite time and effectively achieve high-precision torque command tracking.

关键词： Load simulator Repeated impact load Adaptive control Iterative learning control Robust dynamical control

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Penetration trajectory optimization for the hypersonic gliding vehicle encountering two interceptors

arXiv

引用

arXiv 2022年

作者： Shen, Zhipeng Yu, Jianglong Dong, Xiwang Hua, Yongzhao Ren, Zhang School of Automation Science and Electrical Engineering Science and Technology on Aircraft Control Laboratory Beihang University Beijing100191 China Institute of Artificial Intelligence Beihang University Beijing100191 China Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Beijing100191 China

The penetration trajectory optimization problem for the hypersonic gliding vehicle (HGV) encountering two interceptors is investigated. The HGV penetration trajectory optimization problem considering the terminal target area is formulated as a nonconvex optimal control problem. The nonconvex optimal control problem is transformed into a second-order cone programming (SOCP) problem, which can be solved by state-of-the-art interior-point methods. In addition, a penetration strategy that only requires the initial line-of-sight angle information of the interceptors is proposed. The convergent trajectory obtained by the proposed method allows the HGV to evade two interceptors and reach the target area successfully. Furthermore, a successive SOCP method with a variable trust region is presented, which is critical to balancing the trade-off between time consumption and optimality. Finally, the effectiveness and performance of the proposed method are verified by numerical simulations. Copyright © 2022, The Authors. All rights reserved.

关键词： Numerical methods

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