Download or read book High Speed High Temperature Fault Tolerant Operation of a Combination Magnetic Hydrostatic Bearing Rotor Support System for Turbomachinery written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-21 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Closed loop operation of a single, high temperature magnetic radial bearing to 30,000 RPM (2.25 million DN) and 540 C (1000 F) is discussed. Also, high temperature, fault tolerant operation for the three axis system is examined. A novel, hydrostatic backup bearing system was employed to attain high speed, high temperature, lubrication free support of the entire rotor system. The hydrostatic bearings were made of a high lubricity material and acted as journal-type backup bearings. New, high temperature displacement sensors were successfully employed to monitor shaft position throughout the entire temperature range and are described in this paper. Control of the system was accomplished through a stand alone, high speed computer controller and it was used to run both the fault-tolerant PID and active vibration control algorithms. Jansen, Mark and Montague, Gerald and Provenza, Andrew and Palazzolo, Alan Glenn Research Center NASA/TM-2004-212952, ARL-TR-3156, GT2004-53321, NAS 1.15-212952, E-14391

Download or read book Proceedings of the ASME Turbo Expo written by and published by . This book was released on 2004 with total page 838 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design and Fabrication of High Temperature Radial Magnetic Bearing for Turbomachinery written by and published by . This book was released on 2003 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Motors, magnetic bearings, and other electromagnetic actuators that can operate at 1000 degrees F (540 degrees C) hold great promise for providing increased efficiency in machinery for many applications ranging from pebble-bed nuclear reactors and chemical processing to aircraft and unmanned aerial combat vehicle (UCAV) propulsion systems. This report discusses in detail the design and fabrication of a high-temperature, heteropolar, radial magnetic bearing that was operated at 1000 degrees F (540 degrees C). The development of high-temperature wire and a coil fabrication process are two significant technical barriers overcome by the Army Research Laboratory (ARL), the NASA Glenn Research Center, and the Texas A & M University (TAMU) team. This is ARL/NASA/TAMU's third-generation, high-temperature magnetic bearing. The motivation for this research came from the pursuit of a more electric gas turbine engine and a high-temperature, large-diameter, 4-million-DN (diam in millimeters times rotor speed in revolutions per minute) rotor support system. (5 tables, 16 figures, 9 refs.).

Download or read book Room Temperature Characterization of a Magnetic Bearing for Turbomachinery written by and published by . This book was released on 2002 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Open loop, experimental force and power measurements of a three-axis, radial, heteropolar magnetic bearing at room temperature for rotor speeds up to 20,000 RPM are presented in this paper. The bearing, NASA Glenn Research Center's and Texas A & M's third generation high temperature magnetic bearing, was designed to operate in a 1000 deg. F (540 deg. C) environment and was primarily optimized for maximum load capacity. The experimentally measured force produced by one C-core of this bearing was 630 lb. (2.8 kN) at 16 A, while a load of 650 lbs (2.89 kN) was predicted at 16 A using 1D circuit analysis. The maximum predicted radial load for one of the three axes is 1,440 lbs (6.41 kN) at room temperature. The maximum measured load of an axis was 1050 lbs. (4.73 kN). Results of test under rotating conditions showed that rotor speed has a negligible effect on the bearing's load capacity. A single C-core required approximately 70 W of power to generate 300 lb (1.34 kN) of magnetic force. The room temperature data presented was measured after three thermal cycles up to 1000 deg. F (540 deg. C), totaling six hours at elevated temperatures.

Download or read book Rotordynamic Instability Problems in High Performance Turbomachinery 1996 written by and published by . This book was released on 1997 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rotor and Structural Dynamics of Turbomachinery written by Raj Subbiah and published by Springer. This book was released on 2018-01-16 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides engineers and scientists with practical fundamentals for turbomachinery design. It presents a detailed analysis of existing procedures for the analysis of rotor and structure dynamics, while keeping mathematical equations to a minimum. Specific terminologies are used for rotors and structures, respectively, allowing the readers to clearly distinguish between the two. Further, the book describes the essential concepts needed to understand rotor failure modes due to lateral and torsional oscillations. It guides the reader from simple single-degree-of-freedom models to the most complex multi-degree-of-freedom systems, and provides useful information concerning steel pedestal stiffness degradation and other structural issues. Fluid-film bearing types and their dynamical behavior are extensively covered and discussed in the context of various turbomachinery applications. The book also discusses shaft alignment and rotor balancing from a practical point of view, providing readers with essential information to help them solve practical problems. As the main body of the book focuses on the diagnostics and description of case studies addressing the most pressing practical issues, together with their successful solutions, it offers a valuable reference guide, helping field engineers manage day-to-day issues with turbomachinery.

Download or read book Balancing of High Speed Machinery written by Mark S. Darlow and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern rotating machinery, particularly turbomachinery, is frequently being designed to operate at higher speeds than in the past. Consequently, there is an increased need to balance high-speed rotors. The purpose of this book is to provide the engineering student or practicing engineer with a single, complete reference on high-speed rotor balancing. To this end, a detailed analytical background and practical application procedures are presented for each of the principal high-speed rotor balancing methods, i.e. modal balancing, influence coefficient balancing and the Unified Balancing Approach. This information is supplemented and supported through a presentation of the theoretical development of synchronous rotor vibration and a brief overview of rigid rotor balancing techniques and machines. This is the first time this material is available in a single, concise volume, together with detailed descriptions of application procedures.

Download or read book Magnetic Bearings for Assist Devices written by Stephen Day and published by Momentum Press. This book was released on 2015-12-16 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces magnetic bearings--mechatronic devices that produce contact-free electromagnetic force to support a load, such as a moving train or a spinning rotor. Compared to traditional bearings, magnetic bearings offer several advantages: no friction, low heat generation, no required lubrication, quiet operation, and fast and stable rotation. For these reasons, magnetic bearings have been used in rotary ventricular assist devices (VADs) to increase design life, reduce or eliminate material wear and bearing maintenance, as well as to increase biocompatibility by eliminating high fluid stresses and heat generation, both of which are associated with hemolysis, platelet activation and aggregation, and thrombus growth. The book covers the principles of these bearings, how they are used in integrated control and electronics systems, and useful information on several major brands of current assist devices.

Download or read book Magnetic Bearings written by Gerhard Schweitzer and published by Springer Science & Business Media. This book was released on 2009-06-10 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compiling the expertise of nine pioneers of the field, Magnetic Bearings - Theory, Design, and Application to Rotating Machinery offers an encyclopedic study of this rapidly emerging field with a balanced blend of commercial and academic perspectives. Every element of the technology is examined in detail, beginning at the component level and proceeding through a thorough exposition of the design and performance of these systems. The book is organized in a logical fashion, starting with an overview of the technology and a survey of the range of applications. A background chapter then explains the central concepts of active magnetic bearings while avoiding a morass of technical details. From here, the reader continues to a meticulous, state-of-the-art exposition of the component technologies and the manner in which they are assembled to form the AMB/rotor system. These system models and performance objectives are then tied together through extensive discussions of control methods for both rigid and flexible rotors, including consideration of the problem of system dynamics identification. Supporting this, the issues of system reliability and fault management are discussed from several useful and complementary perspectives. At the end of the book, numerous special concepts and systems, including micro-scale bearings, self-bearing motors, and self-sensing bearings, are put forth as promising directions for new research and development. Newcomers to the field will find the material highly accessible while veteran practitioners will be impressed by the level of technical detail that emerges from a combination of sophisticated analysis and insights gleaned from many collective years of practical experience. An exhaustive, self-contained text on active magnetic bearing technology, this book should be a core reference for anyone seeking to understand or develop systems using magnetic bearings.

Download or read book Experimental High Temperature Characterization of a Magnetic Bearing for Turbomachinery written by and published by . This book was released on 2003 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Open loop, experimental force and power measurements of a radial, redundant-axis, magnetic bearing at temperatures to 1000 degrees F (538 degrees C) and rotor speeds to 15,000 RPM along with theoretical temperature and force models are presented in this paper. The experimentally measured force produced by a single C-core using 22A was 600 pounds (2.67 kN) at room temperature and 380 pounds (1.69 kN) at 1000 degrees F (538 degrees C). These values were compared with force predictions based on a 1D magnetic circuit analysis and a thermal analysis of gap growth as a function of temperature. Tests under rotating conditions showed that rotor speed has a negligible effect on the bearing's load capacity. One C-core required approximately 340 watts of power to generate 190 pounds (8.45 kN) of magnetic force at 1000 degrees F (538 degrees C). However, the magnetic air gap was much larger than at room temperature. The data presented is after the bearing had already operated 6 thermal cycles and 11 total (not consecutive) hours at 1000 degrees F (538 degrees C). (23 figures, 9 refs.).

Download or read book Fault Tolerant Control of Rotor magnetic Bearing Systems written by Matthew Owen Thomas Cole and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rotordynamic Enhancement by Utilizing the Controlled Hydrostatic Injection of Hybrid Air Foil Bearing written by Behzad Zamanian Yazdi and published by . This book was released on 2019 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Air foil bearings (AFBs) are introduced as promising bearings for oil-free turbomachinery applications. Air foil bearing (AFB) technology has made substantial advancement during the past decades and found its applications in various small turbo machinery. AFBs provide reliable operation at high speed and high temperature with negligible power loss. However, rotordynamic instability, friction and drag during the start/stop, and thermal management are still challenges for further application of the technology. Hybrid Air Foil Bearing (HAFB) technology utilizes the radial injection of externally pressurized air into the traditional hydrodynamic AFB's film thickness through orifices attached to the top foil. HAFB is one of the technology advancements to the conventional AFB. Previous studies on HAFBs demonstrate the enhancement in the load capacity at low speeds, reduction or elimination of the friction and wear during starts/stops, better heat dissipation capability, and enhancement in rotordynamic stability. This dissertation is dedicated to explore the benefit of the HAFB to enhance the rotordynamic stability by employing a controlled hydrostatic injection. Moreover, this dissertation investigates the effect of circumferential location of radial injection on therotordynamic performance of HAFB. Analytical and experimental evaluations of the rotordynamic performance of a rotor supported by two HAFBs with the controlled hydrostatic injection, which utilizes the injections at particular locations to control eccentricity and attitude angle are presented. To investigate the effect of circumferential location of orifices, parametric studies are conducted using three sets of single-pad HAFBs. The circumferential locations of orificesare different for each set. The presented simulation analyses consist of time-domain orbit simulation and frequency-domain modal analysis. The simulations in both time-domain orbit simulations and frequency-domain modal analyses indicate a substantial improvement of the rotorbearing performance. The simulation results were verified in a high speed test rig(maximum speed of 70,000 rpm). Both simulations and experiments clearly demonstrate the effectiveness of the controlled hydrostatic injection on improving the rotordynamic performance of AFB. Imbalance responses of rotor-HAFB were measured with various orifice locations and the results agree well with predictions. Comparison of the rotordynamic performance of HAFBs with different orifice configurations demonstrate substantial improvement in rotordynamic stability as well as enhancement in the stiffness and damping coefficients of HAFBs by choosing the best circumferential location for radial injection to control rotor eccentricity and attitude angle.

Download or read book Magnetic Bearings written by Gerhard Schweitzer and published by Springer. This book was released on 2009-06-05 with total page 535 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compiling the expertise of nine pioneers of the field, Magnetic Bearings - Theory, Design, and Application to Rotating Machinery offers an encyclopedic study of this rapidly emerging field with a balanced blend of commercial and academic perspectives. Every element of the technology is examined in detail, beginning at the component level and proceeding through a thorough exposition of the design and performance of these systems. The book is organized in a logical fashion, starting with an overview of the technology and a survey of the range of applications. A background chapter then explains the central concepts of active magnetic bearings while avoiding a morass of technical details. From here, the reader continues to a meticulous, state-of-the-art exposition of the component technologies and the manner in which they are assembled to form the AMB/rotor system. These system models and performance objectives are then tied together through extensive discussions of control methods for both rigid and flexible rotors, including consideration of the problem of system dynamics identification. Supporting this, the issues of system reliability and fault management are discussed from several useful and complementary perspectives. At the end of the book, numerous special concepts and systems, including micro-scale bearings, self-bearing motors, and self-sensing bearings, are put forth as promising directions for new research and development. Newcomers to the field will find the material highly accessible while veteran practitioners will be impressed by the level of technical detail that emerges from a combination of sophisticated analysis and insights gleaned from many collective years of practical experience. An exhaustive, self-contained text on active magnetic bearing technology, this book should be a core reference for anyone seeking to understand or develop systems using magnetic bearings.

Download or read book Fault Tolerant Homopolar Magnetic Bearings written by and published by . This book was released on 2003 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Magnetic Bearings and Bearingless Drives written by Akira Chiba and published by Elsevier. This book was released on 2005-05-20 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of bearingless drives is emerging as an important technique in the areas of high-speed machinery and motion-control, and this book aims to provide a thorough grounding in the principles behind this cutting-edge technology. Basic principles are described in detail with practical examples to aid understanding, and the different types of bearingless drives are introduced, along with coverage of test machines and applications. Aimed at practising electrical and mechanical engineers and advanced students, Magnetic Bearings and Bearingless Drives provides an essential guide to an area of engineering previously only fully covered by large numbers of academic papers. · Unique and comprehensive coverage of a cutting-edge subject for electrical and mechanical engineers · A reference text and survey for designers, manufacturers and users of high-speed motors, generators and electrical drive systems · Examines the basic principles behind magnetic bearings, with key technologies and applications illustrated through examples and case studies

Download or read book Rotordynamic instability problems in high performance turbomachinery 1988 written by and published by . This book was released on 1989 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Rotordynamic Instability Problems in High performance Turbomachinery written by and published by . This book was released on 1980 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: