Shock Analysis for a Homopolar, Permanent Magnet Bias Magnetic Bearing System

Hawkins, Lawrence A.

doi:10.1115/97-gt-230

Cited by 7 publications

(8 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…KIrk [3] presented a detailed nonlinear analysis for a rotor dropped into backup bearings. Hawkins [4] developed a rotordynarnic simulation that included a nonlinear magnetic bearing saturation model as well nonlinear backup bearing clearance effects to analyze shock response in a magnetic bearing system. Cuesta [5] presented an analysis that included a kinematic impact model and compared the predictions to test data on a small test rig.…”

Section: Introductionmentioning

confidence: 99%

Test Results and Analytical Predictions for Rotor Drop Testing of an Active Magnetic Bearing Expander/Generator

Hawkins¹,

Filatov²,

Imani³

et al. 2006

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

A cryogenic gas expander system that incorporates a high-performance, high-speed permanent magnet, direct-drive generator and low loss magnetic bearings is described. Flow loop testing to 30,000rpm was completed at the system manufacturer’s facility in January 2005, and field installation is scheduled for October 2005. As part of the system testing, the rotor was dropped onto the backup bearings multiple times at an intermediate speed and at 30,000rpm. Orbit and time-history data from a full speed drop and spin down are presented and discussed in detail. A transient, nonlinear rotordynamic analysis simulation model was developed for the machine to provide insight into the dynamic behavior. The model includes the dead band clearance, the flexible backup bearing support, and hard stop. Model predictions are discussed relative to the test data.

show abstract

Section: Introductionmentioning

confidence: 99%

Test Results and Analytical Predictions for Rotor Drop Testing of an Active Magnetic Bearing Expander/Generator

Hawkins¹,

Filatov²,

Imani³

et al. 2006

Journal of Engineering for Gas Turbines and Power

View full text Add to dashboard Cite

show abstract

“…The simulation was performed using an analysis tool previously described [4]. In this analysis, the rotordynamic equations of motion for a coupled rotor/casing system represented in second order form are:…”

Section: Nonlinear Rotor Drop Simulationmentioning

confidence: 99%

“…Kirk [3] presented a detailed nonlinear analysis for a rotor dropped into backup bearings. Hawkins [4] developed a rotordynamic simulation that included a nonlinear magnetic bearing saturation model as well nonlinear backup bearing clearance effects to analyze shock response in a magnetic bearing system. Cuesta [5] presented a analysis that included a kinematic impact model and compared the predictions to test data on a small test rig.…”

Section: Introductionmentioning

confidence: 99%

Test Results and Analytical Predictions for Rotor Drop Testing of an AMB Expander/Generator

Hawkins¹,

Filatov²,

Imani³

et al. 2006

Volume 5: Marine; Microturbines and Small Turbomachinery; Oil and Gas Applications; Structures and Dynamics, Parts a and B

View full text Add to dashboard Cite

A cryogenic gas expander system that incorporates a high performance, high-speed permanent magnet, direct-drive generator and low loss magnetic bearings is described. Flow loop testing to 30,000 rpm was completed at the system manufacturer's facility in January 2005, and field installation is scheduled for October 2005. As part of the system testing, the rotor was dropped onto the backup bearings multiple times at an intermediate speed and at 30,000 rpm. Orbit and timehistory data from a full speed drop and spin down are presented and discussed in detail. A transient, nonlinear rotordynamic analysis simulation model was developed for the machine to provide insight into the dynamic behavior. The model includes the dead band clearance, the flexible backup bearing support and hard stop. Model predictions are discussed relative to the test data.

show abstract

“…Hawkins [4] also investigated the effects of base excitation on a rotor supported by AMBs. This paper outlines the analysis of an entire gas turbine system undergoing a shock test to the base of the system.…”

Section: Introductionmentioning

confidence: 98%

Effect of sinusoidal base motion on a magnetic bearing

Kasarda

Clements

Wicks

et al.

Proceedings of the 2000. IEEE International Conference on Control Applications. Conference Proceedings (Cat. No.00CH37162)

View full text Add to dashboard Cite

Many of the proposed applications for magnetic bearings involve their use in moving vehicles. These include flywheels for energy storage in terrestrial applications, such as buses and trains, and also in space-based applications, such as satellites. Most of the existing research literature on magnetic bearings is for static systems where the base is stationary. For vehicular applications, magnetic bearings will be subject to base motion that will have significant effects on the dynamics. In addition, magnetic bearings designed for vehicle use are expected to be power-limited, which leads to decreased stiffness and damping. The implications of these effects on the design of active magnetic bearing systems are significant but have not been fully investigated. In order to address the base motion scenario, a small non-rotating test rig with a single magnetic bearing mounted on a shaker has been built and tested to study the effect of sinusoidal base motion on the magnetic bearing's ability to support a target mass. The tests include base excitation of the system at different frequencies and amplitudes including the natural frequency of the system. Results from this test rig for three cases of bearing stiffness and damping properties are presented. Test results show both linear and non-linear behavior for the cases of bearing stifmess and damping tested. The tests also demonstrate the implications associated with the requested level of stiffness and damping on limiting the operating performance range of the magnetic bearing undergoing sinusoidal base motion.

show abstract

Shock Analysis for a Homopolar, Permanent Magnet Bias Magnetic Bearing System

Cited by 7 publications

References 1 publication

Test Results and Analytical Predictions for Rotor Drop Testing of an Active Magnetic Bearing Expander/Generator

Test Results and Analytical Predictions for Rotor Drop Testing of an Active Magnetic Bearing Expander/Generator

Test Results and Analytical Predictions for Rotor Drop Testing of an AMB Expander/Generator

Effect of sinusoidal base motion on a magnetic bearing

Contact Info

Product

Resources

About