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Author: Eyad Abed Publisher: ISBN: Category : Languages : en Pages : 11
Book Description
Research was conducted in five main areas: (1) Nonlinear Dynamics of Compression Systems; (2) Synthesis of Robust Nonlinear Controllers; (3) Global Stability Analysis of Controllers; (4) Modeling Enhancements; and (5) Modal Participation and Instability Precursors. Results are described in the report along with the bibliography of published papers resulting from this grant.
Author: Eyad Abed Publisher: ISBN: Category : Languages : en Pages : 11
Book Description
Research was conducted in five main areas: (1) Nonlinear Dynamics of Compression Systems; (2) Synthesis of Robust Nonlinear Controllers; (3) Global Stability Analysis of Controllers; (4) Modeling Enhancements; and (5) Modal Participation and Instability Precursors. Results are described in the report along with the bibliography of published papers resulting from this grant.
Author: R. C. Pampreen Publisher: ISBN: Category : Technology & Engineering Languages : en Pages : 532
Book Description
High efficiency axial and centrifugal compressors are important in fields as diverse as aircraft engines, superchargers and turbochargers, process and refrigeration compressors. Compressors must achieve high efficiency in blade rows in diffusing flow fields. Of equal and sometimes greater importance is the range os stable operation of the compressor. Blade row stall characteristics determine the limit os stable operation. Blading can stall uniformly with symmetric flow breakdown or asymmetrically in rotating stall, wich propagates around the periphery of the blade row. Depending on aerodynamic conditions, surge may occur instead of, in concert with, or subsequent to blade row stall. The transient breakdown and recovery of aerodynamic loading not only limits compressor performance but also leads to mechanical failures caused by the vibrational loads imposed on the blades. There is no need to know what initiates these performance limits so that surge and stall margins can be optimized and control strategies can be planned. the first step toward understanding is to be knowledgeable about he physical processes occurring during surge and stall. This will permit the designer to anticipate variable geometry needs such as variable inlet guide vanes, variable statuors, and bleed port strategies. Theoritical treatment is far from being well established, however, there are many approaches discussed in the literature. This book is a unique reference to the subject matter. Physical descriptions of the phenomena are given, test results are presented, and analytical studies are discussed. There has been much written about the experimental investigations and theoretical treatments related to surge and stall. To assist those who would pursue advancements in furthering ou knowledge of surge and stall, it seemed appropriate to have a resource that contains a compendium of information on this subject. That is the purpose of this book. [Source : d'après la 4e de couverture].
Author: Jan Tommy Gravdahl Publisher: Springer Science & Business Media ISBN: 1447108272 Category : Technology & Engineering Languages : en Pages : 233
Book Description
The series Advances in Industrial Control aims to report and encourage technology transfer in control engineering. The rapid development of control technology impacts all areas of the control discipline. New theory, new controllers, actuators, sensors, new industrial processes, computer methods, new applications, new philosophies . . . , new challenges. Much of this development work resides in industrial reports, feasibility study papers and the reports of advanced collaborative projects. The series offers an opportunity for researchers to present an extended exposition of such new work in all aspects of industrial control for wider and rapid dissemination. Operating plant as close as possible to constraint boundaries so often brings economic benefits in industrial process control. This is the conundrum at the heart of this monograph by Tommy Gravdahl and Olav Egeland on stall control for compressors. Operation of the compressor closer to the surge line can increase operational efficiency and flexibility The approach taken by the authors follows the modern control system paradigm: -physical understanding, detailed modelling and simulation studies and finally control studies. The thoroughness of the presentation, bibliography and appendices indicates that the volume has all the hallmarks of being a classic for its subject. Despite the monograph's narrow technical content, the techniques and insights presented should appeal to the wider industrial control community as well as the gas turbine/compressor specialist. M. J. Grimble and M. A.
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This is the final report for AFOSR Grant Number F49620-96-1-0161, Active Control of Surge and Stall in Axial Flow Compressors. The research effort under this grant focused on combined monitoring and control of stall phenomena in axial flow compressors. The cognizant AFOSR Program Manager for the grant was Dr. Marc Jacobs, of the Directorate of Mathematical and Information Sciences and Computational Mathematics. The Principal Investigator on the grant was Dr. Eyad Abed, a Professor in the Department of Electrical and Computer Engineering who holds a joint appointment with the Institute for Systems Research. The technical report begins with a summary of the main goals of the project. Next, the main achievements are discussed. The remainder of the technical report gives information including personnel supported under the grant, publications benefiting from the grant, interactions and transitions, and honors and awards received by the co-Pis during the term of the grant.
Author: Publisher: ISBN: Category : Languages : en Pages : 19
Book Description
Modeling and control for axial flow compression systems have received great attention in recent years. The objectives are to suppress rotating stall and surge, to extend the stable operating range of the compressor system, and/or to enlarge domains of attraction of stable equilibria using feedback control methods. The success of this research field will significantly improve compressor efficiency and thus future aeroengine performance. This paper surveys the research literature and summarizes the major developments in this active research field, focusing on the modeling and control perspectives for rotating stall and surge in axial flow compressors.
Author: Se Young Yoon Publisher: Springer Science & Business Media ISBN: 1447142403 Category : Technology & Engineering Languages : en Pages : 292
Book Description
Surge Control of Active-magnetic-bearing-suspended Centrifugal Compressors sets out the fundamentals of integrating active magnetic bearing (AMB) rotor suspension technology in compressor systems, and describes how this relatively new bearing technology can be employed in active control of compressor surge initiation. The authors provide a self-contained and comprehensive review of rotordynamics and the fundamentals of AMB technology. The active stabilization of compressor surge employing AMBs in a machine is fully explored, from modeling of instability and controller design, to the implementation and experimental testing of the control algorithm in a specially-constructed, industrial-size centrifugal compression system. The results of these tests demonstrate the great potential of the new surge control method suggested in this text. This book will be useful for engineers in industries that involve turbocompressors and magnetic bearings, as well as for researchers and graduate students in the field of applied control. Whatever their level of experience, engineers working in the fields of turbomachinery, magnetic bearings, rotordynamics and controls will find the material in this book absorbing as all these important aspects of engineering are integrated to create a multi-disciplinary solution to a real-life industrial problem and the book is a suitable introduction to the area for newcomers.
Author: Geoff Sheard Publisher: ISBN: Category : Actuators Languages : en Pages : 0
Book Description
This paper discusses the mechanics of surge as observed on the high-speed axial compressors of modern aero-engines. It argues that the initial stage of the instability consists of a high-amplitude blast wave that develops nonlinearly from a small-scale disturbance and is thus not correctly described by traditional small perturbation stability theories. It follows from this that active control schemes of the global type may be inappropriate, since to be effective, control would have to be applied in a short time and in a very detailed manner, requiring a large number of transducers and actuators. Active control may, though, be effective in controlling the disturbances that grow into the above blast wave and in the control of other phenomena such as rotating stall, given an adequate number of transducers.
Author: Eyad Abed
Author: Eyad Abed
Author: R. C. Pampreen
Author: Jan Tommy Gravdahl
Author: 
Author: 
Author: Se Young Yoon
Author: Harald Jürgen Weigl
Author: Shengfang Liao
Author: Geoff Sheard
Author: John Michael Sebghati