检索结果-内蒙古大学图书馆

Signal Processing Algorithms, Architectures, Arrangements and Applications (SPA)

作者： Tomasz Marciniak Radosław Weychan Szymon Drgas Adam Dąbrowski Agnieszka Krzykowska Chair of Control and System Engineering Division of Signal Processing and Electronic Systems Poznań University of Technology Poznan Poland

This paper presents results of speaker recognition experiments using short Polish sentences. We developed and analyzed various vector quantization representations in order to first maximize identification effectiveness and second to compare VQ (vector quantization) and GMM (Gaussian mixture model) approaches. For the research and experiments we created and exploited database, containing specially prepared short speech sequences.

关键词： Speech recognition Image recognition Testing Speech coding Training Quantization Speech

来源：评论

学校读者我要写书评

暂无评论

Database of emergency telephone calls - system tools for real-time registration and metadata searching

Database of emergency telephone calls - system tools for rea...

引用

Signal Processing Algorithms, Architectures, Arrangements and Applications (SPA)

作者： Julian Balcerek Szymon Drgas Maciej Kmieciak Paweł Pawlowski Adam Konieczka Adam Dąbrowski Chair of Control and System Engineering Division of Signal Processing and Electronic Systems Poznań University of Technology Poznan Poland

This paper reports results of experiments carried out in relation with the research devoted to creation and maintenance of a database of telephone calls to emergency services. This database is comprised of concise but unambiguous information about all contained emergency calls and of tools for efficient data searching. We present the tools for real-time data registration, off-line metadata preparation, and searching of particular telephone calls. The environment setup, the database architecture, and proper equipment are also described.

关键词： Correlation Manuals Silicon Servers

来源：评论

学校读者我要写书评

暂无评论

Experimental results on sliding mode control of hoisting crane subject to state constraints

Experimental results on sliding mode control of hoisting cra...

引用

IEEE Region 8 International Conference on Computational Technologies in Electrical and Electronics Engineering, SIBIRCON

作者： A. Nowacka-Leverton D. Pazderskit M. Michałek A. Bartoszewicz Technical University of Łódź Institute of Automatic Control Łódź Poland Politechnika Poznanska Poznan PL Poznań University of Technology Chair of Control and Systems Engineering Poznań Poland

In this paper sliding mode control (SMC) of a hoisting crane is considered. The proposed control method employs a time-varying switching line which moves with a constant velocity and a constant angle of inclination to the origin of the error state space. Then, it stops moving and remains fixed. Since at the initial time the line consists of these points in the error state space which represent initial conditions of the system, the reaching phase is eliminated. As a consequence, the considered system is insensitive with respect to external disturbance and model uncertainty from the very beginning of the control action. Furthermore, the proposed method ensures the monotonic error convergence to zero and it guarantees the minimization of the integral of the time multiplied by the absolute error (ITAE) with acceleration and velocity constraints. The proposed control method is verified with two experimental tests for the laboratory model of industrial crane. The experimental results presented in the paper confirm that practical application of the proposed SMC strategy gives favourable dynamic performance of the system and ensures its good robustness.

关键词： Switches Cranes Mathematical model Acceleration Equations Payloads

来源：评论

学校读者我要写书评

暂无评论

XML-based Web service generation for microcontroller-based sensor actor networks

XML-based Web service generation for microcontroller-based s...

引用

IEEE International Workshop on Factory Communication systems (WFCS)

作者： Sebastian Käbisch Daniel Peintner Jörg Heuer Harald Kosch Chair of Distributed Information Systems University of Passau Passau Germany Siemens AG Corporate Technology Communication Systems & Control Networks Munich Germany University of Passau Chair of Distributed Information Systems Passau Germany

The development of applications for embedded sensor actor networks involves two major challenges: one of them is the communication between a diversity of widespread resource constraint nodes. The other one is the infrastructure dynamics. Web service based Service Oriented Architecture (SOA) would perfectly meet such unique characteristics of embedded networks and ease the development of applications. Standardized Web services, however, process usually plain XML messages which are not suitable for small embedded devices with very limited resources due to XML's verbosity, its bandwidth usage, and its associated processing overhead. The paper addresses these issues and describes an innovative source code generation technique by means of W3C's Efficient XML Interchange (EXI) format for developing XML-based Web services for microcontrollers. This offers developers a seamless use of the wide-spreadWeb service protocols in the embedded domain. First evaluation results prove the applicability of the generated XML-basedWeb services on microcontroller-based devices.

关键词： Web services XML Microcontrollers Simple object access protocol Service oriented architecture Hardware Random access memory Sensor systems and applications Communications technology Communication system control

来源：评论

学校读者我要写书评

暂无评论

Service-orientation on behalf of self-configuration for the automation environment

Service-orientation on behalf of self-configuration for the ...

引用

Annual Conference of Industrial Electronics Society

作者： Henning Mersch Ulrich Epple Christian Kleegrewe Chair for Process Control Engineering RWTH Aachen University Aachen Germany Corporate Technology Intelligent Autonomous Systems Siemens AG Munich Germany

On current automation systems a device failure might lead to significant down times of a plant as well as man power to replace and - more important - to setup the replacement device. Since the physical replacement can't be circumvented, the setup procedure could be automatized as much as possible. This paper shows an approach based on a new automation system designed as a service-oriented architecture (SOA). Advantages of this service-orientation for the automation environment are described in detail. The presented choreography of services yields to a flexible, dynamic and scalable system like it is well known for today's distributed, information technology systems - e.g. grid computing. This approach is applied to the self-configuration scenario as a demonstration of the benefits and chances, which could be achieved by modeling automation systems based on the SOA principle. A prototype realizes the presented service-choreography using real-world's automation components.

关键词： Automation Service oriented architecture Prototypes Sensors Valves Memory

来源：评论

学校读者我要写书评

暂无评论

A novel approach to the Model Reference Adaptive control of MIMO systems

A novel approach to the Model Reference Adaptive Control of ...

引用

IEEE International Workshop on Robotics in Alpe-Adria-Danube Region (RAAD)

作者： J.K. Tar I.J. Rudas J.F. Bitó K.R. Kozłowski C. Pozna John von Neumann Faculty of Informatics buda University Budapest Hungary Chair of Control and Systems Engineering Poznan University of Technology Poznan Poland Design and Robotics Department University Transilvania of Brasov Brasov Romania

The “Model Reference Adaptive control (MRAC)” is a popular approach from the early nineties to our days. Its basic idea is the application of proper feedback that makes the behavior of the controlled system identical to that of the “reference model” that normally is simple enough to control. The idea has many particular variants with the common feature that they are designed by the use of Lyapunov's 2 nd (“direct”) method that normally applies a quadratic Lyapunov function constructed of the tracking error and further additional terms. Though this approach normally guarantees global asymptotic stability, its use can entail complicated tuning that may have disadvantages whenever very fast applications are needed. In this paper an alternative problem tackling, the application of “Robust Fixed Point Transformations (RFPT)” in the MRAC technique is recommended. This approach applies strongly saturated, multiplicative nonlinear terms causing a kind of “deformation” of the input of the available imprecise system model. Instead parameter tuning that is typical in the traditional MRAC it operates with a simple convergence guaranteed only within a local basin of attraction. This technique can well compensate the simultaneous consequences of modeling errors and external disturbances that normally can “fob” the more traditional, tuning based approaches. As a potential application paradigm the novel MRAC control of a “cart - beam - hamper” system is considered. The conclusions of the paper are illustrated by simulation results.

关键词： Adaptive control MIMO Lyapunov method Motion control Programmable control Intelligent robots systems engineering and theory control systems control system synthesis Asymptotic stability

来源：评论

学校读者我要写书评

暂无评论

Dynamic stability and control design of modern electric energy systems with large penetration of distributed generators

Dynamic stability and control design of modern electric ener...

引用

iREP Symposium on Bulk Power System Dynamics and control

作者： M. Honarvar Nazari M. Ilić J. Peças Lopes Electrical Engineering K.N. Toosi University of Technology Iran Energy Systems Engineering Sharif University of Technology Iran Carnegie Mellon University Pittsburgh PA USA Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA University of Illinois Urbana-Champaign USA Control of Future Electricity Network Operations in the Faculty of Technology Delft University of Technnology Delft Netherlands Cornell University Ithaca NY USA Department of Electrical Engineering of the Faculty of Engineering of University of Porto Portugal

This paper investigates dynamic stability and control design of modern electric energy systems as many MW-scale distributed generators (DG) of various types are deployed in the distribution side of electric systems. The paper is mainly concerned about small-signal frequency stability of distribution systems with decentralized or centralized control systems. The Gerschgorin Circle Theory and Hicks Stability Theory are used for verifying sufficient conditions for small-signal stability. The paper also discusses about designing advanced enhancing robustness methods to ensure both safety and stability of modern distribution systems. Finally, the paper closes with a discussion of policies needed to support large penetration of DG units in distribution systems to ensure safety and robustness of the system.

关键词： Stability criteria Centralized control Power system stability Distributed control Frequency control Mathematical model

来源：评论

学校读者我要写书评

暂无评论

A nonlinear controller for rigid manipulators

引用

IFAC Proceedings Volumes 2009年第13期42卷 605-610页

作者： Przemyslaw Herman Chair of Control and Systems Engineering Poznan University of Technology Poznan Poland

Abstract A nonlinear controller for rigid manipulators is proposed in this paper. The controller is based on equations of motion arising from decomposition of the manipulator mass matrix and contains a vector of generalized velocity components (GVC). It is shown that dynamics description in terms of the GVC gives an further insight into the system dynamics which is also available if the presented controller is used. The theoretical considerations are illustrated by simulation on a 3 d.o.f. spatial manipulator.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Velocity tracking control algorithm in terms of quasi-velocities

引用

IFAC Proceedings Volumes 2009年第13期42卷 599-604页

作者： Przemyslaw Herman Krzysztof Kozlowski Chair of Control and Systems Engineering Poznan University of Technology Poznan Poland

Abstract In this paper a tracking controller expressed in terms of the quasi-velocities for rigid manipulators described by the Poincaré equations in a matrix form is proposed. The quasi-velocities introduced by Hurtado (2004) are based on Cholesky decomposition of the system inertia matrix. Using the proposed, exponentially convergent, controller it is possible to recognize some dynamic features of the system and at the same time to ensure the velocity control. It is shown that the presented approach can be helpful for reduction of nonlinearities existing in the manipulator in its design phase. The control strategy was tested in simulation on a 3 d.o.f. spatial manipulator.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Stabilization of the cart-pendulum system using normalized quasi-velocities

Stabilization of the cart-pendulum system using normalized q...

引用

Mediterranean Conference on control and Automation (MED)

作者： Przemyslaw Herman Chair of Control and Systems Engineering Poznan University of Technology Poznan Poland

A globally stabilizing controller in terms of the normalized quasi-velocities (NQV) for the cart-pendulum system is considered in this note. Introducing the NQV vector together with generalized coordinates leads to first-order differential equations with the identity mass matrix of the system. The proposed NQV controller, based on an energy approach, ensures balancing the inverted pendulum and bringing it to its upper equilibrium position. At the same time the cart displacement tends to zero. Some differences between the modified controller and the classical one given by Lozano et al. (2000) were discussed too.

关键词： control systems Automatic control Force control Matrix decomposition Automation systems engineering and theory Differential equations Laboratories Mechanical systems Motion 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：