Qualification shock testing has been completed for a new chilled water plant developed for the US Navy. The variable speed compressor at the heart of the chiller system includes a direct drive, high-speed permanent magnet (PM) motor, PM bias active magnetic bearings, and a backup bearing system. For MIL-S-901D shock certification, the chiller was mounted on a Navy floating shock platform (barge) and subjected to a standard sequence of four different shock impacts generated from high explosive charges from varying angles and standoff distances. The chiller was fully operational during three blasts and in standby mode for the fourth blast. In the standby mode, the shaft is de levitated and stationary on the backup bearings and the chiller secured. The backup bearing system of the motor absorbed the response to the shock impacts and the magnetic bearings subsequently recovered levitation as designed. The shock testing was simulated using a transient, nonlinear rotordynamic analysis including the magnetic bearing control and saturation features, backup bearings with resilient mounts and associated clearances, and structural dynamic models of the rotor and housing. Compressor/motor housing acceleration measured during the testing was used as the driving input into the simulation. Some rotor position data recorded during shock testing, the simulation approach and comparisons are reported and discussed.
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ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition
June 11–15, 2018
Oslo, Norway
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5114-2
PROCEEDINGS PAPER
Floating Shock Platform Testing of a Magnetic Bearing Supported Chiller Compressor: Measurements and Simulation Results
Lawrence Hawkins,
Lawrence Hawkins
Calnetix Technologies, Cerritos, CA
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Zhiyang Wang,
Zhiyang Wang
Calnetix Technologies, Cerritos, CA
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Koman Nambiar
Koman Nambiar
Johnson Controls Navy Systems, York, PA
Search for other works by this author on:
Lawrence Hawkins
Calnetix Technologies, Cerritos, CA
Zhiyang Wang
Calnetix Technologies, Cerritos, CA
Koman Nambiar
Johnson Controls Navy Systems, York, PA
Paper No:
GT2018-77031, V07BT34A042; 10 pages
Published Online:
August 30, 2018
Citation
Hawkins, L, Wang, Z, & Nambiar, K. "Floating Shock Platform Testing of a Magnetic Bearing Supported Chiller Compressor: Measurements and Simulation Results." Proceedings of the ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. Volume 7B: Structures and Dynamics. Oslo, Norway. June 11–15, 2018. V07BT34A042. ASME. https://doi.org/10.1115/GT2018-77031
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