Active Magnetic Bearings for the Identification and Fault Diagnosis in Turbomachinery

Aenis, Martin; Knopf, Eric; Nordmann, Rainer

doi:10.1016/s1474-6670(17)39290-x

Cited by 12 publications

(18 citation statements)

References 1 publication

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“…As mentioned earlier the force from the AMBs can in general be determined based on either Hall sensor signals or current/air gap measurements [40]. Both methods require calibration to yield precise force estimations.…”

Section: Hall Sensor Calibration Methodologymentioning

confidence: 99%

“…This method is referred to as the (i − s) methodology in the literature [39]. However, it has been shown that higher force estimation precision can be achieved by employing Hall sensors mounted in the pole surface areas of the AMBs [40,41] as compared to the (i − s) method. Additionally, low force estimation errors have been reported using fiber optic strain gauges [42][43][44], giving merit to a continued research effort.…”

Section: Baseline Functionality Considerations For the Test Facility mentioning

confidence: 99%

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Design and Calibration of a Full Scale Active Magnetic Bearing Based Test Facility for Investigating Rotordynamic Properties of Turbomachinery Seals in Multiphase Flow

Voigt

Mandrup-Poulsen

Nielsen³

et al. 2017

Journal of Engineering for Gas Turbines and Power

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The recent move toward subsea oil and gas production brings about a requirement to locate process equipment in deepwater installations. Furthermore, there is a drive toward omitting well stream separation functionality, as this adds complexity and cost to the subsea installation. This in turn leads to technical challenges for the subsea installed pumps and compressors that are now required to handle multiphase flow of varying gas to liquid ratios. This highlights the necessity for a strong research focus on multiphase flow impact on rotordynamic properties and thereby operational stability of the subsea installed rotating machinery. It is well known that careful design of turbomachinery seals, such as interstage and balance piston seals, is pivotal for the performance of pumps and compressors. Consequently, the ability to predict the complex interaction between fluid dynamics and rotordynamics within these seals is key. Numerical tools offering predictive capabilities for turbomachinery seals in multiphase flow are currently being developed and refined, however the lack of experimental data for multiphase seals renders benchmarking and validation impossible. To this end, the Technical University of Denmark and Lloyd's Register Consulting are currently establishing a purpose built state of the art multiphase seal test facility, which is divided into three modules. Module I consists of a full scale active magnetic bearing (AMB) based rotordynamic test bench. The internally designed custom AMBs are equipped with an embedded Hall sensor system enabling high-precision noncontact seal force quantification. Module II is a fully automatized calibration facility for the Hall sensor based force quantification system. Module III consists of the test seal housing assembly. This paper provides details on the design of the novel test facility and the calibration of the Hall sensor system employed to measure AMB forces. Calibration and validation results are presented, along with an uncertainty analysis on the force quantification capabilities.

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Section: Hall Sensor Calibration Methodologymentioning

confidence: 99%

Section: Baseline Functionality Considerations For the Test Facility mentioning

confidence: 99%

Design and Calibration of a Full Scale Active Magnetic Bearing Based Test Facility for Investigating Rotordynamic Properties of Turbomachinery Seals in Multiphase Flow

Voigt

Mandrup-Poulsen

Nielsen³

et al. 2017

Journal of Engineering for Gas Turbines and Power

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“…Active Magnetic Bearings (AMB) have been successfully applied in industrial applications [1]. They are well suited for contactless operations such as actuators and sensors in rotating machinery [2][3][4][5]. AMB technology in conjunction with conventional bearings is utilized either as an active magnetic damper [6], or as an instability controller for certain supports such as journal bearings [7,8].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Identification of Electromagnetic Actuator for the Control of Rotating Machinery

Morais

Hagopian

Steffen

et al. 2013

Shock and Vibration

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This work deals with the design and the assessment of electromagnetic actuators (EMAs) for the control of rotating machines. The system studied has a hybrid bearing that exhibits nonlinear behavior. The system is composed of a horizontal flexible shaft supported by two ball bearings at one end and a roller bearing that is located in a squirrel cage at the other end. Four identical EMAs supplied with constant current are utilized. The EMAs associated to the squirrel cage constitutes the hybrid bearing. The aim is to develop a strategy in order to define and to identify a reliable model necessary for the control of rotating machinery in the presence of localized non-linearity. The identification strategy consists in modeling the system with as many sub-models as needed that are identified separately. This enables obtaining a straightforward modeling of rotating machinery even in the case in which system components are frequency or time dependent. For the system studied, two sub-models were necessary. First the EMAs were modeled by using classical equations of electromagnetism and then identified experimentally. Then, a linear model of the shaft mounted on its bearings was defined by using the finite element method and was identified successfully. The model of the system was adjusted after assembling the different identified sub-models. The identification is carried out by using a pseudo-random search algorithm. The model of the system is then assessed for different configurations. The results obtained demonstrate the effectiveness of the developed strategy.

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“…Their main advantages are contact-less working environments, no sealing constraints, frictionless suspension, and their capacity to operate in active systems. They are well-suited for contactless operation as actuators and sensors in rotating machinery (Kulesza 2010, Lei 2008, Kasarda 2007, Mani 2006, Aenis 2002, Kasarda 2004). AMB devices in conjunction with conventional support bearings are utilized either as active magnetic dampers (Souza 2010), or for controlling the instability (El-Shafei 2007, Souza 2009.…”

Section: Introductionmentioning

confidence: 99%

Investigations on critical speed suppressing by using electromagnetic actuators

Mahfoud¹,

Hagopian²

2012

Smart Structures and Systems

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The possibility of suppressing critical speeds by using electromagnetic actuators (EMAs) is assessed experimentally in this paper. The system studied is composed of a horizontal flexible shaft supported by two ball bearings at one end and one roller bearing that is located in a squirrel cage at the other end. Four identical EMAs supplied with constant current are utilized. The EMAs associated to the squirrel cage constitutes the hybrid bearing. Results obtained, show that the constant current, when applied to the EMAs, produces a shift of the first critical speed toward lower values. Moreover, the application of constant current for a speed interval around the critical speed enables a smooth run-up or run-down without crossing any resonance.

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Active Magnetic Bearings for the Identification and Fault Diagnosis in Turbomachinery

Cited by 12 publications

References 1 publication

Design and Calibration of a Full Scale Active Magnetic Bearing Based Test Facility for Investigating Rotordynamic Properties of Turbomachinery Seals in Multiphase Flow

Design and Calibration of a Full Scale Active Magnetic Bearing Based Test Facility for Investigating Rotordynamic Properties of Turbomachinery Seals in Multiphase Flow

Modeling and Identification of Electromagnetic Actuator for the Control of Rotating Machinery

Investigations on critical speed suppressing by using electromagnetic actuators

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