检索结果-内蒙古大学图书馆

Adaptive High-degree Cubature Kalman Filter with unknown noise statistics

Journal of Information and Computational Science 2014年第18期11卷 6703-6712页

作者： Shi, Yuepeng Che, Lei Ge, Quanbo Zhou, Xizhao School of Economics and Management Shanghai Maritime University Shanghai China Department of Information Engineering Henan University of Animal Husbandry and Economy Zhengzhou China School of Information Management Beijing Information Science and Technology University Beijing China Institute of System Science and Control Engineering School of Automation Hangzhou Dianzi University Hangzhou China

This paper is concerned with the state estimation problem for nonlinear systems with unknown covariance of process noise. The advantages of recently developed High-degree Cubature Kalman Filter (HCKF) are significant with its easy to implement and better estimation accuracy. However, it has bad robustness on modeling uncertainty for practical applications. To overcome the limitations of the HCKF, an Adaptive HCKF (AHCKF) is proposed by combing strong tracking filtering and Sage-Husa estimator. In the proposed state estimator, a fading factor is used to correct one state prediction covariance while the Sage-Husa estimator is adopted to recursively estimate the unknown process noise statistics. Therefore, the AHCKF can obtain better robustness and accuracy comparing with the conventional HCKF. Simulation examples on target tracking are demonstrated the validity of the proposed algorithms.

关键词： Adaptive filtering

来源：评论

学校读者我要写书评

暂无评论

Phase angle adjustment for phase advance control of brushless DC motor

Phase angle adjustment for phase advance control of brushles...

引用

International Conference on Intelligent and Advanced systems, ICIAS

作者： Mohd Syafiq bin Mohd Mohd Noh bin Karsiti Mohd Syaifuddin bin Mohd Automation and Control System Cluster / MOR Energy Department of Electrical Engineering UniversitiTeknologi PETRONAS Malaysia Automation and Control System Cluster/MOR Energy UniversitiTeknologi PETRONAS

Brushless direct current (BLDC) motor is widely used in small and medium side electric vehicles as it exhibit highest specific power and thermal efficiency compared with induction motor. The permanent magnets in the rotor create a constant magnetic flux, which limit the motor top speed. As the back electromotive force (EMF) voltage increases proportionally with motor rotational speed and it approaches the amplitude of the input voltage, the phase current amplitude will reach zero. By advancing the phase current, it is possible to extend the maximum speed of the BLDC motor beyond the rated top speed. This will allow smaller BLDC motor to be used in small electric vehicles and in larger applications will allow the use of BLDC motor without the use of multispeed transmission unit for high speed operation. Adjusting the phase angle will affect the speed of the motor as the each coil is energized earlier than the corresponding rise in back emf of the coil. Preliminary test results indicated that the motor top speed can be increased at least by 40 percent over the baseline speed at no load condition.

关键词： Permanent magnet motors Induction motors Torque Mathematical model Brushless DC motors

来源：评论

学校读者我要写书评

暂无评论

Identification and quantification of hazards caused by uncontained engine rotor failure 9

Identification and quantification of hazards caused by uncon...

引用

2014 9th International Symposium on Safety Science and Technology, ISSST 2014

作者： Li, Mailiang Sun, Zhiqiang Gong, Erling System Analysis Institute Air Force Armament Research Academy Beijing100076 China Department of Automatic Control College of Mechatronic Engineering and Automation National University of Defense Technology Changsha410073 China

ISBN: (纸本)9781634396882

One approach based on AC20-128A is presented in order to assess the risk caused by uncontained engine rotor failure (UERF). In this approach, the risk assessment procedure includes hazard identification and hazard quantification. In the step of hazard identification, the catastrophic functional hazards, derived from the functional hazard analysis (FHA) results for the airplane, are used as the top events to construct the fault trees. The minimal cut sets (MSCs) of the fault trees are the hazards to be identified exactly. In the step of hazard quantification, the probability of one hazard triggered by some uncontained debris is evaluated. After the probabilities of all the identified hazards are quantified, the risk assessment of the airplane is completed. And the assessment result is compared with the design specifications to show compliance with the safety design. A small example is introduced to illustrate the rationality and accuracy of the aforementioned method. © 2014 The Authors. Published by Elsevier Ltd.

关键词： Risk assessment

来源：评论

学校读者我要写书评

暂无评论

Vertical Channel Damping Loop Design using Vertical Position and Velocity Information

Vertical Channel Damping Loop Design using Vertical Position...

引用

International Conference on control, automation and systems

作者： Tok Son Choe Won Sang Ra Jin Bae Park Kwanghoon Kim Myonghwan Ahn Department of Electrical and Electronic Engineering Yonsei University School of Mechanical and Control Engineering Handong Global University Combat System R&D Lab LIG Nex1 Co. Ltd.

ISBN: (纸本)9781479999767

In this paper, a vertical channel damping loop design using vertical position and velocity information is newly proposed. The inertial navigation system (INS) for the position, orientation, and velocity is mostly used for various platforms. The main disadvantage of the INS is that the navigation information degrade with time. Especially, the vertical channel error diverges exponentially if external sensors do not compensate it. The proposed method uses vertical position and velocity information acquired by additional sensors. The Kalman filter is constructed to calculate vertical channel damping loop gains. The proposed method is simulated by using INS and additional sensors error statistics. Results demonstrate the usefulness and practicality of the proposed method.

关键词： Inertial navigation system Vertical channel damping loop Vertical position and velocity

来源：评论

学校读者我要写书评

暂无评论

Spectrum leasing and relay selection in multiuser cooperative cognitive radio networks

引用

Journal of Communications 2014年第3期9卷 198-207页

作者： Tang, Yi Grace, David Wang, Lijie College of Electronic Science and Engineering National University of Defense Technology Hunan 410073 China Science and Technology on Information System Security Laboratory China Department of Electronics University of York York YO10 5DD United Kingdom Beijing Aerospace Control Center Beijing China

In this paper, we consider multiple primary and multiple secondary users cooperative cognitive radio networks, in which the primary users (PUs) lease a portion of their spectrum to the secondary users (SUs) for some revenue, and in return the SUs play as relays and help forward the data of the Pus in exchange for being granted spectrum opportunities. Both the PUs and SUs aim to maximize their own utilities. The spectrum leasing and relay selection problem is studied. We formulate the spectrum leasing problem as a Stackelberg game, and transform the relay selection problem as an assignment problem which is solved by the Hungarian method. Numerical results show that, under the proposed cooperative spectrum leasing-optimal-relay-selection scheme, both the primary and secondary network can achieve high utilities. © 2014 engineering and Technology Publishing.

关键词： Cognitive radio

来源：评论

学校读者我要写书评

暂无评论

Improving ℒ 2 Gain Performance of Linear systems by Reset control

引用

IFAC Proceedings Volumes 2014年第3期47卷 6400-6405页

作者： Guanglei Zhao Dragan Nesic Ying Tan Jingcheng Wang Department of Automation Shanghai JiaoTong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai 200240 China Department of Electrical and Electronic Engineering University of Melbourne Parkville 3010 VIC. Australia

In this paper, new Lyapunov-based reset rules are constructed to improve ℒ 2 gain performance of linear-time-invariant (LTI) systems. By using the hybrid system framework, sufficient conditions for exponential and finite gain ℒ 2 stability are presented. It is shown that the ℒ 2 gain of the closed loop system with resets can be improved compared with the base system. Numerical example supports our results.

关键词： Hybrid system Lyapunov-based reset rules ℒ 2 gain reset controller

来源：评论

学校读者我要写书评

暂无评论

An adaptive predictive control strategy for RMPPT under partially shaded conditions 19

An adaptive predictive control strategy for RMPPT under part...

引用

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

作者： Ma, Chao Wu, Jing Li, Ning Li, Shaoyuan Li, Kang Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai China School of Electronics Electrical Engineering and Computer Science Queen's University Belfast United Kingdom

ISBN: (纸本)9783902823625

As one of key technologies in photovoltaic converter control, Maximum Power Point Tracking (MPPT) methods can keep the power conversion efficiency as high as nearly 99% under the uniform solar irradiance condition. However, these methods may fail when shading conditions occur and the power loss can over as much as 70% due to the multiple maxima in I-P curve in shading conditions v.s. single maximum point in uniformly solar irradiance. In this paper, a Real Maximum Power Point Tracking (RMPPT) strategy under Partially Shaded Conditions (PSCs) is introduced to deal with this kind of problems. An optimization problem, based on a predictive model which will change adaptively with environment, is developed to tracking the global maxima and corresponding adaptive control strategy is presented. No additional circuits are required to obtain the environment uncertainties. Finally, simulations show the effectiveness of proposed method. © IFAC.

关键词： Adaptive control systems

来源：评论

学校读者我要写书评

暂无评论

A Combined Approach for Master-slave Robotic Surgery system control Based on Jacobian and PD Algorithm

A Combined Approach for Master-slave Robotic Surgery System ...

引用

2014 4th IEEE International Conference on Information Science and Technology

作者： Zhonglin Zhang Jing Xiong Yangzhou Gan Dongwen Zhang Zeyang Xia Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences School of Electronic Engineering and Automation Guilin University of Electronic Technology Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information ProcessingMinistry of Education of China

In this paper, a semi-physical simulation platform of robot teleoperation system is designed, and a combined control approach using Jacobian matrix and Proportional-Derivative(PD) algorithm is proposed. A digital low-pass filter is designed to eliminate noise signal caused by hand-vibration of surgeons. The advantages of the proposed approach include easy implementation, real-time response and accurate master-slave tracking. The results of semi-physical simulation validated that the proposed approach realized accurate master-slave tracking for puncture surgery and the noise caused by hand-vibration was eliminated effectively.

关键词： robotic puncture surgery teleoperation Jacobian matrix PD control algorithm vibration elimination

来源：评论

学校读者我要写书评

暂无评论

Integration of management services for remote/virtual laboratories

Integration of management services for remote/virtual labora...

引用

IEEE Global engineering Education Conference

作者： R. Pastor-Vargas Ll. Tobarra S. Ros R. Hernandez A. Caminero A. Robles M. Castro G. Diaz E. Sancristobal M. Tawfik Communications and Control System Department Spanish University for Distance Education Electrical Electronic and Control Engineering Department Spanish University for Distance Education

ISBN: (纸本)9781479931927

Development of virtual/remote laboratories is a common task involved in the design of course's assessments (in engineering disciplines). The deployment of these laboratories must manage several aspects related to the real use of them, as user's authorization and access, tracking of usage information, loading/saving data from experiments and so on. These features must be implemented by developers in a particular way for each laboratory. This paper shows how these services can be used automatically, with no development, using the RELATED management services. The deployment task consists of making a connector to the RELATED framework in order to consume these services. A full example is shown, describing the steps followed to integrate a previously developed low cost laboratory (based on a Lego system).

关键词： Component Management services Software integration Remote and virtual laboratories

来源：评论

学校读者我要写书评

暂无评论

Feedforward and Feedback control of Dynamic systems

引用

IFAC Proceedings Volumes 2014年第3期47卷 7741-7748页

作者： Wuhua Hu Eduardo F. Camacho Lihua Xie School of Electrical and Electronic Engineering Nanyang Technological University Singapore Department of System Engineering and Automatic Control Escuela Superior de Ingenieros of the University of Sevilla Spain

Recently the control methods based on disturbance rejection have largely renewed our understanding of automatic control, especially the role of feedforward control. With the renewed understanding, this work presents a feedforward and feedback approach for control of general dynamic systems under a state tracking framework. This is realized by introducing a fictitious system model and employing a proper state and disturbance estimator. The resultant control scheme embodies a close cooperation between feedforward and feedback controls: Feedforward control rejects the general disturbance and embeds a reference state trajectory, whilst feedback control cancels the fictitious dynamics and enforces desired tracking error dynamics. A notable advantage of the approach is that control designs of linear and nonlinear systems can follow a common routine and the closed-loop stability is guaranteed under standard conditions.

关键词： Linear systems nonlinear systems feedforward control feedback control disturbance estimation model-free control active disturbance rejection control uncertainty and disturbance estimator pendulum

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：