ICONE11-36524 PRELIMINARY MODAL ANALYSIS AND STRUCTURE DESIGN OF AN HTR-10 PCU ROTOR WITH AN ACTIVE MAGNETIC BEARING

概要

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A 10MW high-temperature gas-cooled reactor (HTR-10) was constructed by INET at Tsinghua University of China. The second phase of the HTR-10 project is to set up a direct helium cycle to replace the current steam cycle. An Active Magnetic Bearing (AMB) was chosen to support the rotor. This rotor is vertically mounted to hold the turbine machine, compressors and the power generator together. The rotor's length is 7m, its weight is about 1000kg and the rotating speed is 15,000r/min. One of the challenging problems is to exceed natural frequencies with enough stability and safety during reactor start up, power change and shutdown. Some kinds of FEM software and methods, such as MSC. Marc, Ansys, and the Transfer Matrix Method, are compared to fully analyze rotor dynamics characteristic. The modal analysis and preliminary structure design have been done for the HTR-10 phase II rotor. MSC. Marc was finally selected to analyze the vibration mode and the natural frequency of the rotor. The effects of AMB stiffness on the critical speeds of the rotor were studied. These results offer the basis for design of the AMB control system, and also provide research data for large magnetic bearings.
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