Large Steam Turbine Vibration Resonance of Pedestal and Linkage System RCA, Detail Vibration Investigation/Measurement at Site and Countermeasures - (PPT)

摘要

1) Summary of analysis result: Pedestal Analyzed N·F Vibration level in operation Note Fabricated type (Original design) 61.8Hz (Hot condition) Maximum 30mm/s 0-P (H-direction) Almost same as site bump test (73Hz) with cold condition 69.2Hz. Casting type (Improved design) 40.7Hz Less than 1mm/s 0-P (H-direction) 17% separation margin against 48.8Hz (Min. speed) satisfied with API standard of more than 16% 2) 3D response analysis was carried out using field measurement data: - Analysis was confirmed root cause of site pedestal vibration. - Analysis model used to design new bearing pedestal, and confirmed the expected vibration include separation margin. - Improved bearing pedestal retrofit to similar machines. - Field record verified the improved vibration response analysis.