检索结果-内蒙古大学图书馆

34th Chinese control Conference, CCC 2015

作者： Yabin, Zhang Lei, Guo Haibin, Sun Wenhua, Chen Sen, Wang School of Instrument Science and Opto-Electronics Engineering Beihang University Beijing China National Key Laboratory of Aerospace Intelligent Control Technology Beijing Aerospace Automatic Control Institute Beijing China School of Automation Science and Electrical Engineering Beihang University Beijing China Department of Aeronautical and Automotive Engineering Loughborough University Loughborough United Kingdom

ISBN: (纸本)9789881563897

The landing accuracy of a Mars lander is severely affected by a wide range of disturbances at the powered descent stage. To address this problem, a composite guidance law is proposed in this paper. The composite guidance law is developed by the combination of disturbance observer-based control (DOBC) technique and multiple sliding surfaces guidance (MSSG) theory. Compared with other guidance laws, the proposed method achieves promising disturbance rejection performance and high landing accuracy in both position and velocity, reducing the conservatism to a certain extent. The proposed guidance law does not require any off-line trajectory generation and its global stability is verified by using Lyapunov direct method. Simulation results show that the proposed guidance law is superior to the conventional guidance laws in terms of both disturbance rejection and landing accuracy. © 2015 Technical Committee on control Theory, Chinese Association of automation.

关键词： disturbance observer-based control Mars pinpoint landing multiple disturbances multiple sliding surfaces guidance powered descent

来源：评论

学校读者我要写书评

暂无评论

Mathematical modelling and sensitivity analysis of multipolar radiofrequency ablation in the spine 9

Mathematical modelling and sensitivity analysis of multipola...

引用

9th IFAC Symposium on Biological and Medical Systems, BMS 2015

作者： Matschek, Janine Himmel, Andreas Von Haeseler, Friedrich Bullinger, Eric Skalej, Martin Findeisen, Rolf Laboratory for Systems Theory and Automatic Control Otto-von-Guericke University Magdeburg Germany Forschungscampus STIMULATE Magdeburg Germany Department of Process Systems Engineering Otto-von-Guericke University Magdeburg Germany Institute for Neuroradiology University Hospital of Magdeburg Germany

Mathematical models of the radiofrequency ablation enable to plan, monitor and control interventions allowing to predict and improve their outcome. A system of coupled partial differential equations suitable for planning, analysis and real time implementation is proposed to model the multipolar radiofrequency ablation under consideration of capillary blood perfusion in the spine. To address the multipolar operation, time dependent boundary conditions to the model are introduced. Accounting for the application in the spine, consisting of various tissue types, we consider spatially distributed model parameters. Since the spatially distributed parameters play a key role, analytic expressions for a sensitivity analysis are derived. Based on the model, simulations are performed underlining the quality of the approach and analysing the influence of the spatially distributed parameters. © 2015, IFAC (International Federation of automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Sensitivity analysis

来源：评论

学校读者我要写书评

暂无评论

Design and Analysis of a Direct Load Sensing Electro-Hydrostatic Actuator

Design and Analysis of a Direct Load Sensing Electro-Hydrost...

引用

2015 International Conference on Fluid Power and Mechatronics

作者： Song Zengning Jiao Zongxia Shang Yaoxing Wu Shuai Hu Wunong Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical Engineering Beihang University AVIC Xi'an Flight Automatic Control Research Institute

This paper describes the design and analysis of a direct load sensing electro-hydrostatic actuator(EHA) to solve the heating problem of the motor in current EHAs. The design utilizes load sensing technology to automatically adjust the variable displacement pump, so that the motor can work in the high efficiency area to reduce the heating. Especially it can significantly enhance the efficiency of EHA under high load and slow rate conditions. Based on analysis of the principle of load sensing EHA, this article demonstrates the feasibility of load sensing EHA. Simulation and experimental data show that direct load sensing EHA can improve motor heating problem and limit energy loss.

关键词： electro-hydrostatic actuator load sensing variable displacement pump energy loss

来源：评论

学校读者我要写书评

暂无评论

control method and applications of robust trajectory linearization via nonlinear differentiators

引用

Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics 2015年第7期41卷 1259-1268页

作者： Shao, Xingling Wang, Honglun Zhang, Huiping Zhang, Xiaofeng School of Automation Science and Electrical Engineering Beijing University of Aeronautics and Astronautics Beijing100191 China Science and Technology on Aircraft Control Laboratory Beijing University of Aeronautics and Astronautics Beijing100191 China Beijing Aerospace Automatic Control Institute Beijing100854 China

Considering the lack of enough robustness against uncertainties in conventional trajectory linearization control (TLC) method, an improved robust control method was proposed, based on the design principle of nonlinear differentiators. Firstly, via introducing the concept of second-order linear differentiator (SOLD), it was indicated that peaking phenomenon which was similar with using high-gains in SOLD would emerge during the transient profile of differentiation of the nominal command in the existing TLC. And then, tracking differentiator (TD) was used to produce the nominal command and its derivative, peaking phenomenon was totally eliminated and the ability of adjusting the response speed of closed-loop system under the physical limitations was endowed simultaneously. Secondly, by constructing the desired tracking error dynamics of closed-loop system, the control law of the linear time-varying (LTV) system could be directly obtained, PD-spectrum theorem and real time tuning of the time varying bandwidth (TVB) of TLC were both avoided. Meanwhile, by utilizing the non-perturbation form of hybrid differentiator (HD) as the desired error dynamics of closed-loop system, the robustness of the system was thus enhanced. In addition, the boundedness of the tracking error in interference system was proved by Lyapunov theory. Finally, the proposed method was applied to the attitude tracking problem of hypersonic vehicle. The simulation results demonstrate the proposed method can still exhibit better control performance and anti-interference capability even if there exist large uncertainties in the aerodynamic parameters, thus the effectiveness and robustness of the control scheme is validated. ©, 2015, Beijing University of Aeronautics and Astronautics (BUAA). All right reserved.

关键词： Robust control

来源：评论

学校读者我要写书评

暂无评论

Online identification of multivariable nonlinear processes with iterative structure learning and application to a diesel engine 19

Online identification of multivariable nonlinear processes w...

引用

19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Kowalczyk, Marek Yi, Boliang Isermann, Rolf Institute of Automatic Control and Mechatronics Laboratory of Control Engineering and Process Automation Technical University Darmstadt Germany

ISBN: (纸本)9783902823625

This contribution presents a new methodology for the online identification, which allows the modeling of the stationary and dynamic behavior of nonlinear combustion engines with many input and output variables in short time with an appropriate model structure. The used models are local polynomial model trees. The necessary enhancements and adaptations of the identification algorithm for local polynomial model trees for the online methodology are presented. To enable an online identification, not only the parameters but also the structure of the models has to be adapted to the ongoing measuring procedure at a test bench. This structure adaptation methods use iteratively recorded measured data for the determination of an optimized model partition and regressor selection regarding the quality and complexity of the model. This maximizes the iterative improvement of the mathematical model, leading to a reduced test bench time. The applicability of the developed methodology is shown for the identification of a model from both, an artificial test function as well as a real diesel engine. © IFAC.

关键词： Iterative methods

来源：评论

学校读者我要写书评

暂无评论

Enhanced trajectory linearization control based advanced guidance and control for hypersonic reentry vehicle with multiple disturbances

引用

Aerospace Science and Technology 2015年 46卷 523-536页

作者： Xingling Shao Honglun Wang HuiPing Zhang School of Automation Science and Electrical Engineering Beihang University Beijing 100191 China Science and Technology on Aircraft Control Laboratory Beihang University Beijing 100191 China School of Automation Beijing Institute of Technology Beijing 100081 China Beijing Aerospace Automatic Control Institute Beijing 100854 China

In this paper, the guidance and control problem for hypersonic reentry vehicle (HRV) in the presence of control constraints and multiple disturbances is handled based on unified enhanced trajectory linearization control (TLC) framework under reference-tracking methodology. First, based on the nominal trajectory and open-loop command generated by Gauss pseudo-spectral method (GPM), a time-varying feedback guidance law with integral action is synthesized to stabilize the tracking error dynamics along the nominal trajectory under the framework of TLC. Second, to improve the robustness of attitude and angular rate loop, variations of various aerodynamic coefficients and external disturbances are considered as lumped uncertainties, reduced-order linear extended state observers (LESO) with given model information are constructed to estimate the lumped uncertainties in each loop, respectively. In addition, comparisons between the estimation efficiency of LESO and reduced-order LESO are carried out. Then augmented with the disturbance estimates and TLC control law, tracking errors of the rotational dynamics can be actively rejected without sacrificing nominal performances. More importantly, fewer control consumption and smooth transient performances are achieved by using nonlinear tracking differentiator (TD) in attitude loop. The stability of the resulting closed-loop system is well established based on Lyapunov stability theory . Finally, the effectiveness of the proposed advanced guidance and control strategy is verified through extensive simulations on the six-degree-of-freedom reentry flight.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Robust Second-Order Tracking of Multi-agent Systems without Velocity Measurements and with Input Saturation

Robust Second-Order Tracking of Multi-agent Systems without ...

引用

第三十四届中国控制会议

作者： Qingling Wang Changyin Sun Jian Hou Yingjiang Zhou School of Automation Southeast University Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education National Key Laboratory of Science and Technology on Aerospace Intelligence Control Beijing Aerosapce Automatic Control Institute Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781467374439

This paper investigates the robust second-order tracking problem of multi-agent systems without velocity measurements and with input saturation on detailed balanced directed communication topologies, where agents' dynamics are subject to uncertain and external disturbances. We first construct one distributed bounded controller for multi-agent systems without uncertain and external disturbances. Then, combined with the controller, one modifying uncertainty and disturbance estimator(UDE)is proposed to approximate the situation where neither the velocity measurements nor their asymptotic estimation is *** is shown that the synchronization errors are bounded and their ultimate bounds could be arbitrarily small by choosing some parameters appropriately. Simulation results are presented to show the effectiveness of the controllers.

关键词： Robust second-order consensus,without velocity measurements,uncertainty and disturbance estimator,input saturation.

来源：评论

学校读者我要写书评

暂无评论

Design and analysis of a direct load sensing electro-hydrostatic actuator

Design and analysis of a direct load sensing electro-hydrost...

引用

International Conference on Fluid Power and Mechatronics (FPM)

作者： Zengning Song Zongxia Jiao Yaoxing Shang Shuai Wu Wunong Hu Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical Engineering Beihang University Beijing CN Science and Technology on Aircraft Control Laboratory School of Automation Science and Electrical Engineering Beihang University Beijing China A VIC Xi'an Flight Automatic Control Research Institute Xi'an Shaanxi China

This paper describes the design and analysis of a direct load sensing electro-hydrostatic actuator (EHA) to solve the heating problem of the motor in current EHAs. The design utilizes load sensing technology to automatically adjust the variable displacement pump, so that the motor can work in the high efficiency area to reduce the heating. Especially it can significantly enhance the efficiency of EHA under high load and slow rate conditions. Based on analysis of the principle of load sensing EHA, this article demonstrates the feasibility of load sensing EHA. Simulation and experimental data show that direct load sensing EHA can improve motor heating problem and limit energy loss.

关键词： Sensors Heating Actuators Hysteresis motors Valves Copper Load modeling

来源：评论

学校读者我要写书评

暂无评论

Robust tracking control design for a flexible air-breathing hypersonic vehicle

引用

Journal of Central South University 2014年第1期21卷 130-139页

作者：张垚鲜斌刁琛赵勃郭建川 Institute of Robotics and Autonomous System Tianjin Key Laboratory of Process Measurement and ControlSchool of Electrical Engineering and AutomationTianjin University

A nonlinear robust controller was presented to improve the tracking control performance of a flexible air-breathing hypersonic vehicle(AHV) which is subjected to system parametric uncertainties and unknown additive time-varying *** longitudinal dynamic model for the flexible AHV was used for the control ***-gain observers were designed to compensate for the system uncertainties and additive *** gain theorem and Lyapunov based stability analysis were utilized to prove the stability of the closed loop *** uniformly ultimately bounded tracking of the vehicle's velocity,altitude and attack angle were achieved under aeroelastic effects,system parametric uncertainties and unknown additive ***/Simulink simulation results were provided to validate the robustness of the proposed control *** simulation results demonstrate that the tracking errors stay in a small region around zero.

关键词： hypersonic vehicles nonlinear robust control flexible mode small gain theorem Lyapunov

来源：评论

学校读者我要写书评

暂无评论

Multi-pipeline System Scheduling under Demand Uncertainty

Multi-pipeline System Scheduling under Demand Uncertainty

引用

第26届中国过程控制会议（CPCC2015）

作者： Wang Jishuai Gu De Suzhou Institute of Biomedical Engineering and Technology Chinese Academy of Sciences State Key Lab.of Industrial Control Technology Institute of Cyber-systems and Control Zhejiang University Key Laboratory of Advanced Process Control for Light Industry (Ministry of Education) Institute of Automation Jiangnan University

In this paper, a discrete mathematical approach to solve scheduling of multi-pipeline systems for petroleum products under demand uncertainty is presented. To deal with the uncertainty, the conditional value-at-risk(CVAR) analysis is adopted as a risk measure. Firstly an improved scheduling approach is proposed to model the multi-pipeline system with the consideration of different pipeline segment sizes. The improved formulation is computationally intractable when pipeline segments have distinct capacities. Then the model takes a scenario-based approach to cope with uncertainty in a CVAR framework. Computational results are presented to demonstrate the effectiveness of the proposed approach. All the instances are implemented using CPLEX.

关键词： Multiproduct pipeline Scheduling MILP formulation Pump

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：