Imbalance Detection and Health Monitoring From Gain Variations in an Adaptive Disturbance Rejection Controller

2007 ◽  
Author(s):  
Kelly Barber ◽  
George T. Flowers ◽  
Alex Matras ◽  
Mark Balas ◽  
Jerry Fausz
Keyword(s):  
Health Monitoring ◽  
Disturbance Rejection ◽  
High Speed ◽  
Crack Detection ◽  
Adaptive Strategy ◽  
Magnetic Bearings ◽  
Test Rig ◽  
Rotor Systems ◽  
Common Technique ◽  
Insight Into

Health monitoring is of critical importance in maintaining the integrity of high-speed rotating machinery. In this paper, a health monitoring strategy based upon the acquisition and analysis of vibration measurements is described and evaluated. A common technique in this regard is to track changes in the synchronous vibration due to imbalance. However, such an approach must consider the controller strategy used with the magnetic bearings. Herein, a simulation model is developed that consists of a flywheel system supported by magnetic bearings, which are controlled using an adaptive strategy that suppresses synchronous vibration. The interaction between the rotor vibration and the controller responses are evaluated in order to provide insight into indicators of crack initiation and growth. The results and conclusions are also validated using an experimental test rig. Some insights and guidelines as to appropriate strategies for crack detection in rotor systems interacting with active bearing controllers is presented and discussed.

Influence of the electromagnetic gap in gas–magnetic bearings on the output characteristics of high-speed rotor systems

2016 ◽  
Vol 36 (3) ◽  
pp. 184-186
Author(s):  
A. V. Kosmynin ◽  
V. S. Shchetinin ◽  
A. S. Khvostikov ◽  
A. V. Smirnov ◽  
N. A. Ivanova
Keyword(s):  
High Speed ◽  
Magnetic Bearings ◽  
Rotor Systems ◽  
Output Characteristics ◽  
Electromagnetic Gap

Adaptive Synchronization Control Design for High-Speed Magnetic Bearings

1995 ◽  
Author(s):  
Li-Farn Yang ◽  
Jeen-Gwo Tsao
Keyword(s):  
Disturbance Rejection ◽  
High Speed ◽  
Feedforward Control ◽  
Rotating Disk ◽  
Rotor System ◽  
Magnetic Bearings ◽  
Adaptive Synchronization ◽  
Synchronization Control ◽  
Plant Variation ◽  
Adaptive Feedforward

Abstract The performance of actively controlled magnetic bearings is greatly degraded if subjected to unpredictable disturbances or system dynamic variations. This paper present an adaptive synchronization control on a magnetically suspended rotor system for disturbance rejection and plant variation compensation. The rotor system consists of a rotating disk mounted on a shaft which is actively positioned in the radial directions via two magnetic bearings at both ends. Under the synchronizing control, four displacements of shaft along bearing axes are coordinated such that the disturbed displacement can promptly be recovered with those undisturbed in a complementary way. Such motion synchronization requires strict regulation and adaptation through four local controllers with an adaptive feedforward control scheme. The local controllers can be linked by the coupling law, in which an error along one bearing axis can affect overall control loop of four axes. Two control algorithms are developed under the biaxial and quadaxial synchronization conditions, and their adaptation laws are optimized in an attempt to minimize the adaptation errors. Simulations of disturbance rejection responses will also be presented.

Magnetic Bearings for Non-Destructive Health Monitoring of Rotating Machinery Supported in Conventional Bearings

2005 ◽  
Vol 293-294 ◽  
pp. 383-390 ◽  
Author(s):  
M. Kasarda ◽  
D.D. Quinn ◽  
T. Bash ◽  
G. Mani ◽  
Daniel J. Inman ◽  
...  
Keyword(s):  
Health Monitoring ◽  
Magnetic Bearings ◽  
Active Magnetic Bearings ◽  
Test Rig ◽  
Rotating System ◽  
Input Signals ◽  
On Line ◽  
Rotating Structure ◽  
Non Destructive ◽  
Initial Results

This paper describes initial results from a project expanding the field of rotor health monitoring by using Active Magnetic Bearings (AMBs) as actuators for applying a variety of known force inputs to a spinning rotor in order to monitor and evaluate response signals resulting from these inputs on-line. Similar to modal analysis and other nondestructive evaluation (NDE) techniques which apply input signals to static structures in order to monitor responses; this approach allows for the measurement of both input and output response in a rotating system for evaluation. However, unlike these techniques, the new procedure allows for multiple forms of force input signals to be applied to a rotating structure. This technique is being developed for use on rotating equipment supported in conventional bearings where an AMB actuator is added to a system for improved health monitoring. This paper presents initial results from this project including a demonstration of the system identification capability of the procedure during the commissioning of a test rig, and a summary of a technique developed for identifying breathing-cracks in rotors using the new technique.

Gas–magnetic bearings in high-speed rotor systems

2017 ◽  
Vol 37 (8) ◽  
pp. 679-681
Author(s):  
V. S. Shchetinin ◽  
A. V. Kosmynin ◽  
A. S. Khvostikov ◽  
A. V. Smirnov ◽  
N. A. Ivanova
Keyword(s):  
High Speed ◽  
Magnetic Bearings ◽  
Rotor Systems

Modeling of a High Speed Rotor Test Rig With Active Magnetic Bearings

2005 ◽  
Vol 128 (3) ◽  
pp. 269-281 ◽  
Author(s):  
Guoxin Li ◽  
Zongli Lin ◽  
Paul E. Allaire ◽  
Jihao Luo
Keyword(s):  
Experimental Data ◽  
High Speed ◽  
Model Updating ◽  
Magnetic Bearing ◽  
Magnetic Bearings ◽  
Behavior Modeling ◽  
Analytical Models ◽  
System Component ◽  
Test Rig ◽  
Experimental Identification

This paper reports on the modeling and experimental identification of a high speed rotor-magnetic bearing test rig. An accurate nominal model and an uncertainty representation are developed for robust controller synthesis and analysis. A combination of analytical modeling, model updating, and identification is employed for each system component and for the system as a whole. This approach takes advantage of both the behavior modeling and input/output modeling methods. Analytical models of the rotor and the magnetic bearings are first developed from physical laws and refined by comparison with the experimental data. The substructure model is directly identified from the experimental data by a structured identification approach. Models of the electronic systems, such as the filters, amplifiers, sensors, and digital controller, are developed through experimental identification. These component models are then assembled to obtain the overall system model. Closed-loop tests are conducted to identify parameters in the model. Advanced control techniques based on H∞ control and μ synthesis are developed and successfully implemented on the test rig, which further validates the model.

scholarly journals A 35,000 RPM Test Rig for Magnetic, Hybrid and Back-Up Bearings

1999 ◽  
Author(s):  
Erik E. Swanson ◽  
James F. Walton ◽  
Hooshang Heshmat
Keyword(s):  
High Speed ◽  
Magnetic Bearings ◽  
Active Magnetic Bearings ◽  
Test Rig ◽  
Low Loss ◽  
Dynamic Motion ◽  
Speed Test ◽  
Bearing Loads ◽  
Amb System ◽  
Overload Capacity

Magnetic bearings have long offered the potential for significant turbomachinery system improvements due to their oil-free, non-contact, low loss nature and their ability to actively control shaft dynamic motion. However, end-users and many designers are hesitant to apply this technology. There are two basic stumbling blocks: active magnetic bearings (AMBs) have little overload capacity, and failure of any portion of the AMB system could result in catastrophic damage to the machine. To cope with both of these problems, a secondary back-up bearing must be included in the system. This paper describes a new full scale, high speed test rig which has the capability to test a variety of back-up bearings at speeds of up to 35,000 RPM, and bearing loads of up to 6.7 kN. Preliminary data for two novel back-up bearings are presented as a demonstration of the test rig’s capabilities.

Design of High-Speed Rotor Systems with Gas-Magnetic Bearings

2021 ◽  
pp. 597-604
Author(s):  
Alexander V. Kosmynin ◽  
Vladimir S. Schetinin ◽  
Alexander S. Khvostikov ◽  
Aleksey V. Smirnov
Keyword(s):  
High Speed ◽  
Magnetic Bearings ◽  
Rotor Systems

Acoustic Emission in Structural Health Monitoring

2009 ◽  
Vol 413-414 ◽  
pp. 15-28 ◽  
Author(s):  
Karen M. Holford
Keyword(s):  
Acoustic Emission ◽  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Crack Detection ◽  
Current Role ◽  
Structural Health ◽  
Safety And Reliability ◽  
Critical Components ◽  
Insight Into

Structural Health Monitoring (SHM) is of paramount importance in an increasing number of applications, not only to ensure safety and reliability, but also to reduce NDT costs and to ensure timely maintenance of critical components. This paper overviews the modern applications of acoustic emission (AE), which has become established as a very powerful technique for monitoring damage in a variety of structures, and the new approaches that have enabled the successful application of the technique, leading to automated crack detection. Examples are drawn from a variety of industries to provide an insight into the current role of AE in structural health monitoring.

scholarly journals Application of the Subspace-Based Methods in Health Monitoring of Civil Structures: A Systematic Review and Meta-Analysis

2020 ◽  
Vol 10 (10) ◽  
pp. 3607
Author(s):  
Hoofar Shokravi ◽  
Hooman Shokravi ◽  
Norhisham Bakhary ◽  
Mahshid Heidarrezaei ◽  
Seyed Saeid Rahimian Koloor ◽  
...  
Keyword(s):  
System Identification ◽  
Systematic Reviews ◽  
Health Monitoring ◽  
Meta Analysis ◽  
Civil Structures ◽  
Literature Reviews ◽  
Research Gap ◽  
Meta Analyses ◽  
Subspace System Identification ◽  
Insight Into

A large number of research studies in structural health monitoring (SHM) have presented, extended, and used subspace system identification. However, there is a lack of research on systematic literature reviews and surveys of studies in this field. Therefore, the current study is undertaken to systematically review the literature published on the development and application of subspace system identification methods. In this regard, major databases in SHM, including Scopus, Google Scholar, and Web of Science, have been selected and preferred reporting items for systematic reviews and meta-analyses (PRISMA) has been applied to ensure complete and transparent reporting of systematic reviews. Along this line, the presented review addresses the available studies that employed subspace-based techniques in the vibration-based damage detection (VDD) of civil structures. The selected papers in this review were categorized into authors, publication year, name of journal, applied techniques, research objectives, research gap, proposed solutions and models, and findings. This study can assist practitioners and academicians for better condition assessment of structures and to gain insight into the literature.

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