检索结果-内蒙古大学图书馆

2015 International Conference on Fluid Power and Mechatronics

作者： Zhao Yifei Jiao Zongxia Wu Shuai School of Automation Science and Electrical Engineering Science and Technology on Aircraft Control Laboratory BUAA

The traditional control strategy of hydraulic flight motion simulator(HFMS) cannot meet the high tracking performance requirement, and the control precision is sensitive to disturbance. This paper presents an adaptive inverse controller based on the Wiener-type recurrent neural network(WRNN) to deal with the parametric uncertainties and uncertain nonlinearities in HFMS. The WRNN is a dynamic linear subsystem cascaded with a static nonlinear subsystem. The controller contains two WRNNs, one to identify the Jacobian information of the controlled plant and another to approximate the inverse model of the plant. Since the inverse transfer function behaves sensitive to the initial value, a feedback controller is designed. The input of the controlled plant includes the feedback controller output and the WRNN inverse controller output. Simulations have confirmed the effectiveness and superiority of the proposed WRNN adaptive inverse control strategy.

关键词： Wiener recurrent neural network adaptive control inverse control system identification

来源：评论

学校读者我要写书评

暂无评论

Active Fault Diagnosis in Sampled-data Systems

引用

IFAC-PapersOnLine 2015年第21期48卷 883-888页

作者： Niemann, Henrik Poulsen, Niels Kjolstad Department of Electrical Engineering Automation and Control Technical University of Denmark Building 326 DK-2800 Kgs. Lyngby Denmark Dept. of Applied Mathematics and Computer Science Section for Dynamical Systems Technical University of Denmark DK-2800 Kgs. Lyngby Denmark

The focus in this paper is on active fault diagnosis (AFD) in closed-loop sampleddata systems. Applying the same AFD architecture as for continuous-time systems does not directly result in the same set of closed-loop matrix transfer functions. For continuous-time systems, the LFT (linear fractional transformation) structure in the connection between the parametric faults and the matrix transfer function (also known as the fault signature matrix) applied for AFD is not directly preserved for sampled-data system. As a consequence of this, the AFD methods cannot directly be applied for sampled-data systems. Two methods are considered in this paper to handle the fault signature matrix for sampled-data systems such that standard AFD methods can be applied. The first method is based on a discretization of the system such that the LFT structure is preserved resulting in the same LFT structure in the fault signature matrix as obtained for continuous-time systems. The other method is an approximation method, where the same structure is obtained for small parametric faults. © 2015

关键词： Continuous time systems

来源：评论

学校读者我要写书评

暂无评论

Early pack-off diagnosis in drilling using an adaptive observer and statistical change detection 2

Early pack-off diagnosis in drilling using an adaptive obser...

引用

2nd IFAC Workshop on Automatic control in Offshore Oil and Gas Production, OOGP 2015

作者： Willersrud, Anders Imsland, Lars Blanke, Mogens Department of Engineering Cybernetics Norwegian University of Science and Technology TrondheimN-7491 Norway Automation and Control Group Department of Electrical Engineering Technical University of Denmark Kgs. LyngbyDK-2800 Denmark AMOS Centre of Excellence Department of Engineering Cybernetics Norwegian University of Science and Technology TrondheimN-7491 Norway

Pack-off is a partially or complete blocking of the circulation flow in oil and gas drilling, which can lead to costly delays. Early detection and localization of a pack-off is crucial in order to take necessary actions avoiding downtime. This incident will affect physical friction parameters in the well. A model-based adaptive observer is used to estimate these friction parameters as well as flow rates. Detecting changes to these estimates can then be used for pack-off diagnosis, which due to measurement noise is done using statistical change detection. Isolation of incident type and location is done using a multivariate generalized likelihood ratio test, determining the change direction of the estimated mean values. The method is tested on simulated data from the commercial high-fidelity multi-phase simulator OLGA, where three different pack-offs at different locations and with different magnitudes are successfully detected at an early stage and with low false alarms. © 2015, IFAG (International Federation of Automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Fault detection

来源：评论

学校读者我要写书评

暂无评论

MEMS based microswitch and microrelay

MEMS based microswitch and microrelay

引用

International Conference on Industrial Instrumentation and control (ICIC)

作者： R J Rajesh Siddharth Kaul Parth Maheta Sachin M C Control and Automation School of Electrical Engineering VIT University Vellore Tamil Nadu India Robotics and Control School of Electrical Engineering VIT University Vellore Tamil Nadu India

Today in market miniature devices are gaining extreme popularity. The use of MEMS based devices is seeing a rapid growth and finds applications in wide range of commercial and defense applications. MEMS switches may be of thin metal cantilever, air bridge, diaphragm or some other structure which is electrically configured either in series or parallel with RF transmission line. These switches are designed to open the line or shunt it to ground upon actuation. These switches have showed excellent RF characteristics which include insertion loss values of 0.1dB, isolation values of -30dB when switches are in series configuration at low RF frequencies (VHF to ~10GHz) and in switches of shunt configuration at higher frequencies (~10 to 100GHz). This type of response enables excellent performance in traditional RF circuits, capacitor banks and routing in RF system. It can also be said that RF MEMS enables a new class of antenna system which can be electrically reconfigured. In all these applications traditional switches can be replaced by RFMEMS switches. In this work, we have designed cantilever based MEMS switches and relay which operates at different voltages and for different dimensions. The design, modeling and simulation are done by FEM technique which is inbuilt in COMSOL. The tool used for this modeling is Comsol/Multiphysics.

关键词： Relays Micromechanical devices Contacts Solid modeling Microswitches Bridge circuits

来源：评论

学校读者我要写书评

暂无评论

Discrete Sliding Mode control for a Non-minimum Phase Electro-hydraulic Actuator System

Discrete Sliding Mode Control for a Non-minimum Phase Electr...

引用

Asian control Conference

作者： R. Ghazali Y. M. Sam M. F. Rahmat C. C. Soon H. I. Jaafar Zulfatman Center for Robotics and Industrial Automation Faculty of Electrical Engineering Universiti Teknikal Malaysia Melaka Department of Control and Mechatronics Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia

ISBN: (纸本)9781479978632

The main objective of this paper is to perform a robust controller design using discrete-time sliding mode control (DSMC). In the control scheme, two-degree-of-freedom (2-DOF) control strategy turns the DSMC, which generally utilized state feedback into output feedback controller. The designed control scheme is considered with feedback and feedforward combination by implementing the zero phase error tracking control (ZPETC), which particularly intended for the nonminimum phase electro-hydraulic actuator (EHA) system application. In the experimental works, a sinusoidal trajectory with different frequencies is employed to assess the DSMC performance under nonlinear and uncertain condition. Experimental results show the DMSC with perfect tracking control approach is capable to reduce the phase lag occurred due to nonlinear phenomenon. The proposed controller also is highly robust under various points of trajectories and significantly shows enhancement in tracking control performance as compared to the conventional controllers.

关键词： Output feedback control Discrete sliding mode control Zero-phase-error-tracking control Electro-hydraulic actuator system

来源：评论

学校读者我要写书评

暂无评论

Multi-source information fusion model in rule-based Gaussian-shaped fuzzy control inference system incorporating Gaussian density function

Multi-source information fusion model in rule-based Gaussian...

引用

作者： Li, Zairan He, Ting Cao, Luying Wu, Tunhua McCauley, Pamela Balas, Valentina E. Shi, Fuqian Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin China Wenzhou Vocational and Technical College Wenzhou China College of Information and Engineering Wenzhou Medical University Wenzhou325035 China Department of Industrial Engineering and Management Systems University of Central Florida OrlandoFL United States Department of Automation and Applied Informatics Aurel Vlaicu University of Arad Romania

An increasing number of applications require the integration of data from various disciplines, which leads to problems with the fusion of multi-source information. In this paper, a special information structure formalized in terms of three indices (the central presentation, population or scale, and density function) is proposed. Single and mixed Gaussian models are used for single source information and their fusion results, and a parameter estimation method is also introduced. Furthermore, fuzzy similarity computing is developed for solving the fuzzy implications under a Mamdani model and a Gaussian-shaped density function. Finally, an improved rule-based Gaussian-shaped fuzzy control inference system is proposed in combination with a nonlinear conjugate gradient and a Takagi-Sugeno (T-S) model, which demonstrated the effectiveness of the proposed method as compared to other fuzzy inference systems. © 2015 - IOS Press and the authors. All rights reserved.

关键词： Fuzzy control

来源：评论

学校读者我要写书评

暂无评论

Reduced-order observer and controller design for a 1000MW ultra-supercritical unit 58

Reduced-order observer and controller design for a 1000MW ul...

引用

58th ISA Power Industry Division Symposium 2015: Setting the Standard for automation, POWID 2015

作者： Su, Zhi-Gang Qian, Chunjiang Wang, Qian Wang, Zhao Department of Energy Information and Automation School of Energy and Environment Southeast University Nanjing Jiangsu China Department of Electrical and Computer Engineering University of Texas at San Antonio San AntonioTX United States College of Information and Control Engineering China University of Petroleum Qingdao Shandong China

ISBN: (纸本)9781510814981

Recently due to the increase in electric power generated by wind and its feeding into the power network, even 1000MW ultra-supercritical units are required to operate in variable load conditions. This puts forward higher requirement in controlling of 1000MW ultra-supercritical units. Unfortunately, the complexity of dynamic models of 1000MW ultra-supercritical units makes it difficult to design controllers for those units using existing popular control tools. In this paper, we focus on designing a reduced-order observer as well as an exponentially stable controller in order to enhance the control performance of the ultra-supercritical unit, comparing with a constant controller. The reduced-order observer is first designed to estimate the amount of coal coming into the boiler for combustion. As a matter of fact, such amount of coal plays an important role in controlling the unit and it is really challenging to measure the amount of coal due to the limitation of sensors and the complex working conditions of boiler. It reveals that the reduced-order observer can rapidly estimate the true amount of coal. Furthermore, an exponentially stable controller is constructed in a straightforward way. This exponentially stable controller takes the estimated amount of coal from the reduced-order observer into account sufficiently. The computer simulations are conducted and the results suggest that the performance of the unit can be enhanced under the exponentially stable controller compared to the constant controller. © 2015 by International Society of automation - ISA. All rights reserved.

关键词： controllers

来源：评论

学校读者我要写书评

暂无评论

Globally stabilizing state feedback control design for Lotka-Volterra systems based on underlying linear dynamics

Globally stabilizing state feedback control design for Lotka...

引用

作者： Magyar, Attila Hangos, Katalin M. Department of Electrical Engineering and Information Systems University of Pannonia Egyetem street 10. Veszprém H-8200 Hungary Process Control Research Group Control and Automation Research Institute HAS Kende street 13-17 BudapestH-1111 Hungary

Using translated X-factorable phase space transformations and nonlinear variable transformations a dynamically similar linear ODE model is associated to the Lotka-Volterra system models with a positive equilibrium point. This enables to use a linear full state feedback controller to stabilize the system in controllable cases, that leaves the open loop equilibrium point unchanged. The linear state feedback controller design problem in the general case has also been formulated to ensure the compartmental property of the closed loop system from which the existence of a diagonal Lyapunov function follows. Further extension has been obtained by using the time re-parametrization transformation defined for quasi-polynomial models. © 2015

关键词： Closed loop systems

来源：评论

学校读者我要写书评

暂无评论

Observer-Based Fault Tolerant Consensus of Linear Multi-Agent Systems

Observer-Based Fault Tolerant Consensus of Linear Multi-Agen...

引用

第27届中国控制与决策会议

作者： Zhiqiang Zuo Jun Zhang Yijing Wang Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and AutomationTianjin University

ISBN: (纸本)9781479970186

This paper considers the consensus problem of linear multi-agent systems with actuator *** communication topology is undirected ***,an observer is designed to estimate each agent's states and *** on the general faulty agent model and the observer's states,we then propose fault tolerant control protocol and the corresponding conditions to achieve ***,numerical examples are given to illustrate the theoretical results.

关键词： Observer-based protocol Multi-agent systems Consensus Actuator fault

来源：评论

学校读者我要写书评

暂无评论

A new design of the variable-pressure hydraulic pump

A new design of the variable-pressure hydraulic pump

引用

2015 International Conference on Fluid Power and Mechatronics

作者： Xiaoyan Su Zongxia Jiao Yuanzhi Xu School of automation science and electrical engineering Science and Technology on Aircraft Control Laboratory Beihang University

The conventional variable-pressure hydraulic pump can only work at two or three pressure levels. The outlet pressure is conducted to a piston changing the angle of the wash plate inside the pump by a control valve. A novel design proposed here makes the pump be capable of changing the pressure level continuously. The basic idea is adding a proportional solenoid into the control valve, and the stable pressure level can be determined by the input current rate. Some novel structures are designed to reduce the driving force upon the valve spool. The detailed mathematical model is established, and the dynamics of the system is carefully studied. Using the multi-disciplinary modeling and simulation, the effectiveness of the proposed design is validated and a good performance of changing pressure level is obtained.

关键词： hydraulic pump variable pressure servo control

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：