检索结果-内蒙古大学图书馆

18th International Conference on control, Automation and Systems, ICCAS 2018

作者： Jingping, Shi Yongxi, Lv Xiaobo, Qu Jing, Shi School of Automation Northwestern Polytechnical University Xi’an710072 China Science and Technology on Aircraft Control Laboratory Xi’an710072 China

ISBN: (纸本)9788993215151

As one of the most important technologies of the advanced fighter, thrust vector technology can greatly increase the range of controlled angle of attack, and make the fighter easily realize the post stall maneuver. However currently thrust vector technology is achieved by manually manipulating the additional vector stick, which greatly increases the burden on pilots. Thus how to bring the thrust vector control into the automatic control system to reduce the pilot operation burden has become an important engineering problem to be solved. A dynamic inverse design method based on daisy chain allocation method is proposed, which integrates the thrust vector into the automatic control system, thus eliminating the thrust vector manipulating mechanism and reducing the pilot's operating burden. In addition, the method maximizes the use of the control surface and reduces the use time of the thrust vector, thus effectively reducing the maintenance cost of the engine. The simulation results of vector cylinder maneuver shows that this method can effectively achieve the coordinated control of thrust vector. © ICROS.

关键词： Vectors

来源：评论

学校读者我要写书评

暂无评论

Formation tracking control for time-delayed multi-agent systems with second-order dynamics

引用

Chinese Journal of Aeronautics 2017年第1期30卷 348-357页

作者： Han Liang Dong Xiwang Li Qingdong Ren Zhang Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical EngineeringBeihang University

In this paper, formation tracking control problems for second-order multi-agent systems（MASs） with time-varying delays are studied, specifically those where the position and velocity of followers are designed to form a time-varying formation while tracking those of the leader. A neighboring relative state information based formation tracking protocol with an unknown gain matrix and time-varying delays is presented. The formation tracking problems are then transformed into asymptotically stable problems. Based on the Lyapunov-Krasovskii functional approach, conditions sufficient for second-order MASs with time-varying delays to realize formation tracking are examined. An approach to obtain the unknown gain matrix is given and, since neighboring relative velocity information is difficult to measure in practical applications, a formation tracking protocol with time-varying delays using only neighboring relative position information is introduced. The proposed results can be used on target enclosing problems for MASs with second-order dynamics and time-varying delays. An application for target enclosing by multiple unmanned aerial vehicles（UAVs） is given to demonstrate the feasibility of theoretical results.

关键词： Formation tracking control Multiple unmanned aerialvehicles Second-order dynamics Time-delayed multi-agentsystems Time-varying formation

来源：评论

学校读者我要写书评

暂无评论

Distributed Formation control for Time-delayed Multi-agent Systems with Double-integrator Dynamics

Distributed Formation Control for Time-delayed Multi-agent S...

引用

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

来源：评论

学校读者我要写书评

暂无评论

Fault-tolerant control for over-actuated hypersonic reentry vehicle subject to multiple disturbances and actuator faults

引用

Aerospace science and technology 2019年 87卷 230-243页

作者： Yue Yu Honglun Wang Na Li School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Science and Technology on Aircraft Control Laboratory Beihang University Beijing 100191 China Unmanned System Research Institute Beihang University Beijing 100191 China

In this paper, a fault-tolerant control scheme is proposed for attitude tracking problem of hypersonic reentry vehicle subjected to multiple disturbances and time-varying actuator faults. For convenience of fault-tolerant controller design , conventional hypersonic reentry vehicle model is transformed into control-oriented model by incorporating actuator faults into lumped disturbance. Based on the lumped disturbance estimate provided by high order sliding mode observer, fault-tolerant controllers are developed within the frame of active disturbance rejection control in attitude loop and angular rate loop according to time-scale separation and singular perturbation principle. Then, the desired control moment is allocated to actuators based on recurrent neural network . With the well-designed fault-tolerant controllers and control allocation, a novel meta-heuristic dynamic adaptation salp swarm algorithm is employed to optimize control parameters to achieve minimum attitude tracking error. Comparative simulations are conducted to verify the effectiveness of the developed dynamic adaptation salp swarm algorithm and the investigated fault-tolerant control scheme.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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...

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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...

引用

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

来源：评论

学校读者我要写书评

暂无评论

Design Simulation and Structure Optimization of Plunger Assembly Closing

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

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

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：