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第三十八届中国控制会议

作者： Liang Han Xiwang Dong Qingdong Li Ming Ma Zhang Ren School of Sino-French Engineer Beihang University School of Automation Science and Electronic Engineering Science and Technology on Aircraft Control Laboratory Beihang University Shaanxi Key Laboratory of Integrated and Intelligent Navigation Xi'an Research Institue of Navigation Technology

Distributed time-varying formation control problems for multi-agent system with transmission delays and double-integrator dynamics on directed graphs are addressed in this ***,a distributed formation protocol,which considers time-varying transmission delays,is *** using graph theory and linear algebra,timevarying formation control problem is processed into a stability *** on Lyapunov functional approach,Some sufficient criteria for time-delayed multi-agent systems with double-integrator dynamics are further ***,the feasibility of research results is verified by numerical simulations.

关键词： Multi-agent system Time-varying formation Double-integrator dynamics Transmission delays

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Mechanical wear debris feature,detection,and diagnosis：A review

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Chinese Journal of Aeronautics 2018年第5期31卷 867-882页

作者： Wei HONG Wenjian CAI Shaoping WANG Mileta M.TOMOVIC School of Electrical and Electronic Engineering Nanyang Technological University 639798 Singapore School of Automation Science and Electric Engineering Beihang University Beijing 100083 China Science and Technology on Aircraft Control Laboratory Beijing 100083 China Mechanical and Aerospace Engineering Department Old Dominion University VA 23529 USA

Mechanical debris is an important product of friction wear, which is also a crucial approach to know the running status of a machine. Many studies have been conducted on mechanical debris in related fields such as tribology, instrument, and diagnosis. This paper presents a comprehensive review of these studies, which summarizes wear mechanisms（e.g., abrasive wear, fatigue wear, and adhesive wear） and debris features（e.g., concentration（number）, size, morphology, and composition）, analyzes detection methods principles（e.g., offline： spectrograph and ferrograph, and online： optical method, inductive method, resistive-capacitive method, and acoustic method）,reviews developments of online inductive methods, and investigates the progress of debris-based diagnosis. Finally, several notable problems are discussed for further studies.

关键词： Debris detection Debris feature Fault diagnosis Mechanical wear debris Wear mechanism

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Finite element analysis of electromagnetic field and pump sleeve of axial piston hydraulic motor pump based on ANSYS

Finite element analysis of electromagnetic field and pump sl...

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CSAA/IET International Conference on aircraft Utility Systems, AUS 2018

作者： Gao, Dianrong Sun, Ya-Nan Xu, Senhao Zhang, Yan College of Mechanical Engineering Yanshan University Qinhuangdao China National Key Laboratory of Science and Technology on Aircraft Control Facri Xi'an China

ISBN: (纸本)9781785617911

The finite element analysis software ANSYS was used to establish the two-dimensional finite element model of the stator and rotor of the axial piston hydraulic motor pump. The numerical calculation and analysis of the driving magnetic field were carried out. The result shows that the distribution of the magnetic field in the oil gap with hydraulic oil was uniform. The statics analysis of pump sleeve which is the key part of motor pump was performed through extracting the parameters of magnetic field torque and other data as the force conditions. It turns out that the distribution of the deformation, stress and shearing force of the pump sleeve under the stress condition was studied. It is concluded that the maximum deformation of the pump sleeve occurs at the shaft shoulder and at the end face of the pump sleeve positioning piston pump cylinder. The research provided reference and basis for the design and related calculation of motor pump. © 2018 IET Conference Publications. All rights reserved.

关键词： Finite element method

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Envelope Protection control for an Active Side Stick System of the Large Civil aircraft

Envelope Protection Control for an Active Side Stick System ...

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2018 IEEE CSAA Guidance, Navigation and control Conference, CGNCC 2018

作者： Zhou, Guangrui Liu, Shiqian Qin, Tiancheng Wang, Xudong Sang, Yuanjun Jingzhou, Zhao Niu, Erzhuo Shanghai Jiaotong University School of Aeronautics and Astronautics Shanghai200240 China Commercial Aircraft Corporation of China Department of Flight Control Shanghai200436 China FACRI Science and Technology on Aircraft Control Laboratory Xi' an710065 China

ISBN: (纸本)9781538611715

For the problem of envelope protection (EP) of the large aircraft an active side stick (ASS) control law is proposed. Based on a coupling model of human in-the-loop system (HILS) with ASS, the control law of aircraft EP with ASS is designed by using the angle of attack limiter (AOAL). Two cases of AOA tracking control with the AOA limiter and with ASS are simulated and the results show the proposed approaches are feasible and effective. © 2018 IEEE.

关键词： Angle of attack

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Practical adaptive time-varying output formation tracking for high-order nonlinear multi-agent systems using neural networks

Practical adaptive time-varying output formation tracking fo...

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第三十八届中国控制会议

作者： Jianglong Yu Xiwang Dong Qingdong Li Zhang Ren Ming Ma School of Automation Science and Electrical Engineering Science and Technology on Aircraft Control Laboratory Beihang University Shananxi Key Laboratory of Integrated and Intelligent Navigation Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Xi'an Research Institute of Navigation Technology

Practical adaptive time-varying output formation tracking problems for high-order nonlinear strict-feedback multiagent systems are investigated in this paper. The time-varying output formation tracking requires the followers' output vectors to track the output vector of the leader while achieving a time-varying formation. The dynamics of the leader and the followers can have uncertain mismatched nonlinearities while the leader's control input is also unknown. To deal with the mismatched nonlinearities, the backstepping techniques are utilized to construct the protocols. Firstly, visual controllers are designed to overcome the effects of the uncertainties while guaranteeing the stability of each layer. The complicated visual controllers are estimated by the neural networks. A full adaptive protocol is constructed with adaptive gains to avoid using the global information of the interaction topology. Then, an algorithm is presented to design the protocol, whose parameters are much less. Besides, the stability of the algorithm is proved by Lyapunov theories. Finally, simulation results are presented to prove the effectiveness.

关键词： Practical time-varying formation tracking Adaptive control High-order nonlinear dynamics Multi-agent systems Neural networks

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The design of special energy conversion device of integrated self-powered brake system

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Journal of Physics: Conference Series 2021年第1期2029卷

作者： Weizhi Qiao Ding-bo Li Xiang Gao Xiaochao Liu Hao Zhang Renjie Li Xiyu Wang Yanze Hou Chong Chen Ningbo Institute of Technology Beihang University Ningbo 315800 China School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Science and Technology on Aircraft Control Laboratory Beihang University Beijing 100191 China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou 310027 China Research Institute for Frontier Science Beihang University Beijing 100191 China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology Beijing 100094 China

In recent years, a novel electro-hydraulic integrated self-powered brake system for aircraft has been proposed. A modular "self-powered device" is installed near the wheel to recover the rotational kinetic energy when the wheel lands and convert it into hydraulic energy for braking. The energy conversion device is the compact high-power-weight ratio energy harvesting mechanism, which needs to be designed in the extremely narrow internal space of the wheel. At the same time to ensure high reliability, high strength, high power weight ratio, difficult, and wheel brake disc internal temperature reaches 600 °C above, this to the design of the can take institutions are challenges. In this paper, the high strength compact high power-weight ratio energy conversion device as the research goal, through new principles, new structure, new materials, new technology, new methods and other means of the energy taking mechanism design and development, and finally achieve the strength, stiffness, reliability, life of the energy conversion device to meet the requirements of the system.

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Design Simulation and Structure Optimization of Plunger Assembly Closing

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Journal of Physics: Conference Series 2021年第1期2029卷

作者： Weizhi Qiao Zhenyu Wang Xiang Gao Xiaochao Liu Zhongyi Qiu Yanze Hou Chong Chen Ningbo Institute of Technology Beihang University Ningbo Zhejiang 315800 China School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Science and Technology on Aircraft Control Laboratory Beihang University Beijing 100191 China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University Hangzhou Zhejiang 310027 China Research Institute for Frontier Science Beihang University Beijing 100191 China Qian Xuesen Laboratory of Space Technology China Academy of Space Technology Beijing 100094 China

Hydraulic motors and pumps are the core components in hydraulic systems. The plunger assembly is a key component for the realization of the function of the axial piston pump and motor. The coupling between the slipper and the plunger body is completed through the closing process. With the application of computational science and finite element technology, DEFORM-3D metal forming process simulation is used to establish the corresponding closing device model of the plunger assembly. Through simulation, we analyze the change law of metal flow during plastic deformation process, and carry out structural optimization design based on the simulation results. We found that the closing is completed under the appropriate cone angle and distance line of the shoe, the quality is relatively uniform, and there is no closing defects such as metal flow overflow and cracks. The pull-off force and the clearance value after rolling can meet the design requirements. This method not only can effectively shorten the product verification cycle and reduce the cost, but also can reduce the defects of the finished product and improve the yield rate, providing a new way for the design of the closing structure and closing model of the plunger assembly.

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Distributed State Estimation for Heterogeneous Mobile Sensor Networks with Sensor Faults

Distributed State Estimation for Heterogeneous Mobile Sensor...

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第三十八届中国控制会议

作者： Yingrong Yu Siting Peng Qingdong Li Xiwang Dong Zhang Ren Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical Engineering Beihang University Beijing Electro-Mechanical Engineering Institute Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University

Consensus-based distributed state estimation for homogeneous mobile sensor networks has been widely studied currently. However, the sensors used for target detection and tracking in practical applications usually have different physical properties, different measuring range or accuracy. In order to realize data exchange between sensors which are of heterogeneity and to obtain a consistent and precise target state estimation result, an improved Cubature Kalman Filtering(CKF) method based on weighted average consensus theory is put forward herein. Moreover, the adverse impacts caused by sensor faults have been taken into consideration in modeling. The stochastic boundedness of the estimation errors for the discussed sensor networks is proved in the paper. Finally, numerical simulations are provided to demonstrate the validity of the proposed method.

关键词： Cubature Kalman Filter weighted average consensus theory target state estimation mobile sensor networks stochastic boundedness

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Time-varying formation control and disturbance rejection for UAV-UGV heterogeneous swarm system

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Hangkong Xuebao/Acta Aeronautica et Astronautica Sinica 2020年 41卷

作者： Zhou, Siquan Dong, Xiwang Li, Qingdong Ren, Zhang School of Automation Science and Electrical Engineering Beihang University Beijing100083 China Science and Technology on Aircraft Control Laboratory Beihang University Beijing100083 China Beijing Advanced Innovation Center for Big Data and Brain Computing Beihang University Beijing100083 China

This paper studies the time-varying formation control and disturbance rejection problems for heterogeneous UAV-UGV swarm system. The UAV-UGV swarm system is designed to achieve the desired time-varying output formation under unknown external disturbances. First, the kinetic and dynamic mathematical models of each UAV/UGV are established. In addition, the cooperative control models for heterogeneous swarm system are constructed by using the algebraic graph theory. Then, a distributed time-varying output formation controller is designed based on the internal model theory. The distributed formation center estimator and disturbance rejection compensator are designed and added to the formation controller. Third, an algorithm is presented to design the formation control parameters, where the feasibility conditions for achieving the time-varying output formation are given. The stability of the closed-loop UAV-UGV swarm system is proved. Finally, a simulation example is provided to demonstrate the effectiveness of the proposed formation control approach. © 2020, Beihang University Aerospace Knowledge Press. All right reserved.

关键词： Unmanned aerial vehicles (UAV)

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Numerical investigation of influence of structure and operating parameters on performance of vortex oil filter

Numerical investigation of influence of structure and operat...

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CSAA/IET International Conference on aircraft Utility Systems, AUS 2018

作者： Wang, Ning Chen, Weijian Ning, Guoli Hui, Ma Key Laboratory of Aircraft Environment Control and Life Support MIIT Nanjing University of Aeronautics and Astronautics Nanjing China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing China

ISBN: (纸本)9781785617911

In this paper, the three-dimensional numerical simulation of solid-liquid two-phase flow in a vortex oil filter is performed by means of numerical simulation. The Reynolds stress turbulence model is used in the simulation flow field, and the DPM model is used for solid particle tracking. The influence of key structural parameters and operating parameters on the filtering effect was mainly studied, such as the inlet width, the size of the overflow pipe, the wall thickness and the insertion depth, the size of the cone angle and the length of the cone end. The results provide the basis for the rational design of the vortex oil filter. © 2018 IET Conference Publications. All rights reserved.

关键词： Vortex flow

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